【摘要】 在修正Timoshenko梁基础上,采用传递矩阵法推导了水下结构推进轴系简化模型的传递矩阵,实现各轴承位置处振动功率流的求解。以各轴承位置处传递功率流作为优化目标,选择三组不同的优化方案,取艉轴前后轴承刚度、推力轴承刚度以及轴承间距为优化变量对推进轴系参数进行优化。利用三维水弹性力学理论和三维水弹性声学分析软件,计算分析不同优化结果下水下结构的声源级曲线。结果表明:以艉轴后轴承、艉轴前轴承和推力轴承各处传递功率流最小为优化目标的优化方案最有利于减小水下结构的声辐射。更多还原

【Abstract】 The expression of field transfer matrix of a ship propulsion shafting was deduced based on the modified Timoshenko beam theory and the transfer matrix method. The power flow at each bearing of the propulsion shafting was solved numerically. The propulsion shafting parameters were optimized with three different optimization schemes by selecting the aft stern shaft bearing stiffness,front stern shaft bearing stiffness,thrust bearing stiffness and bearing spacing length as optimization design variables and selecting the sum of the power flows at each bearing of the propulsion shafting as an optimization objective. The three-dimensional sono-elastical theory and acoustic analysis software were applied to analyze the sound source level curve of the underwater structure in the light of the optimization results of different schemes. The analysis results show that the acoustic radiation of the underwater structure is smallest when adopting the optimization scheme that the power flow at each bearing of the propulsion shafting is minimal.更多还原