汽车车身拼接曲面光顺方法研究
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摘要
针对车身拼接曲面光顺精度低和光顺效率低等问题,提出不同曲率半径拼接曲面的光顺方法。对于大曲率半径的拼接曲面,根据曲面与点云贴合精度调节控制顶点排序;在小曲率半径的拼接曲面中,提取拼接边线并光顺,通过裁剪的方式重新构造曲面。实际应用表明,根据光顺精度确定的不同曲率半径拼接曲面的光顺方法,能够快速光顺出高品质车身A级曲面。
To solve the problems of low smoothness precision and low efficiency in auto-body blending surface, a smoothing method of blending surface with different curvature radius was proposed. For blending surface with large curvature radius, adjust the control vertex ordering based on the accuracy of surface and point cloud fitting. For blending surface with small curvature radius, extract the blending edges and smooth them, then reconstruct the surfaces by clipping.The practical application shows that the smoothing method of the blending surface with different curvature radius determined by the smoothing precision, can quickly smooth out high-quality auto-body class-A surfaces.
To solve the problems of low smoothness precision and low efficiency in auto-body blending surface, a smoothing method of blending surface with different curvature radius was proposed. For blending surface with large curvature radius, adjust the control vertex ordering based on the accuracy of surface and point cloud fitting. For blending surface with small curvature radius, extract the blending edges and smooth them, then reconstruct the surfaces by clipping.The practical application shows that the smoothing method of the blending surface with different curvature radius determined by the smoothing precision, can quickly smooth out high-quality auto-body class-A surfaces.
引文
[1]徐家川,雷雨成,洪英武,等.汽车车身A级曲面光顺方法[J].汽车技术,2008(2):17~20.
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[4]胡钢,戴芳,秦新强,等.四次带参Bézier曲线曲面的光滑拼接[J].上海交通大学学报,2010,44(11):1481-1485.
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[6]程丰备,刘振宇,谭建荣,等.NURBS曲面多分辨率光顺拼接及其在复杂产品变形设计中的应用[J].计算机辅助设计与图形学学报,2012,24(12):1640~1646.
[7]郭磊,阿丽莎,胡钢.双三次Q-Bézier曲面拼接的车身设计[J].机械科学与技术,2017,36(1):114~118.
[8]李龙,邹婷,王卫华.改进的曲面拼接技术在变曲率后视镜设计中的应用[J].中国科技论文,2016,11(17):1988-1990.
[9]施法中.计算机辅助几何设计与非均匀有理B样条[M].北京:高等教育出版社,2001.
[2]D Liu,F Gao.The G1Smooth Connection Algorithm Between Biquartic B-Spline Patches[J].IEEE International Conference on Intelligent Computing&Intelligent Systems,2009,3:52-56.
[3]XueZhang Liang,XiangJiu Che,Qiang Li.G2Continuity Conditions for Two Adjacent B-Spline Surfaces[J].Proceedings Geometric Modeling&Processing,2004,341:1~4.
[4]胡钢,戴芳,秦新强,等.四次带参Bézier曲线曲面的光滑拼接[J].上海交通大学学报,2010,44(11):1481-1485.
[5]徐家川,李迪,高尚鹏,等.基于UG的汽车车身复杂过渡曲面光顺方法[J].汽车技术,2009(7):51~55.
[6]程丰备,刘振宇,谭建荣,等.NURBS曲面多分辨率光顺拼接及其在复杂产品变形设计中的应用[J].计算机辅助设计与图形学学报,2012,24(12):1640~1646.
[7]郭磊,阿丽莎,胡钢.双三次Q-Bézier曲面拼接的车身设计[J].机械科学与技术,2017,36(1):114~118.
[8]李龙,邹婷,王卫华.改进的曲面拼接技术在变曲率后视镜设计中的应用[J].中国科技论文,2016,11(17):1988-1990.
[9]施法中.计算机辅助几何设计与非均匀有理B样条[M].北京:高等教育出版社,2001.