This research demonstrates improved sensitivity and stability in cable force measurements, indicating a novel sensor approach for long-term monitoring.
This paper proposes an innovative design method for a bypass magnetic flux sensor based on the magneto elastic effect to address the technical challenge of precise measurement of cable force during long-term service of in-service steel cables. By constructing a bypass type magnetic circuit structure and optimizing the magnetic circuit parameters, combined with the unique anti-interference characteristics and low energy consumption advantages of DC pulse excitation technology, the sensitivity and stability of steel cable magnetoelastic effect detection have been effectively improved. A three-dimensional finite element simulation model was established based on the ANSYS Maxwell platform, and the magnetic circuit closure characteristics, magnetic permeability distribution law, and magnetic induction intensity response characteristics of the sensor were systematically analyzed. The simulation results show that the optimized bypass sensor has a stable magnetic induction intensity in the effective working area of the magnetic circuit within the range of 0.64-0.74 T when the excitation current is 1.2 A, located in the maximum magnetic permeability zone of the steel cable magnetization curve. Through physical production testing, its amplitude changes correspond to the cable force load in a definite manner. This provides a new solution for long-term health monitoring of key load-bearing components such as bridge cables and stay cables, and has important engineering application value.
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Wang et al. (2025) studied this question.
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