Structural damage identification method based on variable-scale symbolization time series analysis

A technology of time series analysis and structural damage, which is applied in the fields of instrumentation, computing, and electrical digital data processing, etc., can solve problems such as unsatisfactory recognition results and inability to effectively identify structural damage, and achieve early damage sensitivity and robustness. sticky effect

Pending Publication Date: 2019-06-11
SHANTOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The identification results of the symbolic time series analysis method have strong randomness and cannot effectively identify the damage of the structure
[0007] (2) The method of combining the virtual impulse response function and wavelet transform can identify the damage of the structure well, but the early damage identification results for the structure are not very ideal

Method used

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  • Structural damage identification method based on variable-scale symbolization time series analysis
  • Structural damage identification method based on variable-scale symbolization time series analysis
  • Structural damage identification method based on variable-scale symbolization time series analysis

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Experimental program
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Embodiment

[0035] by figure 1 The shown 3-DOF chain structure verifies the effectiveness of the method. The basic properties of the structure are as follows: the mass M 1 = 1; M 2 = 1.5; M 3 = 2; stiffness K 1 =600;K 2 =1200;K 3 =1800; the natural frequency w of the structure 1 =14.52;w 2 = 31.05; w 3 =46.50; the damping ratio corresponding to each mode of the structure is 0.05, and the smooth Gaussian white noise acts on the bottom of the structure as the seismic excitation. Wherein the direction vector is E=[111] T , the initial velocity and displacement of the structure are both zero. Extract 50 seconds of response data at each concentrated mass, where the sampling frequency is 100 Hz. Staged stiffness reductions at specific locations are used to simulate damage, as shown in Table 1, and there are seven damage cases in total.

[0036] Table 1 Structural damage conditions

[0037]

[0038] In order to avoid the randomness of the identification results and ensure the val...

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Abstract

The embodiment of the invention discloses a structure damage identification method based on variable-scale symbolization time sequence analysis, which is used for judging the structure damage condition by combining a virtual pulse response function and utilizing the principle of rich information of an intrinsic structure frequency change rate in a coding subsequence obtained by a variable-scale symbolization time sequence analysis method. The method comprises the following steps: firstly, calculating a virtual pulse response function of a structure, then calculating the frequency of each subsequence by utilizing a proposed variable-scale symbolization method, calculating a damage index ESAM by taking the frequency as a probability feature vector, and judging whether the structure is damaged or not according to the change of the ESAM under different working conditions. According to the method, the damage state of the structure can be effectively judged, the method is more sensitive to the damage of the structure, and the method has higher environmental excitation robustness.

Description

technical field [0001] The invention relates to the technical field of structural health monitoring, in particular to a structural damage identification method based on variable-scale symbolic time series analysis under environmental excitation. Background technique [0002] The safety of civil engineering structures during construction and service is closely related to the protection of people's lives and property. High-rise residences, gymnasiums, long-span bridges and other structures will cause unimaginable consequences if serious damage occurs. Therefore, it is of great significance to ensure the safety of civil structures during construction and use. Due to the aging of materials, initial design defects, improper construction operations, untimely maintenance and other human factors, as well as the influence of environmental factors such as earthquakes, wind loads, traffic, temperature, corrosion, etc., structures are prone to various damages during construction and no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李东升王传林
Owner SHANTOU UNIV
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