Dynamic Simulation And Optimization Design Of AMT Shifting Mechanism

The design and optimization of gear shifting mechanisms is a difficult task in the process of AMT development. The dynamic characteristics of AMT has a direct impact on the reliability and performance of the vehicles. With the development of diversiform technology, and an increasingly competitive AMT market worldwide, some experts have put forward higher standards for AMT performance. Therefore, the research and development in gear shifting mechanisms has become ever-increasing concern in education-related enterprises.Shifting process occurs within a very short period of time. Due to the complexity of the internal shifting mechanisms in AMT, it may be affected by a number of factors. Also, it is difficult to capture the moment of a dynamic process and to consider such a contradictory design by traditional methods of calculation and experimentation. Consequently, the design of the gear shifting mechanisms in AMT can only be relied on the experiences in the past. As the CAE technology evolves and expands, many small business have begun to adopt the "design with experience, optimization with software" mode and achieved impressive results.This dissertation takes the multi-shift AMT as an object of study, and with the CAE technology, the following tasks have been done:(1) The structure and operating principle of the AMT shifting actuator and synchronizer have been fully elaborated, and the calculation of the input equivalent moment of inertia has been successfully completed, as well as its time of synchronization;(2) In terms of the multi-shift AMT, the general process of the multi-body dynamic simulation has been discussed in detail, which can be divided into two phases:modeling and solving, and the principal methods of calculation have been clearly illustrated;(3) On the basis of the position of and compatibility between the parts, a rigid-flexible coupling model has been constructed thus to perform the dynamic simulation with Adams, which is a model perceived as elastically flexible. But through trial and error, the accuracy of the model has been verified;(4) According to the simulation results, the method of mechanical simulation has been studied in depth, and several important criteria for evaluating AMT shifting performance have also been analyzed;(5) Based on the results of dynamic simulation, the strength of key parts have been analyzed through static and dynamic methods, finally the stress concentration of fork has been eliminated and the weight of plate has been reduced through structure optimization.The dissertation helps to clarify the qualitative understanding of the gear shifting mechanisms in AMT, and at the same time provides objective evaluations and optimization for AMT shifting performance, which is of great theoretical and practical significance for further improvements of AMT shifting performance in the future.