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  • 1.
    Anwar, Muhammad Waseem
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Shuaib, M. T. B.
    Department of Computer and Software Engineering, College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
    Azam, F.
    Department of Computer and Software Engineering, College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
    Safdar, A.
    Department of Computer and Software Engineering, College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
    A Model-Driven Framework for Design and Analysis of Vehicle Suspension Systems2022In: Communications in Computer and Information Science, Springer Science and Business Media Deutschland GmbH , 2022, p. 197-208Conference paper (Refereed)
    Abstract [en]

    The design and implementation of vehicle suspension systems is complex and time-consuming process that usually leads to production delays. Although different Model Driven Engineering (MDE) technologies like EAST-ADL/AUTOSAR are frequently applied to expedite vehicle development process, a framework particularly dealing with design and analysis of vehicle suspension is hard to find in literature. This rises the need of a framework that not only supports the analysis of suspension system at higher abstraction level but also complements the existing standards like EAST-ADL. In this article, a Model driven framework for Vehicle Suspension System (MVSS) is proposed. Particularly, a meta-model containing major vehicle suspension aspects is introduced. Subsequently, a modeling editor is developed using Eclipse Sirius platform. This allows the modeling of both simple as well as complex vehicle suspension systems with simplicity. Moreover, Object Constraint Language (OCL) is utilized to perform early system analysis in modeling phase. Furthermore, the target MATLAB-Simulink models are generated from source models, using model-to-text transformations, to perform advanced system analysis. The application of proposed framework is demonstrated through real life Audi A6L Hydraulic active suspension use case. The initial results indicate that proposed framework is highly effective for the design and analysis of vehicle suspension systems. In addition to this, the analysis results could be propagated to EAST-ADL toolchains to support full vehicle development workflow. 

  • 2.
    Avén, Joakim
    Mälardalen University, School of Innovation, Design and Engineering.
    Analysis of the Z-wing configuration2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis will analyze the Z-wing configuration. The Z-wing configuration is basically an airplane that has one of the wings placed at the forward section of the fuselage and the other wing placed on the other side far aft at the fuselage.

    This configuration creates a lot of different and unwanted forces and moments due to a differential in lift and drag between both the wings and the main objective with this thesis is to get a Z-wing to fly straight and level flight without these strange and unwanted forces and moments over it.

    Therefore the contribution of the wings different parameters to different moments and forces have been mapped out. Parameters such as the angle of incidence, wing span, dihedral, placement of wings etc.

    All the calculations done regarding the aerodynamic forces on the Z-wing have been performed in the Tornado, which is a program that runs in MATLAB and uses Vortex Lattice Method for its calculations.

    The outcome was that a steady level flight was possible. The configuration does have a lot of disadvantages. It will be very difficult to control in pitch, yaw and roll, although a backwards sweep of the front wing and a backwards sweep of the aft wing made roll control much better.

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    FULLTEXT01
  • 3.
    Axelsson, Jakob
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Safety in Vehicle Platooning: A Systematic Literature Review2017In: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 18, no 5, p. 1033-1045Article, review/survey (Refereed)
    Abstract [en]

    Vehicle platooning has been studied for several decades, with objectives such as improved traffic throughput on existing infrastructure or reduced energy consumption. All the time, it has been apparent that safety is an important issue. However, there are no comprehensive analyses of what is needed to achieve safety in platooning, but only scattered pieces of information. This paper investigates, through a systematic literature review, what is known about safety for platooning, including what analysis methods have been used, what hazards and failures have been identified, and solution elements that have been proposed to improve safety. Based on this, a gap analysis is performed to identify outstanding questions that need to be addressed in future research. These include dealing with a business ecosystem of actors that cooperate and compete around platooning, refining safety analysis methods to make them suitable for systems-of-systems, dealing with variability in vehicles, and finding solutions to various human factors issues.

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  • 4.
    Barua, Arnab
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Ahmed, Mobyen Uddin
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Begum, Shahina
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Multi-scale Data Fusion and Machine Learning for Vehicle Manoeuvre Classification2023In: ICSET 2023 - 2023 IEEE 13th International Conference on System Engineering and Technology, Proceeding, Institute of Electrical and Electronics Engineers Inc. , 2023, p. 296-301Conference paper (Refereed)
    Abstract [en]

    Vehicle manoeuvre analysis is vital for road safety as it helps understand driver behaviour, traffic flow, and road conditions. However, classifying data from in-vehicle acquisition systems or simulators for manoeuvre recognition is complex, requiring data fusion and machine learning (ML) algorithms. This paper proposes a hybrid approach that combines multivariate multiscale entropy (MMSE) and one-dimensional convolutional neural networks (1D-CNNs). MMSE is utilised for early feature extraction and data fusion, and the extracted features are classified using 1D-CNNs, achieving an impressive 87% test accuracy in multiclass classification. This paper provides insights into improving vehicle manoeuvre classification using advanced ML techniques and data fusion methods to handle complex data sets effectively. Ultimately, this approach can enhance the understanding of driver behaviour, inform policy decisions, and develop more effective strategies to enhance road safety. 

  • 5.
    Berglund, Tobias
    Mälardalen University, Department of Mathematics and Physics.
    Evaluation of Fuel Saving for an Airline2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    A study of which methods and measures that can be used to reduce fuel consumption and harmful discharges in an airline.

    The study begins with an investigation containing calculations of the differences between estimated fuel consumption calculated by a computer program called Skytrack and actual fuel consumption. Results from this study allows synchronization between actual consumption with calculated consumption. In addition to this methods and configurations to reduce weight and thus weight onboard aircrafts e.g. carpet exchange, lightweight trolleys and water reduction has been created and analysed.

    To bring the thesis to an end, the author has investigated other methods and configurations which TUIfly Nordic is implementing for fuel conservation.

    The thesis results in several conceivable areas for fuel conservation with calculated savings of 830 000 EUR which for the moment is implemented in TUIFly Nordic.

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    FULLTEXT01
  • 6.
    Bergman, David
    Mälardalen University, School of Innovation, Design and Engineering.
    Modelling & implementation of Aerodynamic Zero-lift Drag into ADAPDT2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The objective of this thesis work was to construct and implement an algorithm into the programADAPDT to calculate the zero-lift drag profile for defined aircraft geometries. ADAPDT, shortfor AeroDynamic Analysis and Preliminary Design Tool, is a program that calculates forces andmoments about a flat plate geometry based on potential flow theory. Zero-lift drag will becalculated by means of different hand-book methods found suitable for the objective andapplicable to the geometry definition that ADAPDT utilizes.

    Drag has two main sources of origin: friction and pressure distribution, all drag acting on theaircraft can be traced back to one of these two physical phenomena. In aviation drag is dividedinto induced drag that depends on the lift produced and zero-lift drag that depends on the geometry of the aircraft.

    How reliable and accurate the zero-lift drag computations are depends on the geometry data thatcan be extracted and used. ADAPDT‟s geometry definition is limited to flat plate geometrieshowever although simple it has the potential to provide a huge amount of data and also delivergood results for the intended use. The flat plate representation of the geometry proved to beleast sufficient for the body while wing elements could be described with much more accuracy.

    Different empirical hand-book methods were used to create the zero-lift drag algorithm. Whenchoosing equations and formulas, great care had to be taken as to what input was required sothat ADAPDT could provide the corresponding output. At the same time the equations shouldnot be so basic that level of accuracy would be compromised beyond what should be expectedfrom the intended use.

    Finally, four well known aircraft configurations, with available zero-lift drag data, weremodeled with ADAPDT‟s flat plate geometry in order to validate, verify and evaluate the zeroliftdrag algorithm‟s magnitude of reliability. The results for conventional aircraft geometriesprovided a relative error within 0-15 % of the reference data given in the speed range of zero toMach 1.2. While for an aircraft with more complicated body geometry the error could go up to40 % in the same speed regime. But even though the limited geometry is grounds foruncertainties the final product provides ADAPDT with very good zero-lift drag estimationcapability earlier not available. A capability that overtime as ADAPDT continues to evolve hasthe potential to further develop in terms of improved accuracy.

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  • 7.
    Bergman, Niklas
    Mälardalen University, School of Innovation, Design and Engineering.
    Effects of Mach cruise number on conventional civil jet aircraft sizing2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis work was executed at Swift Engineering Incorporated located in San Clemente, California during spring in 2009. Placement supervisor from Swift was Mark Page and advisor and examiner from the Division of future products at Mälardalen University, Sweden was Gustaf Enebog.

    The objective with this thesis work was to examine the effects of fitness ratio, lift over drag, lift coefficient at cruise, winglet span, wing sweep angle, wing aspect ratio, wing area and weights with respect to Mach number for a conventional business jet capable of 18 passengers. The cruise speed study range from Mach 0.88 to 0.99.

    The Excel based conceptual design tool Jetsizer 2008c was used to make four models with similar configuration and mission but with different cruise Mach numbers.

    A new Jetsizer module was then created to handle a modification process where the models are optimized for their speed and configuration. The result in this report gives guidelines for the needed values when creating an initial CFD model for this type of airplane.

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    FULLTEXT01
  • 8.
    Bernström, David
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Nyström, Erik
    Mälardalen University, School of Innovation, Design and Engineering.
    RECOMMENDATIONS FOR A DEPENDABLE ROV SYSTEM FOR SWEDISH MARITIME RESEARCH2023Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A Remotely Operated underwater Vehicle (ROV) faces many problems regarding dependability and most issues come during launch and recovery. The thesis looks at finding what dependability aspects shall be considered when developing a modular ROV to come up with recommendations for a system, together with a more reliable method of launching and recovering ROV’s. The area is important since it has been shown that there exists a gap in the market regarding multipurpose and dependable ROV’s. The method used in the thesis is a case study starting with a literature study to get a solid foundation to be able to conduct interviews. The interviews were structured as a semi-structured interview and the data were used to be able to find the important dependability aspects to give out a recommendation of a ROV system. The result shows the different dependability aspects that should be emphasised to ensure a safe system: Reliability, safety, confidentiality, maintainability, availability and integrity. From the recommendation, a simulation was conducted to test the stabilizing force to increase the reliability of launch and recovery. Furthermore, the different tests show that the amount of motion can be lowered by using thruster force as well as adding weight to the system. From the results it can be determined that the use of tether tension as a stabilizing factor is possible by using Dynamic Positioning (DP) to control the ROV’s thrusters to increase reliability.

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  • 9.
    Boman, David
    Mälardalen University, School of Innovation, Design and Engineering.
    Implementation of UAV design into CAD2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    ABSTRACT

    This work has been focused on implementing, into CAD (Solid Works), a UAV-design by Enebog. The design has been given to the author on meetings and mail. A “living” document with design parameters was updated from both sides continuously throughout the project. The measurements/dimensions of the aircraft were discussed as well as how to implement in CAD. All updates were also continuously updated in the document. The UAV is built up as an assembly in CAD, with sub-assemblies and parts. The parts are designed with the standard work bench in Solid Works and mated together to form an aircraft. Center of gravity and mass properties of the parts were calculated in Solid Works and exported to Excel for the purpose of presenting the data.

    The result is 7 2D drawings attached to a 3D model. The aircraft has a wing span of 2,7 meters (8,68 ft), with a corresponding wing area of 0,91 m2 (9,8 ft2). The total length is dimensioned to 1,87 m (6,14 ft) and the total mass is calculated to 8,68 kg (19,14 lbs), which is also the aircrafts takeoff weight. The aircraft is designed to be built with two composite materials; carbon fiber/epoxy and glass fiber/epoxy. In the drawing material plan views with dimensions of the aircraft, detail views of e.g. the nose pod in the front part of the aircraft, an exploded view with a corresponding build of material-table was generated.

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  • 10.
    Brander, Kristoffer
    Mälardalen University, School of Innovation, Design and Engineering.
    Förbättrad saverringsdesign för dieselmotor2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A diesel engine in operation continuously generate small amounts of deposits, which then can form a hard carbon based buildup called coke. The coke is formed in contact with surfaces with high temperature, one of which is the piston top land. When the buildup is thick enough it reaches the inside of the cylinder where it creates friction and thereby polishes the surface. This has a negative effect on the properties of the surface, while it in addition creates an irregular diameter of the cylinder. Oil consumption also increases when oil on the inside of the cylinder is pushed upwards to the combustion chamber by the buildup. To solve this problem Scania introduced an anti-polishing ring. This is located in a seat at the top of the cylinder, at the same height as top dead center on the piston top land. By having a smaller inner diameter than the cylinder, the anti-polishing ring is able to scrape off coke on top land before it reaches the cylinder wall.

    The aim of this thesis carried out at Scania is to improve the anti-polishing ring design by mainly reducing crevice volumes caused by it. The crevice volumes primarily increase fuel consumption and should therefore be avoided. Alternatives to the anti-polishing ring are also to be documented.

    The anti-polishing ring was divided into sub features, where every feature was examined to reduce the amount of crevice volume that it causes. Function, crevice volume, robustness and cost was taken into consideration when designing a new anti-polishing ring. Continuous contact with the manufacturer ensured that changes being made were still possible to manufacture. If the existing symmetry of the anti-polishing ring is changed, a means to guarantee that the ring is always assembled correctly needs to be implemented. Several suggestions where compared to find the best solution to the problem.

    An improved design of the anti-polishing ring is suggested that reduces the crevice volumes by 56,4 % and thereby the fuel consumption by approximately 0,125 %. The conclusion is that the anti-polishing ring is the most effective solution and that the design proposed improves it furthermore.

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  • 11.
    Cederbladh, Johan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Reale, A.
    Dynatrace, Klagenfurt, Austria.
    Bergsten, A.
    Alstom, Västerås, Sweden.
    Mikelov, R.
    Saab Aeronautics, Linköping, Sweden.
    Cicchetti, Antonio
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Barriers for Adopting FMI-Based Co-Simulation in Industrial MBSE Processes2023In: Proceedings - 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion, MODELS-C 2023, Institute of Electrical and Electronics Engineers Inc. , 2023, p. 510-519Conference paper (Refereed)
    Abstract [en]

    Model-Based Systems Engineering (MBSE) is a growing paradigm for system development where models are the primary considered artefacts. However, MBSE often relies on semi-formal modelling languages and methods, limiting analytical capabilities. Co-Simulation is argued in the literature to be a promising technology in the simulation domain for integrating heterogeneous models in unified simulations. The most commonly used standard for Co-Simulation is currently the Functional-Mockup-Interface (FMI), supported by many tools in the industry. Recently there has been increasing interest in utilizing co-simulation in MBSE processes to enable simulation capabilities earlier in development, mainly via instantiating simulations using the FMI standard from system architecture views. This paper briefly argues the case for co-simulation for industrial MBSE and presents several barriers to integration from a holistic point of view. The paper highlights the need for further research and progress to improve the maturity of the industrial adoption for MBSE workflows while discussing the current outlook for FMI-based co-simulation orchestrated from architecture models. 

  • 12.
    Chadda, Tommy
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Berg, Johannes
    Mälardalen University, School of Innovation, Design and Engineering.
    Methods for Failure Analysis Data within Databases and Aids2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In an advanced avionics system, the demand of high reliability and availability is of great importance. Testability Analysis is a method of examining this. In the project RWE Tornado GE at Saab Avitronics, they use Built-In Test (BIT), for the purpose of detecting and isolating possible failures in the equipment in question. There is however the need of verification of BIT functionality. Some of the verification tests are requested by customer EADS to be simulated and demonstrated. The objective of this thesis is to understand the Testability Analysis process as well as develop a tool to assist the Testability Demonstration preparations and result recording.

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    Methods for Failure Analysis Data
  • 13.
    Edkvist, Markus
    Mälardalen University, School of Innovation, Design and Engineering.
    Genomgång av A-checkupplägg till Dash 8 Q4002015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report I summarize the thesis, which is about to check what will happen if you decide to increase the interval between the a-checks, carried out on the Norwegian airline Widerøe. They want to know if an increase in time between the checks can give them an opportunity of increasing their aircraft fleet. In the current situation Widerøe has 11  Dash 8 Q400 and can consider a possible increase of 3 planes. This would be done without the need to increase accessibility of the hangars and increase in staff.

    What determines how often a check is performed is the maintenance tasks which has the shortest maintenance interval. On the Dash 8 the shortest interval is 600 flight hours. Therefore, a check must be performed once every 600 flight hour.

    But since there is so many maintenance tasks that will be performed at every check point, Widerøe have decided to divide their checks. They do this by dividing every check-package into four smaller packages. With this layout they get a breakdown of 150 flight hours instead of 600, and so you get less time between maintenance and fewer maintenance tasks at each occasion.

    My work started by developing a new checking package of 600 flight hours of interval. I did this by merging the existing check-package of 150 flight hour intervals into a checking package with 600-hour intervals. After that, it took considerable amount of work to define the differences between the various check packages. I started to count on whether you saved or not saved time by lengthening the interval. After that I optimized the number of technicians needed at each check and then calculated the total time required for each check.

    In the end I came up with two possible solutions. The first option is to use my check program with 600 flight hours of interval, and then increase the fleet with two aircrafts. The second option is to use a checking program with 300 flight hours of interval and then increase the fleet with one aircraft.

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  • 14.
    Ferreira, Klas
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Jeleborg, Douglas
    Mälardalen University, School of Innovation, Design and Engineering.
    Anpassning och optimering av checkprogram för AW1392015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Presently Sjöfartsverket do their maintenance according to a standard program, which means that every maintenance task will be done when the task limit occurs. This leads to a very long downtime for the aircraft in some occasions and very short downtime in others. The goal with this work is to reach a higher regularity of the aircraft operation. To reach a higher regularity for the operational needs, this work will present a hypothetic better maintenance concept for Swedish Maritime Administration. The concept is based on equalized maintenance structure, which means that every maintenance occasions are meant to take the same time to perform. This result will lead to easier planning and better maintenance overview of the aircraft operation. Different types of results have been presented depending on the size of the check cycle or if the engineering unit at the helicopter organization is going to use a reliability program in the future or not. Two with different types of check cycles and one, which can be considered as a future goal when a potential reliability program is in use.  

     

    The work of the equalized maintenance structure takes airworthiness limitation tasks in consideration and put them as “drop outs” besides the check cycle itself because of the high criticality in those items.

    Excel has been used to store and sort all the maintenance tasks, which are considered in this work, and pivot tables have been used to get an overview of the number of tasks in each interval. An aircraft reliability program has been suggested in the future due to the changes in escalation of intervals gives Sjöfartsverket the opportunity to optimize their equalized structure even further with less reduction of task intervals, a better task spread out and higher operational safety.

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  • 15.
    Foskolos, Georgios
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Measurement-based current-harmonics modeling of aggregated electric-vehicle loads using power-exponential functions2020In: World Electric Vehicle Journal, E-ISSN 2032-6653, Vol. 11, no 3, article id 51Article in journal (Refereed)
    Abstract [en]

    This paper presents an aggregate current-harmonic load model using power exponential functions and built from actual measurement data during the individual charging of four dierent fully electric vehicles. The model is based on individual emitted current harmonics as a function of state of charge (SOC), and was used to deterministically simulate the simultaneous charging of six vehicles fed from the same bus. The aggregation of current harmonics up to the 11th was simulated in order to find the circumstances when maximal current-harmonic magnitude occurs, and the phase-angle location. The number of possible identical vehicles was set to four, while battery SOC, the start of charging, and the kind of vehicle were randomized. The results are presented in tables, graphs, and polar plots. Even though simulations did not consider the surrounding harmonics, supply-voltage variation, or network impedance, this paper presents an innovative modeling approach that gives valuable information on the individual current-harmonic contribution of aggregated electric-vehicle loads. With the future implementation of vehicle-to-grid technology, this way of modeling presents new opportunities to predict the harmonic outcome of multiple electric vehicles charging. 

  • 16.
    Giorgi, Andrea
    et al.
    Sapienza Univ Rome, Dept Anat Histol Forens & Orthopaed Sci, Rome, Italy.;BrainSigns SRL, Rome, Italy..
    Ronca, Vincenzo
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Comp Control & Management Engn, Rome, Italy..
    Vozzi, Alessia
    Sapienza Univ Rome, Dept Anat Histol Forens & Orthopaed Sci, Rome, Italy.;BrainSigns SRL, Rome, Italy..
    Arico, Pietro
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Comp Control & Management Engn, Rome, Italy..
    Borghini, Gianluca
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy..
    Capotorto, Rossella
    Sapienza Univ Rome, Dept Comp Control & Management Engn, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy..
    Tamborra, Luca
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy..
    Simonetti, Ilaria
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy..
    Sportiello, Simone
    Roma Tre Univ, Dept Civil Engn Comp Sci & Aeronaut Technol, Rome, Italy.;Univ Roma Tor Vergata, Dept Enterprise Engn, Rome, Italy..
    Petrelli, Marco
    Roma Tre Univ, Dept Civil Engn Comp Sci & Aeronaut Technol, Rome, Italy..
    Polidori, Carlo
    Italian Assoc Rd Safety Profess AIPSS, Rome, Italy..
    Varga, Rodrigo
    Inst Tecnol Castilla & Leon, Burgos, Spain..
    van Gasteren, Marteyn
    Inst Tecnol Castilla & Leon, Burgos, Spain..
    Barua, Arnab
    Malardalens Univ, Acad Innovat Design & Technol, Vasteras, Sweden..
    Ahmed, Mobyen Uddin
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Babiloni, Fabio
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy.;Hangzhou Dianzi Univ, Coll Comp Sci & Technol, Hangzhou, Peoples R China..
    Di Flumeri, Gianluca
    BrainSigns SRL, Rome, Italy.;Sapienza Univ Rome, Dept Mol Med, Lab Ind Neurosci, Rome, Italy..
    Neurophysiological mental fatigue assessment for developing user-centered Artificial Intelligence as a solution for autonomous driving2023In: Frontiers in Neurorobotics, ISSN 1662-5218, Vol. 17, article id 1240933Article in journal (Refereed)
    Abstract [en]

    The human factor plays a key role in the automotive field since most accidents are due to drivers' unsafe and risky behaviors. The industry is now pursuing two main solutions to deal with this concern: in the short term, there is the development of systems monitoring drivers' psychophysical states, such as inattention and fatigue, and in the medium-long term, there is the development of fully autonomous driving. This second solution is promoted by recent technological progress in terms of Artificial Intelligence and sensing systems aimed at making vehicles more and more accurately aware of their "surroundings." However, even with an autonomous vehicle, the driver should be able to take control of the vehicle when needed, especially during the current transition from the lower (SAE < 3) to the highest level (SAE = 5) of autonomous driving. In this scenario, the vehicle has to be aware not only of its "surroundings" but also of the driver's psychophysical state, i.e., a user-centered Artificial Intelligence. The neurophysiological approach is one the most effective in detecting improper mental states. This is particularly true if considering that the more automatic the driving will be, the less available the vehicular data related to the driver's driving style. The present study aimed at employing a holistic approach, considering simultaneously several neurophysiological parameters, in particular, electroencephalographic, electrooculographic, photopletismographic, and electrodermal activity data to assess the driver's mental fatigue in real time and to detect the onset of fatigue increasing. This would ideally work as an information/trigger channel for the vehicle AI. In all, 26 professional drivers were engaged in a 45-min-lasting realistic driving task in simulated conditions, during which the previously listed biosignals were recorded. Behavioral (reaction times) and subjective measures were also collected to validate the experimental design and to support the neurophysiological results discussion. Results showed that the most sensitive and timely parameters were those related to brain activity. To a lesser extent, those related to ocular parameters were also sensitive to the onset of mental fatigue, but with a delayed effect. The other investigated parameters did not significantly change during the experimental session.

  • 17.
    Gorospe, Joseba
    et al.
    Mondragon Unibertsitatea, Spain.
    Hasan, Shahriar
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Islam, Mir Riyanul
    Mälardalen University, School of Innovation, Design and Engineering.
    Gomez, Arrate Alonso
    Mondragon Unibertsitatea, Spain.
    Girs, Svetlana
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Uhlemann, Elisabeth
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Analyzing Inter-Vehicle Collision Predictions during Emergency Braking with Automated Vehicles2023In: International Conference on Wireless and Mobile Computing, Networking and Communications, IEEE Computer Society , 2023, Vol. 2023-June, p. 411-418Conference paper (Refereed)
    Abstract [en]

    Automated Vehicles (AVs) require sensing and perception to integrate data from multiple sources, such as cameras, lidars, and radars, to operate safely and efficiently. Collaborative sensing through wireless vehicular communications can enhance this process. However, failures in sensors and communication systems may require the vehicle to perform a safe stop or emergency braking when encountering hazards. By identifying the conditions for being able to perform emergency braking without collisions, better automation models that also consider communications need to be developed. Hence, we propose to employ Machine Learning (ML) to predict inter-vehicle collisions during emergency braking by utilizing a comprehensive dataset that has been prepared through rigorous simulations. Using simulations and data-driven modeling has several advantages over physics-based models in this case, as it, e.g., enables us to provide a dataset with varying vehicle kinematic parameters, traffic density, network load, vehicle automation controller parameters, and more. To further establish the conditions for inter-vehicle collisions, we analyze the predictions made through interpretable ML models and rank the features that contribute to collisions. We also extract human-interpretable rules that can establish the conditions leading to collisions between AVs during emergency braking. Finally, we plot the decision boundaries between different input features to separate the collision and non-collision classes and demonstrate the safe region of emergency braking.

  • 18.
    Hasan, Shahriar
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Gorospe, Joseba
    Mondragon Unibertsitatea, Elect & Comp Sci Dept, Arrasate Mondragon, Spain..
    Gomez, Arrate Alonso
    Mondragon Unibertsitatea, Elect & Comp Sci Dept, Arrasate Mondragon, Spain..
    Girs, Svetlana
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Uhlemann, Elisabeth
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Prediction of Communication Delays in Connected Vehicles and Platoons2023In: 2023 IEEE 97TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-SPRING, IEEE , 2023Conference paper (Refereed)
    Abstract [en]

    Automated vehicles connected through vehicle-tovehicle communications can use onboard sensor information from adjacent vehicles to provide higher traffic safety or passenger comfort. In particular, automated vehicles forming a platoon can enhance traffic safety by communicating before braking hard. It can also improve fuel efficiency by enabling reduced aerodynamic drag through short gaps. However, packet losses may increase the delay between periodic beacons, especially for the rear vehicles in a platoon. If the connected vehicles can forecast link quality, they can assign different performance levels in terms of intervehicle distances and also facilitate the designing of safer braking strategies. This paper proposes a strategy for incorporating machine learning algorithms into, e.g., the lead vehicle of a platoon to enable online training and real-time prediction of communication delays incurred by connected vehicles during runtime. The prediction accuracy and its suitability for making safety-critical decisions during, e.g., emergency braking have been evaluated through rigorous simulations.

  • 19.
    Håkonsen, Christian
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Berkelund, Mikael
    Mälardalen University, School of Innovation, Design and Engineering.
    Development of a new drawing system for STS2008Independent thesis Basic level (professional degree), 10 points / 15 hpStudent thesis
    Abstract [en]

    An engineering firm which handles and constructs drawings needs well defined routines and structures which should be homogeneous through all the different departments. A common drawing system results in better quality and cooperation between the departments.

    SAS Technical Services (STS) did not have a common drawing system which had led to development of different routines in the different regions and departments. Requested was development of new routines regarding engineering drawings, such as drawing numbering structure, revision and subscription routines, which standards to adhere to, custom made drawing templates and management of the drawings with belonging documents.

    Each requested task was broken into minor tasks and analyzed. Solutions by different leading engineering companies were used for comparison and ideas.

    All the tasks were collected and organized in one single document which is the result of the thesis; a drawing instruction.

    The drawing instruction will after a learning phase ease the work for the STS engineers as all necessary information can be found in one single place. Also, work with contractors will be time-saving as the instruction can be handed out for guidance.

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  • 20.
    Ibranovic, Albin
    Mälardalen University, School of Innovation, Design and Engineering.
    Westhelicopter AB Aircraft Technical Status Report2009Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Westhelicopter INC. has an aviation workshop providing qualified helicopter maintenance in accordance with PART-145. Maintenance and administrative base is situated in Luleå at Kallax airport. The types that Westhelicopter INC are currently authorised to service are: Eurocopter AS 350 Base/Line Maintenance, Eurocopter EC 120 Base/Line Maintenance and Robinsson R44 Base/Line Maintenance.

     

    The thesis work has been to make new maintenance programme for Westhelicopter INC. This maintenance programme will be used to follow-up the time of the components, service bulletins and ADs. Existing materials, as maintenance manuals and interviews with technical staff, was used to make more efficient maintenances programme. Work will be applied to all helicopters that Westhelicopter AB supplies.

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  • 21.
    Izadi, T.
    et al.
    School of Mechanical Engineering, Shiraz University, Iran; Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Iran.
    Mehrabian, M. A.
    Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Iran.
    Sadrizadeh, Sasan
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. KTH Royal Institute of Technology, Stockholm, Sweden.
    Olofsson, U.
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Abouali, O.
    School of Mechanical Engineering, Shiraz University, Iran; KTH Royal Institute of Technology, Stockholm, Sweden.
    The effect of ventilation system with and without under-platform exhaust on the concentration of braking micro-particles inside the subway system2022In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 128, article id 104638Article in journal (Refereed)
    Abstract [en]

    Thermal comfort has been the main target of the ventilation in subway systems. However, pollutant concentration and aerosol dispersion could be the leading health issues in underground metro stations. This study numerically simulated a train movement inside a subway system using the Dynamic Mesh Technique for a 3-D computational domain consisting of four stations and connecting tunnels. The effects of both the ventilation system and the train-induced fluid flow inside the subway system were investigated. Then, the particle generation and dispersion due to train braking are considered, and the impact of the ventilation system on reducing the particle concentration inside the station was investigated. It is shown that the airflow inside the subway system is entirely affected by the piston effect. The airflow generated by the train movement is much higher than that generated by the operation of the ventilation system when only one train passes through the tunnel. The results show that the ventilation system, consisting of the supply and exhaust fans inside the tunnel and supply grilles inside the platform, can reduce the particle concentration by half, except for the platform beside the stopped train when the train enters the station and during half of the train stop time. The other design concept demonstrates that the under-platform exhaust system considerably reduces the concentration of the particles released by the train braking system on the trackside platform.

  • 22.
    Karlsson, Robert
    Mälardalen University, Department of Mathematics and Physics.
    Experimentell motståndsanalys av kåpkonfigurationer på Scaniamodells busstak2008Independent thesis Basic level (degree of Bachelor), 15 points / 22,5 hpStudent thesis
    Abstract [sv]

    Sammanfattning

    Dagens stigande bränslepriser gör det alltmer viktigt för tillverkare samt brukare av fordon, att fokusera på detaljer som kan minimera drivmedelåtgången. Scania linjetrafikbussar är utrustade med ett antal olika konfigurationer av kåpor som figurerar på bussarnas tak.

    Projektet har således innefattat att undersöka dessa ur ett aerodynamisk perspektiv i Mälardalens högskolas låghastighetsvindtunnel, förlagt vid Hässlö i Västerås.

    Resultaten som uppnåddes är att motståndskofficienten kan reduceras från CD=0,46 till CD=0,41 genom att omplacera orginalkåporna på andra positioner över taket. CD =0,39 erhålls genom att bruka de aerodynamiskt modifierade kåporna. Det skapar en vinst på 55-60 000 kr för orginalkåporna och motsvarande en vinst på 75-80 000 kr för de modifierade kåporna, räknat under bussens livslängd och en drivmedelkostnad på 8 kr/l. Beräkningarna är snålt tilltagna för att ej ge ett överskattat värde, utan är mer ett resultat i underkant. I bilagorna figurerar även andra värden som ger än mer större vinst i kronor

    Resultat uppnås då man tenderar minimera det återcirkulerande och energialstrande flöde som skapas inledningsvis på bussens tak under dess färd.

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  • 23.
    Kozhakenov, Temirzhan
    Mälardalen University, School of Innovation, Design and Engineering.
    MODEL-BASED SIMULATION OF AUTOMOTIVE SOFTWARE SYSTEMS2020Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The car is the most common vehicle in the world. Millions of cars are produced annually. In order for each car to find its buyer, car companies are forced to constantly improve the design of the car. Modern models are emerging, new car systems are being developed and implemented. All this is accompanied by a huge flow of information, in which it is easy to get lost. This master’s work is devoted to the trace analysis and connection of two different files. The paper proposes a developed algorithm of trace analysis for some functions of the vehicle in the C++ programming language. The files that we use to trace analysis relate to the model and the final result of its simulation.EATOP is a tool with which a model based on the EAST-ADL language was developed. Adapt is an event simulator with which our model of automotive functionality was simulated. The purpose of the study is to identify possible ways to meet timing requirements. The work is carried out in collaboration with Volvo Group Truck Technology. This company provided the LogFile, which presents results of the simulation, and model. We get an analysis of performance, one of the ways to trace data and timing. The results of our implementation are presented and discussed.

  • 24.
    Kyprianidis, Konstantinos G.
    Cranfield University, UK.
    Multi-Disciplinary Conceptual Design of Future Jet Engine Systems2010Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This thesis describes various aspects of the development of a multi-disciplinary aero engine conceptual design tool, TERA2020 (Techno-economic, Environmental and Risk Assessment for 2020), based on an explicit algorithm that considers: engine performance, engine aerodynamic and mechanical design, aircraft design and performance, emissions prediction and environmental impact, engine and airframe noise, and production, maintenance and direct operating costs.

    As part of this research effort, a newly-derived semi-empirical NOx correlation for modern rich-burn single-annular combustors is proposed. The development of a numerical methods library is also presented, including an improved gradient-based algorithm for solving non-linear equation systems. Common assumptions made in thermo-fluid modelling for gas turbines and their effect on caloric properties are investigated, while the impact of uncertainties on performance calculations and emissions predictions at aircraft system level is assessed. Furthermore, accuracy limitations in assessing novel engine core concepts as imposed by current practice in thermo-fluid modelling are identified.

    The TERA2020 tool is used for quantifying the potential benefits from novel technologies for three low pressure spool turbofan architectures.  The impact of failing to deliver specific component technologies is quantified, in terms of power plant noise and CO2 emissions. To address the need for higher engine thermal efficiency, TERA2020 is again utilised; benefits from the potential introduction of heat-exchanged cores in future aero engine designs are explored and a discussion on the main drivers that could support such initiatives is presented. Finally, an intercooled core and conventional core turbofan engine optimisation procedure using TERA2020 is presented. A back-to-back comparison between the two engine configurations is performed and fuel optimal designs for 2020 are proposed.

    Whilst the detailed publications and the work carried out by the author, in a collaborative effort with other project partners, is presented in the main body of this thesis, it is important to note that this work is supported by 20 conference and journal papers.

  • 25.
    Li, Xueqiang
    et al.
    Tianjin University of Commerce, China.
    Song, Wenlei
    Tianjin University of Commerce, China.
    Wang, Qihui
    Tianjin University of Commerce, China.
    Li, Hailong
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Ding, Xiaofeng
    Beihang University, China.
    Liu, Shengchun
    Tianjin University of Commerce, China.
    Optimizing cooling electronic chips at high altitude with consideration of solar radiation2023In: International journal of thermal sciences, ISSN 1290-0729, E-ISSN 1778-4166, Vol. 183, article id 107879Article in journal (Refereed)
    Abstract [en]

    Maintaining a proper working environment for electronic chips is challenging for airships, as the ambient parameters at high altitude are largely different from those on the ground, which can influence the performance of cooling. This work aims to optimize the finned sink to minimize the weight with the consideration of the impact of solar radiation. By using a validated 3D model, it was found that the ignorance of the solar radiation can lead to a temperature deviation of 4.1 °C for electronic chips at 20 km when the solar radiation intensity was 1400 W/m2 and the wind speed was 10 m/s. Meanwhile, compared to the solar radiation intensity and the emissivity, the direction of solar radiation showed more impacts. In addition, even though the solar radiation doesn't influence the optimal fin height, fin number, and fin thickness, it would clearly affect the optimal heat transfer area ratio. As a result, it can clearly change the optimized weight, which was 5.7% higher if the solar radiation was not considered. © 2022 The Authors

  • 26.
    Lin, H.
    et al.
    Institute of Thermal Science and Technology, Shandong University, Jinan, China.
    Fu, K.
    Institute of Thermal Science and Technology, Shandong University, Jinan, China.
    Wang, Y.
    Institute of Thermal Science and Technology, Shandong University, Jinan, China.
    Sun, Q.
    Institute of Thermal Science and Technology, Shandong University, Jinan, China.
    Li, Hailong
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Hu, Y.
    UCL, Dept Civil Environm & Geomat Engn, London, England.
    Sun, B.
    Department of Civil, Environmental & Geomatic Engineering, University College London, London, United Kingdom.
    Wennersten, R.
    Institute of Thermal Science and Technology, Shandong University, Jinan, China.
    Characteristics of electric vehicle charging demand at multiple types of location - Application of an agent-based trip chain model2019In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 188, article id 116122Article in journal (Refereed)
    Abstract [en]

    This paper developed an agent-based trip chain model (ABTCM) to study the distribution of electric vehicles (EVs) charging demand and its dynamic characteristics, including flexibility and uncertainty, at different types of location. Key parameters affecting charging demand include charging strategies, i.e. uncontrolled charging (UC) and off-peak charging (OPC), and EV supply equipment, including three levels of charging equipment. The results indicate that the distributions of charging demand are similar as the travel patterns, featured by traffic flow at each location. A discrete peak effect was found in revealing the relation between traffic flow and charging demand, and it results in the smallest equivalent daily charging demand and peak load at public locations. EV charging and vehicle-to-grid (V2G) flexibility were examined by instantaneous adjustable power and accumulative adjustable amount of electricity. The EVs at home locations have the largest charging and V2G flexibility under the UC strategy, except for a period of regular working time. The V2G flexibility at work and public locations is generally larger than charging flexibility. Due to the fast charging application, the uncertainties of charging demand at public locations are the highest in all locations. In addition, the OPC strategy mitigates the uncertainty of charging demand. 

  • 27.
    Lindfors Lindell, Robin
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    AL-Jumaily, Mohammad
    Mälardalen University, School of Innovation, Design and Engineering.
    Evaluation of water spray as a boost function for a cooling system2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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  • 28.
    Marksteiner, Stefan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. AVL List GmbH, Austria.
    Priller, Peter
    AVL List GmbH, Austria.
    Wolf, Markus
    AVL List GmbH, Austria.
    Approaches for Automating Cybersecurity Testing of Connected Vehicles2024In: Intelligent Secure Trustable Things / [ed] M. Karner et al., Cham: Springer, 2024Chapter in book (Refereed)
    Abstract [en]

    Vehicles are on the verge building highly networked and interconnected systems with each other. Thisrequires open architectures with standardized interfaces. These interfaces provide huge surfaces forpotential threats from cyber attacks. Regulators therefore demand to mitigate these risks using structuredsecurity engineering processes. Testing the effectiveness of this measures, on the other hand, is lessstandardized. To fill this gap, this book chapter contains an approach for structured and comprehensivecybersecurity testing of contemporary vehicular systems. It gives an overview of how to define securesystems and contains specific approaches for (semi-)automated cybersecurity testing of vehicular systems,including model-based testing and the description of an automated platform for executing tests.

  • 29.
    Nilsson, Emma
    et al.
    Volvo Car Corporation, Sweden.
    Ahlström, Christer
    Barua, Shaibal
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Fors, Carina
    VTI, Sweden.
    Lindén, Per
    Volvo Car Corporation, Sweden.
    Svanberg, Bo
    Volvo Car Corporation, Sweden.
    Begum, Shahina
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Ahmed, Mobyen Uddin
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Anund, Anna
    VTI, Sweden.
    Vehicle Driver Monitoring: sleepiness and cognitive load2017Report (Other academic)
    Abstract [en]

    To prevent road crashes, it is important to understand driver related contributing factors. The overall aim of the Vehicle Driver Monitoring project was to advance the understanding of two such factors; sleepiness and cognitive distraction. The project aimed at finding methods to measure the two states, with focus on physiological measures, and to study their effect on driver behaviour. The data collection was done in several laboratory and driving simulator experiments. Much new knowledge and insights were gained in the project. Significant effects of cognitive load as well as of sleepiness were found in several physiological measures. The results also showed that context, including individual and environmental factors, has a great impact on driver behaviours, measures and driver experiences.

  • 30.
    Nogueira, Tiago
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Twofik, Twana
    Mälardalen University, Department of Mathematics and Physics.
    MD-80 Engine Change Kit2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This report’s aim is to verify if it is possible, and if so, by how much SAS Component could increase the threshold values of all incoming components belonging to an MD-80 Engine Change Kit. How would this raise in the components threshold lower SAS Component’s expenses?

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  • 31.
    Nyström, Olof
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Pettersson, Caroline
    Mälardalen University, Department of Mathematics and Physics.
    Utvärdering och rekommendation av uppföljningsprogram för flygplanunderhåll: för Täby Air Maintenance2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    By today’s date there are a lot of companies that are in great need of restructuring their paperwork in a more organized way. This can be excellent arranged with the help of properly constructed computer software. The aviation industry is no exception, but actually a good example of this. Täby Air Maintenance (TAM) is a company which is situated in Örebro. Their main business is aircraft maintenance on a variety of aircraft models. TAM has so far handled their work by hand or with the help of a majority of small computer programmes. The information has now become too abundant and the different kinds of software being used are no longer a working tool for the company. There is therefore a demand for an exhaustive programme which has the capacity to take care of all parts in logistics and production. The purpose is to examine and evaluate three different makes of software and form a recommendation to TAM of which one suits their needs the best. The software was Airsoft, MX System and System Airline Management (SAM). The evaluation has been performed with the help of demo versions of the programmes, manuals and support from contacts at the different manufacturers. The programmes were initially dealt with one at a time and then compared towards each other and towards the demands from TAM. The software which in the end was recommended was SAM, and the decision was based on a number of reasons. The main reason was the user friendliness of the software - the fact that its logical structure makes it easy for its user to swiftly understand the concept and thus learn how to use it quickly. This results in profits, both in time and money.

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  • 32.
    Rahman, Hamidur
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Begum, Shahina
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Ahmed, Mobyen Uddin
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Driver monitoring in the context of autonomous vehicle2015In: Frontiers in Artificial Intelligence and Applications, Amsterdam, 2015, Vol. 278, p. 108-117Conference paper (Refereed)
    Abstract [en]

    Today research is going on within different essential functions need to bring automatic vehicles to the roads. However, there will be manual driven vehicles for many years before it is fully automated vehicles on roads. In complex situations, automated vehicles will need human assistance for long time. So, for road safety driver monitoring is even more important in the context of autonomous vehicle to keep the driver alert and awake. But, limited effort has been done in total integration between automatic vehicle and human driver. Therefore, human drivers need to be monitored and able to take over control within short notice. This papers provides an overview on autonomous vehicles and un-obstructive driver monitoring approaches that can be implemented in future autonomous vehicles to monitor driver e.g., to diagnose and predict stress, fatigue etc. in semi-automated vehicles. 

  • 33.
    Shahbazi, Sasha
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Kurdve, Martin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Mohammadi, Zahra
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Critical Factors in Designing of Lean and Green Equipment2014Conference paper (Other academic)
  • 34.
    Tåg, Viktor
    Mälardalen University, School of Innovation, Design and Engineering.
    Framtagning av portabel patientlyft2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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  • 35.
    Vidimlic, Najda
    et al.
    Mälardalen University.
    Levin, Alexandra
    Mälardalen University.
    Loni, Mohammad
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Daneshtalab, Masoud
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Image synthesisation and data augmentation for safe object detection in aircraft auto-landing system2021In: VISIGRAPP 2021 - Proceedings of the 16th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, SciTePress , 2021, Vol. 5, p. 123-135Conference paper (Refereed)
    Abstract [en]

    The feasibility of deploying object detection to interpret the environment is questioned in several mission-critical applications leading to raised concerns about the ability of object detectors in providing reliable and safe predictions of the operational environment, regardless of weather and light conditions. The lack of a comprehensive dataset, which causes class imbalance and detection difficulties of hard examples, is one of the main reasons of accuracy loss in attitude safe object detection. Data augmentation, as an implicit regularisation technique, has been shown to significantly improve object detection by increasing both the diversity and the size of the training dataset. Despite the success of data augmentation in various computer vision tasks, applying data augmentation techniques to improve safety has not been sufficiently addressed in the literature. In this paper, we leverage a set of data augmentation techniques to improve the safety of object detection. The aircraft in-flight image data is used to evaluate the feasibility of our proposed solution in real-world safety-required scenarios. To achieve our goal, we first generate a training dataset by synthesising the images collected from in-flight recordings. Next, we augment the generated dataset to cover real weather and lighting changes. Introduction of artificially produced distortions is also known as corruptions and has since recently been an approach to enrich the dataset. The introduction of corruptions, as augmentations of weather and luminance in combination with the introduction of artificial artefacts, is done as an approach to achieve a comprehensive representation of an aircraft’s operational environment. Finally, we evaluate the impact of data augmentation on the studied dataset. Faster R-CNN with ResNet-50-FPN was used as an object detector for the experiments. An AP@[IoU=.5:.95] score of 50.327% was achieved with the initial setup, while exposure to altered weather and lighting conditions yielded an 18.1% decrease. The introduction of the conditions into the training set led to a 15.6% increase in comparison to the score achieved from exposure to the conditions. 

  • 36.
    Zoljodi, Ali
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Loni, Mohammad
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Abadijou, Sadegh
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Alibeigi, Mina
    Zenseact AB, Gothenburg, Sweden.
    Daneshtalab, Masoud
    Tallinn University of Technology, Estonia.
    3DLaneNAS: Neural Architecture Search for Accurate and Light-Weight 3D Lane Detection2022In: Artificial Neural Networks and Machine Learning – ICANN 2022: 31st International Conference on Artificial Neural Networks, Bristol, UK, September 6–9, 2022, Proceedings, Part I / [ed] Elias Pimenidis; Plamen Angelov; Chrisina Jayne; Antonios Papaleonidas; Mehmet Aydin, Springer Science and Business Media Deutschland GmbH , 2022, p. 404-415Conference paper (Refereed)
    Abstract [en]

    Lane detection is one of the most fundamental tasks for autonomous driving. It plays a crucial role in the lateral control and the precise localization of autonomous vehicles. Monocular 3D lane detection methods provide state-of-the-art results for estimating the position of lanes in 3D world coordinates using only the information obtained from the front-view camera. Recent advances in Neural Architecture Search (NAS) facilitate automated optimization of various computer vision tasks. NAS can automatically optimize monocular 3D lane detection methods to enhance the extraction and combination of visual features, consequently reducing computation loads and increasing accuracy. This paper proposes 3DLaneNAS, a multi-objective method that enhances the accuracy of monocular 3D lane detection for both short- and long-distance scenarios while at the same time providing a fair amount of hardware acceleration. 3DLaneNAS utilizes a new multi-objective energy function to optimize the architecture of feature extraction and feature fusion modules simultaneously. Moreover, a transfer learning mechanism is used to improve the convergence of the search process. Experimental results reveal that 3DLaneNAS yields a minimum of 5.2% higher accuracy and ≈ 1.33 × lower latency over competing methods on the synthetic-3D-lanes dataset. Code is at https://github.com/alizoljodi/3DLaneNAS

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