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  • 1.
    Anwar, Muhammad Waseem
    et al.
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    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 Systems2022Ingår i: Communications in Computer and Information Science, Springer Science and Business Media Deutschland GmbH , 2022, s. 197-208Konferensbidrag (Refereegranskat)
    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
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Analysis of the Z-wing configuration2011Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 3.
    Axelsson, Jakob
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Safety in Vehicle Platooning: A Systematic Literature Review2017Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 18, nr 5, s. 1033-1045Artikel, forskningsöversikt (Refereegranskat)
    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.
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Ahmed, Mobyen Uddin
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Begum, Shahina
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Multi-scale Data Fusion and Machine Learning for Vehicle Manoeuvre Classification2023Ingår i: ICSET 2023 - 2023 IEEE 13th International Conference on System Engineering and Technology, Proceeding, Institute of Electrical and Electronics Engineers Inc. , 2023, s. 296-301Konferensbidrag (Refereegranskat)
    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
    Mälardalens högskola, Institutionen för matematik och fysik.
    Evaluation of Fuel Saving for an Airline2008Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    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.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 6.
    Bergman, David
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Modelling & implementation of Aerodynamic Zero-lift Drag into ADAPDT2009Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Målet med detta examensarbete var att skapa och implementera en algoritm som införmöjligheten att beräkna nollmotstånd för givna flygplansgeometrier i programmet ADAPDT.ADAPDT, kort för AeroDynamic Analysis and Preliminary Design Tool, är ett program som,baserat på potential strömnings teori, beräknar krafter och moment på en geometri uppbyggd avplana plattor. Nollmotståndet kommer att baseras en kombination av handboksmetoder somfunnits lämpliga och applicerbara på geometridefinitionen given i ADAPDT.

    Motstånd har sitt ursprung i två fysikaliska fenomen: friktion och tryckfördelning, ur vilka alltmotstånd som agerar på ett flygplan härrör. Inom flyget delar man in motståndet ilyftkraftsberoende inducerat motstånd samt geometriberoende nollmotstånd.

    Hur pålitliga och noggranna motståndsberäkningarna kan förväntas vara beror på mängdengeometriska data som finns att tillgå. ADAPDT:s geometridefinition är begränsad till planaplattor men trots detta finns potential att leverera stora mängder data och resultat med rimlignoggrannhet. Plan plattgeometrin visade sig, för kroppsgeometrin, väldigt begränsad ochotillräcklig medan ving element kunde beskrivas med större noggrannhet.

    En rad olika empiriska handboksmetoder användes för att skapa nollmotståndsalgoritmen. Vidvalet av formler och ekvationer var det viktigt att välja sådana som ADAPDT kunde försetillräckligt med data till. Samtidigt fick formlerna inte vara alltför simpla så att måttet avnoggrannhet i resultaten vart alltför låg mot för vad som, för ändamålet, är förväntat.

    Slutligen valdes fyra kända flygplan, med nollmotståndsdata tillgängligt, att modeleras medADAPDT:s plan plattgeometri för att validera, verifiera och utvärdera algoritmens mått avtillförlitlighet. Resultaten för mer konventionella flygplanskonfigurationer visade på ett relativtfel mellan 0-15 % mot de givna referensflygplanens nollmotståndsdata inom hastigheterna 0 tillMach 1,2. För mer komplicerade konfigurationer steg det relativa felet omedelbart upp mot 40% inom samma hastighetsregim. Men även om den begränsade geometridefinitionen iADAPDT är grunden för mycket osäkerheter förser den slutliga produkten ändå programmetmed en väldigt god möjlighet till skattning av nollmotståndet som inte tidigare fanns. Enmöjlighet som över tid, allteftersom ADAPDT forstätter att utvecklas, har all potential till attförbättras med avseende på noggrannhet och tillförlitlighet.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 7.
    Bergman, Niklas
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Effects of Mach cruise number on conventional civil jet aircraft sizing2009Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 8.
    Bernström, David
    et al.
    Mälardalens universitet, Akademin för innovation, design och teknik.
    Nyström, Erik
    Mälardalens universitet, Akademin för innovation, design och teknik.
    RECOMMENDATIONS FOR A DEPENDABLE ROV SYSTEM FOR SWEDISH MARITIME RESEARCH2023Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    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.

    Ladda ner fulltext (pdf)
    fulltext
  • 9.
    Boman, David
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Implementation of UAV design into CAD2011Självständigt arbete på grundnivå (yrkesexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    SAMMANFATTNING

    Detta arbete har gått ut på att i CAD implementera en UAV-design av Enebog, Designen har förmedlats av handledaren via möten och mail. Ett ”levande” dokument skapades och har sedan uppdaterats från båda sidor genom projektets fortlöpande. Dimensioner och mått har diskuterats samt hur det ska implementeras i CAD. UAV’n är uppbyggd som en ”assembly” i CAD, med tillhörande modeller och ”sub-assemblies”. Modellerna är designade i Solid Works standard-arbetsbänk och ihopsatta i assemblyn med så kallade ”mates”. Tyngdpunkt och massa har beräknats i Solid Works för flygplanets olika delar. Datat har exporterats till Excel för att kunna presenteras.

    Resultatet är 7 stycken 2D ritningar kopplade till en 3D modell. Flygplanet har en spännvidd på 2,7 meter och en vingarea på 0,91m2. Den totala längden dimensionerades till 1,87 meter och den totala massan kalkylerades till 8,68 kg, som också är flygplanets ”take off weight”. Flygplanet är designat för att byggas med två olika komposit material: kolfiber/epoxy och glasfiber/epoxy. I ritningsunderlaget genererares tre-plans vyer med måttsättning, detaljvyer på till exempel nos-poden i den främre delen av flygplanet samt en sprängskiss med innehållsförteckning.

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  • 10.
    Brander, Kristoffer
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Förbättrad saverringsdesign för dieselmotor2014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Vid drift av en dieselmotor skapas kontinuerligt små mängder avlagringar som sedan kan forma ett hårt lager kallat koks. Kokset bildas vid kontakt med heta ytor och ett sådant område är toppland, längst upp på utsidan av kolven. När lagret blir tillräckligt tjockt skrapar det insidan av cylindern vilket påverkar ytan negativt samtidigt som den blir ojämn. Oljeförbrukningen ökar dessutom, då den olja som finns på insidan av cylindern trycks uppåt och därmed förbränns i förbränningsrummet. För att få bukt med problemet har Scania infört en så kallad saverring. Denna sitter längst upp i cylindern i höjd med vändpunkten för kolvens toppland. Genom att den har en mindre inre diameter än cylindern skrapar den bort koks från toppland innan lagret blir så tjockt att det når cylinderväggen.

    Målet med arbetet som utförts på Scania är att förbättra designen på saverringen så att den ger upphov till så lite tomma volymer som möjligt. Dessa kallas dödvolymer och påverkar motorns egenskaper negativt, framförallt genom att bränsleförbrukningen ökar. Scania vill också att eventuella alternativ till saverring som dyker upp under arbetets gång redovisas.

    Saverringen delades upp i olika områden där varje område undersöktes för att försöka minska dödvolymen så långt som möjligt. De nuvarande dödvolymerna togs fram i ett 3d-modelleringsprogram och förslag gjordes för att minska dessa. Parametrar som funktion, dödvolym, robusthet och påverkan på kostnad togs i beaktande för att komma fram till en så optimal lösning som möjligt. Kontinuerlig kontakt med tillverkaren av saverringen säkerställde att de ändringar som föreslogs var genomförbara. Om den nuvarande symmetrin på saverringen ändras behövs ett sätt att säkerställa att den monteras rätt vid produktion, förslag jämfördes mot varandra för att hitta den bästa lösningen.

    Ett designförslag på saverringen som minskar dödvolymerna med 56,4 % och därmed bränsleförbrukningen med ca 0,125 % togs fram. Slutsatsen är att saverring är den effektivaste lösningen och att en designförändring kan göras för att förbättra lösningen ytterligare.

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  • 11.
    Cederbladh, Johan
    et al.
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Reale, A.
    Dynatrace, Klagenfurt, Austria.
    Bergsten, A.
    Alstom, Västerås, Sweden.
    Mikelov, R.
    Saab Aeronautics, Linköping, Sweden.
    Cicchetti, Antonio
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Barriers for Adopting FMI-Based Co-Simulation in Industrial MBSE Processes2023Ingår i: 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, s. 510-519Konferensbidrag (Refereegranskat)
    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.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Berg, Johannes
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Methods for Failure Analysis Data within Databases and Aids2009Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

    Ladda ner fulltext (pdf)
    Methods for Failure Analysis Data
  • 13.
    Edkvist, Markus
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Genomgång av A-checkupplägg till Dash 8 Q4002015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    I den här rapporten redovisas det examensarbete som jag utfört för flygbolaget Widerøe. Arbetet går ut på att kontrollera vad som sker då man väljer att öka planeringsintervallet på a-checkar.  Flygbolaget önskar få svar på om en ökning av intervallet mellan checktillfällena kan leda till en möjlighet att öka flottan.

    I dagsläget har man 11 st. Dash 8 Q400 och ser en möjlig ökning med upp till 3 plan. Den ökningen ska vara möjlig utan att man behöver öka hangartillgången eller bemanningen.

    Det som bestämmer hur ofta en check skall utföras är de underhållsuppgifter som har kortast underhållsintervall. På Dash 8 är det kortaste intervallet 600 flygtimmar. Således bör en check utföras en gång varje 600 flygtimme. Men då det är relativt många underhållsuppgifter som kommer att utföras vid varje checktillfälle har man valt att dela upp arbetet. Det har man gjort genom att dela varje checkpaket i fyra mindre paket. Det gör att man får en uppdelning om 150 flygtimmar istället för 600, samt att man får kortare tid mellan varje underhållstillfälle, och vid varje tillfälle färre underhållsuppgifter.

    Uppgiften startade med att ta fram ett nytt checkpaket med 600 flygtimmars intervall. Det gjorde jag genom att det befintliga checkpaketet med 150 flygtimmars intervall lades ihop till ett checkpaket med 600 timmars intervall. Efter det krävdes ett omfattande arbete för att definiera skillnader mellan de olika checkpaketen. Jag började med att räknade på om man sparade eller inte sparade tid genom att förlänga intervallet. Efter det optimerade jag hur många tekniker som skulle behövas vid varje checkutförande för att sedan räkna ut den totala tidsåtgången för varje check. 

    Jag kom fram till två möjliga lösningar. Det första alternativet är att använda ett Checkprogram på 600 flygtimmars intervall och då öka flottan med två flygplan. Det andra alternativet är använda sig av ett checkprogram på 300FH och öka flottan med ett plan.

     

    Ladda ner fulltext (pdf)
    fulltext
  • 14.
    Ferreira, Klas
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Jeleborg, Douglas
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Anpassning och optimering av checkprogram för AW1392015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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.

    Ladda ner fulltext (pdf)
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  • 15.
    Foskolos, Georgios
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Measurement-based current-harmonics modeling of aggregated electric-vehicle loads using power-exponential functions2020Ingår i: World Electric Vehicle Journal, E-ISSN 2032-6653, Vol. 11, nr 3, artikel-id 51Artikel i tidskrift (Refereegranskat)
    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
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    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 driving2023Ingår i: Frontiers in Neurorobotics, ISSN 1662-5218, Vol. 17, artikel-id 1240933Artikel i tidskrift (Refereegranskat)
    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
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Islam, Mir Riyanul
    Mälardalens universitet, Akademin för innovation, design och teknik.
    Gomez, Arrate Alonso
    Mondragon Unibertsitatea, Spain.
    Girs, Svetlana
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Uhlemann, Elisabeth
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Analyzing Inter-Vehicle Collision Predictions during Emergency Braking with Automated Vehicles2023Ingår i: International Conference on Wireless and Mobile Computing, Networking and Communications, IEEE Computer Society , 2023, Vol. 2023-June, s. 411-418Konferensbidrag (Refereegranskat)
    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.
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    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
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Uhlemann, Elisabeth
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system.
    Prediction of Communication Delays in Connected Vehicles and Platoons2023Ingår i: 2023 IEEE 97TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-SPRING, IEEE , 2023Konferensbidrag (Refereegranskat)
    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.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Berkelund, Mikael
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Development of a new drawing system for STS2008Självständigt arbete på grundnivå (yrkesexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    En ingenjörsfirma som hanterar och skapar mängder med ritningar behöver väldefinierade rutiner och strukturer som är homogena genom hela bolaget. Ett gemensamt ritningssystem resulterar i bättre kvalitet och bättre samarbete mellan de olika avdelningarna.

    SAS Technical Services (STS) hade inte ett gemensamt ritningssystem vilket har lett till att de olika avdelningarna har utvecklat olika rutiner rörande ritningar. Önskemålet var utvecklande av nya rutiner rörande ingenjörsritningar såsom ritningsnumreringsstruktur, revisions- och prenumerationsrutiner, vilka standarder som skall följas, egna ritningsmallar och skötsel av ritningar med tillhörande dokument.

    Varje önskad uppgift blev uppdelad i mindre uppgifter och analyserad. Lösningar från olika ledande ingenjörsbolag användes för jämförelse och idéer.

    Alla uppgifterna samlades och organiserades i ett och samma dokument som är resultatet av detta arbete; en ritningsinstruktion.

    Ritningsinstruktionen kommer efter en inlärningsfas underlätta arbetet för ingenjörerna på STS eftersom all nödvändig information nu finns på ett och samma ställe. Arbeten med entreprenörer vill också bli underlättande eftersom instruktionen kan delas ut för vägledning.

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  • 20.
    Ibranovic, Albin
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Westhelicopter AB Aircraft Technical Status Report2009Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    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
    Mälardalens universitet, Akademin för ekonomi, samhälle och teknik, Framtidens energi. 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 system2022Ingår i: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 128, artikel-id 104638Artikel i tidskrift (Refereegranskat)
    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
    Mälardalens högskola, Institutionen för matematik och fysik.
    Experimentell motståndsanalys av kåpkonfigurationer på Scaniamodells busstak2008Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats
    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
    Mälardalens högskola, Akademin för innovation, design och teknik.
    MODEL-BASED SIMULATION OF AUTOMOTIVE SOFTWARE SYSTEMS2020Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    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 Systems2010Doktorsavhandling, monografi (Övrigt vetenskapligt)
    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
    Mälardalens universitet, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Ding, Xiaofeng
    Beihang University, China.
    Liu, Shengchun
    Tianjin University of Commerce, China.
    Optimizing cooling electronic chips at high altitude with consideration of solar radiation2023Ingår i: International journal of thermal sciences, ISSN 1290-0729, E-ISSN 1778-4166, Vol. 183, artikel-id 107879Artikel i tidskrift (Refereegranskat)
    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
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    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 model2019Ingår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 188, artikel-id 116122Artikel i tidskrift (Refereegranskat)
    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.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    AL-Jumaily, Mohammad
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Evaluation of water spray as a boost function for a cooling system2015Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
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  • 28.
    Marksteiner, Stefan
    et al.
    Mälardalens universitet, Akademin för innovation, design och teknik, Inbyggda system. AVL List GmbH, Austria.
    Priller, Peter
    AVL List GmbH, Austria.
    Wolf, Markus
    AVL List GmbH, Austria.
    Approaches for Automating Cybersecurity Testing of Connected Vehicles2024Ingår i: Intelligent Secure Trustable Things / [ed] M. Karner et al., Cham: Springer, 2024Kapitel i bok, del av antologi (Refereegranskat)
    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
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Fors, Carina
    VTI, Sweden.
    Lindén, Per
    Volvo Car Corporation, Sweden.
    Svanberg, Bo
    Volvo Car Corporation, Sweden.
    Begum, Shahina
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Anund, Anna
    VTI, Sweden.
    Vehicle Driver Monitoring: sleepiness and cognitive load2017Rapport (Övrigt vetenskapligt)
    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.
    Mälardalens högskola, Institutionen för matematik och fysik.
    Twofik, Twana
    Mälardalens högskola, Institutionen för matematik och fysik.
    MD-80 Engine Change Kit2007Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    Den här rapporten ämnar svara på frågan om och med hur mycket tröskelvärdena av alla inkommande komponenter, tillhörande ett MD-80 Engine change kit, kan höjas med och vilka kostnadsbesparingar en sådan höjning kan medföra. Undersökningen har föranletts av företaget SAS Components vilja att få reda på om en optimering av tröskelvärden kan leda till en minskning av kasserade komponenter hos dem.

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  • 31.
    Nyström, Olof
    et al.
    Mälardalens högskola, Institutionen för matematik och fysik.
    Pettersson, Caroline
    Mälardalens högskola, Institutionen för matematik och fysik.
    Utvärdering och rekommendation av uppföljningsprogram för flygplanunderhåll: för Täby Air Maintenance2007Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    Idag är många företag i trängande behov av att strukturera upp sitt pappersarbete på ett mer ordnat sätt. Detta kan ske på ett effektivt sätt med ett anpassat och ändamålsenligt strukturerat datorprogram. Flygbranschen är inget undantag, snarare ett bra exempel på detta. Täby Air Maintenance (TAM) är ett företag som är beläget i Örebro och utför underhåll på flygplan i varierande storlek. TAM har hittills skött arbetet för hand och med hjälp av ett flertal mindre datorprogram. Informationen har dock blivit alldeles för omfångsrik och de olika programmen är inte längre ett fungerande instrument för verksamheten. Det krävs därför ett heltäckande program som har kapaciteten att ta hand om alla delar, såväl logistik som produktion. Syftet är att undersöka tre olika program och ge en rekommendation på det som passar företaget bäst. Programmen är Airsoft, MX System och System Airline Management (SAM). Undersökningen har utförts med hjälp av demoversioner, manualer och stöd från kontaktpersoner hos tillverkarna. Programmen undersöktes först var för sig och därefter jämfördes de mot varandra och mot TAMs krav. Det program som rekommenderades var SAM. Detta beror på en mängd orsaker, där den främsta orsaken var programmets användarvänlighet - det faktum att dess logiska uppbyggnad gör det lätt för användaren att snabbt kunna sätta sig in i strukturen och därmed lättare kunna lära sig att använda det. Detta i sin tur ger vinster i både tid och pengar.

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    FULLTEXT01
  • 32.
    Rahman, Hamidur
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Begum, Shahina
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Driver monitoring in the context of autonomous vehicle2015Ingår i: Frontiers in Artificial Intelligence and Applications, Amsterdam, 2015, Vol. 278, s. 108-117Konferensbidrag (Refereegranskat)
    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.
    Mälardalens högskola, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Kurdve, Martin
    Mälardalens högskola, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Mohammadi, Zahra
    Mälardalens högskola, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Critical Factors in Designing of Lean and Green Equipment2014Konferensbidrag (Övrigt vetenskapligt)
  • 34.
    Tåg, Viktor
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Framtagning av portabel patientlyft2014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Ladda ner fulltext (pdf)
    fulltext
  • 35.
    Vidimlic, Najda
    et al.
    Mälardalens högskola.
    Levin, Alexandra
    Mälardalens högskola.
    Loni, Mohammad
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Daneshtalab, Masoud
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Image synthesisation and data augmentation for safe object detection in aircraft auto-landing system2021Ingår i: VISIGRAPP 2021 - Proceedings of the 16th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, SciTePress , 2021, Vol. 5, s. 123-135Konferensbidrag (Refereegranskat)
    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.
    Mälardalens universitet, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Loni, Mohammad
    Mälardalens universitet, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Abadijou, Sadegh
    Mälardalens universitet, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    Alibeigi, Mina
    Zenseact AB, Gothenburg, Sweden.
    Daneshtalab, Masoud
    Tallinn University of Technology, Estonia.
    3DLaneNAS: Neural Architecture Search for Accurate and Light-Weight 3D Lane Detection2022Ingår i: 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, s. 404-415Konferensbidrag (Refereegranskat)
    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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