复合材料水下壳体不确定性振声特性研究OA

The existing studies mostly focus on the deterministic analysis of the vibroacoustic response of underwater composite shells,but the structure,material,and heavy fluid parameters in actual engineering are uncertain.Therefore,this paper presented an efficient prediction method based on interval analysis and a Kriging agent model,which is suitable for the analysis of uncertain vibroacoustic responses for composite laminated stepped cylindrical shells in a heavy fluid environment.The research object was a composite laminated stepped cylindrical shell immersed in an infinite domain heavy fluid.Based on the first-order shear deformation theory,energy method,and Kirchhoff-Helmholtz integral,a vibroacoustic coupled model was established.The interval analysis method was introduced to describe the parameter fluctuation.The Kriging agent model was used to replace the time-consuming boundary element operation.The influence of various uncertain parameters on the sound pressure level response of the composite laminated stepped cylindrical shell was studied.On this basis,the offset law of the response curve with respect to variations in the values of the uncertain parameters that have a significant influence was analyzed.The results show that the multi-source uncertainty causes significant frequency shift and response fluctuation range widening.The proposed method effectively solves the problem of uncertain vibro-acoustic analysis for complex stepped structures in heavy fluid environments,and provides technical support for the acoustic robustness design of underwater composite structures.