Simulation And Experimental Study Of Working Mechanism Of Mechanical Transmission Synchronizer

At present,the domestic enterprises urgently need to develop high-quality mechanical transmission,and the excellent performance of the synchronizer has an important role in shift quality.Therefore,according to the development status of domestic synchronization technology,and combining theoretical research and practical needs of projects,this dissertation makes deep and systematic research on the influence of the structure parameters of synchronizer on the shift performance,on endurance test index of synchronizer,and on sensitivity analysis of synchronous impulse.Chapter 1,Firstly,introduced the influence of the policies and regulations on the mechanical transmission,and the main development direction of mechanical transmission.Then,the research status of synchronizer at home and abroad was analyzed,but it was rarely involved in the following three aspects:(1)The simulation model used in the previous research only concerned the mechanical part,without the friction model of synchronizer friction cone.(2)The objective evaluation index of synchronizer durability test has not been put forward yet.(3)The weights of the design parameters of synchronizer structure have not been analyzed yet.For these 3 points,we formulated corresponding research objectives and research route.In the second chapter,the principle of synchronizer was analyzed,and the working process of synchronizer was divided into 7 stages,namely: the first free fly,start of angular velocity synchronization,angular velocity synchronization,turning the synchro ring,second free fly,second bump,and the final free fly.The dynamics of each stage was analyzed,and the corresponding mathematical model was established.Chapter 3 introduced the design principle of the shift performance test bench and the synchronizer durability test bench,and introduced the test method and the test notes of the shift performance test and the synchronizer endurance test.In this paper,according to the actual needs of projects,we built a set of shift performance test bench.Finally,the shift performance test was carried out for a gearbox,and the test data was analyzed.In the third chapter,firstly,based on AMESim+SIMULINK,the Co-simulation model of shift system was established.Then,a set of shift performance test bench was built.And the shift performance test was carried out for a gearbox.Then,the correctness of the simulation model was verified by comparing the simulation data and test data.Finally,based on the simulation model,the influence of the design parameters of the synchronizer on the shift performance was studied.And shift work was briefly analyzed.In the fourth chapter,according to the endurance test of synchronizer,a kind of evaluation index,which can be used to judge the failure of synchronizer,was presented.Then,the main influence parameters of the evaluation index are studied.In the fifth chapter,the influence of 4 parameters on the synchronization impulse was calculated by the simulation model.And by using the RBF neural network,a network map of the 4 parameters and the corresponding synchronization impulse was established.And the correctness of the network mapping was proved by error verification and correlation analysis.Finally,based on the weights of each neuron in the network,the influence weights of these parameters on the synchronization impulse were obtained.And it provided the basis for the optimization of the synchronizer.