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Noise associated with the rail wheel
Mareš, Adam ; Řehák, Kamil (referee) ; Rec, Matouš (advisor)
The issue of noise associated with rail transport, focusing primarily on noise from the wheel – rail contact, is examined mainly in connection with rail transport, but also concerns tram transport in cities and, to a lesser extent, funicular railways. The noise of rail transport is one of the reasons why it is perceived negatively by the public, even though it offers many advantages over other modes of transport, such as environmental friendliness, travel comfort, travel speed and more. This is one of the reasons why it is necessary to focus on noise in rail transport and to understand, research and further develop and improve the whole issue as well, both in the area of passive and active noise control measures. For this reason, the aim of this work is to provide a comprehensive overview of the issue. The work therefore deals with the issue of noise in a comprehensive way, from the theoretical definition of noise, through noise sources and their distribution to noise measurement and the use of numerical methods for its evaluation and determination of appropriate preventive and anti-noise measures.
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Acoustics of small fans
Hájková, Lenka ; Rubina, Aleš (referee) ; Cifrinec, Ivan (referee) ; Hirš, Jiří (advisor)
Dissertation thesis falls within area of indoor climate and deals with investigation of acoustic microclimate in sanitary rooms of residential buildings during a mechanical ventilation. Sources of a noise in these areas are small fans. The thesis contains the evaluation of the existing situation concerning the referred issue, physical laws of acoustics and theoretical basics of acoustics of air conditioning. The part of the thesis is experimental measurement which aims to evaluate the situation in real applications and the possibility of influencing the acoustic microclimate by affixing of small fans on the building structure. The work contains a model for the verification of certain anticipated dependencies and theoretical investigation of the distribution of sound pressure levels in the sanitary room, depending on the location of the noise source. The last part of the work offers possible measures to improve the acoustic microclimate and elimination of the noise in sanitary rooms and in protected areas of residential buildings.
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Civic amenities building
Svoboda, David ; Pilný, Ondřej (referee) ; Berková, Petra (advisor)
The aim of the master’s thesis is the design of a new music club building in Valtice. The first part of the thesis is the architectural and structural design. The building of irregular rectangular shape with one underground floor and two above-ground floors is divided into two main operational units – a dance hall and a rock club. The chosen structural system is reinforced concrete columns with locally supported floors. The walls are made of sand-lime blocks. The main insulation material is hemp. The building is covered by a flat roof with extensive greenery. The second part deals with the building services. Ventilation, heating and cooling are provided by HVAC units. The heat source is condensing gas boilers, the cooling source is an outdoor VRV cooling unit. The third part of the master‘s thesis is the acoustic assessment of the building. As a noise source, it mainly addresses the acoustic impact on the surrounding buildings in the vicinity. Furthermore, it optimizes the reverberation time in the rock club. The project was produced in accordance with the legal regulations and technical standards and created in AutoCAD software.
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Noise reducing of aircraft engines
Čirka, Martin ; Kaddour, Mirvat (referee) ; Šplíchal, Miroslav (advisor)
Nowadays, aircraft transportation influences everyday life in our society, but not only by its advantages of efective traveling, but also by its negative impact on environment, therefore us, people. Due to this reason, I decided to concern myself about noise reducing of aircraft engines in this thesis. Research in this field helps to develop comfort of traveling, but also very important fact is noise impact on people living in surroundings near airports. To understand problem to the roots, first we need to know how is noise actually defined. First part of my bachelor’s thesis contains describtion of sound and noise. I’m also focusing on methods for noise measurement and actions, which are used for noise reduction. Greatest success have been made with Variable Geometry Chevrons, which can adjust to different flying conditions and not just reduce noise, but also can keep thrust of the engine at the same level and is also reducing fuel consumtion during level flight. In fourth chapter, you’ll come to know about regulations, which were made to adopt standards and recommended practices concerning aircraft polution. Also very important factor for setting up new standards is process of aircraft testing, so I summed up principles and procedures, which are usedby aviation organizations.
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Noise associated with the rail wheel
Mareš, Adam ; Řehák, Kamil (referee) ; Rec, Matouš (advisor)
The issue of noise associated with rail transport, focusing primarily on noise from the wheel – rail contact, is examined mainly in connection with rail transport, but also concerns tram transport in cities and, to a lesser extent, funicular railways. The noise of rail transport is one of the reasons why it is perceived negatively by the public, even though it offers many advantages over other modes of transport, such as environmental friendliness, travel comfort, travel speed and more. This is one of the reasons why it is necessary to focus on noise in rail transport and to understand, research and further develop and improve the whole issue as well, both in the area of passive and active noise control measures. For this reason, the aim of this work is to provide a comprehensive overview of the issue. The work therefore deals with the issue of noise in a comprehensive way, from the theoretical definition of noise, through noise sources and their distribution to noise measurement and the use of numerical methods for its evaluation and determination of appropriate preventive and anti-noise measures.
|
|
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Civic amenities building
Svoboda, David ; Pilný, Ondřej (referee) ; Berková, Petra (advisor)
The aim of the master’s thesis is the design of a new music club building in Valtice. The first part of the thesis is the architectural and structural design. The building of irregular rectangular shape with one underground floor and two above-ground floors is divided into two main operational units – a dance hall and a rock club. The chosen structural system is reinforced concrete columns with locally supported floors. The walls are made of sand-lime blocks. The main insulation material is hemp. The building is covered by a flat roof with extensive greenery. The second part deals with the building services. Ventilation, heating and cooling are provided by HVAC units. The heat source is condensing gas boilers, the cooling source is an outdoor VRV cooling unit. The third part of the master‘s thesis is the acoustic assessment of the building. As a noise source, it mainly addresses the acoustic impact on the surrounding buildings in the vicinity. Furthermore, it optimizes the reverberation time in the rock club. The project was produced in accordance with the legal regulations and technical standards and created in AutoCAD software.
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Measurement of Noise During Rainwater Flow Through the Roof Drain Body
Fučík, David ; Ručka, Jan
The article deals with the issue of measuring the flow and noise that arises in the vicinity of the siphonic drainage system during the outflow of rainwater from the roof surface. Rainwater is drained from the roof level through roof drains, which are fitted into vertical penetrations in the roof structure. The article describes the basic issues of flow and noise measurement, which refers to technical standards and other literature. According to the given requirements, the parameters of several siphonic roof drains from various manufacturers will be measured. Subsequently, the measured data will be compared and evaluated.
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Acoustics of small fans
Hájková, Lenka ; Rubina, Aleš (referee) ; Cifrinec, Ivan (referee) ; Hirš, Jiří (advisor)
Dissertation thesis falls within area of indoor climate and deals with investigation of acoustic microclimate in sanitary rooms of residential buildings during a mechanical ventilation. Sources of a noise in these areas are small fans. The thesis contains the evaluation of the existing situation concerning the referred issue, physical laws of acoustics and theoretical basics of acoustics of air conditioning. The part of the thesis is experimental measurement which aims to evaluate the situation in real applications and the possibility of influencing the acoustic microclimate by affixing of small fans on the building structure. The work contains a model for the verification of certain anticipated dependencies and theoretical investigation of the distribution of sound pressure levels in the sanitary room, depending on the location of the noise source. The last part of the work offers possible measures to improve the acoustic microclimate and elimination of the noise in sanitary rooms and in protected areas of residential buildings.
|
|
|
Noise reducing of aircraft engines
Čirka, Martin ; Kaddour, Mirvat (referee) ; Šplíchal, Miroslav (advisor)
Nowadays, aircraft transportation influences everyday life in our society, but not only by its advantages of efective traveling, but also by its negative impact on environment, therefore us, people. Due to this reason, I decided to concern myself about noise reducing of aircraft engines in this thesis. Research in this field helps to develop comfort of traveling, but also very important fact is noise impact on people living in surroundings near airports. To understand problem to the roots, first we need to know how is noise actually defined. First part of my bachelor’s thesis contains describtion of sound and noise. I’m also focusing on methods for noise measurement and actions, which are used for noise reduction. Greatest success have been made with Variable Geometry Chevrons, which can adjust to different flying conditions and not just reduce noise, but also can keep thrust of the engine at the same level and is also reducing fuel consumtion during level flight. In fourth chapter, you’ll come to know about regulations, which were made to adopt standards and recommended practices concerning aircraft polution. Also very important factor for setting up new standards is process of aircraft testing, so I summed up principles and procedures, which are usedby aviation organizations.
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