The Design of the Placed Magneto-elastic Cable Force Sensor and the Stress Test of the Steel Cable

Steel cables have the characteristics of large flexibility and high strength, which is widely used in large-scale building structures, traction machinery and large-span bridge projects. The state of the cable force is an important symbol to measure the health state of the steel cable structure, so the state of the cable force must be monitored. In this paper, a magneto-elastic cable force measurement system was built, and a new type of magneto-elastic cable force measurement sensor was developed to solve the problems of complicated installation, large measurement errors, and uneven magnetization of existing sleeve and bypass magneto elastic sensors. Taking the galvanized steel cable with a diameter of 15 mm as the research object, the test study on the measurement of the cable force of the placed magneto-elastic sensor under different excitation modes had been carried out. The test results show that: no matter which excitation method is used, the placed magneto-elastic sensor has higher linearity, under the same test conditions, the semi-envelope excitation method has a better magnetization effect, and its sensitivity is 1.74 times higher than that of the single bypass excitation method, reaching 0.061 mV/kN.