| Solving the question that rolling stock directly run through the interplot between different gauges is always a problem that is urgently being solved in international traffic, Adopting the technology of gauge-changeable bogie is the most ideal method. At present, research on the gauge-changeable bogie is blank in China. It is very urgent that the gauge-changeable bogie suiting the situation of our country is developed. Based on that, in order to develop gauge-changeable bogies which are fit for the situation of china and have self-determination knowledge property right, the Ministry of Railways establish especial item to be researched in 2001, the number of item is 2001 J013.In this paper, combining with the science and technology development project for the Ministry of Railways, research on mechanism and structure of a gauge-changeable bogie are firstly carried through in China, the technology design scheme of first gauge-changeable bogie of china is put forward. The scheme design of a gauge-changeable bogie is emphasized, and the corresponding dynamic model is established. Parameters of the bogie are optimized and its dynamics is calculated by computer numerical simulation, and the dynamics behaviors of the bogie are analyzed in detail. Concretely, in this dissertation, the main study work is as follows:1. First of all, research on scheme design of a gauge-changeable bogie is carried through. The study of a bogie's type which include such as the model of wheel, moving mode of wheel, bearing style of loads, locking mechanism, changeable range of gauge, etc., is put up, and based on those, two design projects of the gauge-changeable bogie are put forward. The structures of two projects are introduced in detail, and the second project is an optimal one by analyzing advantage and disadvantage of two projects.2. In order to complete the change of gauge effectively, a gauge-changeable equipment matching the bogie in the ground must be designed. In this thesis, based on the structure trait of the gauge-changeable bogie, a gauge-changeable equipment whose structure characteristic is introduced in the ground is designed, and working principle of the gauge change equipment is expounded.3. The independently rotating wheel is an important part of the whole bogie, Because of not only the gauge-changeable function of the independently rotating wheel, but also difference of wheel-rail creep between the independently rotating wheel and traditional wheelsets, which enormously effects dynamic performanceof the gauge-changeable bogie. In this paper, wheel-rail rolling contact creepages and creeps of independently rotating wheel are analyzed, the effects of lateral and yaw motions of independently rotating wheel, and the curve radius to creepages of wheel-rail rolling contact are emphasisatically researched.4. According to the structure scheme of the bogie, dynamics calculating model of a car with gauge-changeable bogies is established. At the same time, forces of each part of the car are separately analyzed, motion equations of each part are established, motion equations of a car may be gained by joining those of each part. And spring suspension forces among each part of a car are calculated.5. In order to gain the optimal match of dynamics performance, suspension parameters of a bogie are optimized when the bogie is designed. In this dissertation, suspension parameters of the gauge-changeable bogie are optimized by using dynamic program, thereby, the optimal match of dynamics parameters of a bogie is gained.6. According to parameters optimized results, dynamics performance of the gauge-changeable bogie is forecasted in order to analyze its dynamics performance roundly. And its dynamics performance is researched in detail through the comparison of dynamics performance between the gauge-changeable bogie and the traditional bogie. Finally, intensity of the frame that is the most complex component of a bogie is analyzed.Above all things, the main innovation of this disserta... |
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