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Method for calculating guy cable vibrating base frequency

A calculation method and fundamental frequency technology, applied in the direction of tension measurement, etc., can solve the problems of low fundamental frequency recognition accuracy and weak robustness, so as to improve the fundamental frequency recognition accuracy, robustness and accuracy, and improve the automatic level Effect

Inactive Publication Date: 2009-11-25
GUIZHOU NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a robust calculation method for cable vibration fundamental frequency that can effectively improve the fundamental frequency recognition accuracy, thereby overcoming the problems of low fundamental frequency recognition accuracy and weak robustness in the prior art

Method used

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  • Method for calculating guy cable vibrating base frequency
  • Method for calculating guy cable vibrating base frequency
  • Method for calculating guy cable vibrating base frequency

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Experimental program
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Embodiment 1

[0014] Example 1. Such as figure 1 As shown, the vibration acceleration data of the collected cables are processed by zero-meaning and windowing respectively to calculate the power spectrum of the vibration acceleration; then based on the power spectrum of the vibration acceleration, the power of the vibration acceleration is extracted by autocorrelation calculation Approximate periodic peaks on the spectrum, and use zero baseline processing for the autocorrelation calculation results, then calculate the fundamental frequency, and perform multiple iterations until the error of the multiple fundamental frequency calculation results is less than 0.01Hz, the final fundamental frequency The frequency value is the fundamental frequency of the cable.

[0015] The specific calculation process includes the following steps:

[0016] a) Collect the vibration acceleration data of the cable; the acceleration of the cable under environmental excitation can be measured by using a high-sen...

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Abstract

The present invention discloses a method for calculating the guy cable vibrating base frequency, including collecting the vibration acceleration data of the guy cable to implement a zero mean and window adding operation to calculate a power spectrum of the vibration acceleration; based on the power spectrum of the vibration acceleration, extracting near periodic spectrum peaks from the power spectrum of the vibration acceleration by autocorrelation calculation, and processing the autocorrelation calculated result by a zero base line operation; then calculating the base frequency and implementing a plurality of iteration operations until the error of the base frequency calculated results is less than 0.01Hz, the final base frequency value is the base frequency of the guy cable. The invention is capable of calculating the vibrating base frequency of the inclined guy cable accurately to meet the precision requirement for measuring a cable force, improving the base frequency recognition precision effectively, and calculating the vibrating base frequency of the guy cable accurately when the guy cable vibrating signal contains an environment vibration noise signal, thus the invention has good robustness and accuracy.

Description

technical field [0001] The invention relates to a cable force detection method in the field of bridge engineering construction and monitoring, in particular to a calculation method for the fundamental frequency of cable vibration of a cable-stayed bridge. Background technique [0002] At present, among the cable force measurement methods of stay cables, the vibration frequency method is the most widely used method. The so-called vibration frequency method is to use the characteristics of random vibration of the cable when the environment changes to measure the vibration frequency of the cable, and then calculate the cable force of the cable. In this method, the frequency spectrum of the vibration signal collected by the high-precision vibrator is analyzed, and the frequency of each order of the cable is judged by the peak value on the power spectrum, and then the cable force is calculated according to the relationship between the frequency and the cable force. The formula i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/10
Inventor 于徐红谢晓尧刘志杰陈彦
Owner GUIZHOU NORMAL UNIVERSITY
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