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Pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis

A technology of wavelet packet analysis and structural state, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of insufficient precision and low recognition accuracy

Active Publication Date: 2019-12-03
HARBIN INST OF TECH
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Problems solved by technology

However, due to the lack of accuracy when using Fourier transform to analyze the high-frequency mode of the signal, and the external interference such as noise has been received when the signal is actually measured, the accuracy of damage identification is low

Method used

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  • Pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis
  • Pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis
  • Pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis

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Embodiment Construction

[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0080] Combined with the manual Figure 1 to Figure 11 Illustrate the specific embodiment of the present invention, specifically as follows:

[0081] A bridge pier structure state assessment method based on variable speed vehicle excitation and wavelet packet analysis, such as figure 1 As shown, the method includes the following steps:

[0082] Step 1, formulate the vehicle speed change excitation test plan: according to the inherent parameters of the bridge, esta...

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Abstract

The invention discloses a pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis, and belongs to the technical field of bridge working state detection and evaluation. The invention provides a pier structure state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis in order to improve the accuracy of pier structure detection and identification. According to the invention, the accurate bridge finite element model is established by using a model correction method, and a vehicle brake numerical simulation method is provided, so that a brake test scheme suitable for the bridge to be detected can be formulated more accurately. A proper wavelet basis function decomposition level is selected by using a costfunction, a pier top free attenuation section signal is used as a research object, and feature information with high sensitivity to damage is acquired through a wavelet packet decomposition signal processing mode. Indexes with high damage sensitivity and robustness are constructed, then the damage position and degree of the pier are recognized, and the performance state of the pier structure is evaluated.

Description

technical field [0001] The invention relates to a bridge pier structural state evaluation method based on variable-speed vehicle excitation and wavelet packet analysis, and belongs to the technical field of bridge working state detection and evaluation. Background technique [0002] As the main component of the lower structure of the bridge, the pier is used to transfer the load from the upper structure to the foundation reliably and effectively. During the service period, the bridge piers not only bear the load of vehicles and people, but also may be affected by water erosion, environmental erosion, and the impact of vehicles, ships and drift ice, so they are prone to damage during operation. Once the bridge piers are damaged, the bearing capacity of the bridge structure will be greatly weakened. In severe cases, the bridge may even collapse as a whole, which not only seriously affects the normal operation of the traffic system, but also directly threatens the personal safe...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 李岩杨婷婷高庆飞刘立鹏林雪琦
Owner HARBIN INST OF TECH
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