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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part K, Journal of Multi-body Dynamics >Effect of the tank car thickness on the nonlinear dynamics of railroad vehicles
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Effect of the tank car thickness on the nonlinear dynamics of railroad vehicles

机译：罐车厚度对铁路车辆非线性动力学的影响

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摘要

The expression of the centrifugal forces resulting from a flexible body negotiating a curve differs significantly from the expression of the centrifugal forces used in rigid body dynamics. In rigid body railroad vehicle dynamics, the balance speed does not depend on the body inertia; it depends on the vehicle speed, super elevation, track gauge, and gravity constant. This is not, however, the case when the structural flexibility is considered. In this paper, a general multibody system (MBS) approach that accounts for the nonlinear dynamic coupling between the wheel-rail contact forces and the tank car structural flexibility is used to examine the effect of increasing the tank car thickness on the nonlinear dynamics of railroad vehicles. The flexible tank cars are modelled in this investigation using the nonlinear finite element (FE) floating frame of reference (FFR) formulation. The tank car FE model is integrated with a computational railroad vehicle algorithm in which a three-dimensional elastic contact formulation is used to describe the rail-wheel interaction in order to allow for wheel-rail separations. A complete expression for the centrifugal and Coriolis forces is used with triangular shell finite elements to develop the tank car models with different thicknesses. The effect of the coupling between different modes of displacements is examined by comparing the results of the simulations of the flexible and rigid tank car models. A parametric study is performed in order to explain the effect of the thickness increase on the tank car natural frequencies. Furthermore, the effect of increasing the tank car thickness on the critical speed as well as on the nonlinear dynamics of the railroad vehicle during curve negotiation is examined. The FE/FFR formulation allows for accurately capturing the effect of the change of the tank car thickness on the centrifugal and Coriolis inertia forces that define the balance speed during curve negotiations. The analysis presented in this paper shows that there is a strong dynamic coupling between different modes of displacements of the tank car, the plate thickness, and the wheel-rail contact parameters. The effect of increasing the tank car thickness on the wheel wear is also examined in this paper.
机译：挠性物体通过弯曲而产生的离心力的表达与刚体动力学中使用的离心力的表达有很大不同。在刚体铁路车辆动力学中，平衡速度不依赖于惯性。它取决于车速，超高，轨距和重力常数。但是，考虑到结构灵活性时，情况并非如此。在本文中，一种通用的多体系统（MBS）方法解决了轮轨接触力与罐车结构柔性之间的非线性动态耦合，用于研究增加罐车厚度对铁路非线性动力学的影响汽车。在此研究中，使用非线性有限元（FE）浮动参考框架（FFR）公式对柔性罐车进行建模。油罐车有限元模型与计算铁路车辆算法集成在一起，在该算法中，使用三维弹性接触公式描述了车轮与车轮之间的相互作用，从而实现了轮轨分离。离心力和科里奥利力的完整表达式用于三角形壳体有限元，以开发具有不同厚度的油罐车模型。通过比较柔性和刚性油罐车模型的仿真结果，研究了不同排量模式之间耦合的影响。为了说明厚度增加对油罐车固有频率的影响，进行了参数研究。此外，研究了增加罐车厚度对临界速度以及曲线协商过程中铁路车辆非线性动力学的影响。 FE / FFR公式可精确捕获罐车厚度变化对离心力和科里奥利惯性力的影响，这些惯性力定义了曲线协商期间的平衡速度。本文进行的分析表明，油罐车的不同位移模式，板厚和轮轨接触参数之间存在很强的动力耦合。本文还研究了增加油罐车厚度对车轮磨损的影响。

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