Composite material structure bending rigidity and load collaborative identification method

CN120257572APending Publication Date: 2025-07-04DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202510197167.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

The prior art is difficult to efficiently identify bending stiffness and distributed loads in composite material structures at the same time. Especially in the environment of coupling complex machinery and thermal loads, the damage recognition accuracy is insufficient and the parameter coupling problems are prominent, making it difficult to meet the real-time monitoring needs.

Method used

By measuring the surface strain of the composite material structure in real time, converting it into vibration displacement using the inverse finite element method, combining the dynamic equilibrium relationship of the composite material structure microelements, a linear system of equations is constructed to identify bending stiffness and load.

Benefits of technology

It realizes the accurate identification of bending stiffness and dynamic load of composite material structures, simplifies the operation process, is convenient for on-site application, and is suitable for status monitoring and damage identification in aerospace, vehicles, navigation, transportation, petrochemical and other fields.

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Abstract

The invention discloses a composite material structure bending rigidity and load collaborative identification method, which comprises the following steps: selecting a proper inverse shell element discrete structure according to the geometric form and stress characteristics of a composite material structure, and calculating the theoretical strain of the inverse shell element discrete structure; selecting appropriate strain measurement points on the upper and lower surfaces of the inverse shell unit discrete structure, arranging strain sensors at corresponding positions, and calculating the actually measured strain of the inverse shell unit discrete structure; constructing a solution equation of an inverse finite element based on theoretical strain and actually measured strain data, and solving a vibration displacement field of the structure; based on the dynamic balance relationship of the structural infinitesimal elements, constructing a linear equation set containing composite material bending stiffness parameters, and constructing a quantitative mapping relationship between the vibration displacement of the structure and the external load; and substituting the vibration displacement data obtained by reconstruction into the equation set to obtain the bending rigidity of the composite material structure and the distribution and amplitude of the reconstruction dynamic load on the composite material structure.
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Citation Information

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