Study On Frictional Self-Excited Vibration Of A Pantograph-Rigid Catenary System

Rigid pantograph-catenary systems are widely used in subway lines because of their simple structure,convenient maintenance,no tension,and low resistance.Although the rigid pantograph-catenary systems have these advantages,it has been found that many contact wires are subjected to corrugation.Contact wire corrugation will definitely deteriorate the contact relationship of pantograph-rigid catenary systems and affect the current-carrying quality of the pantograph-rigid catenary systems.For rigid overhead catenary,the generation mechanism of contact wire corrugation has not yet been understood completely.Therefore,it is of great significance to study its mechanism and obtain measures to eliminate or suppress contact wire corrugation.Based on the theory of friction-induced self-excited vibration causing corrugation,the author uses the ABAQUS finite element software to establish the friction-induced self-excited vibration model of the pantograph-rigid catenary system and conducts complex eigenvalue analysis and transient dynamic analysis to study the generation mechanism of contact wire corrugation,and effects of pantograph-rigid catenary parameters on contact wire corrugation.The measures to eliminate or suppress contact wire corrugation are obtained.The main research contents and results of this thesis are obtained as follows:（1）In this dissertation,the complex eigenvalue method is used to conduct an analysis of the occurrence propensity of the friction-induced self-excited vibration of the pantograph-rigid catenary system.It is predicted that the possible frequency of contact wire corrugation is ?=818.01 Hz.According to the traveling speed of metro trains,it is inferred that the wavelength of contact wire corrugation λ=20.4 mm at this time.The corrugation wavelength is very close to the field measurement wavelength,indicating that the prediction model of contact wire corrugation is basically valid.（2）The process of the pantograph sliding against the catenary was simulated by using transient dynamic analysis method,and the time-domain response of the dynamic contact force,the vibration of the strip and the contact wire are analyzed,It is found that the friction-induced self-excited vibration of the strip and the contact wire causes the dynamic contact force fluctuation to form the contact wire corrugation,and the friction-induced self-excited vibration mainly occurs in the normal direction of the strip and the contact wire.（3）Using the complex eigenvalue method,the effects of several pantograph-rigid catenary parameters on the contact wire corrugation were studied,The research results show that when the friction coefficient μ≥0.15,the friction-induced self-excited vibration of the pantograph-rigid catenary system will occur at the frequency ?=818.01 Hz,and this friction-induced self-excited vibration causes the rigid contact wire corrugation.When the friction coefficientμ<0.15,the contact wire corrugation can be significantly reduced;when the static contact force F≤110 N,the contact wire corrugation can be effectively alleviated;when the pantograph-head suspension torsion spring stiffness K=100 N·m/rad,the contact wire corrugation is less likely to occur;When the span between two supports L=6 m,the contact wire corrugation can be effectively alleviated;when the contact wire wear depth d=1.0 mm,the pantograph-rigid catenary system has the smallest trend of contact wire corrugation;when the elastic positioning clamp spring stiffness K₀=6×10⁵ N/m,it has the strongest ability to inhibit the contact wire corrugation;the elastic bolt has little influence on the occurrence trend of the contact wire corrugation;Copper-silver alloy contact wire and elastic insulator can reduce the possibility of contact wire corrugation.