Software Realization And Experimental Verification Of Structural Impact Response Based On Statistical Energy Analysis

The study of spacecraft environmental conditions is a problem that must be faced in the design stage of spacecraft,including impact,mechanical vibration,acoustic-vibration coupling,acceleration and microgravity.The predicted mechanical environment of spacecraft directly reflects the overall design level of spacecraft.With the rapid development of China’s space industry,the standard of spacecraft design is becoming higher and higher.The impact problem,especially the transient high frequency impact,has been restricting the development of spacecraft technology in China.At present,the prediction methods of spacecraft mechanical environment mainly include finite element method,boundary element method,power flow method,modal analysis method and statistical energy method,among which statistical energy method is suitable for solving high frequency problems but is based on steady state.For transient impact problems,the statistical energy analysis method should be extended with signal processing method to solve the transient problem.First,this paper studies the development and current situation of statistical energy method and shock response problem,and analyses some existing problems.Next,the theory of shock response prediction is introduced,and the relevant knowledge of statistical energy method is sorted out.Then,for plate structure systems,the prediction method of impact response is deduced based on statistical energy method and signal processing related methods;the prediction method is realized by using the programming language of Matlab,and an interface solution software is formed,which can be used for human-computer interaction;and the solution process and results of the software are introduced with two-plate system and five-plate system as examples.Finally,a coupling loss factor measurement experiment and an impact test of two-honeycomb-plate system are designed and completed.The coupling loss factor of the real structure can be obtained by processing the test results through the traditional method of measuring the coupling loss factor.Structural impact test is used to simulate explosive impact of initiating explosive.The structural response is measured by light-gas gun impact method,and the shock response spectrum is obtained.The accuracy of the algorithm is verified by comparing the results with those of the shock response prediction method based on statistical energy method.