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Experimental Invest...
Experimental Investigation of Sound Power Radiation From Partly Open Enclosure With Numerous Interior Objects
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- Lindberg, Eskil, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Andersson, Patrik, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2007
- 2007
- Engelska.
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Ingår i: 19th International Congress on Acoustics, Madrid, 2007.
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- The radiated sound power from an engine of a passenger car is highly dependent on the acoustical properties of the engine bay. The engine bay is a densely packed and partly open enclose where standard room acoustics models do not directly apply. It has a complex geometry of numerous accessory parts, cables, pipes, screens, and absorbers that all together affect the wave field and the radiated sound power. Radiated sound power from a simplified hardware model has been measured for various configurations of interior objects. The measurements have been preformed in an anechoic environment using a reciprocal technique where source and receiver positions are interchanged. The results show a clear tendency with higher reduction of the radiated sound power at higher frequencies as the number of objects isincreased. There is a reduction of about 10 dB at higher frequencies when 10% of the empty volume is filled with objects. Screens partly covering openings are needed in the modal range to get a significant reduction. Differences in sound radiation between specific source positions show clear variations. Models combining deterministic and statistical approaches are needed to cover the local behaviour in a wide frequency range.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)