Principle of the steel cable tension measurement based on spatial magnetic field distributions

摘要

It is of great significance to measure the axial tension of a steel cable for its safe operation. The magnetic hysteresis loop of the cable can change with its axial tension, so the cable tension can be measured through acquiring magnetic parameters from its hysteresis loop. This is so-called measuring method based on magnetomechanical effect. We should note that a changing magnetic field must be excited to acquire magnetic parameters relevant with the tension in this method. Currently, the excitation magnetic field changing with time is usually adopted, which makes the measurement complex and time-consuming. So this paper puts forward a principle of the steel cable tension measurement based on spatial magnetic field distributions. The magnetic field changing in a special area along the axial direction is used to replace time-dependent magnetic field in the conventional testing method. Therefore, this measurement is relatively simple and fast.