Real-time monitoring system and method for assessing damage of truss structure

A real-time monitoring system and truss structure technology, applied in the testing of machines/structural components, measuring devices, vibration testing, etc., can solve problems such as structural safety threats, low damage sensitivity, and failure to detect rods in time, and achieve Labor saving, high damage sensitivity, simple operation effect

Active Publication Date: 2016-06-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, damage detection based on vibration information in truss (grid) structures still faces challenges such as low damage s...

Method used

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  • Real-time monitoring system and method for assessing damage of truss structure
  • Real-time monitoring system and method for assessing damage of truss structure
  • Real-time monitoring system and method for assessing damage of truss structure

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Embodiment Construction

[0039] Taking the numerical model of a certain truss structure model as an example to carry out research on real-time damage monitoring, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings:

[0040] 1) Finite element model

[0041] The truss is composed of 312 rods, 108 hinge points and 624 bolt connections; the total length of the truss is 8m, the height is 0.9m, and the transverse width is 0.56m. The finite element model is established based on MATLAB, and the side view of the model is attached Figure 4 shown.

[0042] 2) Measuring point layout and acceleration response

[0043] Such as Figure 4 , select the substructure in the dotted frame of the truss structure as the research object, and there are 32 members in this part. Truss nodes 23-40 are used as measuring points. White noise with a frequency bandwidth of 0-150 Hz is applied to the No. 47 hinge point in the finite element model to simu...

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Abstract

The invention relates to a real-time monitoring system and method for assessing damage of a truss structure, and belongs to the technical field of structure health monitoring. The monitoring system is composed of bidirectional accelerometers, a data collection module, a calculation analysis module, a real-time damage location result display module and a decision module, wherein the data collection module collects and stores signals, sent by the bidirectional accelerometers, at each measuring point before damage and in the to-be-measured state of the truss structure; the calculation analysis module calls acceleration signals of all the measuring points before damage and in the present state of the structure, and implements calculation by using the real-time truss structure damage monitoring method; real-time damage location result display module provides a damage location result, namely whether there is a damaged rod in the structure, and displays the concrete position of the damaged rod; and the decision module analyze the result and decide whether to maintain or replace the rod. The monitoring system and method are suitable for damage location and safety assessment of truss rods in different types of truss structures, and also has the advantages of being suitable for environment excitation, high in damage sensitivity, convenient to operate and laborsaving.

Description

technical field [0001] The invention belongs to the technical field of vibration-based structural health monitoring, and relates to the real-time location of rod damage in a truss structure, in particular a system and method for real-time damage location of a truss structure are invented. Background technique [0002] Vibration-based structural damage monitoring technology detects, locates, and even quantifies damage by analyzing the vibration response signals measured by sensors installed on the structure with an algorithm, which has the advantages of real-time monitoring and manpower saving; it has received widespread attention and Much progress has been made. [0003] Truss (network truss) structures are widely used in long-span engineering structures and industrial structures such as bridges, gymnasiums, airports, stations, etc. Rod damage is a common damage form of truss (network truss) structures. How to diagnose the damage in time when the damage of the member is rel...

Claims

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Application Information

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IPC IPC(8): G01M7/02
CPCG01M7/025
Inventor 安永辉欧进萍
Owner DALIAN UNIV OF TECH
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