Numerical analysis and test verification for acoustical transmission loss of U-shaped corrugated pipes

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (15) : 90-96.

XUE Fei, SUN Beibei, CHEN Jiandong, JIAO Renqiang

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Abstract

A U-shaped corrugated pipe is a commonly used pipe connection and compensation device. The structural design of corrugated pipes has an important influence on its acoustic transmission characteristics. The numerical calculation model of a U-shaped corrugated pipe was built with the acoustic finite element (FE) method. Its acoustic transmission losses under different structural parameters were computed to obtain influence laws of structural parameters on its acoustic transmission loss. Based on the finite element simulation results, a mathematical model was established to compute the lower and upper cutoff frequencies of the peak frequency band of the pipe’s acoustic transmission loss. A corrugated pipe specimen was designed and fabricated, its acoustic transmission loss was measured using the two-load method, and the test results were compared with the FE simulation ones. The results showed that U-shaped corrugated pipes have a typical band-stop filtering characteristics; corrugation height, corrugation width and its internal diameter are the main factors affecting the lower and upper cutoff frequencies of the peak frequency band of corrugated pipe’s acoustic transmission loss; the error between the computed results of the established mathematical model and the FE simulation results is within ±3.0%; the test results for the U-shaped corrugated pipe’s acoustic transmission loss agree well with the simulation ones, so the correctness and effectiveness of the FE simulation model and the established mathematical model are verified. This study provided a theoretical basis for the acoustical design of U-shaped corrugated pipes, and a new idea for their applications.

Key words

U-shaped corrugated pipes / finite element method / transmission loss / two-load method / mathematical model / band-stop filtering characteristics

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XUE Fei, SUN Beibei, CHEN Jiandong, JIAO Renqiang. Numerical analysis and test verification for acoustical transmission loss of U-shaped corrugated pipes[J]. Journal of Vibration and Shock, 2018, 37(15): 90-96

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