水下拖曳绳索在随机脉动压力作用下的响应

水下拖曳绳索的不规则运动影响兵器诸多特性。由于绳索表面湍流边界层的随机压力作用, 绳索运动相当复杂。基于绳索的横向振动模型, 利用模态分析理论, 求得了2D随机压力作用下各阶振型上的广义力, 研究了绳索表面随机脉动压力谱, 给出了水下拖曳绳索横向随机振动响应的互谱密度函数以及随机振动响应所产生的运动感应电磁噪声。其结果对于水下通信及水中兵器具有重要的应用价值。

Response of Underwater Towed Cable under Random and Fluctuant Pressure

The performance of underwater weapon is influenced by the irregular movememts of underwater towed cable.Because of the random pressure in the turbulent boundary-layer of the cable surface,the movements of the cable are very complex.Based on the model of the transverse vibration of the cable and the theory of modal analysis,the generalized force of all orders under 2D random pressure is obtained,and the spectra of random and fluctuant pressure on the cable surface is studied.Furthermore,the cross relation spectra density of the random transverse vibration response of the underwater towed cable and the motion-induced electromagnetic noise caused by the random vibration response are calculated.