Research on time–frequency characteristics of contact force based on wavelet transform

When a train runs at high speed, affected by the structural characteristics of catenary, contact force changes periodically with span and dropper spacing. However, as running speed increases, periodic signal owing to fluctuation catenary vibration pantograph, which directly affects stable between pantograph catenary. Therefore, based on simulation research method, this study uses time–frequency transformation method investigate influence in structure force. First, design existing railway line is carried out changing length stitch wires spacing, stiffness curvature variation when arrangement varies are analysed. Then, relationship stiffness, variation, Finally, wavelet transform used force, variations key amplitude component analysed parameters changed, period obtained. By analysing technical support for improving can be provided.