Influence of Preload and Nonlinearity of Railpads on Vibration of Railway Tracks under Stationary and Moving Harmonic Loads
Influence of Preload and Nonlinearity of Railpads on Vibration of Railway Tracks under Stationary and Moving Harmonic Loads
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DOI：
10.1260/0263-0923.34.3.289
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发表时间：
2015-06-01
影响因子：
2.3
通讯作者：
Owen, John S.
中科院分区：
文献类型：
--
作者：
Koroma, Samuel G.;Hussein, Mohammed F. M.;Owen, John S.
在铁路轨道动力学中，钢轨垫板的刚度和阻尼特性对轨道振动、衰减率以及传递到轨道支承结构的力有着重要的影响。许多研究表明，铁轨垫板表现出明显的非线性行为，具有预载和频率依赖性。本文提出了一种三参数钢轨垫板模型，给出了运动微分方程和由实验数据得到的模型参数。一个时域模型的轨道离散支持在这些铁轨垫板，然后制定使用有限元方法。该模型进行静态和动态加载，以研究预紧力和频率对其动态行为的影响。结果显示为时间历程和频谱的轨道位移和反作用力的各种预载水平。他们强调，在本研究中使用的参数的线性和非线性的情况下，观察到的大的差异（高达20 dB）的基础上，占非线性行为的必要性。
In railway track dynamics, the stiffness and damping properties of railpads have a significant effect on track vibration, decay rates as well forces transmitted to the track supporting structure. Many studies have shown that railpads exhibit pronounced nonlinear behaviour, with preload and frequency dependent properties. This paper presents a three parameter railpad model, together with its differential equation of motion and the required model parameters obtained from experimental data. A time domain model of a rail discretely supported on these railpads is then formulated using the finite element method. The model is subjected to static and dynamic loading in order to study the effects of preload and frequency on its dynamic behaviour. Results are shown as time histories and frequency spectra for the track displacements and reaction forces for various preload levels. They emphasise the necessity of accounting for nonlinear behaviour based on the large disparities (up to 20 dB) observed between the linear and nonlinear cases for the parameters used in this study.