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Study of Radiation Noise for Motorcycle Engines

Article of Honda R&D Technical Review Vol.18 No.1

Summary

In reducing the noises emitted by a motorcycle during acceleration, it is very important to reduce the noise radiated from the engine. To reduce engine noise radiation, we have developed an engine-noise-radiation analysis system. In analyzing engine-noise radiation, vibration analysis techniques appropriate for the high frequencies of the engine case and covers, a technique for estimating the excitation force input into the engine, and an analysis technique to assess acoustic output from the measured engine surface vibrations, are required. After overcoming all technical obstacles, our newly-developed system allows assessment of the noise radiation characteristics of motorcycle engines. The above-mentioned analysis method has been applied to reduce noise radiation from an inline four-cylinder motorcycle engine. The reduction of engine noises during acceleration has been confirmed from a modified engine.

Reference

(1) Sakaguchi, K., Saitou, K.: Development of a Prediction Method for Evaluation of Transmission Case Noise Radiation Characteristics, Honda R&D Technical Review, Vol. 17, No. 1, p. 42-45
(2) Kuwahara, H., Fukui, Y.: Connector Modeling in Vibration Prediction for Motorcycles, Honda R&D Technical Review, Vol. 13, No. 2, p. 167-174
(3) Sumi, K., Yamamoto, K., Gielen L.: Development of Hybrid Model for Powerplant Vibration, SAE 1999-01-1656
(4) Sakai, T., Terada, M., Ono, S., Kamimura, N.: Development of a Procedure for Interior Noise Estimation by Virtual Vehicle Analysis, Honda R&D Technical Review, Vol. 13, No. 2, p. 195-204

Author (organization or company)

Hiroyuki KUWAHARA(Asaka R&D Center)、Hidetaka MIKI(Asaka R&D Center)

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