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Fundamental frequency identification method in cable force detection

An identification method and cable fundamental frequency technology, applied in tension measurement, vibration measurement, measuring device, etc., can solve the problems of inability to clearly detect the cable fundamental frequency, inability to accurately obtain the cable fundamental frequency, etc., so as to eliminate low-frequency interference. Noise, improved accuracy, cleverly conceived effects

Active Publication Date: 2015-03-25
HUNAN TIANGONG CONTROL TECH
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Problems solved by technology

[0005] The present invention is to solve the problem that the existing technology cannot clearly detect the fundamental frequency of the cable and cannot accurately obtain the fundamental frequency of the cable. Fundamental frequency identification method in cable force detection with reliable guarantee of fundamental frequency

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  • Fundamental frequency identification method in cable force detection

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Embodiment Construction

[0024] The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. 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.

[0025] Such as figure 1 As shown, the basic frequency identification method in the cable force detection of the present invention is to install an acceleration sensor on the cable and connect a portable data acquisition instrument, that is, an industrial computer, and a PC to control operations such as data acquisition, real-time display and data processing, and the specific process is as follows: :

[0026] (1) Install an acceleration sensor on the cable and connect it to a portab...

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Abstract

The invention relates to a fundamental frequency identification method in cable force detection. The method comprises the steps that fist, the time domain vibration signals of a cable are collected, and then the collected time domain vibration signals are regulated to obtain time domain vibration response signals; the obtained time domain waveform signals are preprocessed and subjected to self-power spectrum analysis, so that a first spectrogram containing the cable fundamental frequency is obtained; the obtained time domain waveform signals are subjected to wavelet packet reconstruction, and then the signals are subjected to self-power spectrum overlapping multiplication processing to obtain a second spectrogram related to the cable; the first spectrogram and the second spectrogram are compared to finally determine the fundamental frequency of the cable. According to the method, the design is ingenious and reasonable, low-frequency interference noise can be effectively eliminated, the cable signals are analyzed through a double-spectrogram method, the precision for obtaining the fundamental frequency is improved, and the clear and accurate cable fundamental frequency can be obtained.

Description

technical field [0001] The invention relates to a cable force detection method, in particular to a fundamental frequency identification method in cable force detection. Background technique [0002] Cable force is an important technical parameter in the field of cable force detection for cable-stayed bridges, suspension bridges, etc. It must be able to accurately measure the cable force in the design, construction, future maintenance, and state assessment processes. Therefore, accurate and rapid evaluation of cable force has important engineering practical significance. [0003] At present, there are mainly the following methods for measuring the cable force: pressure gauge measurement method, pressure sensor measurement method, magnetic flux method and frequency method. The pressure gauge measurement method is to calculate the tension force of the jack based on the oil pressure in the tension cylinder of the jack, which is the cable force. It is bulky, inconvenient to mov...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/14G01L5/04
Inventor 梁宝龙士国邹凤李印王鹏为
Owner HUNAN TIANGONG CONTROL TECH
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