Design And Research Of Bogie For Suspended PRT System Vehicle

The personal rapid transit system is considered to be a new type of transportation method that can solve the problem of urban traffic congestion.The PRT system has been studied abroad for a long time and also there has been multiple successful applications.The vehicle is the core component of the PRT system.The PRT vehicles in the new era must confirm to the concept of smart cities and smart transportation.In addition,modern PRT system vehicles need to adapt to the complex environment of modern cities and confirm to the high demands of citizens on travel modes.As it is necessary to ensure that vehicles can freely shuttle on the elevated orbits above city streets.designing PRT systems that confirm to the requirements is particularly important.On the basis of fully researching the characteristics of the PRT system,combined with the requirements of the modern city on urban rail transit,this paper chooses to design a small suspended monorail vehicle as a PRT system vehicle.This paper focuses on the design of bogies for suspended monorail vehicles.The bogie is the running part of the entire vehicle and is the core component of the vehicle,including many components such as frame,drive unit,running wheels,guide wheels,stabilizer wheels,suspension devices and braking devices.The structure of the bogie is related to the running quality and the safety of the vehicle.The bogie frame is the mounting basis for the components of the bogie.During the operation of the vehicle,the bogie frame is subjected to complex alternating random loads.The strength and stiffness of the structure play a decisive role in the service life of the vehicle.In order to ensure the driving safety of the vehicle,it is necessary to carry out strength analysis,modal analysis and fatigue life analysis of the designed bogie frame.First of all,this paper designs the bogies of the suspended PRT system,including all parts connected to the bogie frame,such as the vehicle driving device,braking device,running wheels,guide wheels,stabilizer wheels,and suspension device,using CATIA software to build a three-dimensional assembly model of the vehicle.Then,using the bogie frame as the main research object,Hyper Mesh software was used to discretize the three-dimensional solid model,obtaining the finite element mesh model of the bogie frame.This paper then calculates the load that the frame receives during vehicle operation and determines the load conditions of the bogie frame.The ANSYS software was used to analyze the strength of the bogie frame by FEM.According to the strength evaluation standard,the strength of the bogie frame was verified to meet the design requirements.In order to obtain the natural frequency and corresponding mode shape of the bogie frame that is used to verify the rationality of the Structural design,the modal analysis of the bogie frame is also performed by using ANSYS software.Finally,on the basis of finite element strength analysis results,using ncode Designlife software to calculate the fatigue life of the bogie frame,which using the nominal stress method to find the weakest position of the fatigue life of the bogie frame,and to verify that the fatigue life of this point is much longer than the design life of the bogie frame.Therefore,the bogie frame designed in this paper can be determined to meet the design requirements.