Finite element model correction method of composite material structure based on clustering analysis

Abstract

The invention provides a finite element model correction method of a composite material structure based on clustering analysis. An initial finite element analysis model is established, an experiment modal frequency and a modal oscillation shape of the structure are measured, a relative sensitivity matrix of parameters to be corrected is calculated, a layering clustering algorithm is utilized to conduct parameter grouping on the parameters to be corrected, relative sensitivity analysis is further conducted on clustering parameters, the clustering parameter with the largest relative sensitivity average value in all the parameters is selected to be corrected, a modal frequency of an analysis model and a residual vector of an actually measured modal frequency are constructed, a target function needed for analysis model correction is established, and an optimizing inverse problem of the target function is constructed to correct the finite element model of the composite material structure. Through the combination of numerical simulation, texts and an optimizing technology, a relative sensitivity matrix of the parameters is adopted to conduct the clustering analysis, the quantity of the parameters to be corrected is reduced, the correction program stability is improved, an accurate and equivalent finite element model parameter correction method of a composite material based on the combination of the numerical simulation, the experiments and optimization is provided for engineering application.

Description

technical field [0001] The invention relates to a composite material structure, in particular to a correction method for a finite element model of a composite material structure. Background technique [0002] Composite material structures have excellent properties such as high specific strength, high specific stiffness, and fatigue resistance, and are widely used in aerospace, automobile, and shipbuilding industries. But at the same time, due to its various material components and complex manufacturing process, the mesoscopic material parameters of the composite material structure are different. In the process of structural analysis and design, if the mesoscopic analysis model of the composite material structure is used, the difficulty of modeling and the time cost of the product design stage will be greatly increased. Therefore, it is of great significance to establish the finite element analysis model of composite material structure and modify it to improve the accuracy o...

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Problems solved by technology

[0003] The finite element model of composite material structure usually adopts orthotropic materials. For the multilayer composite material structure, the number of parameters to be corrected will be far more than the experimental data, resulting in ill-conditioned problems in the correction process

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