多个阻振质量阻抑结构声的传递

Impediment to Structure-Borne Sound Propagation from Several Paralleling Arranged Vibration Isolation Mass

采用波动分析法对平行排列的多个阻振质量阻抑结构声传递的机理作了探讨 ,研究了无限板上受点激励时阻振质量对平面弯曲振动波传递的阻抑 ,推导了多个阻振质量对平面弯曲波传递的阻抑公式 ,并分析了平面弯曲波传递时形成的穿透频段和堵塞频段 .数值计算分析和试验研究结果表明 ,多个阻振质量对结构声的传递具有良好的阻抑效果 ,为阻振质量应用于结构声传递途径的控制提供了理论和试验基础 .

The mechanism that several paralleling arranged vibration isolation mass impedes structure borne propagation with wave analysis method was discussed. The vibration isolation mass impeding propagation of plane bending waves was studied with the force excitation applied on an infinite plate. The formula of the impeding plane bending wave transmission was obtained. The stopping bands and passing bands were analyzed when the bending wave propagates on built-up structure. It is shown that the impeding effect is very good from numerical computation analysis and experimental study. The study provides a theoretical and experimental basis for the vibration mass applying to structure-borne sound propagation.