Contact phase detection method, attack angle measurement method, contact phase detection device, and attack angle measurement device

摘要

PROBLEM TO BE SOLVED: To provide a contact phase detection method or the like capable of accurately detecting a contact phase while suppressing a calculation load. SOLUTION: A contact phase detecting method for detecting a contact phase Φ0 which is a phase of a contact point of a wheel 110 of a railroad vehicle 1 rolling on a rail R with a rail is sequentially applied to a plurality of strain gauges provided on the wheel. The output fluctuation history for one wheel rotation of the wheel load bridge circuits p1 and p2, which are connected and generate the output according to the wheel load, is approximated by the Fourier series, and the contact phase is based on the Fourier coefficient of the third or higher order. Is configured to be obtained. [Selection diagram] FIG. 13