Study on Frictional Self-Excited Vibration of a Elastic Rail Collector System
In order to study the vibration characteristics of a elastic rail collector system,a finite element model of the collector-conductor rail system was established based on the actual measurement of vibration acceleration and noise sound pressure of the system.The complex eigenvalue analysis method was used to study the influence of the friction coefficient between collector and conductor rail,the wear of the metal-impregnated carbon board,the position between collector and conductor rail and the magnitude of the lifting force on the occurrence trend of frictional self-excited vibration.The results indicate that the dominant frequencies of vibration acceleration and noise sound pressure are 1 450.2 Hz and 1 458.1 Hz respectively.Unstable vibration appears on the system when the friction coefficient is greater than 0.21,and with the in-creasing of the friction coefficient,the propensity of the unstable vibration tends to increase.As the wear of the metal-im-pregnated carbon board increases,the trend of the unstable vibration on the electric collector-conductor rail system increa-ses.Frictional self-excited vibrations are more likely to occur when the electric collector is located at the expansion joint position of the conductor rail.Under different lifting force,the frictional self-excited vibration appears around about 1 459.6 Hz.When the friction coefficient is less than 0.21 and electric collector's lifting force is about 630 N,the friction-al self-excited vibration of the collector-conductor rail system can be restrained,thereby the stability of current collection can be improved.
electric collectorconductor railfriction self-excited vibrationcomplex eigenvalue analysismetal-impreg-nated carbon board
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