ANCF analysis of the crude oil sloshing in railroad vehicle systems
ANCF analysis of the crude oil sloshing in railroad vehicle systems
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DOI：
10.1016/j.jsv.2018.06.035
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发表时间：
2018-10
影响因子：
4.7
通讯作者：
E. Grossi;A. Shabana
中科院分区：
文献类型：
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作者：
E. Grossi;A. Shabana
随着原油轨道运输量的增加，对原油非牛顿流变性能及相应的非线性晃动效应进行精确建模是建立安全运行准则的必要条件。本文采用基于非线性连续体的原油本构模型，采用全拉格朗日公式，研究了晃动对轨道车辆动力学和稳定性的影响。特别地，Oldroyd本构模型被用来捕捉三种不同原油类型的非牛顿特性；分为轻型、中型和重型。采用有限元（FE）绝对节点坐标法（ANCF）捕获原油复杂变形形态。基于有限元连续体的液体晃动公式与允许轮轨分离的全非线性多体系统（MBS）轨道车辆算法系统集成。为了研究诸如舱壁等晃动抑制装置的影响，提出了一种通用的惩罚接触方法。考虑不同制动工况，包括电控气动制动（ECP），研究原油晃动对列车纵向稳定性的影响。ECP制动计算机模拟表明，与轻质油相比，增加原油粘度可以使最大耦合器力降低约30%。观察到，随着黏度的增加，ECP制动引起的晃动激励下的耦合器力响应更快地达到稳态。此外，在油罐车中安装舱壁可以减少70%的最大耦合器力，并使前后轮的法向接触力分布更均匀。分析了原油流变特性对曲线传递过程中离心力的影响。曲线协调结果表明，原油浓度的增加加剧了列车横向失稳效应，从而增加了车辆侧翻的风险，特别是当列车以高于平衡速度行驶时。
With the increase incrude oilrail transportation, accurate modelling of non-Newtonian crude oil rheological properties and the corresponding nonlinear sloshing effects becomes necessary in order to establish safety and operation guidelines. In this investigation, nonlinear continuum-based crude oil constitutive models are used in a total Lagrangian formulation to study the effect of the sloshing on railroad vehicle dynamics and stability. In particular, the Oldroyd constitutive model is employed to capture the non-Newtonian characteristics of three different crude oil types; classified aslight,medium, andheavy. The crude oil complex deformation shapes are captured using the finite element (FE) absolute nodal coordinate formulation (ANCF). The FE continuum-based liquid sloshing formulation is systematically integrated with a fully nonlinear multibody system (MBS) railroad vehicle algorithm that allows for wheel/rail separation. A general penalty contact approach is developed to allow for studying the effect of sloshing suppression devices such as bulkheads. Different braking scenarios, including electronically controlled pneumatic (ECP) braking are considered to study the effect of crude oil sloshing on the train longitudinal stability. The ECP braking computer simulations show that increasing the crude oil viscosity can lead to approximately 30% reduction in the maximum coupler force compared to the light oil case. It is observed that the coupler force response to the sloshing excitations as the result of ECP braking reaches steady state faster as the viscosity increases. Furthermore, installing the bulkheads in tank cars can lead to a 70% reduction in the maximum coupler force and more uniform distribution of the normal contact forces to the front and rear wheels. The effect of crude oil rheological properties on the centrifugal forces during curve negotiation is also evaluated. The curve negotiation results show that the increase in crude oil density is responsible for exacerbating train lateral instability effects, thus the risk of vehicle roll over, especially when the train travels at a speed higher than the balance speed.