Position-sensorless steel wire rope nondestructive detection equidistant sampling method

Abstract

The invention provides a position-sensorless steel wire rope nondestructive detection equidistant sampling method. The method consists of: processing a magnetic detection sensor signal to obtain a strand wave square wave signal related to a steel wire rope current operating speed and position, and calculating the number of strand wave square wave signal to realize steel wire rope range finding; conducting frequency multiplication on the strand wave square wave signal by a way combining a frequency-locked loop and a phase-locked loop to realize fast tracking of a singular signal; conducting isochronous sampling on the magnetic detection sensor without losing any information on the time axis, and using the strand wave square wave signal to conduct sampling / interpolation on the isochronous sampling data so as to obtain accurate equidistant sampling data; and employing a pre-estimated strand wave square wave signal to conduct sampling / interpolation on the isochronous sampling data, thus avoiding the influence of defects on data acquisition. The method not only realizes steel wire rope range finding, but also realizes position-sensorless equidistant sampling, greatly improves the accuracy of equidistant sampling, and is more beneficial to recognition of steel wire rope nondestructive detection defects.

Description

technical field [0001] The invention relates to the technical field of detection and measurement, in particular to an equidistant sampling method for steel wire rope distance measurement and steel wire rope non-destructive testing. Background technique [0002] In the field of wire rope non-destructive testing, in order to facilitate signal analysis and positioning of defects, equidistant sampling is often used for signal extraction, so the distance sensor is a very important part of it. At present, the way of connecting the guide wheel and the code wheel is often used. With the operation of the wire rope, the guide wheel rubs against it and rotates. The encoder connected to the guide wheel generates an equidistant pulse signal, which is used to realize equidistant sampling of the wire rope. When the guide wheel is in contact with the wire rope, it is easy to cause idling and slipping, especially when the detection environment is relatively harsh and foreign objects are atta...

AI Technical Summary

Problems solved by technology

When the guide wheel is in contact with the wire rope, it is easy to cause idling, slipping, etc., especially when the detection environment is relatively harsh and foreign objects are attached to the wire rope, which will cause errors in signal acquisition.

The guide wheel is running against the steel wire rope for a long time, and both of them will wear to a certain extent, resulting in accumulated errors

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