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《Acta Physica Sinica》 2008-07
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Analysis of the impact factors on the accuracy of sound field reconstruction based on wave superposition

Li Jia-Qing Chen Jin Yang Chao Jia Wen-Qiang(Research Institute of Vibration Shock & Noise,Shanghai Jiaotong University,Shanghai 200240,China)  
Wave superposition is a numerical method for calculating sound radiation based on the principle of equivalent source. However,the principle does not indicate definitely how to collocate these equivalent sources. So,it is necessary to evaluate its reconstruction accuracy and analyze the impact factors when wave superposition is applied to sound field reconstruction. The purpose of this study is to find some rules for improving the reconstruction accuracy. A number of impact factors on the precision of sound field reconstruction have been analyzed through theoretical analysis and numerical simulation. It has been proved that the equivalent sources have to be collocated inside of a radiator; moreover,it is best for them to conform to the radiator's shape. However,the measurement plane needs not to conform to the radiator's shape,and even does not need to measure in near-field. In addition,it has been shown that Tikhonov and TSVD regularization method can work well with wave superposition when applied to sound field reconstruction. On the basis of these rules,wave superposition can be used to perform better sound field reconstruction; and also its application range can be extended.
【Fund】: 国家自然科学基金(批准号:50675140);; 国家高技术研究发展计划(863)项目(批准号:2006AA04Z175)资助的课题~~
【CateGory Index】: O423
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