Objective In the complex service environments of mountainous cities, the pantograph-catenary relationship of straddle monorail vehicles is difficult to coordinate and control, and the pantograph-catenary contact quality is poor, leading to serious wear of pantograph sliders. To reduce the wear of pantograph sliders, the pantograph-catenary contact quality of straddle monorail vehicles under such environments must be optimized based on tire dynamic parameters.

Method To better simulate the pantograph-catenary coupling state of straddle monorail under complex service conditions, a coupled vehicle-pantograph-catenary dynamics simulation analysis model of straddle monorail vehicles for large-superelevation and small-radius curved sections is established based on the track beams irregularity test data, considering spatial 3D excitation and settlement of track beams. The influence degree of vehicle tire dynamic parameters on the pantograph-catenary contact force is analyzed using the sensitivity analysis method. Taking the pantograph-catenary contact force and bogie lateral acceleration as optimization objectives, the vehicle tire dynamic parameters are optimized via NSGA-II (non-dominated sorting genetic algorithm) through a multi-objective collaborative optimization method.

Result & Conclusion Optimizing tire dynamic parameters can effectively improve pantograph operational performance. After optimization, the standard deviation of pantograph-catenary contact force deceases by 8.76%, and for the bogie lateral acceleration, mean value drops and the standard deviation decreases by 16.42%.