| In order to achieve the green and sustainable development of rail transit,solve traffic congestion and reduce construction costs,a small-capacity suspended PRT(Personal Rapid Transit)system has emerged as the times require.The suspended PRT system is characterized by convenience,cleanliness,speed,economy,and comfort,which can be widely used in urban rail transit branch lines and scenic tourist attractions.Up to now,the research on suspended PRT vehicles is still in its infancy.The bogie,as an important component of the vehicle,is the key core of the development of suspension PRT vehicles.Therefore,it is necessary to conduct research on the structural scheme and dynamic performance of the bogie.In this thesis,a kind of suspended PRT vehicle has been developed,and the bogie structural design,dynamic analysis,and optimization have been carried out.The specific research results are as follows.1.A type of suspended PRT vehicle bogie scheme is proposed and its running mechanism is analyzed.The structural characteristics of the suspended PRT bogie are summarized,and the overall design base on the four-link mechanism is determined.Combined with the dimensions of the track beam and vehicle design requirements,it is clarified that the overall bogie consists of front and rear running system,bogie frame,central suspension system,drive transmission system,and foundation brake system.Then the running mechanism and force transmission route are analyzed.The maximum power and the maximum torque of the traction motor and the transmission ratio of the drive transmission system is determined,while the condition of vehicle non-skidding on the gradient is determined.2.The spatially coupled dynamics model for suspended PRT vehicles is established.Based on the design scheme of suspended PRT bogies,according to the operation mechanism and force transmission route of the vehicle,the degrees of freedom of the vehicle is analyzed,and the topological configuration of the vehicle is described.The spatially coupled dynamics model for suspended PRT vehicles is established on this basis,the differential equations of the vehicle dynamics are derived by using Newton’s method,and the dynamics simulation analysis model of the vehicle is established by ADAMS.3.The evaluation index of suspended PRT vehicle dynamics performance is proposed and the vehicle dynamics analysis is carry out.Referring to GB/T 5599-2019 and the evaluation methods for monorail vehicles at home and abroad,the evaluation index of suspended PRT vehicle dynamics performance is proposed.Then the simulation analysis and evaluation of running stability,running smoothness,and curve negotiation performance of suspended PRT vehicles are conducted based on the dynamics model of suspended PRT vehicles.4.Sensitivity analysis and multi-objective optimization study of suspension parameters of suspended PRT vehicles were carried out.The sensitivity analysis of vehicle suspension parameters is conducted based on the standardized regression coefficient method.Using ADAMS and mode FRONTIER to implement co-stimulation,multi-objective optimization was carried out using the second generation non dominated sorting genetic algorithm with the vehicle unbalanced centrifugal acceleration,lateral vibration acceleration and rolling angular velocity as the optimization objectives,resulting in better suspension parameters and improved vehicle running stability and running stability indicators.Through research,the bogie design scheme of suspensed PRT is determined,the dynamic performance of suspensed PRT is analyzed and evaluated,and suspension parameters are optimized,which provides a new idea for the conceptual design of suspensed PRT bogies and provides a useful reference for the dynamics analysis of vehicle suspension parameters. |
PDF Full Text Request