Wave propagation in a waveguide with continuous right-angled corners: Numerical simulations and experiment measurements |
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Authors: | Wuzhou Yu Xu WangRui Wu Jiangling YuZaixiu Jiang Dongxing Mao |
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Institution: | Institute of Acoustics, Tongji University, No. 1239 Siping Road, Shanghai 200092, China |
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Abstract: | This paper studied the acoustic wave propagation in a waveguide with continuous right-angled corners, with emphasis on the effect brought by the distance between the corners. The numerical analyses showed that at middle to high frequencies, the transmission loss (TL) of a multi-cornered waveguide was 2–5 dB higher than that of single-cornered and varied with frequency. To explain the performance at peaks and dips in the TL curve, analyses on eigenmodes and sound intensity distribution were conducted. The performance of multi-cornered waveguides was experimentally investigated, which fit well with the numerical results. The present study indicates that, for a waveguide with continuous corners, its acoustic performance is not simply a “summation” of two individual single-cornered ones. Both the standing wave modes and the evanescent modes between the corners lead to its complicated frequency performance. |
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Keywords: | Waveguide Right-angled corners Eigenmode Sound intensity distribution |
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