PARAMETER DESIGN METHOD FOR HIGH-SPEED RAIL DEFECT DETECTION SYSTEM BASED ON DIFFERENTIAL EDDY CURRENT

摘要

A parameter design method for a high-speed rail defect detection system based on a differential eddy current. The method comprises the following steps: first designing a diameter D parameter of a differential eddy current detection coil, so as to match a resolution requirement of cluster crack detection; and then designing an eddy current excitation frequency f parameter of online detection, so as to match the requirements for a high detection velocity v and the maximum defect detection depth dmax. According to the method, the influence of the diameter D of the eddy current detection coil, and the eddy current excitation frequency f on the resolution of different defect depths d is taken into consideration, such that a designed differential eddy current detection system further satisfies detection requirements under high-speed operation, and guidance is provided for the subsequent evaluation of defect depth damage levels of a high-speed rail.