Study of Singularity Characteristics of Contact Force Signal of High-Speed Railway

Abstract

AbstractWith the improvement of train speed, the contact force signal between pantograph and catenary and its variation on both sides of the dropper point increases sharply, and the current collection quality of pantograph-catenary is deteriorated. The coupled model of pantograph-catenary was established based on the finite element method (FEM) in the study to explore the method of optimizing contact force, and the contact force signal was obtained through calculation and analyzed. First, the wavelet ridge method is used to locate the ridge line of the contact force on both sides of the dropper point; the Lipschitz exponent (LE) method is used to obtain the LE exponent of the contact force on both sides of the dropper point to analyze the singularity of the contact force. It is concluded that the rising rate of the contact force on the left side of the dropper point is smaller than the falling rate on the right side of the dropper point. Second, the relationship between singularity of contact force and the catenary parameters is discussed, which can perform the current collection quality be better.KeywordsPantograph-catenary contact forceSingularityLipschitz exponent