Abstract
Abstract This work is based on the principle of acoustoelasticity of metallic materials, systematically studied the headcover bolt axial load on-line monitoring, the method of calibration technique based on ultrasound transit time difference and temperature, and case study. By analytical calculation, test, and finite element analysis (FEA), derived the coefficients of acoustoelasticity and temperature, and investigated the bolt thermal stress and the temperature correction method. A scheme for the on-line monitoring of pump-storage turbine headcover bolt axial load is given, providing a reference for important bolt axial load monitoring of hydropower units.
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