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  • 1.
    Andersson, Carina
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Bengtsson, Marcus
    Mälardalen University, Department of Innovation, Design and Product Development.
    Essential Information Forms in a Condition Monitoring Context2009In: International Journal of COMADEM, ISSN 1363-7681, Vol. 12, no 4, p. 10-20Article in journal (Refereed)
    Abstract [en]

    The purpose of the study is to describe an information theory in order to achieve a fruitful discussion of information within condition monitoring in a condition based maintenance context. The paper is based on a qualitative and interdisciplinary approach. A case study is performed at four Swedish paper mills and one condition monitoring supplier. Interviews have been the main method for data collection; however, observations and studies of artifacts are included in the study also. The main contribution of the study is a framework that visualizes how data and five different forms of information interact and turns into knowledge about a machine’s condition. These forms of information are all necessary to take into consideration when implementing and operating a condition based maintenance program. The research results state that it is relevant to allow and encourage the technicians and operators to utilize several forms of information when assessing the condition of an asset, and, thus, to not put too much trust in the condition monitoring technology alone. Also, it can be important to encourage user interface designers to reflect upon the different contexts and information forms as they design information in a condition monitoring interface.

  • 2.
    Olsson, E.
    et al.
    Saab AB, Nettovagen 6, Jarfalla, 175 41, Sweden.
    Candell, O.
    Saab AB, Arboga, Sweden.
    Funk, Peter
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sohlberg, Rickard
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Assessment and Modelling of Joint Command and Control in Aircraft Maintenance Contexts Using Enterprise Models and Knowledge Graph Representations2022In: International Journal of COMADEM, ISSN 1363-7681, Vol. 25, no 2, p. 13-22Article in journal (Refereed)
    Abstract [en]

    The increasingly complex context of dynamic, high-tempo military air operations raise new needs for aircraft maintenance and logistic support systems to more rapidly respond to changes in operational needs and available resources, with retained support resource efficiency. The future maintenance and support system are thus envisioned with improved net-centric capabilities to facilitate matching of tactical needs with aircraft maintenance capabilities. The study addresses this challenge by creating abstract representations and definitions of relevant tactical structures and maintenance structures, processes, and resources using enterprise modelling. By addressing this in a holistic perspective, a better understanding of the matching problem is achieved, enabling efficient matching of operational needs with available resources. Based on these findings, graph models are created from a domain-centric view of two adjacent domain contexts, which includes command and control and aircraft maintenance contexts. The result has the ability to leverage interoperability and collaboration between air- and ground-based systems by facilitating interactions between tactical needs and aircraft maintenance resources.

  • 3.
    Rastegari, Ali
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. Volvo GTO, Köping, Sweden.
    Archenti, A.
    KTH Royal Institute of Technology, Sweden.
    Online Vibration Condition Monitoring of Gas Circulation Fans in Hardening Process2018In: International Journal of COMADEM, ISSN 1363-7681, Vol. 1, no 1, p. 25-29Article in journal (Refereed)
    Abstract [en]

    Vibration analysis and the Shock Pulse Method (SPM) are two of the most popular condition monitoring techniques used in Condition-Based Maintenance (CBM) policy, especially for rotating equipment. To illustrate the extent to which advanced CBM techniques (in this case, vibration analysis and SPM) are applicable and cost effective in a manufacturing company, a pilot project was followed in real time. The pilot project was performed at a large manufacturing site in Sweden. The purpose of the project was to implement online condition monitoring of five critical gas circulation fans in the hardening process of the manufacturing company. This paper presents some of the main findings of the online condition monitoring of the fans for a period of three years. Consequently, based on the empirical data, the company was able to gain great profit due to preventing production losses by preventing breakdowns of the fans.

  • 4.
    Rastegari, Ali
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. Volvo GTO, Köping, Sweden.
    Salonen, Antti
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. Volvo GTO, Köping, Sweden.
    Strategic maintenance management: Formulating maintenance strategy2015In: International Journal of COMADEM, ISSN 1363-7681, Vol. 18, no 1, p. 5-14Article in journal (Refereed)
    Abstract [en]

    In recent decades, by introducing lean manufacturing the vulnerability to system disturbances has increased and so, the demand for dependable production equipment. The need for having high production equipment availability causes companies to need a more effective and efficient maintenance strategy in order to stay competitive. Despite the increasing demand on reliable production equipment, few manufacturing companies work with strategic maintenance development and a large part of the manufacturing industry lack clear maintenance strategies. It is therefore difficult to develop the maintenance work in accordance with the strategic goals of the manufacturing companies.

    The main objective of this paper is to define a process for formulating maintenance strategy in order to facilitate further development in a strategic way. The problem has been studied by literature review and through case study at one major manufacturing site in Sweden to investigate the company’s view on strategic maintenance development. Hence, a formulated maintenance strategy has been provided and presented. The company’s overall goals considered and translated to the strategic objective of maintenance. Moreover, balanced score card is used as a tool to make a framework of the maintenance strategy. As a result of this study, the company could easily formulate a maintenance strategy by using a simple process based on the tools that they have already used. In addition to this, the result indicated how maintenance strategy can contribute to the company’s business goals.

  • 5.
    Rastegari, Ali
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. Volvo GTO, Köping, Sweden.
    Sasha, Shahbazi
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Bengtsson, Marcus
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Condition-based maintenance effectiveness from material efficiency perspective2017In: International Journal of COMADEM, ISSN 1363-7681, Vol. 20, no 1, p. 23-27Article in journal (Refereed)
    Abstract [en]

    This paper addresses the controversial gap between the environmental perspective and the cost perspective in a manufacturing context. The results of an empirical study on the heat treatment and phosphating processes performed by a manufacturing company indicate that implementing condition-based maintenance contributes not only to cost savings by preventing production losses and reducing equipment downtime but also to a more efficient use of resources by avoiding the generation of scraps and material wastage.

  • 6. Salonen, Antti
    Formulation of maintenance strategies: A simplified process2012In: International Journal of COMADEM, ISSN 1363-7681, Vol. 15, no 3, p. 9-18Article in journal (Refereed)
    Abstract [en]

    There is large financial potential in optimum production maintenance. Research has indicated that as much as one third of the maintenance cost is unnecessarily spent due to bad planning, overtime costs, bad use of preventive maintenance etc. However, studies have shown that few manufacturing companies consider maintenance to be a strategic area. Even among those firms that do have a maintenance strategy it is not evident that their strategies are clearly linked to the business strategies. Many companies in the manufacturing industry seem to find formulation of maintenance strategies to be difficult. To some extent this is due to lack of formal competence in maintenance management. Also companies often find the formulation process too resource demanding. Therefore, maintenance strategies are not widely used in manufacturing industry today. In addition, there seems to be no clear picture of what components a maintenance strategy could or should include. With this in mind, this paper aims at presenting a process for the formulation of maintenance strategies in discrete item manufacturing organizations. Important criteria for the formulation process are that it is easy to follow and that it does not require vast amount of resources.

    The results show that the formulation process, developed and tested in this study, has been easy to use and understand. The three case companies have found that their new maintenance strategies have given them a good picture of the present situation, as well as good guidance in their necessary improvement work.

  • 7.
    Xiong, Ning
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Olsson, Tomas
    Mälardalen University, School of Innovation, Design and Engineering.
    Funk, Peter
    Mälardalen University, School of Innovation, Design and Engineering.
    Case-based reasoning supports fault diagnosis using sensor information2013In: International Journal of COMADEM, ISSN 1363-7681, Vol. 16, no 4, p. 25-30Article in journal (Refereed)
    Abstract [en]

    Fault diagnosis and prognosis of industrial equipment become increasingly important for improving the quality of manufacturing and reducing the cost for product testing. This paper advocates that computer-based diagnosis systems can be built based on sensor information and by using case-based reasoning methodology. The intelligent signal analysis methods are outlined in this context. We then explain how case-based reasoning can be applied to support diagnosis tasks and four application examples are given as illustration. Further, discussions are made on how CBR systems can be integrated with machine learning techniques to enhance its performance in practical scenarios.

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