摘要
为了解决涡轮叶片在其产品改型、气动优化、叶片修复等实际工程问题需要建立实物数字化模型的问题,采用截面特征技术与二维草图约束功能相结合应用于模型重构。针对涡轮叶片几何特征和气动设计要求,将涡轮叶片点云切片截面曲线分层表达为曲线元并分段进行差值拟合,基于二维草图约束技术对截面曲线进行几何特征约束,构造出满足约束条件与数据点逼近的最优曲线并放样生成曲面。结果表明,基于截面特征的反求工程技术与二维草图曲线约束优化技术相结合,可以快速、准确构造出复杂曲面,提高了逆向建模的效率,为快速重构模型提供了一种方法。
To solve the problem of establishing digital model of turbine blade for product modifications, aerodynamic optimization, blade repairing and other practical engineering, the technology of constraint on sectional feature and 2D sketch are applied to reconstruct curved surface model. For turbine blade geometry and aerodynamic design requirements, turbine blade section curve point cloud slices are layered to express as the difference curves and fitted in stages. Based on constraint technology about curve geometry features of 2D sketch, the curved surface that meets the constraint and approaching the data point is constructed. The result shows that the reverse engineering technology based on the cross section feature constraints technique and forward design technique can quickly and accurately construct complex surface and improve the efficiency of reverse modeling and provide a method for rapid reconstruction model.
出处
《机械强度》
CAS
CSCD
北大核心
2014年第4期578-582,共5页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51379179)
西华大学研究生创新基金(ycjj2014176)资助
流体及动力机械教育部重点实验室项目(SBZDPY-11-7)~~
关键词
涡轮叶片
截面特征
逆向工
程特征约束
曲面重构
Turbine blades
Section feature
Reverse engineering
Feature constraint
Surface reconstruction
