Study On Impact Of Mechanical Vibration To Catenary Icing

Catenary icing is a common natural phenomenon which has long been a threat to the safety operation of electrified railway. With the rapid development of electrified railway, the problem becomes increasingly prominent. Especially in the event of a severe freezing rain, the catenary is often easily to ice, which may cause that the pantograph can’t take the flow, the normal operation of the line is interrupted and cause serious economic losses. At present, the relevant research focuses on the anti-icing and melt-icing technology, hardly involves in the mechanical de-icing technology. But the mechanical de-icing technology has characteristics of less energy consumption, low cost and convenient operation. Therefore it must have a certain application. In the paper, research on impact of mechanical vibration to icing of contact wires can provide some theoretical reference for the development of mechanical de-icing device.First of all, the paper takes the simple chain hanging catenary as the research object. A finite element model of the catenary is established in ANSYS by discretizing each part of catenary and selecting the appropriate elements. Then the initial equilibrium state of catenary is obtained through the negative sag method. The paper constructs the constitutive model for glaze and simulates with the additional element method. So, the model for iced catenary is established which can provide a basis for study on the mechanical de-icing simulation of iced catenary.Secondly, a status of catenary icing is achieved with the lumped mass method and the de-icing simulation is completed by the de-icing control device on the 150m test platform for catenary of the Laboratory for Rail Transportation. Then study on the de-icing dynamic response of catenary is carried out at the ice-shedding moment. The correctness of the finite element simulation method is proved through comparing its results with the test results.Finally, the paper does some research on the mechanical de-icing simulation of iced catenary. The mechanical behavior of glaze is described by using the isotropic elastic model and the maximum tensile force theory is applied as the element failure criteria. Then the process of de-icing is analyzed under the mechanical shock. Furthermore, the impacts of load type, amplitude and its position to the de-icing effect are studied. At the same time, the de-icing effect of catenary is studied through applying the contact force between pantograph and catenary as the moving force on contact wire when the pantograph runs at low speed. Form the simulation, the mechanical de-icing method can effectively solve the problem of catenary icing.