摘要
绝对节点坐标法是柔性多体系统中的一个重要建模方法,柔性体的碰撞技术在多体动力学仿真中有着重要的应用。该文建立了对绝对节点坐标的梁、板单元的几何体划分方法,利用检测几何体之间的碰撞信息,基于Hertz接触碰撞理论,给出了碰撞力计算表达式。在自主开发的多体动力学求解程序中嵌入碰撞计算模块,从而实现了基于绝对节点坐标的柔性体与柔性体、柔性体与刚体之间的碰撞仿真。应用算例的计算结果表明:该碰撞技术能有效处理梁、板和刚体之间的相互碰撞问题,既能研究碰撞过程中梁/板的动力学响应,同时又能方便提取碰撞力等碰撞信息,因而进一步扩大了绝对节点坐标法在工程中的应用范围。
The absolute nodal coordinate formulation is an important modeling method for flexible multibody systems for predicting collisions of flexible bodies in multibody dynamics simulations.A meshing method was developed for an absolute nodal coordinate beam and a plate element.The impact force calculating using Hertz contact theory was found using contact information from the collision detection between geometries.A collision calculation module was embedded in a multibody dynamics solver to predict contact between the flexible bodies or a flexible body and a rigid body.The simulations show that the meshing method and collision force calculations accurately model the beam and plate dynamic responses and the impact forces in beam,plate and rigid body collisions;thus,further expanding the absolute nodal coordinate formulation for engineering applications.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第7期1135-1140,共6页
Journal of Tsinghua University(Science and Technology)
关键词
多体动力学
绝对节点坐标
碰撞
multibody dynamics
absolute nodal coordinate
contact
