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Method for automatically detecting free vibration response of high-speed railway bridge to recognize mode

A high-speed railway, automatic detection technology, applied in vibration measurement, vibration testing, vibration measurement in solids, etc., can solve the problem of requiring human participation in identification accuracy, unsatisfactory and other problems, and achieve low computational burden and high-precision modal parameter identification , to achieve the effect of automatic detection

Active Publication Date: 2019-04-26
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for automatically detecting the free vibration response data segment of a structure, so as to solve the problems that human participation is required for modal parameter identification using the free vibration response of a high-speed railway bridge after a train passes by and the identification accuracy is not ideal

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  • Method for automatically detecting free vibration response of high-speed railway bridge to recognize mode
  • Method for automatically detecting free vibration response of high-speed railway bridge to recognize mode
  • Method for automatically detecting free vibration response of high-speed railway bridge to recognize mode

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Embodiment Construction

[0028] The embodiments of the present invention are further explained below in conjunction with the technical solutions.

[0029] Using simply supported beam models, such as figure 1 shown. The length of each unit is 10m; based on the idea of ​​static cohesion, only the vertical displacement of the structure is considered and the torsional displacement is ignored, and each stiffness after static cohesion is k 1 =k 2 =k 3 =k 4 =k 5 =k 6 =100N / m; the mass of each unit in the lumped mass matrix is ​​m 1 = m 2 = m 3 = m 4 = m 5 =1.5kg; using Rayleigh damping, where the mass matrix coefficient α=0.0446, the stiffness matrix coefficient β=0.0013; the constant load F with an interval of 0.05m 1 (t)=F 2 (t)=2×10 3 N moves from left to right at a speed of 1m / s. The acceleration response of each node position is collected at a sampling frequency of 20 Hz for 175 s.

[0030] The specific implementation is as follows:

[0031] Collect the acceleration y(t) at each measuring ...

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Abstract

The invention belongs to the technical field of structure health monitoring and provides a method for automatically testing the free vibration response data segment after a train passes a high-speed railway bridge. Firstly, to-be-analyzed test response is determined according to the maximum value of the time point where the absolute maximum value of each test point vibration response vector is located; then single frequency modal response is extracted from the test response by using iterative variation mode analysis, the envelope amplitude of the modal response is fit by using the Hilbert transform; finally, the vibration characteristic at each time point is marked as attenuation vibration or non-attenuation vibration according to the single frequency free vibration amplitude attenuation characteristic, and a longest structural response data segment meeting the attenuation vibration requirement is taken as detection free vibration response to be applied to mode recognition. According to the method for automatically detecting the free vibration response of the high-speed railway bridge to recognize the mode, effective detection of the free vibration data segment without human participation can be realized, and the method has important signification to real-time accurate mode analysis of the high-speed railway bridge.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and relates to a method for automatically detecting the free vibration response of a high-speed railway bridge after a train passes in mode recognition of an engineering structure. Background technique [0002] In bridge structural health monitoring, it is a feasible idea to evaluate the overall state of the structure based on the real-time changes of modal parameters. However, the loads suffered by the actual bridge structure are complex and changeable, and it is very difficult to accurately extract the modal parameters of the structure. Commonly used modal parameter identification methods, such as random subspace method, natural excitation technology combined with characteristic system implementation algorithm, etc., although the algorithm is stable and reliable, require the excitation to obey the characteristics of Gaussian stationary white noise. Although some novel time...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M7/02G01M7/025G01H1/06G01H17/00
Inventor 伊廷华杨小梅曲春绪李宏男
Owner DALIAN UNIV OF TECH
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