摘要
为了精确检测飞机蒙皮表面的波纹度,提高检测效率,研究了一种改进的点到参数曲面投影算法,即使用椭圆环面片逼近蒙皮设计曲面的方法求解点到曲面的投影,采用该方法从曲面的测量点云中提取待测波纹度位置的测量点,并计算测量点与理论位置的偏差值。根据偏差值的大小变化趋势提取局部极值即波峰波谷值,并计算相应的波长,结合波纹度的定义完成波纹度计算。实验结果表明,该方法分析结果准确、效率高。
To measure the waviness of aircraft surface accurately and efficiently, an improved algorithm for the projection of points on parameter-curved surface is proposed. The point projection on curved surfaces is calculated by adopting the approach of elliptical torus patch approximation. Firstly, by using this algorithm, points are extracted from the surface’s massive measuring points and the offset value between measuring points and their projection on the theoretical positions is calculated. Secondly, the local extremum is extracted at the peak and valley of waviness according to the variation trend of the offset value. Then its corresponding wavelength is calculated. Finally, the waviness is calculated based on its definition. Experiments show that this method is highly efficient, and generates accurate results.
出处
《图学学报》
CSCD
北大核心
2016年第5期626-631,共6页
Journal of Graphics
基金
基于工艺驱动的全机全三维综合测量系统开发与集成技术项目(2013E11222)
飞机后段自动精准对合技术与成套设备项目(2014ZX04001-081-07)
关键词
波纹度
点到曲面投影
局部极值
飞机蒙皮
waviness
point projection on surfaces
local extremum
aircraft surface
