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Effect of Shock Absorber on Vehicle Limits
Jurka, Adam ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The aim of this master’s thesis is to evaluate the effect of shock absorber on vehicle limits. At the beginning of the thesis, shock absorber properties were described. Then computational model was created and manoeuvres for shock absorber behaviour were defined. Created mathematical model is based on quarter model of a car and excitation in form of road with a random profile is an essential part of the model. This model was used for evaluation of heave. After heave analysis, shock absorber behaviour during drive was investigated. Drive conditions were defined as set of handling manoeuvres. For the drive investigation, complete multibody virtual model of racing car was used. Based on drive investigation analysis, optimal damping characteristics for each manoeuvre were found. Furthermore, each optimal characteristic was compared for different manoeuvres. Obtained results were compared. As a conclusion, compromise damping characteristic was suggested with the aim to fit the combination of all defined drive conditions. Final part of the thesis was aimed at validation of the computational model. Data measured during real drive were used as an input for this validation.
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Quadbike (ATV) Driving Behaviour
Příplatová, Miroslava ; Krejsa, Ivan (referee) ; Semela, Marek (advisor)
This thesis deals with Quadbike (ATV) driving behaviour. This work describes the construction of ATVs, driving behavior and specifications ride them. In this work was performed measurements of braking, acceleration tests, measurements of transverse movement ATVs and subsequent analyse of obtained data. The measured values can be used for working forensic experts and analysts accidents.
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Design of Formula Student chassis
Zubíček, David ; Blaťák, Ondřej (referee) ; Porteš, Petr (advisor)
Diploma thesis deals with comparison of different types of tyres destined for Formula Student vehicle. Comparison is from view of chosen characteristics and from view of simulations for one lap. Thesis deals with kinematics design of suspension according to chosen tyre and according to improvement of car ability of monopost Dragon 6
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Comparison of Vehicle Handling Characteristics
Kalábová, Barbora ; Semela, Marek (referee) ; Vémola, Aleš (advisor)
This thesis deals with the analysis of the car driving characteristics depending on the type of drive wheels. The first chapter defines the basic theoretical cars concept as well as procedures for determining the individual variables needed to identify the driving dynamics of vehicles. The practical part describes the plan and the progress of realized measurements on a selected pattern of vehicles, and the measured values are interpreted. The final part deals with the evaluation of the performed measurements and the data identified within these measurements.
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Suspension Systems of Commercial Vehicles
Němeček, Vojtěch ; Dlugoš, Jozef (referee) ; Fojtášek, Jan (advisor)
This thesis follows up suspensions of lorry types. Thesis contains comprehensive overview of all commonly manufactured springs and shock-absorbers. Thesis is divides into five main parts. The first chapter is about oscillations, quality of suspensions and about other points connected to this theory. The second chapter has detailed overview of main types of suspensions. All types of currently used suspensions are listed, including coil suspensions, leaf suspensions, air suspensions and also shock-absorbers. The third chapter combine suspensions on different types of axles with their structure. The fourth chapter contains future of suspensions and electronic systems. In the conclusion is mentioned subjective evaluation of different types of vehicles
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Influence of Aerodynamics on Vehicle Handling Performance
Hejtmánek, Petr ; Kaplan, Zdeněk (referee) ; Dundálek, Radim (referee) ; Píštěk, Václav (advisor)
The main aim of this dissertation was to develop a computational tool capable of evaluating the influence of aerodynamics on the handling of a vehicle. The methodology it uses is based on the simulation of driving manoeuvres with a single-track model of a vehicle, which was composed with an emphasis on minimizing the amount of necessary input parameters. This simple model, which allows the assessment of the influence of aerodynamics on vehicle dynamic and static driveability, therefore doesn’t require large amount of input data, which makes the acquirement of relevant values easier. The computational model was validated by extensive measurements of two driving manoeuvres defined by ISO norms (step steer input and steady state cornering). As a consequence of unsatisfactory initial validation results, the differences between measurements and simulations were analysed, which led to gradual enhancements of the model with additional inputs to achieve better accuracy of simulations. The final part of the thesis deals with the comparison of influences of individual aerodynamic parameters on vehicle handling and the assessment of overall significance of aerodynamics compared to other factors which were taken into account (tires, mass properties, steering etc.). This thesis was realized in close cooperation with Škoda-Auto.
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Computational Analysis of Vehicle Handling
Doležal, Kamil ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The diploma thesis deals with computational analysis of driving behavior of a vehicle. The first section summarizes and explains the basic parameters of steering geometry. Next section covers the tests which are used to study driving behavior of vehicles. The practical part consists of computational model that is able to simulate and evaluate tests of step steer input.
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Computational Model and Analysis of Vehicle Driving Dynamics
Mrázek, František ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
The bachelor's thesis deals with the creation of a computational model and analysis of vehicle dynamics in connection with the principles and rules that are closely related to vehicle dynamics. We will use the key physical phenomena related to the driving dynamics of the model vehicle, suitable for modeling and analysis. The model will demonstrate the driving dynamics of vehicles in several appropriately selected situations and creates the possibility to compare the results with data obtained from freely available publications and tests.
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Bicycle suspension test stations
Volánka, Lukáš ; Růžička, Bronislav (referee) ; Mazůrek, Ivan (advisor)
This work deals with the design of a bicycle suspension testing station. Currently, new suspension technologies are still being developed, especially for mountain bikes, which are intended for very rough terrain. For this development of new technologies, it is necessary to have a suitable station that enables experimental verification of driving characteristics, ideally in laboratory conditions. The key features that can be evaluated in a bike are riding comfort and grip. The designed station uses a cylindrical road simulator placed under the tested suspension (wheel). Speed bumps are placed on the cylinder of the simulator, which excite vibrations in the bike when passed over, which simulates driving on a bumpy road. At the station, it is possible to evaluate the properties of the front and rear suspension, while the bicycle is always clamped to the station by the axis of the untested suspension. During the tests, the riders weight is replaced by additional weights placed on a rack that connects the seat and head tube of the bike. The additional weights can be moved to imitate different positions of the cyclist while riding. A virtual dynamic model was created for the test station, which makes the experiments much more efficient. The simulation model was designed and tested in MSC Adams software. The test station together with the virtual model forms a simple tool that enables quick and efficient testing of the quality of bicycle suspension.
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