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.
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. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(10): 218-224.
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