| As the lightweight trend of subway vehicle car-body becomes more and more obvious,the rigidity of the car-body will be reduced due to the use of lightweight structures such as hollow,and the natural frequency of the car-body will change,which may produce elastic resonance and reduce the running quality of the vehicle.In addition,the operating speed of newly-built subway lines in recent years has also been increasing,which makes it easier to cause elastic resonance in the body of subway vehicles.Therefore,when studying the dynamic characteristics of subway vehicles,the flexibility characteristics of the car body cannot be ignored,and it is necessary to carry out research on semi-active suspension systems for subway vehicles to meet the increasing demands of passengers for subway ride comfort.The main work of this paper is as follows:(1)For a domestic type A metro vehicle,a multi rigid body dynamic model of the metro vehicle is built according to the vehicle parameters,and then the finite element model of the vehicle body is established according to the car-body parameters for modal analysis.The modal calculation results of the car-body are imported into ADAMS/Rail software to establish the flexible car-body subsystem of the metro vehicle,and the flexible car-body subsystem of the metro vehicle is assembled with the rigid steering frame system,A rigid flexible coupling dynamic model of metro vehicle considering the flexibility of car-body is established.(2)The vibration of subway vehicle body is tested on the test line,and the vibration response of subway vehicle body under actual subway operation conditions is obtained.The vehicle running stability index under operating conditions is calculated to verify the rationality of modeling and simulation.(3)The vertical and lateral accelerations of different positions of the vehicle body are simulated under the simulated test conditions of the two vehicle models.According to the vehicle dynamic performance index,the dynamic performance of the vibration response of different models is evaluated and compared with the measured data.The results show that the flexible vehicle body model can show the elastic characteristics of the vehicle body because the main vibration frequency of the flexible vehicle body model and the measured vibration is close to the modal natural frequency of the vehicle body.The vibration acceleration,vibration dominant frequency and vehicle dynamics index of flexible vehicle body are closer to the actual situation than that of rigid vehicle body,which verifies the superiority of rigid flexible coupling dynamics model of metro vehicle.The stability and safety indexes of the flexible body vehicle model are higher than those of the rigid body model.The elastic vibration of the flexible body will have an adverse impact on the vehicle running stability and safety.(4)Based on the flexible vehicle body model of metro vehicle,the research on vehicle body vibration control is carried out.In view of the limitations of single ceiling damping control,the semi-active suspension system of metro vehicle is controlled by combining the fuzzy control strategy based on ceiling damping,and the parameter self-adjusting control strategy is combined on the basis of ceiling fuzzy control.The fuzzy control strategy of constructing factor parameter self-adjusting ceiling further improves the control effect of subway vehicle semi-active suspension system.Finally,the dynamic performance of the vibration response under different control strategies is evaluated.The results show that the lateral vibration of the vehicle body is attenuated more effectively,which fully verifies the effectiveness and feasibility of the factor parameter self-adjusting ceiling fuzzy control strategy,and the dynamic performance of the vehicle is improved to a greater extent compared with the single ceiling damping control. |
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