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  • 1.
    Andersson, Rasmus
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    CAE Tool for Evaluation of Park Lock Mechanism in a DCT Transmission2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A park lock mechanism is a device that is fitted to an automatic transmission on a vehicle. The mechanism lock up the transmission so that no rolling of the vehicle can be done when the vehicle is put in the park position.

    The aim of this thesis is to develop a method in order the evaluate designs on a Park Lock Mechanism (PLM) that can be found in a dual clutch transmission (DCT).

    A Computer Aided Engineering (CAE) tool to calculate the output that is required for an evaluation of a park lock mechanism design will be created. The CAE tool shall calculate static, dynamic, and snap torque on a ratchet wheel in a gradient, with or without a trailer, also the minimum and maximum coefficient of friction between the pawl and cone, pull out force, the maximum amount of rollback, torque needed from the return spring, preload force from actuator spring, and engagement speed.

    The CAE tool created uses an Excel Visual Basics for Applications (VBA) workbook for all calculations. The tool allows the user to choose different vehicles with the required specification to evaluate the values for that PLM.

    The CAE tool will save time and cost if lots of different PLM’s are going to be designed. The CAE tool has potential for future work when more calculations can be added that can be in use for the evaluation the PLM.

    The CAE tool developed by the master thesis student calculates all the required values for evaluation of a PLM design, executed in a fast, efficient, and easy to use program. 

  • 2.
    Brauer, Samuel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    High Speed Electric Vehicle Transmission: Investigation how noise vibration harshness are affected at high speeds in an electric vehicle transmission2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 3.
    Eriksson, Lars
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Social and Psychological Studies (from 2013).
    Age, cognitive load, and multimodal effects on driver response to directional warning2019In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 76, p. 147-154Article in journal (Refereed)
    Abstract [en]

    Inattention can be considered a primary cause of vehicular accidents or crashes, and in-car warning signals are applied to alert the driver to take action even in automated vehicles. Because of age related decline of the older driver's abilities, in-car warning signals may need adjustment to the older driver. We therefore investigated the effects of uni-, bi- and trimodal directional warnings (i.e., light, sound, vibration) on young and older drivers' responses in a driving simulator. A young group of 15 drivers (20-25 years of age) and an older group of 16 drivers (65-79 years of age) participated. In the simulations, warning signal was presented at the left, the center, or the right in front of the participant. With a warning at the left, the center, and the right the correct response was to steer to the right, brake, and steer to the left, respectively. The main results showed the older drivers' responses were slower for each type of warning compared with the young drivers' responses. Overall, the responses were slower with an added cognitively loading task. The only multimodal type of warning inducing overall faster response than its constituent warning types was the vibration-sound, and only for the older drivers. Additionally, with the groups' responses collapsed, such a true multimodal effect on response time also showed for the center vibration-sound warning (i.e., braking response). The only multimodal warning showing clear reduction in response errors compared with its constituent warning types was the vibration-sound for the older drivers during extra cognitive load. The main conclusion is that older drivers can benefit from bimodal warning, as compared with unimodal, in terms of faster and more accurate response. The potential superiority of trimodal warning is nevertheless argued.

  • 4.
    Jonsson, Alexander
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    Design of a trim- and tilt suspension system for a diesel driven outboard engine2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis has been done at the company MarineDiesel Sweden, which is currently developing a diesel-powered outboard engine. The focus of the thesis is to design and size a trim/tilt-suspension unit, which secures the outboard to the boat. This system allows adjustments to be done to the outboard while driving in order to achieve better performance and a smoother ride.The methods used in this thesis are brainstorming/concept generation, concept selection, load analyses, CAD-modeling and FEM-analyses. One concept was chosen to proceed with, and further development was carried out. This involved design loops due to feedback from the company as well as the results from the FEM-analyses.The final result is a complete suspension unit, modeled and calculated strength wise, in order for it to fulfill the demands set on it. Four major parts were investigated using FEM, and analyzed in order to keep the stresses low as well as eliminating unnecessary material and thereby reducing weight. The material selected is aluminum, which is lightweight and possible to cast in order to produce complex geometries.

  • 5.
    Lindqvist, Tobias
    Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
    Analys och utformning av fordonschassi2016Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The thesis was preformed for Precer in Karlstad and it´s a part of the program for graduate engineers in mechanical engineering at the University of Karlstad. The employer Precer Autotech offers technical solutions for the production of electricity through clean combustion of various types of solid fuels. The technology is adaptable for use as a recharge source in different types of hybrid vehicles as well as for production of electricity for homes and cottages. Precer Autotech, in collaboration with the European Space Agency (ESA), has developed new types of fuels and powertrains and is currently in the process of bringing these into an environmental friendly concept vehicle. The dissertations purpose is to develop a frame for a concept vehicle, which is driven by this new type of driveline. The results from the study show a model of a frame for this concept vehicle and evaluations around the torsion stiffness of the frame. Material proposal will also be discussed in the report.

  • 6.
    Ryberg, Sebastian
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    Driver Chassis Control Functions in New Vehicles: Based on Steering, Suspension, and Propulsion Actuators2017Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The thesis project is performed at ÅF Industry at their chassis department in Trollhättan, where their focus lay at chassis and body functions for the automotive industry. There are many functions in a car now a day, the act and function names for those functions have a huge variety between automotive brands. ÅF want a catalogue, with a collection of functions and what they do, how they act, pros and cons, and in- & output, with focus on steering, propulsion, and suspension actuators. 

     

    Through benchmarking, all functions have been collected in a list of functions for five different automotive brands. Another student from Karlstad University, worked parallel with a similar thesis, focusing on braking actuators. Some information passed through our theses to help each other during the benchmark. From the benchmark, five datasheets were made, to add to the catalogue. Out of those five functions one had to pass the elimination matrix to be tested and evaluated.

     

    In this thesis, the function to be tested were Drive Profile with focus on suspension. The function was tested in a Saab 9-5 Aero equipped with an VBOX 3i at NEVS test track. Test method for the test was ISO 3888-2 severe lane-change, obstacle avoidance. The result for the test was that Sport profile was stiffer than Comfort and Intelligent, and therefore recovered the roll rate much quicker in hard cornering. The profile to choose, while entry a hard cornering is the Sport profile because of the fast roll rate recovery, also the steering torque felt way better for the driver with the Sport profile activated.

     

     

    It is concluded that it is a problem with all variety of function names. Especial for customer who wants to compare cars when he/she is going to buy a new car. 

  • 7.
    Tågerud, Jonatan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    Konceptförslag till förarmiljö: Formspråk och utvalda reglage i estetisk och kognitiv ergonomisk tappning2015Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    A product development project that deal with the problem of how a driver environment's design language, controls, and the combination of these to a greater extent can be designed in a cognitive ergonomic and aesthetic way related to the brand.

    The project was carried out a comprehensive study of contemporary operator environments where several clear trends were detected. In parallel course was conducted a cognitive ergonomic case study together with literature that secured the work in shaping technology for humans. The project has immersed in the aesthetic principles and various studies on driver environments have been treated.

    The development concept consisted of three phases. Initially a wide range of comprehensive design language was developed. Then they were put aside to design the actuators. Finally the resulting design with actuators combined into a whole which an end concept was chosen from.

    The project leads to design documentation through form-language, steering wheel and center controls for a driving environment. Design documentation with feedback to the brand, audience, cognitive ergonomics and aesthetics.

  • 8.
    Warmland, Eric
    et al.
    Karlstad University, Faculty of Technology and Science.
    Adamsson, Ola
    Karlstad University, Faculty of Technology and Science.
    Mätprocessen kring propelleraxlar2010Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    A discussion regarding the alignment and measuring procedure of propeller shafts has arose due to the competing situation in the industry, and higher standards from the customers. An estimation of the deflection of shafts in different alignment situations has been made with help of FEM-analysis and beam theory. This has been analyzed and compared with the experience from Rolls-Royce AB suppliers of shafts. An evaluation of measuring protocols has been made and the result indicates that there is a correlation between the deflection of the shaft and the run out. Results from a measuring test performed by Balino, Spain, verifies this conclusion. But the main issue is considered to be the type of supports that prevent the shaft from moving in the horizontal plane. The solution to this issue is to use supports along the shaft that only prevents the deflection in the median plane.

     

    A recommendation to the Rolls-Royce AB is to perform changes in their measuring protocols to make them easier to use and to include more information. The sequence of the measuring points in the protocol should be re-arranged and re-named. Information of what type of support that has been used by the supplier and where they been placed should be added to the protocols to increase the traceability when questions arise. To make the measuring protocol unequivocal, the position of the measuring gauge should be marked in the protocol and the point of reference marked on the shaft.

     

    External expertise will participate in a workshop to educate and discuss with Rolls-Royce AB personnel how to change required references in the drawing of the shaft arrangements.

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