Model updating method based on strain modal shape correlation

Abstract

The invention discloses a model updating method based on strain modal shape correlation. The specific steps are as follows: step 1), establishing a finite element model of a structure and analyzing the finite element model; step 2), performing experimental design and analysis; step 3), extracting a finite element simulation strain mode; step 4), performing correlation analysis: adopting a model confidence factor, and analyzing the correlation between the finite element model and the strain modal shape of an experimental test; step 5), selecting a mode to be modified; step 6), selecting a parameter to be identified; step 7), constructing a modification target; and step 8), performing modified iteration. According to the model updating method based on the strain modal shape correlation provided by the invention, by selecting an appropriate unit type, the obtained finite element model of the structure provides a reference model for strain response calculation; by selecting an appropriate strain mode to be modified, parameters to be modified and an optimum design method, the modified finite element model can better reflect the strain response of the structure; and the accurate finite element model is beneficial to the subsequent structural dynamic optimization design based on the finite element model, and the development of structural health monitoring and structural response prediction and so on.

Description

technical field [0001] The invention belongs to the field of system parameter identification, in particular to a model correction method based on the correlation of strain mode vibration shapes. Background technique [0002] With the development of finite element theory and the improvement of computer application level, modeling and simulation analysis methods have been widely used in structural dynamics optimization design, structural health monitoring and other fields. Model-based structural optimization or health monitoring requires an accurate finite element model, so it is necessary to calibrate the finite element model before using it for response calculations. The finite element model correction takes the response of the experimental test as the target, adjusts the parameters in the finite element model, and makes the response of the finite element calculation close to the experimental test, so as to narrow the gap between the simulation analysis and the experimental ...

AI Technical Summary

Problems solved by technology

Most of these responses are the global characteristic quantities of the structural response. The model corrected based on these responses has the ability to reflect the global vibration characteristics of the structure, but the description of the local characteristics of the structure is not comprehensive and accurate.

Images