| Low floor light rail vehicle is a new type of urban rail transit vehicle,which has the characteristics of low cost,moderate volume,convenient and environmental protection.With the development of technology,100% low floor light rail vehicle with fully connected vehicle floor has become its latest generation.In view of the late start of domestic 100% low floor light rail vehicle,there is still a lot of room for vehicle development,this paper puts forward a new structure of 100% low floor light rail vehicle bogie,and establishes the vehicle dynamics model based on it,focusing on the study of the secondary suspension characteristics of the vehicle,in order to provide some theoretical reference for the development of 100% low floor light rail vehicle Learn from.Firstly,the structure form and bogie structure characteristics of 100% low floor light rail vehicles at home and abroad are summarized,and an independent rotating wheel bogie suitable for small and medium-sized cities in China is put forward.According to the design structure,a three-module vehicle grouping model was established in the multi-body dynamics software.After the vehicle suspension parameters are optimized by setting the working conditions,the vehicle dynamics performance matching the best suspension parameters is analyzed.The results show that the vehicle running stability,running stability and curve passability can meet the requirements.In order to optimize the turnaround frame structure,the required displacement capacity of the transmission system coupling was calculated based on vehicle dynamics.Suspension device is the key factor affecting the running quality of vehicles.This paper takes the free film air spring for light rail vehicles as the research object,and establishes the nonlinear dynamic model of vertical,horizontal and torsional of the secondary suspension air spring based on the aerodynamic theory and function fitting method,and describes the calculation method.In order to explore the influence of air spring characteristics on vehicle dynamics performance,the air spring model and vehicle dynamics model were co-simulated.The influence of torsional stiffness of air spring on curve crossing ability of 100% low floor light rail vehicle is analyzed.The results show that the torsion stiffness of the air spring makes the relative torsion Angle of the vehicle body become smaller when the vehicle passes through the curve,and the passability indexes of the vehicle curve decrease to different degrees.A stick-slip contact model was established to investigate vehicle dynamic performance in air spring fault mode.It is found that after the failure of the air spring,the running smoothness becomes worse but still meets the riding requirements,and the ability to pass through the curve decreases more seriously.After the failure of the air spring,it should slow down.Based on the simplified stiffness matrix of air spring,the coupling stiffness matrix of air spring is derived,and the difference between two kinds of vehicle modeling methods is compared.The results show that: under the set conditions,the dynamic performance of the vehicle modeled by the air spring coupling stiffness matrix is better than that modeled by the air spring simplified stiffness matrix,especially the derailment coefficient and wheel load reduction rate are quite different between the two vehicles.Therefore,when the two indexes are taken as the research object,it is suggested to use the coupling stiffness matrix to simulate the overall stiffness characteristics of the air spring. |
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