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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Prediction of dynamic stresses using flexible multibody system algorithms: Application to tracked vehicle upper structure
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Prediction of dynamic stresses using flexible multibody system algorithms: Application to tracked vehicle upper structure

机译：使用灵活的多体系统算法预测动态应力：在履带式车辆上部结构中的应用

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The objective of this investigation is to develop a general procedure for predicting the dynamic stresses when the nonlinear floating frame of reference formulation is used to model flexible components in multibody system applications. The procedure utilizes the concept of the floating frame of reference intermediate finite element coordinate system and the general continuum mechanics approach to develop accurate definitions of the floating frame of reference kinematic equations that enter into the formulations of the strains. These general equations are used to design a computational algorithm for the calculation of the dynamic stresses. In order to demonstrate the use of the procedure developed in this investigation for the stress prediction, a tracked vehicle system is used as the study model. Taking into consideration the actual endurance test, a model for a bulldozer upper structure is developed using computer aided engineering solution framework which includes flexible multibody system algorithms. In order to obtain the dynamic stresses, the flexible structure of the tracked vehicle is modeled using Mindlin shell finite elements. The equations of motion are developed using the finite element/floating frame of reference formulation that allows for effectively reducing the number of degrees of freedom by neglecting high-frequency modes of vibration using component mode synthesis techniques. The stresses are obtained using a procedure that takes into consideration the dynamic coupling between the rigid body motion and the elastic deformations. The use of the general continuum mechanics theory to formulate the strain and stress equations allows for applying the procedure developed in this paper to other element types. Kinematic relationships are used to formulate several components and elements of the undercarriage including the idler cushion system and the maximum reverse angle. Numerical results are presented in order to demonstrate the use of the general floating frame of reference procedure in the stress analysis of the tracked vehicle undercarriage system.
机译：这项研究的目的是开发一种通用方法，用于在参考配方的非线性浮动框架用于多体系统应用中的柔性组件建模时预测动态应力。该程序利用参考中间有限元坐标系的浮动框架的概念和通用的连续力学方法来开发参考运动学方程的浮动框架的精确定义，该定义进入了应变公式。这些通用方程式用于设计用于计算动态应力的计算算法。为了证明将本研究中开发的程序用于应力预测，将履带车辆系统用作研究模型。考虑到实际的耐久性测试，使用计算机辅助工程解决方案框架开发了推土机上部结构的模型，该框架包括灵活的多体系统算法。为了获得动态应力，使用Mindlin壳有限元对履带车辆的柔性结构进行建模。运动方程式是使用参考公式的有限元/浮动框架开发的，它通过使用分量模式合成技术忽略高频振动模式，可以有效地减少自由度的数量。使用考虑了刚体运动与弹性变形之间的动态耦合的过程来获得应力。使用通用连续力学理论来公式化应变和应力方程，可以将本文开发的程序应用于其他元素类型。运动学关系被用来制定起落架的几个组成部分和元素，包括惰垫系统和最大倒角。给出了数值结果，以证明参考程序的通用浮动框架在履带式车辆底盘系统的应力分析中的使用。

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