Cable fundamental frequency characteristic identification method based on S transformation

An identification method and technology of the cable base, applied in force/torque/work measuring instruments, tension measurement, measuring devices, etc., can solve the problems of cable vibration frequency influence, temperature influence, etc., and achieve accurate and reliable cable fundamental frequency characteristics , Improve the signal-to-noise ratio, and have the effect of time selectivity and frequency selectivity

Pending Publication Date: 2019-09-13
JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST +1
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Problems solved by technology

[0003] The frequency method is the most efficient and direct method in the cable force test of cable-stayed bridges, but the vibration frequency of the cable is easily affected by environmental factors such as sensors, wind load and temperature, especially by temperature

Method used

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  • Cable fundamental frequency characteristic identification method based on S transformation
  • Cable fundamental frequency characteristic identification method based on S transformation
  • Cable fundamental frequency characteristic identification method based on S transformation

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Embodiment

[0044] A method for identifying cable fundamental frequency features based on S-transform, comprising the following steps:

[0045] Step 1. Input the vibration monitoring time-domain signal of the cable-stayed bridge cable collected by the acceleration sensor on the MATLAB software platform.

[0046] Step 2. Use discrete S-transform to perform S-transform on the input time-domain signal, express it in the time-frequency domain, and find the time period and frequency band where the noise is located on the time-frequency domain map.

[0047]

[0048] Among them, T is the time sampling interval; N is the number of sampling points; m is the discrete serial number of the time shift factor; n is the discrete serial number of the frequency value; j, m, n=0, 1,..., N-1.

[0049] Step 3, applying a time-frequency filter to the time-frequency domain of the vibration signal of the cable to filter out the environmental noise.

[0050] S c (τ,f)=S(τ,f)H(τ,f) (2)

[0051]

[0052] ...

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Abstract

The invention discloses a cable fundamental frequency characteristic identification method based on S transformation, and the method comprises the following steps of expressing an acquired cable-stayed bridge cable acceleration signal in a time-frequency domain by using S transformation, and finding out noises in different time periods and different frequency bands; filtering noise by an acting time-frequency filter to obtain a time-frequency domain signal of the filtered environment noise; and performing S inverse transformation on the signal subjected to the environmental noise filtration toa time domain, performing fast Fourier transformation on the signal subjected to the environmental noise filtration, converting a time domain signal into a frequency domain signal, and finally identifying the fundamental frequency characteristic. The cable fundamental frequency characteristic identification method based on S transformation can filter the environmental noise interference near thefundamental frequency of the cable vibration signal, thereby highlighting the characteristics of the fundamental frequency of the cable and further obtaining accurate and reliable fundamental frequency characteristic information.

Description

technical field [0001] The invention relates to the field of bridge health monitoring, in particular to an S-transform-based fundamental frequency feature identification method for cables. Background technique [0002] Cable-stayed bridges are widely used in bridge construction because of their good mechanical performance, large span, and beautiful appearance. Cables are the main stress-bearing components of cable-stayed bridges. The safe operation of the stayed bridge is very important. [0003] The frequency method is the most efficient and direct method in the cable force test of cable-stayed bridges, but the cable vibration frequency is easily affected by environmental factors such as sensors, wind loads and temperature, especially by temperature. More importantly, due to the weak energy contained in the fundamental frequency of the cable vibration signal, it is greatly disturbed by environmental noise. Factors such as vehicle driving and wind will cause huge interferen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/04
CPCG01L5/042
Inventor 章世祥曹茂森陆永泉成礼平张贵忠丁军华蒋龙泉汪永兰魏庆阳辛长虹
Owner JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST
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