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Development of a Vibration Prediction Technique for Automobile Exhaust Systems

Article of Honda R&D Technical Review Vol.12 No.2

Summary

A simulation technique that uses a finite element model for predicting vibration in the exhaust system was developed. The shapes of the flexible tube portions of the flexible joints, or vibration absorption joints, were faithfully modeled and the characteristics of the other parts were assigned numerical values. An accurate model of the ball joints was obtained by assigning numerical values to the dynamic properties of gaskets. The vibration force of the engine, which is the input for this system, was obtained using the sum of the inertial forces of the component parts and the rotational reaction force produced by cylinder combustion pressure. This made it possible to quantitatively predict the forces transmitted to the body from the exhaust hangers and to qualitatively understand exhaust system behavior. This in turn makes it possible to study the optimal locations for the exhaust hangers and the vibration absorption joints in the pre-development stages.

Reference

(1) Akio Nagamatsu: Modal Analysis, Tokyo, Baifuukan, p307 (1993) (Written in Japanese).
(2) Noboru Miura, Mizuho Fukuda: 4.4 Analysis of Vehicle Noise and Vibration, Automobile Design and Analysis Simulation, Tokyo, Baifuukan, p207-253 (1990) (Written in Japanese).
(3) Atsushi Watari: Machine Dynamics, Tokyo, Kyouritsu-Shuppan, p225 (1991) (Written in Japanese).
(4) Okuzumi Hiroshi: Identification of the Rigid Body Characteristics of a Powerplant Using Experimentally Obtained Transfer Functions, Nissan Technical Review, p10-14 (1990) (Written in Japanese).

Author (organization or company)

Hiroshi NAKAGAWA(Tochigi R&D Center)、Hidekazu AKIYAMA(Tochigi R&D Center)、Kazutoshi YUKI(Tochigi R&D Center)、Hideyuki YOSHIMOTO (Tochigi R&D Center)、Masato SAKURAI(Tochigi R&D Center)

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