Numerical method for obtaining coupling loss factor

Abstract

The invention puts forward a numerical method for obtaining a coupling loss factor. The method comprises the following steps that: (1) dividing a system into continuous coupling subsystems; (2) calculating the modals of the subsystems; (3) calculating a coupling parameter between the modals in an adjacent subsystem; (4) on the basis of a modal energy method, calculating the distribution of modal upper load input power and modal vibration energy in a frequency domain; (5) calculating and analyzing the total input power of the upper load of the subsystem in a frequency band and the total vibration energy of the subsystem; and (6) on the basis of a power input method, calculating a coupling loss factor. The numerical method for obtaining the coupling loss factor is a numerical method for obtaining the coupling loss factor on the basis of the modal energy method and the power input method. By use of the method, the modal energy method is combined with the power input method, the influence of power transmission among resonant modals can be considered, and the coupling loss factor among subsystems of a statistical energy method can be accurately calculated.

Description

technical field [0001] The invention relates to the technical field of high-frequency dynamic response prediction based on a statistical energy method, in particular to a numerical method for obtaining coupling loss factors. Background technique [0002] During the mission cycle, the spacecraft faces severe high-intensity, broadband noise and other environments, which may cause structural failure or failure of precision instruments and instruments. Therefore, in the design process of the spacecraft, the influence of high-intensity, broadband noise needs to be considered. Experimental methods, theoretical methods and numerical methods can be used to predict the dynamic response of the system under high-frequency noise excitation. Among them, the test method can obtain reliable results, but the cost of carrying out test analysis is high and the design cycle is long; the theoretical method is only suitable for simple systems, and it is difficult to solve the problem of dynamic...

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Problems solved by technology

Among them, the test method can obtain reliable results, but the cost of carrying out test analysis is high and the design cycle is long; the theoretical method is only suitable for simple systems, and it is difficult to solve the problem of dynamic response prediction of complex systems; numerical methods are well applicable to complex systems It is an effective auxiliary means for experimental analysis

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