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Study of Method to Reduce Low-frequency Noise by Controlling Panel Vibration Phase

Article of Honda R&D Technical Review Vol.19 No.1

Summary

A method of reducing the sound pressure of low frequency noises such as booming and drumming noise was devised by focusing on the phase relation between multiple panel vibrations. Low frequency noise is affected by the acoustic modes, which are determined by the shape and the size of the cabin. Accordingly, an advantageous panel phase relation was clarified for the sound pressure inside the cabin in the low frequency region, and a method of realizing this phase relation by means of the distribution of the panel resonance frequencies was invented.
Also, technology for performing BEM analysis in the low frequency region was established. The sound pressure in the cabin was predicted according to the boundary conditions obtained from the measurement results, and the contribution of each panel was clarified. From these results, the multiple panel resonant frequencies of a completed vehicle were adjusted, and the necessary phase relation for canceling the sound pressure was realized, thus the sound pressure was reduced.

Reference

(1) Yamauchi, H., Seino, H., Yasuda, K.: Experimental and Theoretical Study of a Structural-Acoustic Coupling System, Transactions of The Japan Society of Mechanical Engineers, Vol. 71, p. 39-46 (2005)
(2) Iwama, A.: Development of Experimental Modal Analysis Method for Structural and Acoustic Coupling System, Transactions of Society of Automotive Engineers of Japan, Vol. 24, p. 108-112 (1993)
(3) Tanimoto, R., Ninomiya, O., Asakura, T.: Booming Noise Reduction by Vibration Control of Back Door in a One-Box Car, Transactions of The Japan Society of Mechanical Engineers, Vol. 68-668, p. 131-136 (2002)
(4) Imanishi, Y., Hasegawa, T., Mitsuhashi, T., Koyano, S.: Analysis of Sound Field in a Car by Boundary Element Method and Measurement, 2005 JSAE Annual Congress Proceedings, No. 72-05, p. 25-28 (2005)

Author (organization or company)

Takashi KONDO(Automobile R&D Center)、Akira SUTO(Automobile R&D Center)、Hiroyuki YASUDA(Automobile R&D Center)

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