Research On Operational Safety Of Working Cars For Track Snow Removal Vehicle

To deal with the impact of snow on rail lines and trains,while reducing the security risks posed by snowstorms to railway transport.The design and application of snow removal vehicles is becoming more and more important to railway operation.In China,the development of the snow removal equipment in China is late,and the vehicles specially used for the use of snow removal are short and the safety accidents such as derailment are frequent in the application.Therefore,it is urgent to systematically study the derailment safety of the snow removal vehicles.The research results are of great practical value to improve the safety of railway transportation.In order to ensure the efficiency of the vehicles,there is no suspension between the wheel and the frame.It is not smooth on the line of poor adaptability,while the track snow removal work environment is generally worse.Running wheel load reduction,so to ensure that the track snow removal of the structural reliability and operational safety is particularly important.In this paper,based on the structural characteristics of snow removal vehicles,in the ANSYS software to build snow truck work car frame finite element simulation model.According to the operating conditions of the work car frame static strength analysis.To ensure the safety and reliability of its structure under the premise of the frame has a better flexibility.As the snow truck work car itself does not have a suspension system,in the run by the line is not smooth or external disturbance,the frame will produce elastic deformation,so the size of the frame directly determine the size of the snow car running safety.In order to study the safety of snow removal.First,the equivalent stiffness method is used to equalize the twist stiffness of the frame to the suspension stiffness between the wheel and the frame.The multi-rigid body dynamics model of snow removing is established in SIMPACK software.And then on a variety of conditions in addition to snow truck work car dynamic performance calculation,analysis of the operating conditions of their operating safety.According to the calculation results,this paper proposes to apply the vertical force on the work car,which can effectively reduce the vertical load reduction of the wheel and improve its operational safety.In order to further optimize the dynamic model for the structural characteristics of the snow truck work car.And more accurate simulation to calculate its dynamic performance,the work car body into a flexible body is particularly important.In the study,the finite element analysis software ANSYS was used to establish the flexible body of the working car body.Using the interface program to import it into SIMPACK to generate the rigid-flexible coupling simulation model of the snow removal truck,and then calculate the dynamic performance of the work car under each working condition.Based on GB/T5599-1985 "Railway vehicle dynamic performance evaluation and test identification standard" standard,comparative analysis of the equivalent stiffness of the multi-body model and rigid-flexible coupling model of the dynamic performance of the results.To study the snow car body flexibility on its dynamic performanceThe paper studies show that the flexibility of the car body can improve its curve through the performance.The results of the equivalent stiffness model and the rigid-flexible coupling model are consistent and the error is small.It is proved that the equivalent stifness method is feasible for the safety analysis of snow car.