Dynamic Analysis Of Simply Supported Beam Monorail Vehicle With Differential Mechanism

As a kind of urban rail transit system,straddle monorail transportation has become an important choice for medium-sized cities to solve traffic congestion problems because of its low cost,low noise,strong climbing ability and small turning radius.In the operation practice of Line 2 and Line 3 in Chongqing,we found that monorail vehicles have serious problems such as heavy wheel wear,frequent tire replacement and high operating costs.In order to solve the problem of high erroneous wear of the straddle monorail vehicle and the actual operating cost,the research team proposed a design scheme of a simple-supported beam monorail with differential structure.In this paper,the dynamic performance of a simple-supported beam monorail vehicle with differential structure is studied.The main research work and achievements are as follows:(1)On the basis of studying the structure of Chongqing straddle monorail single-axle power bogie,the structural characteristics of the simply supported beam bogie with differential structure are analyzed,and the longitudinal,lateral and vertical power transmission characteristics of the bogie are obtained.(2)Study on the dynamics modeling of a simple-supported beam monorail vehicle with differential structure.The vehicle topology relationship structure is created,the vehicle modeling parameters and the orbit modeling parameters are analyzed,and the multi-body dynamics software SIMPACK is applied to create a monorail vehicle dynamics simulation model.(3)Carry out dynamic performance analysis of a simple-supported beam monorail vehicle with differential structure.The research proposes the dynamic performance evaluation index of the simple-supported beam monorail vehicle with differential speed,and analyzes the performance,running stability and vehicle failure of the simple-supported beam monorail vehicle with differential structure,which is the actuality of the monorail vehicle.Use to lay the foundation.(4)Carry out optimization research on dynamic parameters of simply supported beam monorail vehicles with differential structure.Sensitivity analysis is carried out on the kinetic parameters affecting the passability of the vehicle curve,and the main factors affecting the passability of the curve are selected.Then,the steering torque of the bogie and the biasing force of the running wheel are taken as the target,and the vehicle overturning coefficient and the maximum guiding wheel guiding force are Constraint conditions,using multi-objective optimization software and multi-body dynamics software co-simulation method,optimize the kinetic parameters with significant influence,and obtain better kinetic parameters.The analysis results show that the optimized lateral wheel bias and the steering torque of the steering wheel are reduced,and the vehicle curve passing performance is improved.