AN IMPROVED ALGORITHM OF MULTI-FREQUENCY PREDICTION IN ACOUSTICAL BOUNDARY ELEMENT METHOD

In the acoustical multi-frequency prediction of boundary elements, plenty of time consumes because of repeated numerical integration per frequency. In order to accelerate the computation, a kind of series expansion method has been proposed. Nonetheless, the results are likely to be inaccurate by this method in case of high frequencies or sound pressure prediction in far field. In this paper, the method is improved by analyzing the application condition and making changes in the frequency-dependent terms, so as to avoid poor precision with small truncated number in a much wider frequency band and far-field prediction. The numerical example of acoustical radiation shows that the improved method is correct and fast, offering theoretical reference and development for the multi-frequency prediction of acoustical boundary element method further.