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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.
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The Use of Inerter in Vehicle Design
Lanzendörfer, Tomáš ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This diploma thesis deals with the inerter application in vehicle’s suspension. The aim was to perform a theoretical analysis of its features, to compare its construction layouts, to create a multibody model of the car’s suspension and to analyse inerter’s effects while performing different driving manoeuvres. All analyses were performed by MSC Adams View software with a little support from Matlab. The quality of ride comfort and accessible traction force were increased by the inerter almost in every case, and dynamic load of the suspension was also decreased in some cases. The inerter is a device with high potential, but with high purchase costs as well, so further development and practical research is necessary.
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On-road Diagnostic of Vehicle Damper
Vaněk, Vojtěch ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The diploma thesis deals with the analysis of the effects of shock absorber wear on the driving dynamics of the vehicle. Furthermore, a quarter model of the car was created in the Simulink software, where a procedure for evaluating the condition of the shock absorber while driving the vehicle was created. This procedure was subsequently validated on real measured data from the Hummer H3 car.
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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.
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Regenerative Shock Absorber
Jirků, Filip ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
When car is driven on bumpy road, then suspension is continuously vibrating. Energy of vibration is absorbed by shock absorber, which improves comfort and car handling. Thesis is investigating possibility of using vibration energy to gain elektricity on designed concept.
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Computational Analysis of Electric Car Ride
Procházka, Vojtěch ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The topic of bachelor thesis is the suspension of electric vehicles and its comparison with conventional cars. The research part describes properties of electric vehicles and their influence on the design. The increase in their total weight due to batteries and chassis solutions is being investigated especially. The next section is focused on electric motors, especially electric in-wheel motors, which represent a significant increase in unsprung mass. The next chapter describes the effect of suspension and its importance in terms of driving comfort and safety. In the computational part, the influence of the increased sprung and unsprung masses, which were defined in the search, is analyzed using the quarter car model in the MATLAB program. These results are evaluated in conclusion.
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Experimental Identification of Road Profile
Baroš, Martin ; Vančura, Jan (referee) ; Hejtmánek, Petr (advisor)
The diploma thesis focuses especially on a design of a way for evaluating roughness in road profile, which affects driving characteristics of a car and a ride. In the theoretical part of the thesis are mentioned the most used methods and tools for road roughness analysis in the world. For the purposes of this thesis an experimental measuring were undertaken in order to obtain data for the own design of a road profile analysing system.
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The use of air springs for race car
Blažek, Jakub ; Zháňal, Lubor (referee) ; Porteš, Petr (advisor)
This diploma thesis studies the use of air springs for race car, precisely Formula Student race car. Research part of the thesis deals with choosing suitable air spring for given application. In practical part, there is computation of parameters for appropriate setting of air spring, so it will comply with the rules of Formula Student. There is also simulation of air spring functionality in real use.
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