Urban rail transit, with its transport capacity, high-speed time, energy and space, high security and environmental performance by the world's major cities of all ages. Build a rail transit system (subway, light rail, elevated rail alone, etc.) as the backbone of the modern integrated transport system will solve the traffic problems faced by urban development, the basic approach. Urban rail transit vehicles as a direct rail transit system, means of transport, it must meet the special circumstances of the respective cities. The vehicle bogie is one of the main components of the system, it passes a variety of loads, and use the adhesion between wheel and rail have to maintain traction.Bogie structural properties are directly affected by the vehicle's traction performance, operation quality, wheel-rail wear and train safety. Radial gantry by a non-conventional power bogie railway vehicles wheel, frame, drive, basic components such as brakes and suspension form. The difference is that conventional bogies with a truck around by a group composed of independently rotating wheels, and through the body at the bottom after a series of leveraged institutions to adjust the angle of the bogie wheel shaking his head to make it better by the performance curve . This paper demonstrates the development of urban rail transport truck and use status, combined with modern urban rail transit vehicle technology and high-speed EMU technology, design a gantry radial power Bogie. A detailed analysis of radial power bogie gantry operating conditions in a straight line and curve stability through the condition, the initial regulatory agencies to ascertain the form of the radial, and come to a reasonable structure parameters. The use of railway vehicle dynamics, this paper builds gantry radial power bogie dynamics mathematical model of vehicle group, and the use of software to establish the car SIMPACK group model, the kinetic calculations were reasonable and the diameter of suspension parameters to adjust the device structure parameters. Using the optimized set of performance parameters on the car were predictive analysis, reached the following conclusions: 1 to eliminate hunting, so that the critical hunting speed of the vehicle no longer has this problem. Conventional wheel on the structure of the inevitable presence of lateral movement and shaking his head round the coupled motion, we call it hunting. Independent mutual decoupling wheel around the wheel, virtually eliminating the root causes of producing hunting, so it has a high critical speed. 2 rack power bogie curving performance of its very good. The steady state of the performance indicators are much better than the conventional two-axle bogies, and the ability to curve radius less than 100m to achieve force-oriented. Like conventional two-axle bogies, gantry and horizontal power bogie curving there was a contradiction between stability, performance for the lateral stability of the suspension parameters on adjustment, the bogie in the curve does not reach steady-state process the same. 3 shelf truck's smooth rather poor, mainly because of its excitation suffered two axle bogies than conventional large wheel frame to withstand all the excitation is passed to the body, only to pass the two axle bogies half, while the other wheel may be offset by more small. In general, the door frame in the Urban Rail Transit on the road bogie lateral stability and stability are in line with the relevant provisions of the curve by its good performance and is suitable for small radius curves and more rail transit lines, while the ultra- particularly suitable for low floor height of the passengers get on and off, is a promising new type of bogie.
Keywords: radial truck gantry; independently rotating wheel; single wheel; structural design; Dynamic Analysis
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