压阻式矢量水听器声敏感结构的阻尼设计分析

用声学、流体力学理论,结合振动学的理论分析声敏感结构的阻尼特性,找出设计应遵循的一些基本原则。通过声学分析,得出了系统的阻尼与质量振动体的质点振速、阻尼介质参数、质量块的表面积和振动频率有关。对于相同的质量块结构,由于表面积相同,则在空气中的声辐射阻小于在液体中的辐射阻,可以得出质量块在空气中的阻尼系数小于在液体中的阻尼系数的结论,并有声系统中辐射阻的作用与拾振系统中阻尼的作用可以等效的结论。对于一维平动、一维非平动、二维有限平板情况,阻尼系数的表达式具有基本相同的形式,阻尼系数与结构参数有关,与板间距h三次方成反比,与材料的粘滞系数成正比。

The damping designing analysis for sensitive structure of piezoresistance vector hydrophone

The damping characteristic of acoustic senstitive structure is analysed with acoustic theory, hydrodynamics theory and vibration theory. According to the acoustic analysis, the system damping is proportional to the speed of vibrating mass, the permittivity, the surface area of the mass and the frequency of vibration system. When the surface area is the same, the damping coefficient in air is less than the one in liquid, because of the radiation resistance in air is less than in liquid. The acts of the radiation resistance in the acoustic system is equal to damping acts in the vibration system. According to the hydrodynamics theory the equation of damping coefficient is the same style in different situation , and the damping coefficient is concern with medium structure parameter and is proportional to the material sticky coefficient.