The finite element model of the running tyre and the pre-stressed concrete (PC) track beam are created in the study. The wheel-rail contact status under the conditions such as acceleration or braking, lateral deviation, and roll is...

A nonlinear dynamic model of monorail vehicle and a finite element model of “running wheel-rail beam” system is established respectively, which is integrated into the Modefrontier platform. The total friction work and friction work deviation value are proposed as indicators for evaluating the wear and partial wear of the running wheels. Taking the total friction work and friction work deviation as the goals, the stability and curve passing performance of the monorail vehicle as constraints, and the structural parameters and dynamic parameters of the monorail vehicle as the optimization variables, an optimization model of partial wear of running wheel was established. The structural parameters and dynamic parameters of monorail vehicle are optimized through improved genetic algorithm. The analysis results show that the two indicators of the total friction work and friction work deviation value of the running wheels both decreased. Among them, the total friction work of the front right and rear right running wheel with severe partial wear was reduced by 20% and 21.2% respectively, the friction work deviation value was reduced by 19.30% and 27.2% respectively. The partial wear of the running wheel is improved significantly, and the purpose of reducing the partial wear of the running wheel is achieved.

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.

In order to solve the problem of excessive tire wear during the running of straddle monorail vehicle, an innovative wide-base spine type bogie was proposed. In order to verify the effect of wide wheel base bogies on reducing the wear of running tires, the mutual restriction between horizontal wheels was considered when the finite element model of the running wheels of straddle monorail vehicles with wide wheel base was established. The modified attenuation exponential friction model is used to simulate wheel-rail contact characteristics, and the polynomial is used to simulate the constitutive relationship of running tires. Based on Archard model, a quantitative wear depth model of running tires was established to analyze the wear characteristics of running tires of wide wheel base bogies under typical working conditions. The results show that the tread wear of the wide wheel gauge monorail vehicle under steady condition is symmetrical. Under pure lateral and roll conditions, the tire surface exhibits uneven wear patterns. Under daily operating conditions, the wear of the outside running tire of the wide wheel base monorail vehicle is higher than that of the inside running tire. Compared with existing straddle monorail vehicles, the maximum wear depth of running tires of wide wheel base monorail vehicles is reduced by 30.4%, 29.8%, 25.8%, and 21.3%, and the degree of partial wear is reduced by 34.4%, 39.2%, 30.1%, and 31.4%. Compared with existing straddle monorail vehicles, the wear resistance of the running tires of wide-gauge monorail vehicles has been significantly improved.

Material interface delamination exists in the running tires of straddle-type monorail vehicles during operation. To effectively enhance the safety and service life of Running Tires while reducing maintenance costs, this study establishes a finite element model of the straddle-type monorail vehicle Running Tire. Through stress and strain analysis under three working conditions (steady-state rolling, sideslip, and camber), combined with the Lake-Lindley model and maximum tearing energy method for fatigue parameter fitting, the fatigue life of Running Tires under multi-condition operation was simulated using Fe-safe software. The research findings indicate that the tread grooves and steel belt ends are high-risk areas under steady rolling conditions, with increased load significantly shortening lifespan. Fatigue damage occurs at the carcass rubber turnover points under sideslip conditions, and at the tread camber ends and apex rubber areas under camber conditions. With Running Tire fatigue life as the optimization target and steel belt angle as the design variable, parameter optimization of Running Tire steel belt angles was conducted using response surface methodology and genetic immune algorithm. The results demonstrate that optimized steel belt angles improve Running Tire fatigue life by 11.68%. This research provides theoretical foundations and methodological support for structural optimization design of straddle-type monorail vehicle Running Tires.