Power transmission tower bolt looseness detection method and system based on correlation coefficient

A power transmission tower and correlation coefficient technology, which is applied to measure torque/torsional force when tightening, can solve problems such as low efficiency, demanding experimental instruments, and affecting noise reduction effects, so as to achieve simple operation, eliminate the influence of noise, and make accurate judgments Effect

CN114777986APending Publication Date: 2022-07-22STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-07-22

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Abstract

The invention discloses a power transmission tower bolt looseness detection method and system based on correlation coefficients, two tower materials are selected from tower materials in bolt connection with a power transmission tower as a tower material 1 and a tower material 2, the method comprises the following steps: respectively selecting to-be-detected points on the tower material 1 and the tower material 2, collecting vibration signals of the to-be-detected points, and calculating the vibration signals of the to-be-detected points according to the vibration signals of the to-be-detected points; at least one point to be measured is selected for each tower material; acquiring a time domain image and a frequency domain image of the vibration signal of each to-be-detected point; solving correlation coefficients of each to-be-measured point of the tower material 1 and each to-be-measured point of the tower material 2 in a time domain and a frequency domain; the bolt looseness condition is detected according to the change of the correlation coefficient, and when the increase proportion of the correlation coefficient is larger than a set threshold value, it is judged that the bolt is loosened; the system comprises a signal acquisition module, an image acquisition module, a correlation coefficient solving module and a judgment module, the power transmission tower bolt loosening condition is detected through a correlation coefficient analysis method, the influence of noise can be eliminated conveniently, operation is easy, rapid and effective, and judgment is more accurate.
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Description

technical field

[0001] The invention relates to the technical field of bolt loosening detection, in particular to a method for detecting bolt loosening of a transmission tower based on a correlation coefficient. Background technique

[0002] The working environment of the transmission tower is complex, and it is repeatedly acted by external loads all year round, which reduces the pre-tightening force of the bolted connection or even loosens, which leads to the decrease of the overall rigidity of the transmission tower. In severe cases, the transmission tower may collapse. Therefore, it is imperative to study a fast and effective method to detect the looseness of the bolted connection structure of the transmission tower.

[0003] Many scholars have done a lot of simulation and experimental research on the loosening of bolted structures. In the detection method, Zhou Jing et al. applied the principle of machine vision to the measurement of the bolt loosening rotation angle, a...

Examples

Embodiment Construction

[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0068] The embodiment of the present invention discloses a method for detecting the looseness of a transmission tower bolt based on a correlation coefficient. Two tower materials are selected from the tower materials connected with the transmission tower bolts as the tower material 1 and the tower material 2, such as figure 1 , including the following steps:

[0069] S1. Select points to be measured on tower material 1 and tower mater...