The Research Of Modeling Of Aircraft Structures By Statistical Energy Method And Acoustic Response Analysis

Be compared to general certainty method, such as finite element method, boundary element method and so on, statistical energy analysis method can solve the high frequency acoustic problem of complicated aircraft structure, which is currently one of the most effective methods of high frequency response analysis, and also got an extensive application at other realms such as ships, cars etc. But statistical energy analysis method is basic on some basic assumptions, so that there still is some limitation in application. Base on the simulation of a certain type rocket fairing acoustic test, contrapose to the typical structure form of aircraft structure, this article research the modeling methods of statistical energy analysis, and compare with the experiment to verify.Firstly ,this article introduces the development and application of statistical energy analysis method and FE-SEA Hybrid . On this basis, the article elaborates basic principle of statistical energy analysis methodand the method of determining statistical energy parameters, such as modal density, loss factor, input power and so on, and analysising the limitations in practical application.Afterwards, simulating the acoustic test of a certain type rocket fairing structure by statistical energy method. After briefly introducing the basic principle of acoustic expriment, introduce the modeling process of statistical energy of the rocket fairing in detail, including the analysis of energy flow pathways, equivalent treatment of special materials such as honeycomb structure, subsystem divide of special structure, and verify rationality, establish a reasonable statistical energy model.Then, analysis sensitivity of model within loss factor and sound absorption coefficient, find that the affect of dynamics response of the fairing is small in the range of general engineering experience value, and the sound pressure level of the fairing is little difference whatever there is a statellite,and the result of simulation is almost the same with that of the test on the total sound pressure level.Finally, contrapose to the stiffened skin commenly existing in the aircraft structure,designing the typical structure form ,and modeling the structure respectively by SEA and hybrid method, and summing up the effective methods by verified through experiments.