单轨车辆耦合动力学模型与振动响应特性

为了研究单轨车辆在设计车速范围内的振动响应特性,进而评价单轨车辆运行平稳性与舒适性能,分析了单轨车辆走行轮、导向轮、稳定轮和转向架中央牵引装置及车体间的拓扑关系,利用Hamilton方程构建了包含走行轮与轨道梁顶部,导向轮、稳定轮与轨道梁侧部等三向轮轨接触对的单轨车辆空间耦合系统动力学模型,并对单轨的PC轨道梁走行面及轨道梁左、右两侧部轨面的不平度进行了数值模拟。基于空间耦合动力学模型,以轨道不平度为激励源,设定车辆以某一恒定速度在直线轨道上运行,获取了单轨车辆的振动响应特性,并与实车测试结果对比分析,验证了单轨空间耦合动力学模型的正确性。在此基础之上,获取了单轨车辆不同设计车速下的振动响应特性,对单轨车辆的运行平稳性和舒适性进行了评价。结果表明,单轨车辆的舒适性能优良,运行平稳性能处于优秀等级。

The Coupling Dynamic Model and Vibration Response of Straddle Type Monorail Vehicle

In order to investigate the vibration response characteristics and evaluate the stability and comfort of the straddle type monorail vehicle within the designed speed, the topology relationships among the traveling wheels, guide wheels, stabilizing wheels and bogie central traction devices are analyzed. A monorail vehicle spatial coupling dynamic model, which consists of three wheel-rail contact modes, is established based on Hamilton equation. The contacts to be studied are the one between the traveling wheel and the top surface of beam, and the contact of the side surface of the rail beam with the guide wheel and stabilizing wheel respectively. Several prominent characteristics such as the vibration dynamic responses of monorail lateral and vertical acceleration are obtained based on the coupling dynamic model when the roughness is designated to be the excitation source given the vechicle moving with a constant speed. Finally, the coupling dynamic model is validated with the comparison of the related experimental results. In this way, vibration response characteristics of monorail vehicle for different design speed are obtained under three rail surface roughness excitation. According to the simulated vibration results, the monorail vehicle stability and comfort performance through straight line is evaluated. The results infer that the monorail vehicle had outstanding comfort performance and excellent running stability.