Non-linear parametric modelling of a high-speed rail hydraulic yaw damper with series clearance and stiffness
Non-linear parametric modelling of a high-speed rail hydraulic yaw damper with series clearance and stiffness
复制标题
DOI：
10.1007/s11071-010-9871-7
复制
发表时间：
2011-07-01
影响因子：
5.6
通讯作者：
Xu, G. X.
中科院分区：
文献类型：
--
作者：
Wang, W. L.;Huang, Y.;Xu, G. X.
在高运行速度下，列车系统对部件的参数变化变得非常敏感。因此，在车辆动力学研究中纳入更精确的部件模型是至关重要的。本研究针对高速铁路液压抗蛇行减振器提出了一个更精细、更全面的非线性参数模型。提出了一种液压抗蛇行减振器模型的新概念，其中考虑了小安装间隙、串联刚度和粘性阻尼。串联刚度是动态油液刚度、橡胶连接刚度和安装座刚度共同作用的结果。建立了动态油液特性模型，并将其与整个建模过程相结合，其中油液的密度、动态粘度、体积弹性模量和刚度都根据瞬时工作压力、油温以及油液中的含气率而变化。还考虑了动态流量损失和阀系动力学。实验验证了所建立的非线性参数模型在极宽的速度范围内预测阻尼特性是准确且可靠的。经过验证的减振器模型随后成功地应用于实际服役条件下的全面参数敏感性分析和阻尼特性预测。所建立的减振器模型综合考虑了在常速问题中未被考虑或考虑不充分的所有主要影响因素；因此，它对于进一步研究高速问题将更加准确和适用。
At high operational speeds, the train system becomes very sensitive to parameter variations of components. Therefore, it is imperative to incorporate more accurate component models in the vehicle dynamics studies. This study addresses a more subtle and comprehensive non-linear parametric model of a high-speed rail hydraulic yaw damper. A new concept of a hydraulic yaw damper model is suggested, in which the small mounting clearance, the series stiffness, and the viscous damping are built in. The series stiffness is the tandem result of the dynamic oil stiffness, the rubber attachment stiffness, and the mounting seat stiffness. A dynamic oil property model is established and coupled to the entire modelling process, in which the density, the dynamic viscosity, the volumetric elastic modulus, and the stiffness of the oil are all changeable in terms of the instantaneous working pressure, the oil temperature, and the entrapped air ratio of the oil. The dynamic flow loss and the valve system dynamics are also incorporated. Experiments validated that the established non-linear parametric model is accurate and robust in predicting the damping characteristics within an extremely wide speed range. The validated damper model was then successfully applied to a thorough parameter sensitivity analysis and damping nature prediction under practical, in-service conditions. The established damper model couples all the main influential factors that are not or are insufficiently considered in normal-speed problems; thus, it will be more accurate and appropriate for furthering high-speed problem studies.