実験モード解析による振動性状の検討と効果周波数の推定 : 錘つき遮音板の設計手法に関する研究その1

概要

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Previous studies show that the attachment of small weights to a thin steel plate improves the sound insulation at low-frequency range. The characteristic of sound insulation board is that the spacing between weights can control the tuning of effective frequency of sound insulation. This mechanism is useful for the noise control. This paper examines the sound insulation characteristics and the mode of vibration plate in the Experimental Modal Analysis. Results in this paper are as follows. 1)The natural frequencies at divided areas are different the basis of various conditions of the spacing between weights and the support. 2)The weights are vibrating at the effective frequency of sound insulation. 3)The plate above the effective frequency is under the stiffness control at each divided area. The one below the effective frequency is under the inertia control at one plate. Finally this paper suggests an estimation method of the effective frequency by Mechanical impedance.
社団法人日本建築学会の論文
2002-08-30