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Acoustic properties of road markings
Drnovský, Ondřej ; Caudr, Michal (referee) ; Radimský, Michal (advisor)
The thesis deals with verifying the acoustic properties of road markings in real conditions the vehicle travels. It contains basic information about the acoustics of the sources of traffic noise and methods of measuring noise. Below are the main information about the horizontal signposts and its impact on safety. The practical part contains descriptions of results, estimation of measurement and subsequently implemented economic assessment.
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Noise reduction oriented optimization of UAV propellers
Ecler, Matěj ; Matějů, Jiří (referee) ; Popela, Robert (advisor)
This diploma thesis deals with optimization of propellers with the aim to reduce their noise level. Based on the measurement of noise level of serial propellers, major propeller noise sources were evaluated. Subsequent 2D simulations of the flow on the individual profiles along the propeller span revealed the locations of separation bubbles, which were identified as a potential source of the noise. Based on these findings, propellers were equipped with turbulator trips of various dimensions and their effect on the noise level and efficiency of the propellers was experimentally verified. The results did not show contribution of turbulator trips to noise reduction or efficiency.
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Propfan engines in civil aviation transportation
Polák, Andrej ; Klement, Josef (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis is written in the search form and discusses propfan aircraft engines. After introducing the concept itself, the first part deals with the principle functioning of engines and propulsion efficiency. The second part briefly describes the construction of these engines with a focus on specific parts of propfan engines differentiating concept from other aircraft engines. Then summarizes the features of these engines, describes their advantages and disadvantages and the possibilities of eliminating disadvantages. Finally briefly describes the history of the development of propfan engines.
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Noise reduction oriented optimization of UAV propellers
Ecler, Matěj ; Matějů, Jiří (referee) ; Popela, Robert (advisor)
This diploma thesis deals with optimization of propellers with the aim to reduce their noise level. Based on the measurement of noise level of serial propellers, major propeller noise sources were evaluated. Subsequent 2D simulations of the flow on the individual profiles along the propeller span revealed the locations of separation bubbles, which were identified as a potential source of the noise. Based on these findings, propellers were equipped with turbulator trips of various dimensions and their effect on the noise level and efficiency of the propellers was experimentally verified. The results did not show contribution of turbulator trips to noise reduction or efficiency.
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Acoustic properties of road markings
Drnovský, Ondřej ; Caudr, Michal (referee) ; Radimský, Michal (advisor)
The thesis deals with verifying the acoustic properties of road markings in real conditions the vehicle travels. It contains basic information about the acoustics of the sources of traffic noise and methods of measuring noise. Below are the main information about the horizontal signposts and its impact on safety. The practical part contains descriptions of results, estimation of measurement and subsequently implemented economic assessment.
|
|
|
Propfan engines in civil aviation transportation
Polák, Andrej ; Klement, Josef (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis is written in the search form and discusses propfan aircraft engines. After introducing the concept itself, the first part deals with the principle functioning of engines and propulsion efficiency. The second part briefly describes the construction of these engines with a focus on specific parts of propfan engines differentiating concept from other aircraft engines. Then summarizes the features of these engines, describes their advantages and disadvantages and the possibilities of eliminating disadvantages. Finally briefly describes the history of the development of propfan engines.
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|
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Propfan engines in civil aviation transportation
Polák, Andrej ; Klement, Josef (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis is written in the search form and discusses propfan aircraft engines. After introducing the concept itself, the first part deals with the principle functioning of engines and propulsion efficiency. The second part briefly describes the construction of these engines with a focus on specific parts of propfan engines differentiating concept from other aircraft engines. Then summarizes the features of these engines, describes their advantages and disadvantages and the possibilities of eliminating disadvantages. Finally briefly describes the history of the development of propfan engines.
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