Optimization research on arc height of running surface based on reducing partial wear of straddle-type monorail vehicle running wheel tire

Xiaoxia Wen,Liang Chen,Zixue Du

doi:10.1177/16878140211053418

Abstract

This article proposes an ideal of reducing the partial wear of the running wheels by optimizing the arc height of the running surface to improve the wheel-rail contact state. To realize this idea, two kinds of concave and convex running surfaces were designed, the “running wheel-rail beam” finite element model of three kinds of rail surfaces of concave, convex, and plane were established. Taking the arc height of the running surface as the design variable, the total friction work and the friction work deviation (FWD) value as the dual optimization goal, an optimization model of arc height of running surface was established based on finite element model and multidisciplinary optimization platform Modefrontier. An improved genetic algorithm was used and an co-simulation optimization mode was put forward in the optimization. The optimization results show that when the concave height of the inner running surface is 22.62 mm, the total friction work and the FWD values are reduced by 11% and 11.8% respectively; When the convex height of the outer running surface is 11.81 mm, the objection values are reduced by 4.9% and 32.1% respectively. An ideal running surface was obtained and the life of the running wheel was extended by the research.

Highlights

Straddle monorail is a new urban rail transit system with unique technology and tire-rail coupling drive, which is different from the subway with steel wheel and rail
Wen et al.,[14] the author of this paper considered the nonlinear characteristics of rubber tires and established a spatial coupling dynamic model of a straddle-type monorail vehicle (SMV), which include a three-directional wheel-rail contact pair between running wheel and top surface of rail beam, horizontal wheels, and the side surface of the rail beam
An optimization model of arc height of the running surface was established based on the finite element model and the multidisciplinary optimization platform Modefrontier to realize the active optimization of the arc height of running surface and greatly improve the optimization efficiency

Summary

Introduction

Straddle monorail is a new urban rail transit system with unique technology and tire-rail coupling drive, which is different from the subway with steel wheel and rail. It has broad application prospects in the public transportation branch lines of major cities and the public transportation trunk lines of medium-sized cities in China. During the operation of the straddle monorail line in Chongqing, China, it was found that the running wheels were severely partial worn and the tires were replaced frequently. Domestic and foreign scholars mainly conduct research from tire parameters, tire operating parameters, and road conditions.[1,2,3] The straddle-type monorail vehicle (SMV) has a special structure. At present, there is little research on the partial wear of running wheel tires at home and abroad

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Results

Conclusion