Abstract
The research on vibration response on random pavement is conducted to evaluate the riding stability and comfort of a new straddle-type monorail vehicle with single-axle bogies. The topology of straddle-type monorail vehicles with single-axle bogie is analyzed, and the full-scale dynamic model of single-axle bogie straddle-type rail transit vehicles of 34 degree of freedom and the tire-track beam contact model are established. Based on the dynamic model, the random vibration influence characteristics of vehicles of different velocities and tire stiffness are analyzed. Based on the research the riding stability and comfort are reduced with the increase in velocities and tire stiffness. The vertical stability is lower than the horizontal one with the vehicle with the same velocity and mass. This is because that the vertical vibration has a larger amplitude ratio than that of the horizontal vibration. No change is caused on frequency phase with the changes on stiffness. But certain change is made on amplitude. The frequency response is reduced with the increase in stiffness, leading to better stability and riding comfort. DOI: http://dx.doi.org/10.5755/j01.mech.25.1.21931
Highlights
With the development of cities, the problem of heavy traffic is increasingly obvious in big cities
The straddle-type monorail system has a large number of advantages such as small radius of turning circles and grade ability, light axle beams, low fabrication cost and low noises due to rubber tires so that it has been an urban rail transit research clique with middle and low traffic volume widely applied [1].The straddle-type monorail vehicles can be divided into two vehicle models, i.e., the “double-axle type model” and the “single-axle type model”, represented by China Changchun Railway Vehicles, Hitachi and Bombardier, Scomi, respectively
The single-axle bogie is composed by the framework, the running tire, the air suspension, the vertical and lateral damper
Summary
With the development of cities, the problem of heavy traffic is increasingly obvious in big cities. A mathematical model of a straddle type monorail vehicle has been developed in order to study its stability and the effect of tire modelling techniques on its dynamic response [15]. From the dynamic of the straddle-type single-rail vehicles with single-axle bogies, the “tire-rail coupling” dynamic model is established employing multi-body dynamic in this article, to conduct vibration response on velocity and tire stiffness. The dynamic model for straddle-type vehicles with single-axle bogies of 34 degree of freedom is established, including mainly plunging motions, nodding motions, yawing motions, transverse motions and rolling motions. The motion equations of straddle-type vehicles with single-axle bogies is established, involving in plunging motions, nodding motions, yawing motions, transverse motions and rolling motions; 3.
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