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Prediction models for the acoustic p...

Wong, Hon Yiu.

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Prediction models for the acoustic performance of noise barriers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Prediction models for the acoustic performance of noise barriers./
作者:	Wong, Hon Yiu.
面頁冊數:	323 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0253.
Contained By:	Dissertation Abstracts International65-01B.
標題:	Physics, Acoustics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119837
ISBN:	0496672218

Prediction models for the acoustic performance of noise barriers.
Wong, Hon Yiu.

Prediction models for the acoustic performance of noise barriers. - 323 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0253.

Thesis (Ph.D.)--Hong Kong Polytechnic University (People's Republic of China), 2004.

Noise barriers are the common acoustic measures which are used to minimize the disturbance of traffic noise to residents. It is essential to have an accurate prediction scheme for barrier designs. The main objectives in this thesis are to develop prediction schemes for present barrier problems provided that the prediction schemes shall have a good balance between prediction accuracy and computational efficiency.

ISBN: 0496672218Subjects--Topical Terms:

1019086
Physics, Acoustics.

Prediction models for the acoustic performance of noise barriers.
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100 1 $a Wong, Hon Yiu. $3 1928191
245 1 0 $a Prediction models for the acoustic performance of noise barriers.
300 $a 323 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0253.
500 $a Supervisor: Kai Ming Li.
502 $a Thesis (Ph.D.)--Hong Kong Polytechnic University (People's Republic of China), 2004.
520 $a Noise barriers are the common acoustic measures which are used to minimize the disturbance of traffic noise to residents. It is essential to have an accurate prediction scheme for barrier designs. The main objectives in this thesis are to develop prediction schemes for present barrier problems provided that the prediction schemes shall have a good balance between prediction accuracy and computational efficiency.
520 $a A study of the prediction models for different types of barriers has been investigated. Gaps are found in some new built barriers. The gaps are left in barriers for emergency access and maintenance for instance. The presence of gaps may significantly reduce the overall insertion loss of a barrier. In contrast, small gaps on a barrier are reported as a preferential frequency filters which enhance the insertion loss. However, no simple computational schemes are available to predict the effects of the barrier gaps.
520 $a The first addressed research topic is barrier leakage. An approximate boundary integral method is used to model the barrier leakage problems due to horizontal and vertical gaps. The second research topic is to predict the sound levels behind tilted barriers and cranked barriers of finite length. The theories on sound propagation inside wedge are introduced to approximate boundary integral method for accounting the multiple reflections of sound between the barrier surfaces and the ground surface. It is shown that teeth top barriers can significantly improve the barrier performance. Lastly, an improved scheme of in-situ determination of barrier performance has been developed.
520 $a The theories and formulae proposed in this thesis are validated by conducting indoor experiments in an anechoic chamber, performing full scaled outdoor measurements, and comparing to benchmark numerical schemes. The proposed theories are shown to be accurate and useful to encounter the addressed problems. (Abstract shortened by UMI.)
590 $a School code: 1170.
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Engineering, Civil. $3 783781
690 $a 0986
690 $a 0543
710 2 0 $a Hong Kong Polytechnic University (People's Republic of China). $3 1288341
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Li, Kai Ming, $e advisor
790 $a 1170
791 $a Ph.D.
792 $a 2004
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