Study On Dynamic Performance And Optimization Of The Road-Rail Vehicle

With the promulgation of the "Notice on Further Encouraging Intermodal Transport Work" in 2017 by eighteen departments,the intermodal transport of roads and railways will become the new direction of the development of domestic land freight transport.Road-rail vehicle is a powerful transportation tool for intermodal transport,so it is imperative to research,manufacture and use the vehicle.Because of little research on the road-rail vehicle,it is necessary to have a comprehensive analysis and research on it.Firstly,the paper gives a brief and concise introduction to the development status of the domestic and foreign road-rail vehicle,learn more about the obvious gap between domestic road-rail vehicle and foreign countries.At the same time,a general analysis of the two most widely used road-rail vehicles in foreign countries is taken in order to have a comprehensive understanding of it`s structural characteristics.Then the detailed analysis and research on the structure and the relative motion relationship between rigid bodies of the vehicle and the corresponding pre-modulation processed,and establish the vehicle dynamics model which based on SIMPACK.In order to better evaluate the dynamic performance of the road-rail vehicle,this paper uses the standard GB/T 5599-1985 "Railway vehicles-Specification for evaluation the dynamic performance and accreditation test " as the evaluation standard,and the standard was deeply interpreted.After preliminary assessment,all indicators of the vehicle are in line with the standard.At the same time,it is known that the critical speed and vertical stability indicators in the empty state need to be further improved.For the problem of low critical speed,which improved by optimizing anti-yaw damper mechanism,vertical stability is improved by optimizing the parameters of primary vertical damper.Through the optimization results,it can be known that the preload force need apply to the rubber longitudinal stop of the anti-yaw damper mechanism,and the stiffness also needs to reach a certain value before the anti-yaw damper can fully play its role.The primary vertical damper play an main role in vertical stability and only play a supporting role in lateral stability.Then,by comparing the various dynamic indicators of the vehicle before and after optimization,it can be seen that the anti-snake mechanism plays an important role in the running stability of the empty and heavy vehicles,but has little influence on the riding stability and safety.the primary vertical damper plays an important role in the riding stability of the empty and heavy vehicles,but has little influence on the running stability and safety.Finally,research on the dynamic performance of the anti-yaw damper and the primary vertical damper which easy to fail under the failure.Through the failure study,it is known that the damper at different positions has a significant impact on the dynamic performance.For anti-yaw dampers of empty and heavy vehicles,the impact on the running stability of the vehicle,which on the transition bogie is significantly greater than that on the intermediate bogie.For primary vertical damper,the impact on the running stability of the intermediate bogie is significantly greater than that on the transition bogie.The research results of this paper are expected to provide theoretical guidance for the development of China’s new type of Road-rail vehicle and promote the rapid development of multimodal transport in China.