Research On Mechanical Striking Deicing Method And Device For Catenary

The catenary is an important component of the electrified railway power supply system,which is prone to icing in severely cold areas.Icing on the catenary can cause failures in the power system of rail vehicles,endangering the operational safety of electrified railway lines.With the continuous expansion of electrified railway lines in China,the icing problem of catenary is becoming increasingly prominent.Domestic and foreign scholars have carried out a lot of research on deicing methods for contact line.However,due to the influence of many factors,most deicing methods have not yet been widely applied to the deicing of contact line.Mechanical deicing is a method of deicing by applying external loads to the iced contact line.It has advantages such as high deicing efficiency,low energy consumption,and relatively simple device design,so it has a good application prospect.In this paper,a mechanical striking deicing method,which achieves deicing by using a mechanically driven roller to impact the icing contact line,is studied in detail,and a corresponding deicing device is designed and implemented.In this paper,the mechanical properties of ice,the determination of ice constitutive models and parameters,the deicing response of the iced contact line under mechanical striking and the design of the deicing device are studied.The specific research content is as follows:Firstly,the mechanical properties of ice were tested,and the compressive strength,elastic modulus,and tensile strength of ice under different temperatures and loading rates were obtained.The effects of temperature and loading rates on the mechanical properties of ice were analyzed.Secondly,evaluate the accuracy of different constitutive models in describing the mechanical behavior of ice.Based on the finite element analysis software LS-DYNA,three built-in material constitutive models were used to describe the mechanical behavior of ice,and a numerical model for ice compression testing was established.By comparing numerical simulation results with experimental results,the most accurate constitutive model for describing the mechanical behavior of ice is determined.Further,a sensitivity analysis of the parameters of the constitutive model was carried out to determine the sensitive parameters in the constitutive model,and the sensitive parameters were optimized and calibrated based on the test results.Subsequently,the deicing response of the iced contact line under mechanical striking was studied.The deicing test of mechanical striking on the iced contact line was carried out,and the peak force and deicing length during the deicing process were measured.Based on the previously determined ice constitutive model and its parameters,a finite element analysis model for the deicing response of the iced contact line under mechanical striking was established.By comparing the peak force and deicing length obtained from numerical simulation and experiments,the accuracy of the deicing response analysis model for iced contact line is verified.On this basis,the effects of different factors(impact rate,temperature,ice thickness,and drum diameter)on the deicing response were analyzed.Finally,based on the theoretical analysis results of the mechanical striking deicing method,the deicing device was designed and developed.A physical model of the deicing device was established using SOLIDWORKS software,and a prototype was made.The deicing test of mechanical striking on the iced contact line was carried out.The test results show that the device can effectively carry out deicing operations.