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Integral and local information fusing method of structure health diagnosis

A technology of local information and fusion methods, applied in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2011-04-27
李惠 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Environmental factors such as temperature, humidity, freeze-thaw, environmental noise and other factors will cover up the changes in structural model parameters caused by damage, resulting in greater uncertainty in the damage diagnosis results

Method used

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  • Integral and local information fusing method of structure health diagnosis
  • Integral and local information fusing method of structure health diagnosis
  • Integral and local information fusing method of structure health diagnosis

Examples

Experimental program
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Effect test

Embodiment 1

[0078] Example 1: Combining figure 1 , figure 2 , a method for fusion of structural health diagnosis information of the present invention, the steps are as follows:

[0079] Step 1: Arrange acceleration and strain sensors on the target structure and conduct vibration tests to obtain acceleration and strain time-history responses, identify the modal parameters of the structure, including frequency, mode shape, and strain mode, and the modal data obtained from the nth test use express,

[0080] γ ^ n = [ ω ^ 1 n , . . . , ω ^ N m , n ...

Embodiment 2

[0127] Example 2: Combining Figure 1-21 The specific embodiment of the present invention is illustrated through the experiment of a 20-span truss model. The model is a 20-span simply supported and rigidly connected truss structure, imitating the form of a railway bridge. The total length of the truss is 8m, the length of each truss is 0.4m, and the total height is 0.8m. The structure has a total of 312 members, and 108 bolted ball nodes connect each member. The rods and nodes of the entire truss are made of steel, and the elastic modulus and density are 2.06×10 5 MPa and 7,800Kg / m 3 .

[0128] The acceleration sensor is arranged at the node of the lower chord, and the position of the measuring point is as follows: figure 1 As shown, due to the limitation of the number of acceleration sensors, the mid-span node is taken as the reference point, and each working condition is divided into left and right half-spans for testing respectively. The fiber grating sensor and the re...

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Abstract

The invention provides an integral and local information fusing method of structure health diagnosis based on monitoring information of integral acceleration and local stress sensors, which comprises the steps of: arranging acceleration and stress sensors on a target structure and carrying out vibration test to obtain acceleration and stress stroke response, and recognizing modal parameters of the structure; establishing a finite element model of the structure; and preliminarily determining the damage range by adopting the modal stress energy indexes through an actually measured modal vibration shape. The invention integrates information of the integral acceleration sensor and the local stress sensor for structural health diagnosis, fully utilizes multi-sensor information in the structural health monitoring, a Bayesian probability theory is adopted, considers the uncertainty of actually measured information, and accords with the engineering actual characteristic. The invention can obtain accurate, reliable and stable damage diagnosis results and has stronger noise immunity and robustness.

Description

(1) Technical field [0001] The invention relates to a civil engineering structure monitoring technology, in particular to an overall and local information fusion method for structural health diagnosis. (2) Background technology [0002] The service life of major engineering structures is as long as decades or even hundreds of years. Under the joint action of environmental erosion, material aging, long-term effect of load, fatigue effect and other disaster factors, it will inevitably lead to damage accumulation and resistance attenuation of the structural system. , in extreme cases may lead to catastrophic accidents. With the increasing attention to the safety, durability and normal use of engineering structures, people hope to fully understand the health of the structure even after some catastrophic accidents such as earthquakes, typhoons, and explosions occur during the service period of the structure. condition to determine if, and when, repairs and maintenance to the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 孙晓丹鲍跃全李惠欧进萍
Owner 李惠
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