Bridge cable force state monitoring device and method based on weak grating array
A technology of condition monitoring device and weak grating, applied in the direction of measuring device, force/torque/work measuring instrument, instrument, etc., can solve the problem of not being able to monitor the cable force online, and achieve the effect of novel technology
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Embodiment 1
[0055] see figure 1 — Figure 7 , a bridge cable force state monitoring device based on a weak grating array, comprising a weak grating array sensing optical cable 3, a fiber grating vibration demodulator 2 and a vibration signal processing unit 1, the weak grating array sensing optical cable 3 is The surface of the measuring cable 4 is axially arranged, the surfaces of the weak grating array sensing optical cable 3 and the measured cable 4 are attached to each other, and the end of the weak grating array sensing optical cable 3 passes through the fiber grating vibration demodulator 2 and the vibration signal processing unit 1 Signal connection; coaxial sensing optical fiber 31 is arranged inside the weak grating array sensing optical cable 3 , and a plurality of weak gratings 311 are arranged at equal intervals on the sensing optical fiber 31 .
[0056] A monitoring method for the bridge cable force state monitoring device based on the weak grating array, comprising the foll...
Embodiment 2
[0058] Basic content is the same as embodiment 1, the difference is:
[0059] The cable 4 to be tested is a cable-stayed cable with a length of 20.28 meters. The diameter of the weak grating array sensing optical cable 3 is 6mm, and the distance between adjacent weak lights and 311 is 2.028 meters. -30dB, the center wavelength is 1552nm, the number of weak light, 311 is 11, arranged at equal intervals, the tested cable 4 is divided into ten sections by 11 weak gratings 311 .
[0060] The monitoring method consists of the following four steps in sequence:
[0061] (1) Extract the vibration data of the stay cable: extract a period of 8-second vibration time-history data of the stay cable every 2 minutes as the vibration response signal, such as Figure 5 shown;
[0062] (2) Fundamental frequency identification of cable-stayed cable vibration: Firstly, perform FFT transformation on the extracted vibration response signal to obtain the vibration spectrum, then calculate the fund...
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