| To speed up passenger trains and decrease journey time are one of the targets of the world railway modernization, and also an effective means to increase competition in transportation market. Therefore, China has opened a line of 200km/h high-speed EMU and started to build about 16,000 km high-speed passenger lines since April 18th 2007,which consists of 4 lines from east to west and another 41ines from south to north. Considering the national conditions, China's railways transportation can not step into a new stage but speed up trains in the existing lines, because there are still more than 70,000 km of existing lines. However, the curve radius of existing lines restricts the further increase of the speed of the train. The curves length of the existing lines contributes the one-third of the total length of railways, especially in the vast territory of the western China. In order to increase the passing velocity in curve lines and compensate limitation of the deficient superelevation, tilting train is the one of the effective solutions.Tilting control system, which accomplishes the tilte of vehicle, is a key part of tilting train. Tilting actuator is the core of tilting control system and it also is the power source of tilting.As the combination of hydraulic technology and micro-electronic technology, electro-hydraulic servo technology has developed very rapidly. A new type of actuator—direct drive volume control electro-hydraulic servo actuator appears as a result of AC variable-frequency driving technology in the hydraulic servo control field. Direct drive volume control electro-hydraulic servo actuator has advantages in the good flexibility of AC servo motor and large density in hydraulic power. The system obtain greater economic benefits and gets implemented in a number of others field because of its high reliability, high energy-saving efficiency, easy-to-operate and integrated model.In China, the research of direct drive volume control electro-hydraulic servo actuator generally focused on energy-saving, but it's rarely applied in position servo control. Based on development of the direct drive volume control electro-hydraulic servo technology, a new type of actuator—direct drive volume control electro-hydraulic servo actuator is designed for tilting train in this paper. It has important theoretical and practical significance for tilting train technology in China.The paper present several foreign tilting train actuator and several tilting mechanism in some countries at first, And then, various mechanisms are compared and analyzed. The paper takes the four-link tilting mechanism as the research object, and uses numerical simulation software MATLAB for programming to obtain the required parameters for direct drive volume control electro-hydraulic servo actuator.Secondly, the principle of direct drive volume control electro-hydraulic servo actuator is presented. According to the requirements of tilting control system, the design of the structure of direct drive volume control electro-hydraulic servo actuator is completed. The solid model of the actuator is accomplished by using three-dimensional modeling software Pro/ENGINEER.Finally, the actuator is simulated by using the Advanced Modeling Environment for Simulations of engineering systems (AMESim) . During the simulation, several performance parameters and verifies the correctness of the actuator system are analyzed. ADAMS software helps to establish the tilting dynamics model of tilting train, accomplish the co-simulation of tilting system. The results show that the direct drive volume control electro-hydraulic servo actuator has good qualification in dynamic performance and can meets the capacity requirements in the tilting control system.
|
PDF Full Text Request