一种飞机大尺寸曲面测量点差异性规划方法  

A difference measurement points planning method for large-scale surface of aircraft

作　　者：毛喆 李泷杲[1] 徐岩[1] 曾琪[1] 主逵 MAO Zhe;LI Shuanggao;XU Yan;ZENG Qi;ZHU Kui(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Shenzhen JT Automation Equipment Co.Ltd.,Shenzhen 518101,China)

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]深圳市劲拓自动化设备股份有限公司,深圳518101

出　　处：《北京航空航天大学学报》2020年第5期1024-1031,共8页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家重点研发计划(2017YFF0107304)。

摘　　要：数字化测量技术在飞机大尺寸零部件检测的应用日益广泛,合理规划测量点数量和分布以精确地描述待测特征已成为关键问题之一。针对复杂曲线曲面的测量点规划问题,提出了一种基于确定性表达的测量点差异性规划方法。利用非均匀有理B样条(NURBS)理论精确拟合自由曲线,通过粒子群优化算法综合优化控制点及权因子,构建高精度的拟合曲线。提出了面向曲率特性和测量不确定度的布点策略,结合曲面特性建立完整、高效的测量点规划流程。基于CAA模块程序化实现了测量点规划方法,并以试验件为验证对象,验证了所提方法的可行性和系统的有效性。Digital measurement technology has been gradually applied in aircraft large-scale component measurement,which also brings about many issues,and the fundamental one is how to plan the number and layout of measurement points to well describe the curve or surface.Aimed at solving the issue of complicated curve or surface measurement points planning,a novel difference measurement points planning method based on deterministic representation is proposed.The curve’s deterministic representation is acquired by using Non-Uniform Rational B-Splines(NURBS)theory,and the particle swarm optimization is adopted to optimize the control points and corresponding weights factors to construct the high-precision fitting curve.Two different measurement point planning strategies considering curvature and measurement uncertainty are designed,and combined with surface characteristics,a complete and high efficiency measurement point planning process is constructed.The measurement points planning algorithm proposed in this paper is programmed based on the CAA,and by taking test piece as experiment object,the feasibility of the algorithm and the effectiveness of the system are verified.

关 键 词：数字化测量 测量点规划 曲线参数化 测量不确定度 曲率极值点 

分 类 号：V241.05[航空宇航科学与技术—飞行器设计] TP391[自动化与计算机技术—计算机应用技术]