Study On Dynamic Behavior Of High Speed Vehicle With Component Failures

With the rapid development of railway in our country,the high speed EMU attracts more and more attention.With the continuous improvement of the operating speed,the safety and reliability of the high speed train are more prominent.The working state of the key parts of the running part of the high speed train is an important factor affecting the safe and reliable operation of the train.Once the key parts of the high speed train go wrong or fail,it may lead to serious traffic accidents.In this paper,the dynamic performance and behavior of the high speed EMU are studied,such as the failure of the primary or secondary damper,the failure of the air spring and the polygon of the wheel.Specific research contents are as follows:Firstly,the dynamic simulation model of the high speed EMU is established by using SIMPACK software.At the 250km/h-380km/h speed,the dynamic performance parameters of the vehicle with different types of faults and different fault severity for shock absorber and air spring is calculated to understand the changing trend of vehicle dynamic performance with different faults.Secondly,the dynamic behavior of the different vehicle parts of damper and the air spring with different fault types and different severity at 250km/h,300km/h,350km/h three speed grades are studied.The time and frequency characteristics of dynamic response signals of vehicle body and frame are analyzed.The relationship between the failure of the bogie suspension components and the response of the vehicle system is obtained,which provides a rational understanding of the research on the fault detection and fault location of the suspension components.Finally,using ANSYS software and the FEMBS module of the SIMPACK software,the wheel set is made of elastomer.The influence of 19 order polygon on vehicle vibration and wheel/rail force is studied in the rigid-flexible coupling dynamics model.At the same time,the influence of different order of wheel polygon on wheel rail force is studied.According to the amplitude of wheel rail force,the safety limit value of wheel polygon amplitude under 300km/h is proposed.