Research On Vehicle-bridge Coupled Vibration Based On Multi-body Dynamics And Finite Element Method

With the development of high speed railway in our country, the total mileage of China’s high-speed railway will hit a record. Because the bridge structure has little influence on the local traffic, therefore railway bridge is widely used in railway construction. After the completion of the bridge, the running state of the train on the bridge and the safety of the bridge has also attracted people’s attention. So the study of vibration mechanism of train and bridge to reduce the vibration of vehicle-bridge coupled is very necessary.Based on the Co-simulation of Multi-body dynamics software SIMPACK and finite element software ANSYS research vehicle-bridge coupled vibration in this paper. This method is more efficient than previous programming, then this method can consider the changes in various parameters of vehicle and bridge impacted on vehicle-bridge coupled dynamic. Providing a new method for the analysis of vehicle-bridge coupled vibration. Based on the above method, the main work of this paper is as follows:1、A vehicle model with 42 degrees of freedom was established by multi-body dynamics software SIMPACK. The nonlinear factors are considered in the model and the dynamic response of the model is calculated. The results showed that: Dynamic indexes of train meet the general rules of the vehicle to verify the correctness of the model.2、Some basic methods of bridge finite element model are summarized and the principle is given about calculating dynamic response of bridge by mode superposition method. Lists the criteria for evaluating the safety of bridges and vehicles. A detailed description of realization and principle about co-simulation.3、Based on the above theoretical analysis vehicle-bridge coupled vibration of the 64 m Steel Truss Bridge. The results showed that: Dynamic response of Train and bridge which is in the relevant range of state regulations meet the safety when the train cross the bridge. At the same time, time-history curves of dynamic response about train and bridge is to meet the general rules of the vehicle-bridge coupled vibration. Demonstrating that the method is feasible and effective.4、Considering the Track irregularity influence the coupling vibration of the high-speed railway box girder bridge. The results showed that: Track irregularity has a certain effect on the train and bridge. Although the irregularity sample only increases a little, the influence of the dynamic response of the vehicle is very obvious. For the bridge, the vibration and deformation of the track will increase with the increase of track irregularity at the same time.That shows track irregularity is one of the major source of vehicle bridge coupled system.5、This paper also considered the different wheel treads effects on vehicle-bridge coupled vibration and comparing with the commonly used LMA tread and LM tread. The results showed that: The vibration and deformation of the bridge are not affected by the different wheel tread. Choosing different wheel treads has a certain influence on the stability of the vehicle at the same time. With the speeding up,the use of LMA tread to enhance the stability of the vehicle is better than the use of LM tread especially in the vehicle lateral stability.Therefore, the comparison shows that the LMA tread is more in line with the match of the high-speed wheel and rail profile. Based on the above analysis,the use of LMA tread can better reduce the dynamic response of vehicle-bridge coupled while improving the safety of the bridge and the comfort of the train.