Design And Research On Semi-Active Lateral Damper Of High-Speed Train

High-speed train is the development tendency of railway passenger transport in the world, and it is also the main method to improve the market competitiveness of Chinese railway transport. Railway acceleration has brought a series of problems while shortening the travel time between cities. Among them, the severe lateral vibration is one of the main obstacles to high-speed train. Suspension system plays a critical role in improving the dynamic performance of railway vehicles. It is effective to adopt the semi-active suspension system which can make real-time adjustment of parameters according to the running condition of railway vehicle to improve the running stability, comfort and safety of the train. The semi-active suspension using damper with variable damping force has many advantages such as low energy consumption, good safety and relatively simpler structure. In recent years, it has aroused the great concern of the railway vehicle development personnel.Semi-active lateral damper is the key component of semi-active suspension system. It can adjust the damping force according to the running condition of railway vehicle, thus improving the lateral vibration condition of railway vehicle. The semi-active damper needs little external energy. Besides, the good effect of vibration isolation and its easy installation and maintenance lead to its wide application prospects.The control strategies of semi-active lateral damper on railway vehicle and its control principle of lateral vibration in lateral direction were addressed, and the structure scheme of semi-active damper was designed. The structure and working principle of semi-active lateral damper were elaborated specifically, and the theoretical analysis was done in all kinds of work conditions. The structure of semi-active lateral damper was designed according to the requirements of semi-active suspension system on railway vehicle. And its solid model was accomplished by using the three-dimensional modeling software Pro/ENGINEER.The hydraulic system of semi-active damper was simulated and analyzed by using the Advanced Modeling Environment for Simulation of engineering systems (AMESim), the design and theoretical analysis of hydraulic system was proved to be correct.The multi-field co-simulation platform was established by using interfaces between virtual prototyping software, the dynamic simulation model of railway vehicle. The model of hydraulic system and control system of semi-active damper were established in ADAMS/Rail, AMESim and Simulink respectively. At last, the multi-field co-simulation and analysis were accomplished. The influence of semi-active damper on the lateral vibration of car body and bogie was studied by way of simulation and analysis, and the results were compared with passive damper. At the same time, the dynamic performance of running vehicle whose semi-active damper failed was studied. The results show that the semi-active damper has ability to weaken the lateral vibration of the car body and improve the riding comfort of the train. In addition, it has good guiding performance in failure state, which ensure the safety of the running train whose basic indexes of stability can be guaranteed when the control system fails.This paper is funded by the national 863 reseach project "EMU Elastic Components for Reducing Vibration and Noise" (2008AA030706).