Abstract: In order to improve the stability of the single-axle monorail vehicle, the structure of the single-axle bogie straddle monorail vehicle with spatial linkage structure was analyzed, and the nonlinear dynamics model of the single-axle monorail vehicle with the spatial linkage structure was established. The sensitivity analysis of the positioning parameters and suspension parameters of the spatial linkage structure of the monorail vehicle to the stability of the single-axle monorail vehicle was carried out by use of the global sensitivity method. Taking the side rolling angle and wheel load reduction rate of the single-axle monorail vehicle body as the target and taking the vehicle curve passing ability as the constraint, the optimization research was conducted on the positioning parameters of the spatial linkage structure and system suspension parameters of a single-axle bogie, which was based on the improved genetic algorithm (NSGA-II). The optimization results show that after the parameter optimization, the side rolling angle of the monorail vehicle body is reduced by 6.695%, and the wheel load reduction rate is reduced by 9.262%, which improves the operation stability of the single-axle monorail vehicle.

Key words: vehicle engineering; single-axle monorail vehicle; operation stability; side rolling angle; wheel load reduction rate; improved genetic algorithm

摘要： 为提高单轴式单轨车辆的稳定性能，分析了带空间杆系结构的单轴式转向架跨座式单轨车辆结构，建立了带空间杆系结构的单轴式单轨车辆非线性动力学模型。利用全局灵敏度方法，开展了单轨车辆空间杆系结构定位参数、悬挂参数对单轴式单轨车辆稳定性能灵敏度分析。以单轴式单轨车辆车体侧滚角和轮重减载率为目标，以车辆曲线通过性为约束，基于改进型遗传算法（NSGA-II）对单轴式转向架空间杆系结构定位参数及系统悬挂参数开展优化研究。优化结果显示：参数优化后，单轨车辆车体侧滚角减少了6.695%，轮重减载率减少了9.262%，提升了单轴式单轨车辆的运行稳定性。

关键词: 车辆工程；单轴式单轨车辆；运行稳定性；侧滚角；减载率；改进型遗传算法