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Noise in the interior of vehicles and methods of reducing it
Patočka, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor thesis focuses on the issues of noise in the interior of vehicles and the methods of subsequent decrease of such noise. Moreover, the thesis shortly describes the most notable sources of noise involved in the overall acoustic within the automobile. The undertaken analysis illustrates that the main source of noise in older vehicles is the combustion engine, an exhaust and intake system, and a gearbox tool. Conversely in modern vehicles, as a result of the unceasing progress of alternative drives, the most notable noise in modern vehicles is the aerodynamic noise and the noise forming out of the contact between tires and roadway. The research showcases that the elimination of these sources is aimed at the use of isolation and absorption structures, as well as the technologically advanced methods such as the ANC method. In relation to the increasing pressure on emission-free traffic, often resulting in insufficient vehicle soundproofing, the thesis summarises the findings concerning the issues of additional vehicle soundproofing.
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Transmission Diagnostics
Zajac, Roman ; Janoušek, Michal (referee) ; Prokop, Aleš (advisor)
The main content of thesis is to describe the diagnostics of vibration and noise arising in the transmission device meant for cars. The document describes the different measuring instru-ments, namely the measured quantities and measuring device.
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Powertrain of a modern electric vehicles
Mraček, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor’s thesis deals with powertrains of modern electric vehicles. The opening part briefly mentions the important historical milestones of electric mobility. The main part of the thesis describes different concepts of powertrain layouts and analyses its main components. The described components are mainly electric motors, batteries, and transmissions. The whole thesis is concluded with comparison of mass–produced electric cars divided into two categories according to the price.
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Flat Plates Vibrations
Zajac, Roman ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The diploma thesis is focused on vibration of the planar plates. It includes the computational and experimental approaches used to determine the mode shapes and frequencies (eigenvalues) of planar plates. This paper compares the analytical, numerical and experimental results of the modal analysis specifically the free-standing rectangular planar plate. The work also encompasses forced oscillation with harmonious excitement as a continuation of the obtained results from modal analysis.
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Powertrain of a modern hybrid vehicles
Novák, Štěpán ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is about the drivetrain in modern hybrid vehicles. It describes the function of a hybrid drivetrain and divides it according to structure, degree of hybridization and placement of the electric motor. It characterizes the design solution of the main components of a hybrid drivetrain. It focuses on the powertrain of selected hybrid vehicles and describes the emissions issue. The conclusion consists of evaluation of the hybrid drivetrain and its vision for the future.
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Noise in the interior of vehicles and methods of reducing it
Patočka, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor thesis focuses on the issues of noise in the interior of vehicles and the methods of subsequent decrease of such noise. Moreover, the thesis shortly describes the most notable sources of noise involved in the overall acoustic within the automobile. The undertaken analysis illustrates that the main source of noise in older vehicles is the combustion engine, an exhaust and intake system, and a gearbox tool. Conversely in modern vehicles, as a result of the unceasing progress of alternative drives, the most notable noise in modern vehicles is the aerodynamic noise and the noise forming out of the contact between tires and roadway. The research showcases that the elimination of these sources is aimed at the use of isolation and absorption structures, as well as the technologically advanced methods such as the ANC method. In relation to the increasing pressure on emission-free traffic, often resulting in insufficient vehicle soundproofing, the thesis summarises the findings concerning the issues of additional vehicle soundproofing.
|
|
|
Powertrain of a modern hybrid vehicles
Novák, Štěpán ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is about the drivetrain in modern hybrid vehicles. It describes the function of a hybrid drivetrain and divides it according to structure, degree of hybridization and placement of the electric motor. It characterizes the design solution of the main components of a hybrid drivetrain. It focuses on the powertrain of selected hybrid vehicles and describes the emissions issue. The conclusion consists of evaluation of the hybrid drivetrain and its vision for the future.
|
|
|
Powertrain of a modern electric vehicles
Mraček, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor’s thesis deals with powertrains of modern electric vehicles. The opening part briefly mentions the important historical milestones of electric mobility. The main part of the thesis describes different concepts of powertrain layouts and analyses its main components. The described components are mainly electric motors, batteries, and transmissions. The whole thesis is concluded with comparison of mass–produced electric cars divided into two categories according to the price.
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