Examensarbeten för kandidatexamen // Bachelor Theses
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- PostAlternative powertrain. Hybridization of Formula Student car.(2012) Martin, Strängberg; Hermansson, Fredrik; Holder, Martin; Petersson, Carl; Stenman, David; Winqvist, Håkan; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied MechanicsThis report investigates the hybridization of a formula student powertrain. It starts by studying different existing solutions and technologies and continues with describing the result of this project. All decisions are driven by data and well-grounded in calculations, experiences in former Chalmers Formula Student (CFS) cars, simulations and the Formula student rules (Rules 2012). The powertrain will be a parallel hybrid with a single cylinder engine of 600 cc since its weight is much lower than the current four cylinder engine, a Yamaha Fazer. An electric machine with its sprocket on the final drive chain will be used. It will also act as a chain tensioner. The electric energy will be stored in super capacitors because of their high power per weight relation. For this application high power has higher priority than high energy content. A GT Power model of the engine has been created and delivers data for making assumptions about the predicted power of the vehicle with a single cylinder engine. Regenerative braking will be applied in order to use the braking energy for acceleration when required. All components of the powertrain will be controlled by components by National Instruments and Nira using CAN communication. The components have been packaged virtually in the CFS-10 frame, since the frame of the actual car where this powertrain is intended to be mounted is not yet built.
- PostCHABOT A Humanoid Robot for Educational and Exhibitional Purposes(2014) Dankis, Karin; Davidsson, Alexander; Hardselius, Erik; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied MechanicsThe CHABOT project entailed the construction of a humanoid robot torso. The robot was to be used in the master program course TIF160 Humanoid Robotics as a laboratory material to be utilized in student group projects. The robot was given the name CHABOT by the customer together with a specified list of functional requirements and a request of an aesthetically pleasing exterior. The main goal of the design was to provide an expandable platform that could be altered with additional functions in the future. This was achieved by using a CAN bus for communication and a combination of 3D printed parts, metal plates and threaded rods creating the supportive skeletal structure. A USB connection between the robot and a computer, allows students to control the entire structure. A polycarbonate plastic shell was crafted to create an engaging and attractive appearance. The final CHABOT prototype fulfilled the stated goals of being both modular, re-creatable and aesthetically pleasing.
- PostDesign of electrical powertrain for Chalmers Formula Student with focus on 4WD versus RWD and regenerative braking(2013) Danielsson, Oskar; Hansson, Erik; Jonsson, Isak; Mannerhagen, Felix; Molander, Patrik; Olofsson, Niklas; Pettersson, Jens; Pluto, Adam; Sahlin, Gunnar; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied MechanicsThis thesis describes the design of an electric powertrain for a Formula Student race car. The main focus is the comparison of RWD versus 4WD and to investigate the possibilities to use regenerative braking and torque vectoring. 2014 will be the first time that Chalmers Formula Student team will compete with an electricly powered vehicle; this thesis gives guidelines for the design. Models of the vehicle dynamics are set up to investigate the differences between RWD and 4WD. From the longitudinal dynamics model the maximum possible acceleration is calcualted which is of great importance for a race car. This model also sets the requirements for the motors and gearings. The lateral dynamics investigates the performance of the car in cornering. The advantages in using a torque vectoring system are studied. The vertical dynamics models give data about the affect of having higher unsprung mass, which in-wheel motors will cause. From these models it is evident that major advantages can be gained by using 4WD. More traction, and thus better acceleration, is gained when the tire grip of all four wheels is used. It is also possible to implement a more powerful torque vectoring system when the driving force of all four wheels can be controlled. A torque vectoring algorithm were implemented on a RC-car to be able to evaluate the concept and control algorithms. Calculations on the regenerative braking show how much energy efficiency that can be gained. The calculations also show the large benefit of combining 4WD and regenerative braking. The most important powertrain components such as batteries, motors, gears and motor controller are investigated. Recommendations of components types and important design parameters are presented.
- PostKonstruera och bygga en autoklav för härdning av kompositer i Chalmers kompositverkstad(2018) Bredenberg, Tobias; Karlsson, Johan; Holmberg, Fredrik; Barreng, Petter; Forsström, Birk; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime SciencesFör att fortsätta försörja arbetsmarknaden med nyutexaminerade studenter från Chalmers och göra nya framsteg inom forskning krävs utveckling. Arbetet uppnår detta genom att konstruera en autoklav till maskinhusets kompositverkstad. I det första skedet används systematisk utvecklingsmetodik för att kunna ta fram koncept. Sedan genomfördes dimensionering av autoklaven med hjälp av handberäkningar på hållfastheten och uppvärmningsystemet. Följt av detta gjordes modellering med hjälp av CATIA v5, där modellerna sedan användes för simuleringar i finita elementprogrammet ANSYS 18.2. Dimensioneringen av reglersystemet genomfördes med hjälp av simuleringar i systemdesignsprogrammet Simulink. Med hjälp av dessa verktyg har gruppen tagit fram en konstruktion med tillhörande ritningar och komponenter. De huvudsakliga komponenterna är ett tryckkärl med dimensionerna ?508 × 1190 mm, ett reglersystem baserat på en Raspberry Pi 3+ och ett uppvärmningssystem med maximal effekt på 2, 3 kW. Autoklaven är dimensionerad för arbetstrycket 0, 7 MPa och högsta temperaturen 150 C. Styrsystemet visar när autoklaven är i drift och stänger av vid eventuella fel. Om styrsystemet skulle haverera finns en mekanisk övertrycksventil som försäkrar om att trycket släpps ut. Abstract To keep the supply of alumnae going from Chalmers and to make new research possible innovation is needed. This project achieves this through the design of an autoclave intended to be used in Chalmers new composite workshop. In the first phase of the project a systematic development method was used. In the next phase the product was designed with tools like basic calculations of the structural integrity and the heating system. Then models were made in CATIA v5 and simulated with the finite element method in ANSYS 18.2. A model for the control system was developed and simulated in the system design program Simulink. With the help of these tools the project group has made a complete design with blueprints and components. The major components are; a pressure vessel with the dimensions ?508 × 1190 mm, a Raspberry Pi 3+ based control system and a heating system with the maximal active power 2, 3 kW. The autoclave is designed for a working pressure of 0.7 MPa and maximal temperature of 150 C. The control system indicates when the autoclave is in use and shuts down when any errors occur. If the control system where to malfunction a mechanical pressure valve guarantees safety by releasing the air. The report is written in Swedish.