阻振质量对板平面弯曲波传播的阻抑

研究了无限板上受点激励时阻振质量对结构声传递的阻抑,采用基于能量观点的隔振度来定义阻振质量的阻抑作用.通过理论分析验证了隔振度简化公式的可行性.发现板平面弯曲波分别和阻振质量的弯曲波和扭转波达到最佳耦合时,平面弯曲波发生最大透射.算例分析和试验研究论证了理论分析的正确性,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.

Attenuation of the Plate Flexural Wave Transmission Through a Vibration Isolation Mass

Vibration isolation mass attenuating transmission of the plate flexural wave is analyzed with the force excitation applied on an infinite plate.The effect of attenuation is quantified by vibration isolation degree based on the energy standpoint.The feasibility of approximate formula for vibration isolation degree is verified by a theory analysis.The maximum transmission of the plate flexural waves through the vibration isolation mass is found to occur at the resonance frequencies corresponding to the optimal coupling between the plate flexural waves and the flexural and torsional waves in the vibration isolation mass.The numerical analysis and experimental study show the correctness of the theory analysis.The study provides a theoretical and experimental basis for the vibration isolation mass applying to structure-borne sound propagation control.