Magnetostriction-guide-wave-based measurement apparatus and method of short suspender cable force

Abstract

The invention relates to a magnetostriction-guide-wave-based measurement apparatus and method of a short suspender cable force. The apparatus is composed of an excitation bias magnetizer, a receiving bias magnetizer, an excitation coil, a receiving coil, and a guide wave measuring instrument. According to the magnetostrictive effect principle, excitation is carried out inside the short suspender by the excitation coil for long timer to form steady-state vibration; and an induction signal is obtained at the receiving coil based on a counter-magnetostrictive effect and the induction signal is analyzed and calculated to obtain a short suspender cable force. According to the method, with long-time frequency excitation by a magnetostrictive guide wave, the steady-stage vibration is generated in the short suspender; after excitation, vibration signals of the short suspender during the period from the excitation suspending to attenuation to zero are extracted and spectral analyses are carried out to obtain a longitudinal inherent frequency of the short suspender; and on the basis of the correspondence relation of the longitudinal inherent frequency and the cable force, the cable force value of the short suspender is obtained. With the apparatus and method, the cable force measurement is free from limitation of the short suspender boundary condition and the flexural rigidity, so that the measurement becomes convenient; and the measurement repeatability is high.

Description

technical field [0001] The invention belongs to the technical field of bridge cable measurement, and more particularly relates to a method and device for measuring short suspension rod cable force. Background technique [0002] In modern bridge construction, the stress carried by the cable is called "cable force". The measurement of cable force is an extremely important task. The stress state of the cable plays a vital role in the health assessment of the bridge construction and operation process. The role of the bridge requires accurate test results to ensure the safe operation of the bridge. [0003] At present, the commonly used cable force measurement methods mainly include magnetic flux measurement method and frequency vibration measurement method. The magnetic flux measurement method is significantly affected by temperature, and must be corrected for the temperature effect. The electromagnetic sensor must be set on the outside of the cable. There are many types of ca...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of large errors, complicated installation, and inconvenient use in the prior art, the present invention provides a cable force measuring device based on magnetostrictive guided waves for short booms, including an excitation bias magnetizer and a receiving bias magnetizer. , an exciting coil, a receiving coil, and a guided wave measuring instrument, characterized in that:

Images