A method for automatic detection of free vibration response of high-speed railway bridges to identify modes
A high-speed railway, automatic detection technology, applied in the direction of vibration measurement, vibration test, vibration measurement in solids, etc., can solve problems such as unsatisfactory, human-involved identification accuracy, etc., to achieve high-precision modal parameter identification and low calculation burden , to achieve the effect of automatic detection
Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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[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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[0027] The embodiments of the present invention are further explained below in conjunction with the technical solutions.
[0028] 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.
[0029] The specific implementation is as follows:
[0030] Collect the acceleration under each measuring ...
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The invention belongs to the technical field of structural health monitoring, and provides a method for automatically detecting a free vibration response data section of a high-speed railway bridge after a train passes by. Firstly, the test response to be decomposed is determined according to the maximum value of the absolute maximum value of the vibration response vector at each measuring point; then, the single-frequency modal response is extracted from the test response by using iterative variational mode decomposition, and the Hill Burt transform to fit the envelope amplitude of the modal response; finally, according to the characteristics of single-frequency free vibration amplitude attenuation, the vibration characteristics at each time point are marked as attenuated vibration or non-attenuated vibration, and the The longest structural response data segment is used as the detected free vibration response for modal identification. The invention can realize effective detection of free vibration data segments without human participation, and has great significance for real-time and accurate mode analysis of high-speed railway bridges.
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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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