虚拟原型多体动力学约束模型研究

Constraint Models Systems for Virtual Prototype Multibody Dynamics

并行工程角度出发的机械虚拟原型是集成了产品的设计、分析,不断迭代、优化的过程,模型的协调一致性是保证设计过程完整的关键,如产品模型在CAD模型与机械多体动力学模型中的一致性表达。在这种观点下,该文提出在建立基于组件的机械系统虚拟原型时,从CAD中抽取多体动力学模型构件的物理属性,研究了国产三维实体设计软件CAXA环境下,基于多刚体系统动力学笛卡尔方法,从CAD模型映射多刚体动力学分析模型语义的实现方案。分析了多刚体系统动力学模型语义下,多体动力学约束模型坐标基变换关系的抽取。实验结果表明,从CAD中抽取多体动力学模型的物理属性的方案是可行的,可以用于建立基于组件的多体系统虚拟原型的分析模型,实现自主开发设计、分析集成的机械虚拟原型。

Mechanical virtual prototype in concurrent engineering is an iterated and optimized process, in which product design and analysis are integrated. The paper proposes to extract physical properties on multibody dynamics from CAD when constructing mechanical virtual prototype based on component. The scheme of mapping semantic between CAD model and analysis model of multibody dynamics is realized based on Cartesian method of multibody dynamics in CAXA of 3 - dimensional CAD. It analyzes how to extract coordination eonversion of multibody dynamies constraint model in semantic of muhibody dynamics model. It is proved that extracting physics properties on multibody dynamics from CAD is realizable. It can be used to eonstruet the analysis model of multibody dynamics based on component and realize the development of mechanical virtual prototype.