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Development of the Exhaust System Radiation Noise Simulation Technology Using Exhaust Pulsation

Article of Honda R&D Technical Review Vol.14 No.2

Summary

The purpose of this paper is to propose a simulation method using Finite Element Model in order to predict exhaust radiation noise. This newly developed method predicts the radiation noise in a sound field located away from the vibrating surface of structure by coupling calculation between fluid exhaust gas and exhaust parts. By applying measurement values to boundary conditions, accurate radiation noise from the exhaust system is obtained, and the noise causing parts and the mechanism are clarified. This method allows for the investigation of exhaust radiation noise at an early stage in development. Also, the accuracy of measurement values using boundary conditions is improved by introducing semiconductor pressure sensors with 1-MHz sampling and a laser Doppler velocimeter. Furthermore, the measurement results showed the existence of a shock wave during an exhaust pulsation.

Reference

(1) Iwamoto, J.: Example and Drill-Compressible fluid dynamics, Tokyo, Kyoritsu Shuppan Co., Ltd., p. 156 (1980)
(2) Takekawa, H., Yoshida, N.: FFT processing on random data of exhaust gas flow pulsation, Ono Sokki Technical Report, No. 14, pp.45-49 (2001)
(3) Donea, J.: Arbitrary Lagrangian-Eulerian Finite Elements Methods, Computational Methods in Transient Analysis, Vol. 1, No. 10 (1983)
(4) Perie, F., Nakagawa, H., Yoshimoto, H., Sakurai, M., Yoshida, N., Fukui, Y.: Prediction of Aeroacoustic Noise in Exhaust Systems, The 29th FISITA World Automotive Congress, F02E150 (2002)
(5) Endo, M., Iwamoto, J.: Numerical analysis of pulsatile jet from exhaust pipe, JSAE Review, Vol. 20, No. 2, pp. 243-249 (1999)

Author (organization or company)

Hiroshi NAKAGAWA(Tochigi R&D Center)、Hideyuki YOSHIMOTO (Tochigi R&D Center)、Masaki ENDO(Tokyo Denki University)、Yuji SHIRAHIGE(Tochigi R&D Center)、Masamichi FUJISHIRO(Tochigi R&D Center)、Masato SAKURAI(Tochigi R&D Center)

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