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Load-bearing structural member damage identification method and system based on strain mode

A strain mode and damage identification technology, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve problems such as poor application effect, damage to the degree of freedom of displacement mode shape and angle, and inconsistency of stiffness matrix, etc., to achieve anti-corrosion Strong interference ability, high sensitivity and wide detection range

Pending Publication Date: 2022-02-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the traditional element modal strain energy, using the displacement mode and non-destructive stiffness matrix, there are degrees of freedom in the rotation angle of the displacement mode and the inconsistency of the stiffness matrix before and after damage, resulting in poor practical application effect

Method used

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  • Load-bearing structural member damage identification method and system based on strain mode
  • Load-bearing structural member damage identification method and system based on strain mode
  • Load-bearing structural member damage identification method and system based on strain mode

Examples

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Embodiment 1

[0038] This embodiment provides a damage identification method for load-bearing structural parts based on strain modes;

[0039] Such as figure 1 As shown, the damage identification method of load-bearing structural parts based on strain mode includes:

[0040] S101: Construct a finite element model before damage and a finite element model after damage of the load-bearing structural member to be analyzed;

[0041] S102: Perform multiple modal tests on the load-bearing structure to be analyzed to obtain the post-damage strain mode;

[0042] S103: Perform modal analysis on the finite element model before damage to obtain the overall stiffness matrix before damage, the overall mass matrix, strain modes and natural frequencies before damage; solve the finite element model after damage to obtain the overall stiffness matrix after damage; Among them, the overall mass matrix remains unchanged before and after damage;

[0043] S104: Obtain the modal strain energy before damage base...

Embodiment 2

[0128] This embodiment provides a damage identification system for load-bearing structural parts based on strain modes;

[0129] Damage identification system for load-bearing structural parts based on strain mode, including:

[0130] A model building module configured to: build a finite element model before damage and a finite element model after damage of the load-bearing structural member to be analyzed;

[0131] The modal test module is configured to: perform multiple modal tests on the load-bearing structure to be analyzed to obtain the post-damage strain mode;

[0132] The solution module is configured to: perform modal analysis on the finite element model before damage, and obtain the overall stiffness matrix, overall mass matrix, strain mode and natural frequency before damage; solve the finite element model after damage, and obtain The overall stiffness matrix after damage, where the overall mass matrix remains unchanged before and after damage;

[0133] The modal st...

Embodiment 3

[0140] This embodiment also provides an electronic device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are programmed Stored in the memory, when the electronic device is running, the processor executes one or more computer programs stored in the memory, so that the electronic device executes the method described in Embodiment 1 above.

[0141] It should be understood that in this embodiment, the processor can be a central processing unit CPU, and the processor can also be other general-purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate array FPGA or other programmable logic devices , discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, o...

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Abstract

The invention discloses a load-bearing structural member damage identification method and system based on a strain mode. The method comprises the following steps: constructing a finite element model before and after damage of a to-be-analyzed load-bearing structural member; carrying out multiple modal tests on the to-be-analyzed bearing structural member to obtain a strain modal after damage; performing modal analysis solution on the pre-damage finite element model to obtain a pre-damage overall stiffness matrix, an overall mass matrix, a pre-damage strain modal and an inherent frequency; solving the damaged finite element model to obtain a damaged overall stiffness matrix; obtaining modal strain energy before damage based on the integral stiffness matrix and the strain modal before damage; based on the post-damage overall stiffness matrix and the post-damage strain mode, obtaining post-damage modal strain energy; based on the inherent frequency, the overall mass matrix, the modal strain energy before and after damage and the element stiffness reduction coefficient, obtaining damage identification of the modal strain energy sensitivity; and solving the modal strain energy sensitivity structure damage equation based on the strain modal to obtain an identification result.

Description

technical field [0001] The invention relates to the technical field of damage identification of load-bearing structural parts, in particular to a damage identification method and system for load-bearing structural parts based on strain modes. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] The monitoring technologies for key load-bearing structural parts such as ships, bridges, and high-speed trains mainly include ultrasound, optical fiber, and acoustic emission. According to different structures and materials, one or more monitoring technologies are used to monitor structural parts for damage. There are model-based methods and response signal-based methods for structure damage identification. Model-based methods use sensor technology to obtain structural vibration signals to determine the unknown dynamic parameters of the physical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23G06F2119/14Y02T90/00
Inventor 张雷程洋洋姜明顺张法业隋青美贾磊
Owner SHANDONG UNIV
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