发动机缸盖气道外壁构建

Construction of Cylinder Head Air Intake Port Ektexine of Engine

基于NURBS理论对发动机缸盖气道外壁进行构建,截取原气道截面线并偏移截面线,抓取偏移截面线节点建立B样条曲线,选取四条边界B样条曲线并定义内部控制曲线生成外壁曲面,合并外壁曲面实体化生成外壁实体。

An engine cylinder head air flue ektexine was constructed based on NURBS theory, which intereepted section line of the previous air flue and skewed the section line, and B-spline curve was built by snatching at pitch-point of the skewing seetion line. 4 boundaries Bspline curve was chosen, internal control curves were defined to form ektexine crowed surface, and then ektexine curved surfaces were combined in instantiation to form ektexine entity.