A complex variable differential sensitivity-based nonlinear structure finite element model correction method

A nonlinear model and model correction technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of increasing analysis time and the theory of nonlinear structure finite element model correction methods is still in the middle of further development , to achieve the effect of improving the modeling accuracy

Active Publication Date: 2019-06-14
SOUTHEAST UNIV
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Problems solved by technology

[0003] The application of existing model correction technology in linear structures has been relatively mature, but the theory of nonlinear structural finite element model correction methods is still under development when considering the nonlinear characteristics of structures
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  • A complex variable differential sensitivity-based nonlinear structure finite element model correction method
  • A complex variable differential sensitivity-based nonlinear structure finite element model correction method
  • A complex variable differential sensitivity-based nonlinear structure finite element model correction method

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[0039] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Such as figure 1 As shown, a nonlinear structural finite element model correction method based on complex variable differential sensitivity includes the following steps:

[0041] (1) Establish a nonlinear finite element initial analysis model of a structure with nonlinear characteristics, and calculate the initial analysis dynamic response of the structure;

[0042] (2) Perform compound step length perturbation on the parameters to be corrected in the structure, and calculate the nonlinear dynamic response sensitivity;

[0043] (3) Measure the response data of the structure, and establish the objective function of nonlinear model correction;

[0044] (4) The measured dynamic response and the analyzed dynamic response are optimized by least squares, so as to realize the correction of the nonlinear finite element model...

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Abstract

The invention discloses a complex variable differential sensitivity-based nonlinear structure finite element model correction method, which comprises the following steps of firstly, establishing a nonlinear finite element initial analysis model of a structure; secondly, performing complex step perturbation on a to-be-corrected parameter in the structure, and calculating nonlinear dynamic responsesensitivity; thirdly, measuring response data of the structure, and establishing an objective function of nonlinear model correction; and finally, performing least square optimization on the measureddynamic response and the analyzed dynamic response so as to realize nonlinear finite element model correction, so that the structural parameters of the nonlinear finite element analysis model can be corrected, and the calculation precision of the analysis model is improved.

Description

technical field [0001] The invention belongs to the field of nonlinear structure finite element model correction, in particular to a nonlinear structure finite element model correction method based on complex variable differential sensitivity. Background technique [0002] The maturity of the finite element analysis method provides a fast and effective numerical solution for the analysis of engineering structures. However, the errors in the finite element modeling process often lead to the inability of the initial finite element model to accurately represent the mechanical characteristics of the structure. As a method to provide an accurate engineering structure analysis model, finite element model correction uses the measurement data of the analysis structure to modify the modeling parameters of the finite element analysis model, so that the residual error between the analysis response and the measurement dynamic response is minimized, thereby obtaining an accurate analysis...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 费庆国曹芝腑姜东田宇朱锐
Owner SOUTHEAST UNIV
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