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  • 1.
    Aranke, Omkar
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Algenaid, Wael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Awe, Samuel
    R and D Department, Automotive Components Floby AB, Floby, 52151, Sweden.
    Joshi, Shrikant V.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Coatings for automotive gray cast iron brake discs: A review2019Inngår i: Coatings, ISSN 2079-6412, Vol. 9, nr 9, artikkel-id 552Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gray cast iron (GCI) is a popular automotive brake disc material by virtue of its high melting point as well as excellent heat storage and damping capability. GCI is also attractive because of its good castability and machinability, combined with its cost-effectiveness. Although several lightweight alloys have been explored as alternatives in an attempt to achieve weight reduction, their widespread use has been limited by low melting point and high inherent costs. Therefore, GCI is still the preferred material for brake discs due to its robust performance. However, poor corrosion resistance and excessive wear of brake disc material during service continue to be areas of concern, with the latter leading to brake emissions in the form of dust and particulate matter that have adverse effects on human health. With the exhaust emission norms becoming increasingly stringent, it is important to address the problem of brake disc wear without compromising the braking performance of the material. Surface treatment of GCI brake discs in the form of a suitable coating represents a promising solution to this problem. This paper reviews the different coating technologies and materials that have been traditionally used and examines the prospects of some emergent thermal spray technologies, along with the industrial implications of adopting them for brake disc applications. © 2019 by the authors.

    Fulltekst (pdf)
    fulltext
  • 2.
    Bachmann, Gabriel
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Göbel, Niklas
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Evaluation of requirements for measurement technology in mobile hydrogen applications including associated infrastructure with the aim of creating recommendations for measuring devices2022Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    The purpose of this master thesis is to point out where pressure and temperature measuring devices can be implemented in the hydrogen production, supply chain, storage system, refuelling station and in a hydrogen vehicle. For this reason, a basic knowledge for hydrogen as a chemical element and energy carrier in a vehicle has to be gained. Moreover, production methods, storage systems and the supply chain of hydrogen are described.

    It has been shown that in order to ensure safe and stable processes it is indispensable to measure pressure and temperature in the entire hydrogen chain from the production right through to the energy conversion in a vehicle. On the basis of these results, the requirements and type approval processes of measuring devices in mobile hydrogen applications including associated refuelling stations are analysedto ensure a safe and reliable market entry for manufacturers. Special attention will be paid to possible challenges while measuring state sizes of hydrogen.

    It has turned out that the European main standard EC79/2009 that regulates requirements and type approvals of components in mobile hydrogen applications will be repealed in July 2022. To find an adequate alternate standard, the American regulation HGV 3.1 is analysed in regards to commonalities and differences to EC79/2009. The result of the comparison is that in terms of type approvals for components in compressed gaseous mobile hydrogen applications HGV 3.1 scopes most of the relevant contents of EC79/2009 and can therefore be used as an alternative. However, when it comes to components for liquid hydrogen contact in mobile hydrogen applications there are no alternatives to the European standard. For this reason, until the gap is closed by a new international standard, manufacturers for components with liquid hydrogen contact have to refer to certain requirements of EC79/2009 but approve products according to valid regulations like HGV 3.1.

    Finally, the analysis of requirements and type approvals for components used in refuelling stations according to ISO 19880-1 showed that close arrangements between customer and manufacturer is indispensable to ensure a smooth process.

  • 3.
    Chamoun, Michael
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Investigating of HDPE & PET materials useability in electric cabling ducts for the car industry2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    A research study to evaluate if the materials HDPE & PET are suitable as cabling ducts for the automotive industry. The cabling ducts will be used in places such as the engine compartment and inside the body of the car. The research study was ordered from Lear Corporation. Lear Corporation uses today a material that is called Polyamide 66 and they wanted the student to find out if it was possible to use either HDPE or PET instead. The reason why Lear wanted it is because the previous report that students from University West did for Lear Corporation shows that the material PET looked surprisingly well. Now Lear wanted to dig in more into depth and see if it was possible to use PET as material for the cabling ducts. Lear choose HDPE also because they wanted the student to compare those two materials and to see if any of those will suit in as cabling ducts. 

    Both HDPE and PET are recyclable and environmentally friendly, and the properties (mechanical and thermal) was good. The only reason why HDPE and PET would not work is because they are highly flammable and burns fast. If flame retardant material is mixed with either HDPE or PET, then it will not be recyclable.

    The study was completely based on facts and the student have used different databases as well as student literature and previous reports. 

    The result showed that the material that Lear Corporation uses today is the most suitable for the combustion chamber and PET suits the rest of the car. Both are recyclable and the process method which is injection molding suits perfectly for PET and polyamide 66. 

  • 4.
    Chatzigiannakou, Maria Angeliki
    et al.
    Uppsala University, Dept. of Electrical Engineering, Uppsala, Sweden.
    Potapenko, Tatiana
    Uppsala University, Dept. of Electrical Engineering, Uppsala, Sweden.
    Ekergård, Boel
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik.
    Temiz, Irina
    Uppsala University, Dept. of Electrical Engineering, Uppsala, Sweden.
    Numerical analysis of an Uppsala University WEC deployment by a barge for different sea states2020Inngår i: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 205, artikkel-id 107287Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wave energy converters (WECs) have been deployed onshore, nearshore, and offshore to convert ocean wave movement into electricity. The exploitation of renewable energy sources has restrictions; in the case of wave energy, high installation, maintenance, and decommissioning costs have limited their commercial use. Moreover, these offshore operations can be compromised by safety issues. This paper draws attention to offshore operation safety of a WEC developed by Uppsala University. Specifically, this paper investigates what sea states are suitable for the safe deployment of a WEC from a barge. This study follows recommendations in DNV-RP-H103 for analysis of offshore operations, namely lifting through the wave zone. ANSYS Aqwa is used to find hydrodynamic forces acting on a typical barge, using frequency domain analysis. Based on these hydrodynamic simulation results and methodology given in DNV-RP-H103, tables are created to show the sea states that would allow for the safe installation of a WEC using a typical barge. Considered sea states have significant wave heights varying between 0 m and 3 m and the wave zero crossing periods varying between 3 s and 13 s. The WEC submersions are considered between 0 m and 7 m, i.e. when the WEC is in the air until it is fully submerged. © 2020 Elsevier Ltd

  • 5.
    De Backer, Jeroen
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Soron, Mikael
    ESAB Welding AB .
    Ilar, Torbjörn
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för process- och produktutveckling.
    Friction stir welding with robot for light vehicle design2010Inngår i: Proceedings from the 8th International Friction Stir Welding Symposium: Timmendorfer Strand, Germany 18-20 May 2010, The Welding Institute , 2010Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Reducing weight is one of the enablers to design more environmentally friendly vehicles. Friction Stir Welding (FSW) supports low weight design through its capability to join different combinations of light weight materials, e.g. different aluminium alloys, but also through its possibilities in producing continuous joints. StiRoLight is a recently started project for robotised FSW for joining of light weight materials emphasising on the vehicle industry, an industry with a long-time experience of robotic welding. The first task involves investigation of force feedback for maintaining the desired contact force. Another important aspect in robotised FSW is the compliance of the robot, which may result in deviations from the pre-programmed path as a result of the high process forces experienced during the welding operation. The further exploration of three-dimensional FSW seams and definition of the process windows will be part of further research within this project.

  • 6.
    Korsbo, Andreas
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik.
    Woxvold Bjönness, Egil
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik.
    Analys av kvalitetsproblemen på rear quarter panel stationen hos Volvo Cars i Torslanda2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Studien fokuserar på tillverkningen av Volvo v90. Mer specifikt monteringen av en expander runt tanklocket. Monteringen sker på rear quarter panel stationen och det finns ett kvalitetsproblem där. Den manuella monteringen görs inte rätt varje gång och detta leder till problem framöver i produktionen. Studiens syfte är att ta fram fler förslag till motåtgärder och förbättringar.

    Med hjälp av ett uppbyggt teoretiskt ramverk i form av andra vetenskapliga artiklar har ett flertal förslag tagits fram. Tre nya tekniker, några ändringar med Lean som riktlinjer och ett förslag till designändring beskrivs vidare i texten. Vidare ges även förslag på hur Volvo Cars kan arbeta vidare med förbättringsförslagen i framtiden för att upprätthålla hög kvalité.

    De metoder som används för att ta fram förslagen till motåtgärder är DMAIC, intervju, observation och en litteraturstudie. En analys genomförs för att utvärdera huruvida förslagen är försvarbara eller inte. Inget om själva implementeringen i verkligheten kommer att finnas med i rapporten

    Fulltekst (pdf)
    fulltext
  • 7.
    Martinez Armendariz, Carlos
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Thermal and electrical design of a high power electrical distribution box: Consequences of air bubbles in thermal interface materials regarding electrical insulation and heat dissipation out of the power distribution box of an electric vehicle2022Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Thermal interface materials (TIM) are widely used in the automotive industry due to its capacity to transfer the heat and to ensure the electrical insulation between electronic parts and the cooling system. In this thesis, a liquid TIM is studied. The main concern when usinga liquid TIM is about the consequences if air bubbles appear inside the material when it is being applied and its resulting impact on the electrical insulation. This situation has been studied and is presented in this thesis.

    Related to the electrical insulation, different tests were done using an insulator tester. Different setups were mounted and tested from 500 V to 10000 V to find the breakdown voltage point of each setup. The main conclusion was that even if just one air bubble appears, the effective thickness of the whole TIM would be reduced to the initial thickness of the TIM minus the size of the bubble. That could be catastrophic for the whole system because the electrical insulation could be broken.

    Meanwhile, the same setups and material combinations were also tested to check the thermal conductivity capacity of the system

    Since it is not feasible to control the location and size of the possible air bubbles, an electrically insulator film (EIF) was used as a backup in case that the TIM failed as an insulator due to the presence of air bubbles. Using the EIF allows the reduction of the total thickness of the TIM by half, improving the heat transfer of the whole system and ensuring the electrical insulation.

  • 8.
    McCarthy, Philip
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Investigation into active short circuit tolerant motor design and its impact on power density of EV traction motors2022Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    This report investigates the design of traction motors for electric vehicles to reduce the amplitude of the current produced during a three-phase short circuit of the machine. The report focuses on surface-mounted permanent magnet machines with concentrated windings. The changes in the three-phase short circuit are compared to other performance benchmarks such as peak torque, peak power, torque density and power density.

    This project found that, for a given set of boundary conditions, the performance of the motor will be reduced at the cost of lower three-phase short circuit currents. As the motor design is modified to reduce the short circuit current, the machine becomes limited by temperature and DC supply voltage. These findings achieve the goal of this project which is to quantify the compromise between low three-phase short-circuit current and performance.

  • 9.
    Piccitto, Andrea Federico
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Experimental validation of a brake feeling control algorithm for an EV2022Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Automotive testing is a crucial and time-demanding step that every automotive OEM must undergo to deploy reliable and safe new products on the global market. Meccanica42, an Italian automotive test company, has developed a prototype electric vehicle that can be used to test OEM’s new components directly on a vehicle so that a remarkable amount of time can be saved by cutting down the time spent on static, off-vehicle tests. Meccanica42 is now working on a novel control algorithm that can simulate the feeling of an ordinary brake system to be deployed in the electric prototype vehicle’s brake-by-wire system.

    This Thesis work focuses on the development of a Simscape plant model that has been used to test the novel control algorithm before it is deployed in the prototype. The plant model has been only partially validated against experimental tests on a custom test bench since the global shortage of electronic components did not allow to build the complete test bench.

    Finally, different tests have been done on the control algorithm once it has been hooked up to the partially validated plant model. The tests mainly underlined that the algorithm could be improved by including in itself the brushless DC motor driver instead of relying on third-party drivers to control the DC motor. The tests showed a possible instability at high frequency above 2 Hz that needs to be investigated.

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