基于频响函数灵敏度分析的鱼雷模型有限元模型修正

引入试验和有限元模型的频响函数形状和幅值相关系数,推导了频响函数相关系数的灵敏度分析方程,建立了鱼雷模型的结构有限元模型,利用少量试验数据,对初始有限元模型的壳体厚度、弹性模量等参数进行修正,修正后的频响函数相关系数明显提高。鱼雷模型的模态试验结果表明,有限元模型修正后的固有频率计算与试验结果的相对误差小于1.5%,为鱼雷模型振动传递、水下声辐射预报的准确性奠定了基础。

Revising Finite Element Model of Torpedo Model Based on Sensitivity Analysis of Frequency Response Function(FRF)

This paper derives the equations for sensitivity analysis of shape and amplitude correlation coefficient in frequency response function(FRF),and sets up a structure finite element model for torpedo model by introducing test and the FRF correlation coefficients into the finite element model.The original design parameters such as shell thickness and elastic modulus of torpedo model are revised by using a little test data,then the FRF correlation coefficients increase significantly.The modal test result indicates that the calculated natural frequencies are consistent with the tested ones after revising the finite element model,and the relative error is less than 1.5 percent.This model lays the foundation for accurately forecasting vibration transmission and underwater noise radiation.