| Urban rail transit is an important tool to solve traffic congestion and alleviate environmental degradation.Subway as a necessity with the development of the city,its operational safety and stability is an important issue for people to study.Subway gear box as a key vehicle transmission parts,poor working environment,the vibration and noise can be transmitted to the body through the bogie,affecting the ride experience,and the box often rupture and other failures,affecting the safety of train traffic.In this paper,the dynamic response of the subway gear box is studied,which provides the basis for the subsequent optimization of the gear structure and the safe operation of the train.In this paper,the dynamic response of the dynamic response of subway gear transmission system is studied.(1)In this paper,the structure of subway gear transmission system is analyzed.The vibration mechanism of gear transmission system is introduced.In order to obtain the overall structure of the gear box,the local feature has little effect on its conclusion.When the gear box model is established,the upper and lower boxes are neglected.Body bolts and other components of the impact of modeling the necessary simplification.The three-dimensional model is well matched with the object,which can be used to replace the physical model.(2)the modal analysis of the box,harmonic response analysis and random vibration analysis,access to the natural frequency of the box,and put forward the dangerous frequency value,the train operation should try to avoid the natural frequency of the box,gear meshing frequency and drive shaft rotation The frequency of the same or close to the situation.Can be adjusted by adjusting the speed and gear teeth to adjust the gear meshing frequency to avoid the resonance phenomenon.The feasibility of the finite element method is proved by the experimental modal analysis,which is helpful for the designers to optimize the gear box structure reasonably and improve the weak links of the gearbox.On the other hand,based on the development of the transmission system technology,it can adjust the operation strategy of the rail train or change Design ideas.(3)Taking the physical model of the subway gearbox as the research object,the data conversion of the Cero and ADAMS data interface is carried out,and the gear box is flexible by means of ANSYS.The flexible body is replaced by the flexible body.The model of gear contact is established,and the bearing pair is built by ADAMS built-in mechanical package module,and the dynamic coupling model of metro gear box is established.(4)According to the simulation results of the gearbox dynamic analysis,the analysis of the box in the gear start and the acceleration phase there is a large vibration impact,and compare the stress and strain of the measured point of view,the upper box was significantly more than the box The vibration response of the upper box and the upper part of the upper box are affected by the signal superposition and so on.The stress response can be considered.It is possible to consider the optimization of the box structure,consider adding the reinforcement and other measures to strengthen the dangerous node stability.Based on the dynamic simulation of the rigid and flexible coupling dynamics model of the subway vehicle gear box established by ADAMS,this paper can carry out comprehensive performance evaluation in the early stage of product design,accurately predict its dynamic performance,reduce the experiment and R & D cost,The design level of the gear box is improved and the train operation is smooth and comfortable.It has important theoretical significance and engineering application value. |
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