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Statistical energy analysis subsystem identification method based on reduced-order modal energy clustering analysis

A technology of statistical energy analysis and modal energy, which is applied in character and pattern recognition, computing, computer parts, etc., can solve problems such as poor calculation stability and low recognition accuracy, achieve small calculation, fast and accurate recognition, and improve accuracy and stability effects

Pending Publication Date: 2022-01-28
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to address the deficiencies of the prior art, to provide a statistical energy analysis subsystem identification method based on reduced-order modal energy cluster analysis, and to solve the low recognition accuracy existing in the current statistical energy analysis subsystem identification method , the problem of poor calculation stability

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  • Statistical energy analysis subsystem identification method based on reduced-order modal energy clustering analysis
  • Statistical energy analysis subsystem identification method based on reduced-order modal energy clustering analysis
  • Statistical energy analysis subsystem identification method based on reduced-order modal energy clustering analysis

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0036] select as figure 1 The I-shaped plate structure is shown as an example. The thickness of each plate is set to 0.05m, other geometric dimensions such as figure 1 indicated in the mark. The material parameters of the structure are: modulus of elasticity 30Gpa, density 2400kg / m 3 , Poisson's ratio is 0.2.

[0037] The specific operation is as follows:

[0038] (1) Set the analysis frequency to [900, 1200] Hz. The propagation speed of wave in metal is about 3000m / s, and the maximum element size calculated from this is 416mm. The finite element analysis model of the I-shaped plate structure is established, with a total of 280 elements. The maximum element size of the finite element model is 267mm, which meets the requirements of calculation and analysis. In order to facilitate the subsequent ...

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Abstract

The invention provides a statistical energy analysis subsystem identification method based on reduced-order modal energy clustering analysis, and the method comprises the steps: carrying out modal analysis of a structural discretization finite element model, and obtaining the modal frequency and modal energy of a structure in an analysis frequency band; performing order reduction on the modal energy matrix by adopting principal component analysis, and extracting main features in modal information; and the statistical energy analysis subsystem is used for carrying out clustering analysis on the reduced-order modal energy matrix and identifying the structure. A traditional statistical energy analysis subsystem identification method needs to calculate a plurality of load working conditions, the calculation amount is large, the identification precision is low, and the calculation stability is poor, and the method provided by the invention only needs to carry out one-time finite element modal analysis on a structure, and main modal energy information is extracted through principal component analysis; and the recognition precision of the statistical energy analysis subsystem is greatly improved.

Description

technical field [0001] The invention relates to a statistical energy analysis subsystem identification method, in particular to a statistical energy analysis subsystem identification method based on reduced-order modal energy cluster analysis. Background technique [0002] Engineering structures such as high-speed trains and launch vehicles will face high-frequency vibration loads such as aerodynamic noise and pyrotechnic shock during their service. Statistical energy analysis theory is a common method to predict the dynamic response of structures under high-frequency loads. Based on the principles of statistical physics, the method divides the structure into several subsystems, and uses vibration energy to analyze the high-frequency dynamic response and vibration load of the structure. Characterization, the high-frequency dynamic response of the structure is obtained by solving the energy balance equations among the subsystems. Therefore, the rational division of the stati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/27G06F17/16G06K9/62
CPCG06F30/23G06F30/27G06F17/16G06F18/2135G06F18/23213
Inventor 陈强费庆国李彦斌吴邵庆张宇鹏吴东涛
Owner SOUTHEAST UNIV
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