Study On Dynamics Performance Of Road-rail Vehicle On Track

The road-rail vehicle can work not only on the railway but also work on the road.It has received widespread attentions because of the advantages,such as flexible and versatile.At present,with the rapid development of China’s economy,railway and urban rail transit has made a rapid development.Railway network has covered all parts of the country and urban rail transit has also been launched in more than 30 cities.It is very important to study the road-rail vehicle,because there will be more and more demands for the road-rail vehicle in China,but there is few researches about it in our country.In this paper,the traction mode and the structure of the bogie are analyzed,and the development and application status of the road-rail vehicle at home and abroad are introduced.Bogie,an important part of the road-rail vehicle,not only can carry and guide,but also can achieve the transformation of the model of road and railway.According to the structural characteristics and design requirements of the road-rail vehicle,the vehicle used wheel and rail traction guiding mode,bogie used single-axle mode.Compared with the structure of the wheel,axlebox positioning device,frame,central suspension device,driving device and braking device,combined with the road-rail vehicle and single-axle bogie characteristics,determined the bogie mode of the road-rail vehicle.The bogie is a single-axle independent rotating wheel,which is made up of the power bogie and the non power bogie.According to the structures of bogie,the dynamic model of the road-rail vehicle is established by using SIMPACK software.We studied the influence of the first and central suspension parameters of a single axle independent rotating wheel bogie on the dynamic performance of the vehicle by using the established vehicle simulation model.And we selected the appropriate range of parameters of vehicle suspension.Based on the optimized suspension parameters,the dynamic performance of the road-rail vehicle was calculated.The results showed that the dynamics performance index,such as the running stability and the passing of the curve,met the standard of GB/T 17426-1998 and GB/T 5599-1985.When the wheel wore to limit,the vehicle dynamics performance index met the standard requirements.Therefore,the bogie design meets the design requirements.The effect of friction coefficient and gauge on the curve passing performance of uniaxial independent rotating bogie was studied by using the vehicle system dynamic model.The results showed that the appropriate to reduce the wheel rail friction coefficient under the condition of single axle bogie with independently rotating wheels through the curve,lateral force,wheel wear power and derailment coefficient will be smaller,independently rotating wheel group angle changes little.In the case where the actual gauge is widened,and single axle bogie with independently rotating wheels through the curve,the wheel wear power of independently rotating wheels and wheel angle becomes larger,the derailment coefficient and wheel rail lateral force has a smaller decrease.