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Use of neural networks for estimation of dynamic variables
Dufek, Martin ; Repka, Martin (referee) ; Zháňal, Lubor (advisor)
The aim of the thesis is to verify the applicability of neural networks to predict vehicle dynamic variables. Some vehicle dynamic variables are difficult to measure or need to be calculated, and measuring such quantities can be very expensive. However, If neural networks could predict values with acceptable error, this would be a more affordable and economical method. Verification was performed by creating two recurrent neural networks to estimate the quantities of directional deviation angle and longitudinal forces on all wheels of the car. The paper describes the steps of network creation from processing the input data to evaluating the network predictions. The results show that neural networks can be used to determine dynamic quantities and replace expensive measurements for some purposes. Finally, important insights gained during the creation of neural networks are formulated that can help with the creation of new networks for the estimation of automotive dynamic quantities, and further possible improvements of the created neural networks are outlined.
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Magic Formula tire model
Omasta, Lukáš ; Zháňal, Lubor (referee) ; Straka, Tomáš (advisor)
The goal of this bachelor’s thesis is to conduct a research of modern mathematical models of tires of the Magic Formula type and to determine the input and output parameters influencing these models. The thesis describes the most commonly used Pacejka models and MF-Tire models. Based on the research, a simple model of this type is subsequently created to demonstrate its functionality. The outputs of the model generated from the provided data are presented using graphs and a set of constants for the individual force and moment characteristics.
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Use of an automatic camera system for assembly quality control
Rajnštajn, Jakub ; Hejkrlík, Lukáš (referee) ; Zháňal, Lubor (advisor)
The presented thesis is focused on automation of the assembly quality inspection at the assembly hall M1 in Škoda Auto a.s., Mladá Boleslav. In the first part, the main elements of Industry 4.0 are mentioned, especially artificial intelligence and machine learning, then the project Direct Quality Feedback is introduced, which is a good example of Industry 4.0 in Škoda Auto. The next section shows selected camera-based inspections operating across industrial enterprises. Thereafter, individual locations within the assembly area on the M1 hall, that are potentially suitable for the installation of an automated inspections, are presented, with three of them selected for realization. First of them is wheels inspection, where the solution utilises both hardware and software made by the KEYENCE company. The second case is the inspection of door panels, where the evaluation logic and the individual parts to be inspected have been determined, but till the handover of this thesis, the project wasn’t finalised due to ongoing negotiations over investment and regular overhead costs funding. The last use case is the damper cover inspection, which was chosen to demonstrate a solution that will be easily transferable within the plant and adjustable to another inspection area in a short time frame. This has been implemented in two ways – the first uses Basler's Pylon vTolls software, the second uses MATLAB.
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Construction of a home car simulator
Fous, Michal ; Straka, Tomáš (referee) ; Zháňal, Lubor (advisor)
This thesis deals with game simulators and issues closely related to design. The theoretical part summarizes the components used, the operating principles of individual devices, terms, and knowledge necessary for understanding this area. The next part of the thesis involves the design of the simulator frame and control elements, such as the gear shifter, pedals, and handbrake. The important part of the thesis deals with the design of printed circuits boards and solving problems related to electromagnetic noise generated by an electric motor. The final result is a fully functional prototype of the car simulator.
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Franc, Lukáš ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
This master thesis deals with verifying whether it is possible to determine the external speed characteristic of the engine using sensors in mobile phone. For this verification were made driving tests, during which the driving data were measured with mobile phone. These data were processed in the calculation part in MATLAB. Results were compared with power measurement on chassis dynamometer and with two alternative methods of power measurement.
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Construction of tires
Dlouhý, Filip ; Fojtášek, Jan (referee) ; Zháňal, Lubor (advisor)
The intention of this bachelor’s thesis is a general summary of the function, construction, history, and comparison of tires of individual vehicle categories. The comparison focuses on the functions and uses of tires. It includes an outline of modern trends and future development of tires.
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Construcion of small-serie sport car
Brhel, Štěpán ; Beran, Martin (referee) ; Zháňal, Lubor (advisor)
The object of the bachelor thesis is to create review of used solutions to chassis and bodyschells of small-serie sport cars. Then selection of proper driving units, so engines and gearboxes. Last part considers rules governing connivance of small-serie sport cars for common traffic.
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UTILIZATION OF BIOGAS IN TRANSPORT
Štylárek, Milan ; Zháňal, Lubor (referee) ; Vopařil, Jan (advisor)
Objective of this bachelor thesis is evaluating the possibility of utilization of biogas as an alternative fuel for combustion engines in traffic. Production and distribution of upgraded biogas is described as well as situation of its utilization in the world. This is followed by a comparison of situation in biomethan utilization in Czech republic and Sweden. There are explained barriers to commercial placing and its possible eliminating. In the end the model study of replacement of farm vehicle fleet for CNG vehicles is described.
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The mathematical model of the operating mechanism for turbochargers
Jakubec, Ján ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
The Diploma Thesis is focused to create the mathematical model of operating kinematic model for turbocharger DAVNT (Double Axle Variable Nozzle Turbine) for setting the position of vanes. The work contains a brief overview of supercharge and types of turbochargers. The main part contains a mathematical model which examines the behavior of the mechanism with considering of wear among the parts. It also includes assessment of changing in various parts of the nodes caused by mechanism wear and their influence on the mechanism due to important parameters which characterizes the mechanism. The evaluation is completed by optimizing the parameters. The final section contains the static calculation of internal forces and assessment of actuator position relative to mechanism load.
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Overcharging of combustion engines
Vojtěšek, Aleš ; Vopařil, Jan (referee) ; Zháňal, Lubor (advisor)
This bachelor's thesis deals with outline the history of supercharging and dismantling of several major ways. In particular the use of mechanical supercharging and turbocharging, mentioning its positive and negative sides. Furhetmore, introducing of several versions of the combined supercharging and expected future developments.
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