Numerical method for obtaining coupling loss factor

A technology of coupling loss and numerical method, which is applied in the field of high-frequency dynamic response prediction, can solve problems such as high cost, only applicable theoretical methods, long design cycle, etc., and achieve the effect of accurate calculation

Active Publication Date: 2017-11-21
SOUTHEAST UNIV
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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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  • Numerical method for obtaining coupling loss factor
  • Numerical method for obtaining coupling loss factor
  • Numerical method for obtaining coupling loss factor

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Such as figure 1 Shown is the principle flow chart of the present invention, mainly comprises the following steps:

[0047] Step (1) divides the system into continuously coupled subsystems:

[0048] Divide the system into continuous coupling subsystems with imaginary interfaces, and approximate the boundary conditions of the subsystems on the coupling interface, assuming that the more "rigid" subsystem is a free boundary on the coupling interface, and assuming the "softer" subsystem Fixed support on the coupling interface. The vibration of adjacent subsystems is described by displacement mode and stress / acoustic pressure mode, respectively.

[0049] Step (2) Calculate the mode of the subsystem:

[0050] The modal parameters of the subsystems are calculated based on the finite element method.

[0051] Step (3) Calculate the coupling parameters between modes ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 李彦斌张鹏费庆国吴邵庆杨轩姜东
Owner SOUTHEAST UNIV
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