制振処理による固体伝搬音低減 : ―第1報制振効果の推定法―

概要

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To attain the quietness of vehicle such as automotobiles, ships and airplans, which are mostly composed of plate elements, the reduction of structure-borne noise is important, and for which the damping treatment by using viscoelastic materials is effective. In adoption of this treatemnt, difficult problems are the systematic design of damped structures and the prediction of damping effects, taking the damping material properties into accont. This paper presents a predeiction method of vibration reduction by damping teratment applied viscoelastic materials. The major points of this paper are as follows. 1) To determine the vibratory characteristiscs of damped beams, an iterative desing procedure, taking the temperature and the frequency dependence of damping material properties is taken into acount, is shown. 2) To estimte the vibration reduction by damping teratments, two methods based on both the modal analysis and the SEA method are shown. The former is for the stiffer structures which are characterized with lowmodal density as engine structure, and the latter is for structures of high-modal density. And the estimated results using these methods are well agreed with the measured ones.
社団法人日本マリンエンジニアリング学会の論文