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Research on Vibro-acoustic Environment Pridiction of Spacecraft Payload Based on Statistical Energy

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Tutor: ZhaoZuo
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: statistical energy analysis,hybrid FE-SEA method,stiffened panel,vibrationand ac
CLC: V414
Type: Master's thesis
Year:  2012
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Abstract:
Aircraft structures always experience very harsh mechanical environment of soundand vibration in the take-off and high-speed flight section. While the load of the drivingforces have a wide spectral range, which will lead to a high mean square accelerationresponse of the aircraft shell structure with high structure coefficients. Consequently, theeffective load will be under awfully harsh mechanical environments. In addition theworking life and stability of the system will be greatly reduced.To construct accurate models of sound and vibration environment is of greatsignificance for the indication of the sound and vibration response of the carrier rockets¡¯payloads, and for the improvement of the air passengers¡¯ comfort. In this thesis themodeling study is carried out for a stiffened panel which is commonly in project. Thevibro-acoustic response modeling analysis of the carrier rockets¡¯ payloads is carried outbased on the statistical energy method and the FE-SEA hybrid method.The basic concepts of SEA are introduced firstly such as subsystem, modal densityand the loss factor. Then the power flow balance equation is presented. Direct field andreverberant field are described, which are two basic concepts of the FE-SEA hybridmethod. The dynamic equations of the deterministic subsystem and the power balanceequation of the random subsystem are summed up for the FE-SEA hybrid method. Theloss factor of the stiffened panel is tested based on steady energy flow methods. And thetest program is described in details. The FEM model, the SEA model and the FE-SEAhybrid model of the stiffened panel specimens are constructed. The model simulationresults and experimental results are compared, during which the measured loss factor isutilized as the loss factor in the simulation model. Finally, the SEA method and FE-SEAhybrid method are used to construct the part model and the overall model of a launchvehicle payload based on the modeling study of the stiffened panel specimens. Sensitivityanalysis is developed when loss factor is in the range of engineering analysis. Thedynamic response of the payload is indicated using the SEA model and the FE-SEAhybrid model. The influence of the structural response is analyzed when the tank is filledor under other different load. It shows that it will only affect the surrounding sub-system of the tank when it is filled with fluid, while there is almost no effect on othersubsystems.
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