|
|
Design of suspension for an electric off-road motorcycle
Hlaváč, Pavel ; Hejtmánek, Petr (referee) ; Míša, Jiří (advisor)
This master thesis deals with the design of suspension for an electric off-road motorcycle. The aim is to determine the optimum damping force and spring stiffnesses for a motorcycle with given parameters for different rider weights. Some input parameters had to be measured, such as tire stiffness and damping, fork and shock damping of the same type of motorcycle. Other damping forces were created using the measured ones to cover wider range of damping ratios. Then these forces and spring stiffnesses were tested in quarter car and half car models to evaluate the changes in suspension setting on rider comfort a ride safety. Then the ideal damping forces and spring stiffnesses for an electric off-road motorcycle are determined from the simulations performed.
|
|
|
Race car dampers
Štolpa, Radek ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This bachelor thesis aims to provide an overview of manufacturers on the market in the field of sports shock absorbers according to individual disciplines. Furthermore, it describes the effects of the basic adjustment elements of the shock absorber on the dependence of the damping force and the speed of the shock absorber. I tried to create an overview of the special elements used for shock absorber affecting its characteristics. Using a quarter model replacing an off-road vehicle of category T1, I have displayed the effects of changes in individual suspension parameters such as the weight of the sprung and unsprung mass, the damping and stiffness of the tire, the damping coefficient of the shock absorber and the spring stiffness coefficient. Finally, I evaluated the optimal characteristics of the shock absorber with respect to the dynamic force under the vehicle wheel and the acceleration of the sprung mass.
|
|
|
Vehicle Testing on Four Post Test Rig
Egorov, Artemii ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The object of this master thesis is testing of vehicle using four post rig. The main goal is to make a research about testing and tuning vehicle characteristics on four post rig in order to implement them for testing of TU Brno Racing’s Formula Student racecar. The main method of testing, input signals and measurement description are presented in this thesis. The different methods of analysis of testing data to find best tuning of damper and spring stiffness for different race disciplines are described. In the last part of this work, quarter car model and multibody model in MSC Adams Car is created. Input parameters of model are based on measurements from real car/ component testing, including damper characteristics and static tire radial stiffness for best fit with the characteristics of real vehicle. The measurements themselves were also described in separate chapter of this thesis. The last but not the least goal was to compare these simulations with measurements, made od real four post rig in order to decide whether car model is suitable for racecar development.
|
|
|
Vehicle Bumstops and Reboundstops
Mikeš, Josef ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The aim of this master’s thesis is to create a mathematical description of the functioning of vehicle suspension stops. There are two basic types of suspension stops, mechanical and hydraulic. The mechanical one accumulates energy at the end of the suspension stroke, The hydraulic one converts the residual energy into heat. In order to understand the problem of stops, research on the function and current trends in the design of stops is carried out in the first part of the thesis. This work includes an investigation of the effect of stop positioning and stop characteristics on vehicle behaviour. The characterization was investigated by changing of the force ramp intensity and adjusting the global stiffness of the stops. By varying the onset of action of the hydraulic and mechanical stops, there is a position in which the driving characteristics of the car are improved. It is advantageous to use this position in the design of the stops. The result of comparing the different options is a design of suspension stops for a particular vehicle. Due to the action of the hydraulic stop, the damping oil is heated, but by checking the dissipated energy it can be concluded that this heating is quite minimal.
|
|
|
Vehicle Testing on Four Post Test Rig
Egorov, Artemii ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The object of this master thesis is testing of vehicle using four post rig. The main goal is to make a research about testing and tuning vehicle characteristics on four post rig in order to implement them for testing of TU Brno Racing’s Formula Student racecar. The main method of testing, input signals and measurement description are presented in this thesis. The different methods of analysis of testing data to find best tuning of damper and spring stiffness for different race disciplines are described. In the last part of this work, quarter car model and multibody model in MSC Adams Car is created. Input parameters of model are based on measurements from real car/ component testing, including damper characteristics and static tire radial stiffness for best fit with the characteristics of real vehicle. The measurements themselves were also described in separate chapter of this thesis. The last but not the least goal was to compare these simulations with measurements, made od real four post rig in order to decide whether car model is suitable for racecar development.
|
|
|
Race car dampers
Štolpa, Radek ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This bachelor thesis aims to provide an overview of manufacturers on the market in the field of sports shock absorbers according to individual disciplines. Furthermore, it describes the effects of the basic adjustment elements of the shock absorber on the dependence of the damping force and the speed of the shock absorber. I tried to create an overview of the special elements used for shock absorber affecting its characteristics. Using a quarter model replacing an off-road vehicle of category T1, I have displayed the effects of changes in individual suspension parameters such as the weight of the sprung and unsprung mass, the damping and stiffness of the tire, the damping coefficient of the shock absorber and the spring stiffness coefficient. Finally, I evaluated the optimal characteristics of the shock absorber with respect to the dynamic force under the vehicle wheel and the acceleration of the sprung mass.
|
guest ::
