STUDY ON A DIFFUSE INDEX OF PLATE VIBRATION IN AUDIO-FREQUENCY RANGE AND ITS UTILIZATION : Part 2 Evaluation of vibration response using diffuse index

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  • HASHIMOTO Norihisa
    Dept. of Architecture, Faculty of Engineering, Hachinohe Institute of Technology

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  • 拡散度指数による板の振動応答の評価 : 板振動の拡散度評価指標の構成とその利用に関する研究 その2
  • カクサンド シスウ ニ ヨル イタ ノ シンドウ オウトウ ノ ヒョウカ イタ シンドウ ノ カクサンド ヒョウカ シヒョウ ノ コウセイ ト ソノ リヨウ ニ カンスル ケンキュウ ソノ 2

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Abstract

In a preceding paper, a constituting method of a diffuse index of plate vibrations in audio-frequencies has been defined and was confirmed to be proper. In a present paper, an evaluation method using the diffuse index on the vibration response of arbitrary flat plates is shown. As results of numerical study, the followings are clear. Though vibration response changes by various conditions (aria, thickness, boundary condition, vibration damping, and so on), that characteristic is represented as a single regression function by arranging based on the diffuse index regardless of those plate conditions. In addition, the diffuse index can be approximately inferred due to a number of natural frequencies in an octave band. These findings are useful for the evaluation of the structure-borne sound such as floor impact sound.

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