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A source reconstruction process based on an indirect variational boundary element formulation
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DOI：10.1016/S0955-7997(00)00064-3.png)
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摘要
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The objective of the work presented in this paper is the development of a computational capability for recreating the vibration of a source from acoustic field data. The formulation is based on the indirect variational boundary element method (IVBEM). The vibration of the source is computed from transfer functions defined between the field points, where the acoustic pressure of the original field is prescribed, and the surface of the source. The IVBEM is employed for deriving the transfer functions. The capability to account for the presence of obstacles in the field adjacent to the vibrating sources is included in the source reconstruction process. Treatment of irregular frequencies is included in the IVBEM formulation employed in this work and the reconstruction of the source can be achieved for all radiation conditions. A singular value decomposition (SVD) solver is integrated with the IVBEM computations in order to evaluate the vibration of the source from the transfer functions and the acoustic field data. An algorithm that identifies the optimum field points where the acoustic pressure of the original field must be prescribed in order to accomplish the most efficient source reconstruction is also developed. The optimum held points are selected from a set of prescribed candidate points. The selection of the optimum points is based on the geometric characteristics of the source, the frequency of analysis, the locations of the candidate points, and the properties of the medium. There is no need to have information about the acoustic field in order to identify the optimum field points, Several validation and application cases are presented. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword:
indirect boundary element method
noise source reconstruction
irregular frequencies
optimum point selection
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