Vibration Responses Analysis and Experimental Verification of Metallic Thin-walled Structures to Thermal-acoustic Loadings
SHA Yun-dong1, Wang Jian1, Luo Li1, Zhao Feng-tong1, Jia Qiu-yue1
1.Shenyang Aerospace University, Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems, Shenyang, 110136
Abstract：For nonlinear vibration response problems of aerospace thin-walled structures under thermal-acoustic excitations, based on the theory of structural-acoustic coupling, the coupled FEM/BEM method was used to calculate dynamic responses of super-alloy thin-wall rectangular plates with four edges clamped. Researches were mainly focused on the influence of progressive wave and diffused acoustic field on the vibration stress/strain responses of thin-walled structures, the effects of temperature rising on vibration responses of structures were discussed, and the characteristics of thermal-buckling and snap-through of thin-walled structures were analyzed. By comparing simulation results of vibration modals and dynamic strain responses of thin-walled structures in different temperatures with experimental results of thermal-acoustic excitations, it shows that fundamental frequencies and changing trend with the increase of temperature of structures keep a preferable consistency with test results, and strain responses of calculation and experimental results have a good alignment, validating the effectiveness of calculation method and model to thermal-acoustic responses. The calculation method of thin-walled structures nonlinear vibration responses and analysis conclusions presented in this paper will provide references to further carry out thermal-acoustic fatigue life prediction and the dynamic strength design of thin-walled structures.
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