直升机概念设计中的部件参数化

为了满足直升机概念设计阶段对方案快速建模的要求,在面向对象技术的基础上提出了直升机概念设计阶段部件的建模分类方法,并且建立了一个计算机辅助直升机概念设计系统.应用非均匀有理B样条NURBS(Non-Uniform Rational B-Spline)曲面和基于特征的部件造型技术,实现了各种型式直升机方案的参数化建模.其中结合设计参数提出了旋翼的桨叶、桨尖、桨毂以及整流罩的描述参数,并对涵道尾桨进行了分段造型处理.最后给出了该系统中生成的两个设计方案作为实例以验证所提出方法的便捷性和有效性,这些方法也为进行设计方案的性能分析和优化等后续工作奠定了基础. 

Components parameterization in helicopter conceptual design

To satisfy the requirement of rapid modeling in helicopter conceptual design,a method was brought forward for classifying helicopter components on the basis of object-oriented technique,and a computer aided helicopter conceptual design system was developed.By applying NURBS(non-uniform rational B-spline) surfaces and feature-based components modeling technique,parametric modeling of helicopter concepts belonging to different types was realized.In particular,by taking the design parameters into account,the patameters describing rotor blade,blade tip,rotor hub and fairing were proposed,and ducted tail rotor was modeled by breaking it into several continual segments.Two design concepts generated with this system were finally presented as examples to validate the convenience and effectiveness of the proposed methods,which formed the bases for such further work as concept performance analysis and optimization.