有效消除多视拼接累计误差的大曲面测量方法
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摘要
为了提高大尺寸曲面测量精度,综合利用精密机械、光电技术、CAD/CAM/CAT和自动控制等科学技术,将高精度测量设备与数控加工设备相结合,实现了大尺寸曲面在线检测加工一体化。在详细分析影响多视序列子轮廓拼接精度原因的基础上,为了减小多视拼接累计误差的影响,提出了基于互为基准的轮廓拼接策略和基于整体误差补偿的拼接方法,按照轮廓的封闭连续拼接误差最终为零的原则,实现累计误差的二次分配,减少序列轮廓数据连续拼接累计误差。实验结果表明:系统测量精度优于20μm。
For the purpose of improving the accuracy of measuring large-sized curved surfaces,precision machines,photoelectric technology,CAD/CAM/CAT and automatic control technology are employed comprehensively,and highprecision measuring equipment and numerically controlled processing equipment are combined to realize the integration of on-line inspection and processing of large-sized curved surfaces. According to a detailed analysis of factors that affect the precision of splicing sub-contours of a multi-view sequence,both a contour splicing strategy based on mutual reference and a splicing method based on integral error compensation are proposed to diminish the effect of accumulative errors resulting from multi-view splicing. Subsequently,quadratic assignment of accumulative errors is achieved in line with the principle that the closed continuous splicing error of contours is zero in the end,thus reducing the accumulative errors resulting from continuous splicing of sequential contour data. The results show that the accuracy of this system is higher than 20 μm.
For the purpose of improving the accuracy of measuring large-sized curved surfaces,precision machines,photoelectric technology,CAD/CAM/CAT and automatic control technology are employed comprehensively,and highprecision measuring equipment and numerically controlled processing equipment are combined to realize the integration of on-line inspection and processing of large-sized curved surfaces. According to a detailed analysis of factors that affect the precision of splicing sub-contours of a multi-view sequence,both a contour splicing strategy based on mutual reference and a splicing method based on integral error compensation are proposed to diminish the effect of accumulative errors resulting from multi-view splicing. Subsequently,quadratic assignment of accumulative errors is achieved in line with the principle that the closed continuous splicing error of contours is zero in the end,thus reducing the accumulative errors resulting from continuous splicing of sequential contour data. The results show that the accuracy of this system is higher than 20 μm.
引文
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[13]张小强,武欣,王伟荣,等.平面光学元件平面度动态干涉拼接测量[J].计量学报,2016,37(5):484-488.
[2]Franceschini F,Galetto M,Maisano D,et al.Large-scale dimensional metrology(LSDM):from tapes and theodolites to multi-sensor systems[J].International Journal of Precision Engineering&Manufacturing,2014,15(8):1739-1758.
[3]唐七星,余晓芬,王标.超大尺寸激光测距大型测控网络研制[J].计量学报,2016,37(4):360-365.
[4]倪爱晶,郑联语.基于形状误差不确定度的大尺寸测量系统优化配置方法[J].计量学报,2011,32(4):289-295.
[5]张玉存,付献斌,齐艳德,等.大型筒节热态锻件外径在线测量技术研究[J].计量学报,2011,32(5):427-431.
[6]徐玉华,龚文全,苏昂,等.近似平面场景多视点图像拼接算法[J].国防科技大学学报,2014,36(2):148-155.
[7]李鹏俊,李建增,宋瑶,等.基于仿真的无人机遥感图像拼接误差分析[J].计算机应用,2015,35(4):1116-1119.
[8]Ellanti P,Mccormack D.Digital stitching errors and the scoliosis clinic[J].European Orthopaedics&Traumatology,2014,5(2):161-163.
[9]Reshef O,Moebius M G,Mazur E.Extracting loss from asymmetric resonances in micro-ring resonators[J].Journal of Optics,2017,19(6):1-8.
[10]潘存强,罗立凤.数控技术的新发展---开放式数控系统[J].宝钢技术,2002,(4):1-4.
[11]Ramesh R,Poo A N.Intelligent ethernet based open architecture control system for machine tools[C]//Proceedings-ICIS.Shanghai,China,2009:612-616.
[12]唐琎,谷士文,蔡自兴.图象拼接误差的理论分析[J].小型微型计算机系统,2003,24(12):2185-2189.
[13]张小强,武欣,王伟荣,等.平面光学元件平面度动态干涉拼接测量[J].计量学报,2016,37(5):484-488.