Acquisition method of spacecraft mechanical environment under combined stochastic excitation

Abstract

The method for obtaining the mechanical environment of a spacecraft under the action of combined random excitation, the steps are: (1) dividing the spacecraft subsystem according to the modal density; (2) solving the dynamic response of the random subsystem; (3) loading processing of the combined random excitation; (4) Dynamic response solution of deterministic subsystem. The method of the invention fully utilizes the advantages of the finite element-statistical energy hybrid analysis method for modeling, overcomes the shortcomings of the traditional finite element method and the traditional statistical energy analysis method in dealing with broadband dynamic problems, and realizes the external acoustic load of the spacecraft and the random The reasonable loading of the basic excitation load has established a set of engineering and practical means of predicting the mechanical environment of the spacecraft under the combined random excitation.

Description

Technical field [0001] The invention relates to a method for obtaining structural dynamics characteristics of a large spacecraft structure under various complex random excitations. Background technique [0002] The random excitation of the spacecraft structure during the launch section includes not only the random basic excitation from the rocket, but also the acoustic load of aerodynamic pressure and engine jet noise transmitted to the surface of the satellite through the fairing. The real random mechanical environment of the spacecraft is induced by these two kinds of loads. Therefore, the random foundation excitation and the acoustic load are both indispensable to the spacecraft structure. Especially in the transonic phase, both loads will have a maximum value, which may have the same magnitude impact on the spacecraft structure response. At present, in engineering, spacecraft-level products often choose one of random basic vibration tests and noise tests to carry out ground ...

AI Technical Summary

Problems solved by technology

However, traditional analysis methods only use the same analysis method for all structural systems, and cannot treat different substructures differently

Therefore, for the response of complex structures under broadband loads, neither the finite element method nor the statistical energy analysis method can be well analyzed

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