Abstract
Suspension-type small rail personal rapid transit systems are widely concerned due to their high efficiency and reliability. The increasing demands for ride comfort have put forward higher requirements for vehicle stationarity. In the study, with a single-bogie vehicle as the research object, a dynamic equation and a simulation model are firstly established to calculate the attitude angle and lateral velocity of the vehicle. Then, with the small amplitude and fast attenuation of the attitude angle and lateral velocity in a straight line and a bend as optimization objectives, the simulation model is optimized in terms of a series of variables, including the bogie with or without the supporting wheel, the supporting wheel tread, the driving wheel tread, the guide wheel tread, and the changes of the center of mass of the vehicle. Then, the problem of severe vehicle pitch with the double-bogie structure is solved. Finally, the simulation results and the optimization scheme are experimentally verified. The above optimization measures can significantly improve the driving stationarity of suspension-type small rail vehicles and enhance ride comfort.
Highlights
Traffic congestion is a problem that currently plagues urban development [1]
A novel suspension-type small rail system combining the advantages of rail vehicles and automobiles was studied. rough the theoretical analysis, multibody dynamics simulation, and experiments, the driving attitude and oscillation characteristics of the vehicle were studied in order to improve the driving stationarity and ride comfort of the vehicle
With the small amplitude and fast attenuation of the attitude angle and lateral velocity during straight driving and bend driving as the optimization objectives, key design parameters are optimized, including the introduction of the supporting wheel, supporting wheel tread, driving wheel tread, guide wheel tread, and center of mass. e supporting wheel has a great influence on the driving attitude of the vehicle, and the introduction of the supporting wheel in the structure can effectively suppress vehicle swing. e change of carriage’s center of mass has a great influence on the driving stationarity of the vehicle. e closer the center of mass is to the track surface, the more stable the vehicle driving is
Summary
Traffic congestion is a problem that currently plagues urban development [1]. In order to meet the travel demand of the modern society and improve the convenience and comfort of transportation, personal rapid transit (PRT) has been proposed [2, 3]. Gao et al established a coupled vehicle-bridge model of the straddle-type monorail based on multibody dynamics and the finite element method and studied the influences of vehicle speed, pier height, track irregularity, and vehicle load on ride comfort [15]. In this paper, based on two evaluation indicators of vehicles (the attitude angle and lateral velocity), a 3-DOF theoretical model considering the roll of carriage is established with the Lagrange method, and the dynamic equation of a single-bogie suspension-type small rail vehicle is derived. The driving system uses rubber tires with the cushioning effect. erefore, the influence of the track on the vehicle in the vertical direction can be ignored. e natural frequencies of the system are given in Table 1. e stiffness values of driving wheels, guide wheels, and supporting
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