Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Operation bridge vibration and health state abnormity early warning method based on three-dimensional diagram

A state-of-health, three-dimensional map technology, applied to vibration measurement in solids, vibration measurement, testing of mechanical components, etc. High energy, sensitive to damage, robust to noise

Active Publication Date: 2021-05-25
JINAN UNIVERSITY
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the following problems, the application of these methods in actual engineering structures is hindered. First, when performing modal recognition, problems such as subjective errors, power spectrum leakage, dense mode loss, and truncation errors will inevitably occur; second. , in the time-domain health monitoring method based on vibration parameters, there are problems of system order determination and modal loss; third, it cannot contain as many modal information as possible, and the response signal related to damage is lost The high-order mode makes the extracted indicators not sensitive enough to structural state changes; fourth, some methods require manual participation in the calculation, resulting in the randomness of manual intervention, and are not suitable for automatic online analysis and health monitoring of massive continuous monitoring data; fifth, Due to too many uncertain factors in the actual bridge structure, it is difficult to establish an accurate matching structural analysis model, which makes it difficult to apply the health monitoring method relying on the structural analysis model to the actual bridge structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Operation bridge vibration and health state abnormity early warning method based on three-dimensional diagram
  • Operation bridge vibration and health state abnormity early warning method based on three-dimensional diagram
  • Operation bridge vibration and health state abnormity early warning method based on three-dimensional diagram

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The implementation process of the method for early warning of bridge structure vibration and abnormal health status in the present invention is as follows: figure 1 As shown, the specific steps of an operation bridge vibration and abnormal health state early warning method based on a three-dimensional graph of time, frequency and energy are as follows:

[0049] S1. Arranging one or more acceleration sensors on the bridge structure to test the acceleration response signal;

[0050] S2. Preprocessing the acceleration response signal obtained by the acceleration sensor test, such as removing data when the sensor is abnormal, and performing de-drifting and other processing;

[0051] S3, performing a windowing function on the acceleration response signal with a specified time length in advance;

[0052] S4. Perform power spectrum calculation and power spectrum average calculation on the acceleration response signal of the windowing function;

[0053] S5. Draw the power spe...

Embodiment 2

[0067] For example Figure 8 Numerical simulation research is carried out on the simply supported beam under the action of the moving load shown in order to further demonstrate the method for early warning of vibration and abnormal health status proposed by the present invention.

[0068] The simply supported beam with constant section is 60 meters long, the cross section is rectangular, the Young's modulus is 206GPa, and the linear density is 90000.6kg / m 2 , the two ends of the beam are simply supported, and the upper surface of the simply supported beam uses moving loads that move from the left to the right and from the right to the left at a constant speed to simulate the vehicle. The number, weight, and speed of the moving load are generated by random numbers to simulate According to the traffic flow of the actual bridge, a vertical acceleration sensor is installed on the simply supported beam at three-eighths away from the left end support.

[0069] The specific implemen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an operation bridge vibration and health state abnormity early warning method based on a three-dimensional diagram. The method comprises the steps of testing and collecting an operation bridge acceleration response signal; carrying out pre-processing such as drift removal on the acceleration response signal; performing windowing function on acceleration response signals within a preset time length, calculating a power spectrum, and removing interference of excitation frequency; collecting the acceleration response signal power spectrums of a plurality of time periods into a three-dimensional diagram, and converting the three-dimensional diagram into a color plane graph or a gray plane graph; and judging bridge vibration abnormity and health state abnormityaccording to the change trend of each order of frequency and color or gray level change in the three-dimensional diagramso as to realize bridge early warning. According to the method, the vibration abnormity and the health state abnormity of the bridge can be effectively judged, so that early warning is given out, a structural analysis model is not needed, calculation is simple and convenient, environmental factor robustness is good, and good engineering applicability is achieved.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, and relates to a structural vibration and state abnormal early warning technology, in particular to a method for early warning of vibration and abnormal health state of an operating bridge based on a time-frequency energy three-dimensional graph. Background technique [0002] There are more and more bridge structures in the world. Bridge structures are often large and complex. It will inevitably decline or even be damaged, and eventually lead to partial or even overall collapse of the structure. When an accident occurs, it will not only cause huge economic losses, but also endanger people's lives. Therefore, it is very important to monitor the vibration and condition of bridge structures. necessary. [0003] In recent decades, bridge structural health monitoring methods based on vibration parameters have also been proposed. Vibration parameters include frequency, mode shape, frequency...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01H1/00
CPCG01M13/00G01H1/00
Inventor 李雪艳王立新
Owner JINAN UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products