Magnetoelastic cable force sensor capable of measuring in sliding mode in circumferential direction and measuring system thereof

Abstract

The invention discloses a magnetoelastic cable force sensor capable of measuring in a sliding mode in the circumferential direction and a measuring system of the magnetoelastic cable force sensor. The magnetoelastic cable force sensor is mainly composed of a single U-shaped electromagnet and a sliding rail cylinder in a packaging mode. The measurement method includes the steps that the U-shaped electromagnet is separated from a bridge cable through a rocker, a packaging cover is rotated, the electromagnet is lowered and is fixed to the surface of the bridge cable, sensing signals at the moment are collected, the above steps are executed repeatedly, measuring in at least twelve different directions is finished, the obtained sensing signals are subjected to integral respectively and then are subjected to weighted average, the obtained value serves as the effective integral voltage value and is substituted into the stress-integral voltage reaction of the bridge cable, and the bridge cable stress value can be obtained. Due to the fact that the sensor structure is detachable, installation is convenient, the electromagnet in the packaging can conduct measuring in the sliding mode in the circumferential direction, the influence of the special structure of the bridge cable on the measuring result can be reduced extremely and even eliminated, and the stress value of bridge cables with non-circular cross sections can be measured precisely.

Description

technical field [0001] The invention relates to the field of non-destructive testing, and is suitable for the stress measurement of body cables of bridges and steel cables of various specifications with non-circular cross-sections, and in particular relates to a magnetic elastic cable force sensor for circumferential sliding measurement and a measurement system thereof . Background technique [0002] As an important load-bearing component of a cable-stayed bridge, the bridge cable has long been affected by alternating stress, wind vibration and other factors, which can easily cause local fatigue, excessive stress or concentration or even damage to the bridge cable, endangering the safety of the bridge. The magnitude of stress is an important symbol to measure the structural state of the bridge body. [0003] At present, there are many methods used in cable stress measurement of cable-stayed bridges: hydraulic method, pressure sensor measurement, frequency measurement, magne...

AI Technical Summary

Problems solved by technology

At present, the sleeve-type magnetoelastic sensor that is widely used is not affected by the cross section of the steel cable, but its on-site installation is difficult to calibrate uniformly, and its practical application is limited.

[0005] Patent application number 01240121.8 discloses a piezomagnetic cable force sensor (sleeve-type magnetoelastic sensor) used in the post-tensioned anchor cable system. Although it can accurately measure the stress value of the bridge cable, the disadvantage is that it can only be used in the bridge Installed before the completion of the bridge, the coil needs to be wound on site for the body cable of the completed bridge, which is not only time-consuming and laborious, but also requires high technical requirements for the operator, and it is difficult to achieve a unified calibration of the coil parameters

Patent application number 200610054598.8 discloses a differential temperature-compensated bridge cable force online test method and test system, which not only solves the problems of traditional magnetic elastic cable force sensors in field installation, but also overcomes the influence of temperature on the measurement results , but because it does not take into account the particularity of the bridge cable structure, and the measurement needs to be compared with another unstressed bridge cable, the sensor cannot be practically applied to the stress measurement of the bridge body cable

Images