变速超空泡航行体壳结构的动力响应分析

Dynamic response of shell structures of supercavitating vehicles in variable speed motion

通过对变速超空泡水下航行体壳结构受力模型的分析,建立了恒定推力下航行体的平面运动方程,确定了变速过程中的阻力和冲击力。利用有限元方法,进行了结构响应计算,分析了减速过程中节点时域上的最大应力值在轴向的分布情况及典型节点处的响应。结果表明:航行体所需推力和所受应力较大,对其结构强度要求较高;运动过程中,节点时域上的最大应力在空间域上的极大值主要分布在首尾端部和柱壳中部;存在一些振动频率对航行体结构响应影响显著。结果对超空泡航行体壳结构受力和强度分析以及优化设计有着重要的指导意义。

Analyzing the load model of shell structures of a supercavitating underwater vehicle in variable speed motion, the equations of plane motion of the vehicle under a constant thrust load were deduced. The resistance and impact forces were gained. The structural response was calculated with the finite element method. Axial distribution of the maximum stress in time domain and the dynamic responses of several typical nodes were studied when the vehicle was decelerating. The resuhs indicated that the thrust force and the stress of the vehicle are great, and it needs a great structural strength ; the maximal values in spatial domain of the maximal stress in time domain of the vehicle in motion are located at the tip, tail of the body and the middle of the cylindrical shell; several frequencies have a great effect on the structural response. These results were helpful for structure force and strength analysis and optimal design of supercavitating vehicles.