著者

安田 仁彦 神谷 恵輔

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.55, no.515, pp.1609-1615, 1989-07-25 (Released:2008-02-21)

参考文献数

21

被引用文献数

1 1

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As a basis for developing an identification technique of nonlinear distributed systems based on their dynamical responses, an identification technique is proposed based on a simple example of nonlinear distributed systems. The example taken up is a simply supported beam vibrating with large amplitudes. The basic procedures of the proposed technique are: (1) measuring periodic responses of the beam to periodic excitations; (2) determining modal coordinates using the responses based on the modal functions of the corresponding linear beam; and (3) determining the modal equations including nonlinear terms using the principle of harmonic balance. Some numerical examples are given, and the technique proposed is shown to be applicable.

著者

谷本 隆一 朝倉 孝征 今井 守之 鶴見 康昭 安田 仁彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.69, no.686, pp.2550-2555, 2003

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In recent years one-box-cars are very popular in the market. So their interior noise level is required to be the same as that of passenger cars. To find an effective way to reduce the noise level, we studied why the noise level is high in a one-box-car as compared with a passenger car. We found that, because the diesel engine is placed under the front passenger seat, only narrow space is allowed between the engine and the engine cover, and this narrow space amplifies the noise. We confirmed by numerical simulation that this conclusion is appropriate. Based on the conclusion, we proposed to set up a silencer to lower the noise level, and found that it works effectively.