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首页> 外文会议>ASME/IEEE/ASCE joint rail conference 2008 : Mechanical and civil engineering papers ; Electrical engineering papers >THREE-PIECE HALF-TRUCK MULTIBODY DYNAMICS MODELS FOR FREIGHT TRAIN SUSPENSIONS
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THREE-PIECE HALF-TRUCK MULTIBODY DYNAMICS MODELS FOR FREIGHT TRAIN SUSPENSIONS

机译：货车悬架的三件式半卡车多体动力学模型

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摘要

A three-piece bogie acts as a support for the freight train car bodies so that they can run on straight and curved tracks. It also absorbs the vibrational energy generated by the track. The three main parts of a traditional three-piece bogie are two side frames and a bolster. The side frames run parallel to the rails and are connected to each other by the bolster, which runs perpendicular to the rail. The side frames are connected to the axles, which are directly connected to the wheels that run on the track through the primary suspension.rnThe primary suspension includes the bearing adapter and pedestal roof. The secondary suspension, which includes the friction wedge and load coils, connects and provides damping on each end of the bolster at its intersection with the side frame. Moreover, the friction wedge aids in warp resistance of the bogie. Because of the wedge's non-linear frictional characteristics and load sensitive behavior, accurately capturing its dynamics in a computational model proves difficult.rnPrevious work at the Railway Technology Laboratory (RTL) at Virginia Tech focused on better capturing the dynamics of the friction wedge modeled as a 3D rigid body. The current study extends that work to a half-truck model treated as an application of multibody dynamics with unilateral contact to model the friction wedge interactions with the bolster and the side frame. The half-truck model created in MATLAB is a 3D, dynamic, stand-alone model comprised of four rigid bodies: a bolster, two friction wedges, and a side frame assembly. The model allows each wedge four degrees of freedom: vertical displacement, longitudinal displacementrn(between the bolster and side frame), pitch (rotation around the lateral axis), and yaw (rotation around the vertical axis). The bolster and the side frame have only a vertical translation degree of freedom. The geometry of these bodies can be adjusted for various simulation scenarios. The bolster can be initialized with a pre-defined static yaw (rotation around the vertical axis) and the side frame may be initialized with a predefined pitch/toe geometry (rotation around the lateral axis). The model simulation results have been compared with results from NUCARS~R, an industrially used train modeling software developed by the Transportation Technology Center, Inc., for similar inputs.
机译：三件式转向架可作为货车车厢的支撑件，使它们可以在直线和弯曲的轨道上行驶。它还吸收轨道产生的振动能量。传统的三件式转向架的三个主要部分是两个侧架和一个承梁。侧框架平行于导轨延伸，并通过垂直于导轨延伸的承梁相互连接。侧架连接至车轴，车轴直接连接至通过主悬架在轨道上运行的车轮。rn主悬架包括轴承适配器和基座顶盖。辅助悬架（包括摩擦楔形件和负载线圈）在其与侧框架的相交处连接并在其两端提供阻尼。此外，摩擦楔块有助于增加转向架的抗翘曲性。由于楔块的非线性摩擦特性和载荷敏感行为，在计算模型中准确地捕获其动力学被证明是困难的。弗吉尼亚理工大学铁路技术实验室（RTL）先前的工作集中在更好地捕获建模为3D刚体。当前的研究将该工作扩展到半卡车模型，该模型被视为具有单侧接触的多体动力学的应用，以模拟与支撑和侧架的摩擦楔形相互作用。在MATLAB中创建的半卡车模型是一个3D动态独立模型，由四个刚体组成：一个枕梁，两个摩擦楔块和一个侧框架组件。该模型允许每个楔形体有四个自由度：垂直位移，纵向位移rn（在枕梁和侧架之间），俯仰（绕侧轴旋转）和偏航（绕垂直轴旋转）。承梁和侧框架仅具有垂直平移自由度。这些实体的几何形状可以针对各种模拟场景进行调整。可以通过预定义的静态偏航（绕垂直轴旋转）初始化枕梁，并且可以使用预定义的俯仰/脚趾几何形状（绕横轴旋转）初始化侧梁。已将模型仿真结果与NUCARS〜R的结果进行了比较，NUCARS〜R是运输技术中心有限公司开发的用于类似输入的工业火车模型软件。

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