基于组件的多体系统虚拟原型的分析模型研究

Research on Analysis Model Based on Multibody System Virtual Prototype Implemented by Component

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,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,万向节装配体的惯量张量、滑移铰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 iterated and optimized process, in which product design and analysis are integrated. It is a key of integration of design process that harmonizes model, for example, conversion between CAD model and mechanical multibody dynamics model. In the viewpoint, it was addressed that physics properties on multibody dynamics was extracted from CAD when mechanical virtual prototype was constructed based on component. It was studied that scheme of mapping semantic between CAD model and analysis model of multibody dynamics was realized based on Cartesian method of multibody dynamics in CAXA of 3-dimensional CAD. It was analyzed that how to extract inertia tensor of universal assembly and coordination conversion of Prismatic-Joint constraint model in semantic of multibody dynamics model. It is proved that extracting physics properties on multibody dynamics from CAD is realizable, by which analysis model of multibody dynamics based on component can be constructed. It is realizable that mechanical virtual prototype is developed by own, integrated in design and analysis.