一种特殊动力吸振器阻抑结构声传递特性分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (10) : 218-224.

论文

林永水1,2 吴卫国1，甘进1

作者信息 +

A new method for solving problems about impeding structure-borne sound transmission from a special dynamic vibration absorber

LIN Yongshui1,2 WU Weiguo1 GAN Jin1

Author information +

文章历史 +

摘要

结构声传递控制一直是舰船结构声学设计需要解决的关键问题。动力吸振器是一种重要的波阻技术，具有很好的频段选择性，在舰船的应用日益广泛。针对动力吸振器阻抑板的结构声传递问题，提出了精细的波分析模型和波动力响应矩阵法。将结构离散为多个波导单元和波阻单元，建立附加动力吸振器的结构连接的广义波动力响应平衡方程，推导出波导单元的波动力响应特征矩阵及动力吸振器的附加波动响应特征矩阵，并代入平衡方程求解得到波导单元的振动幅值，从而求得传递效率与损失。数值研究表明动力吸振器在特定频段具有很好的波阻效果，并探讨了动力吸振器设计参数对其波阻特性的影响。研究为动力吸振器的声学设计提供了新的分析方法，在舰船减振降噪中具有重要的理论意义与工程应用价值。

Abstract

The control of structure-borne sound transmission is a key problem to be solved in acoustic design of marine structure. Dynamic vibration absorber is one of very important wave blocking techniques and has good frequency selectivity, which is widely used in naval ships. A fine theoretical model and wave dynamic response matrix method is put out to investigate the problem of impeding structure-borne sound transmission from dynamic vibration absorber. Firstly, the structure is discreted into many wave guide elements and wave resistance elements and a general wave dynamic response equilibrium equation of the junction is developed. Then, the wave dynamic response matrices of wave guide elements and the added wave dynamic response matrices of wave resistance elements are deduced. The vibration amplitudes of wave elements are obtained by resolving the equilibrium equation and the transmission efficiency and transmission loss are then obtained. The method is illustrated by a series of wave attenuation models with different design parameters. The numerical computation results show that the wave transmission loss of the specific frequency domain will be greatly improved. The research work provides a new analysis method for the acoustic design of dynamic vibration absorber, which has great theoretical significance and is of important value for practical engineering in noise and vibration reduction on board.

导出引用

林永水1,2 吴卫国1，甘进1. 一种特殊动力吸振器阻抑结构声传递特性分析[J]. 振动与冲击, 2016, 35(10): 218-224

LIN Yongshui1,2 WU Weiguo1 GAN Jin1. A new method for solving problems about impeding structure-borne sound transmission from a special dynamic vibration absorber[J]. Journal of Vibration and Shock, 2016, 35(10): 218-224

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