摘要
视横风和轨道随机不平顺激扰下的车辆-轨道系统为随机非线性系统。依据车辆-轨道耦合动力学和随机分析理论,建立了用于横风、轨道随机不平顺联合分析的车辆-轨道系统随机分析模型。其中,横风由平均风和随机脉动风构成,考虑脉动风的空间相关性,采用谐波合成法模拟脉动风速,用Karhunen-Loève展开法把握脉动风的随机特征;采用轨道不平顺概率模型,生成轨道随机不平顺样本序列;通过将横风和轨道不平顺转化为相应的车辆-轨道系统荷载矢量,从而建立用于风-轨道不平顺联合分析的车辆-轨道随机分析模型。计算结果表明:横风对车辆、轨道系统的动力影响均十分显著。在本文给出的计算条件下,当横风标准风速达到15 m/s以上时,会逐步影响车辆的平稳舒适性,而当风速达到25m/s以上,行车安全受到严重威胁;此模型能够用于风环境下的车辆-轨道系统随机分析及可靠度计算。
The vehicle-track coupled system is regarded as a stochastic nonlinear system when the excitations of cross-winds and track random irregularities are taken into consideration.Based on the theories of vehicle-track coupling dynamics and random a-nalysis,this study develops a vehicle-track stochastic analysis model to analyze jointly the dynamic influence of cross-winds and track random irregularities.In this model,the cross-winds consist of the average wind and fluctuating winds.The fluctuating winds are simulated using the modified spectral representation method with consideration of the spatial correlation of the fluctu-ating winds.The Karhunen-Loève expansion method is applied to grasp the random features of fluctuating winds and the track random irregularities are generated by application of the track irregularity probabilistic model.On the basis of vehicle-track coupling dynamics,the cross-winds and track irregularities are correspondingly transformed into the dynamic loads of vehicle-track systems,and accordingly,the vehicle-track dynamic simulation model used for joint analysis of cross-winds and track ir-regularities is modeled.The computation results show that the cross-winds have significant influence on both the vehicle sys-tems and the track systems.The stability and comfort of the vehicle will be significantly affected when the standard velocity of the cross-wind reaches15m/s,and the security of the vehicle will be damaged if the speed of the winds is over25m/s.The model developed in this paper can be applied to the stochastic analysis and reliability evaluation of vehicle-track systems.
作者
徐磊
翟婉明
XU Lei;ZHAI Wan-ming(State-key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)
出处
《振动工程学报》
EI
CSCD
北大核心
2018年第1期39-48,共10页
Journal of Vibration Engineering
基金
国家重点基础研究发展计划(973计划)课题(2013CB036205
2013CB036206)
轨道交通工程动力学创新引智基地(B16041)
国家自然科学基金资助项目(51478482
51678507)
关键词
车辆--轨道耦合系统
随机分析
横风
轨道不平顺
vehicle-track coupled systems
random analysis
cross-winds
track irregularities
