摘要
为保证虚拟装配操作的精度和效率,提出了一种准确高效的用户装配意图捕捉算法。给出了虚拟装配环境中约束模型的表达和建模方法,引入约束元素包围盒的概念,并提出了其构造原则及方法。将约束元素包围盒的相交测试作为装配意图捕捉算法的入口,根据约束元素和自由度之间的映射关系,提出了约束多层识别算法来判断约束元素之间的装配约束类型,并通过设置约束元素优先级和利用约束元素间的进给增量比较策略来实现约束的智能确认。最后,使用时间花费代价函数表征装配意图捕捉算法的计算效率。通过某航天产品中的装配实例验证了所提算法的有效性。
To ensure the precision and efficiency of virtual assembly operations,a novel assembly intention capturing algorithm was proposed.The expression of constraint model and modeling method in virtual assembly environment were presented.The concept of Constraint Element Bounding Box（CEBB）was introduced and its construction rules and method were also put forward.Intersection test between two CEBB was used as the portal of assembly intention capturing algorithm.Constraints multi-layer recognition rules were presented to define the constraint type based on the mapping relationship between constraint elements and degree of freedom.Then,to realize the intelligent constraint confirmation,constraint priority and comparison strategy of motion increment between constraint elements were proposed.The time cost function was introduced to estimate the computation efficiency of the algorithm.Finally,effectiveness of the proposed method was verified by an application example in an aerospace product.
出处
《计算机集成制造系统》
EI
CSCD
北大核心
2010年第6期1208-1214,共7页
Computer Integrated Manufacturing Systems
基金
国防"十一五"预研资助项目~~
关键词
虚拟现实
装配
约束建模
约束元素包围盒
装配意图捕捉
约束确认
virtual reality
assembly
constraint modeling
constraint element bounding box
assembly intention capturing
constraint confirmation
