关键词: 飞机装配质量, 组合测量, 平差优化, 全局标定, 大尺寸测量

Abstract: To solve the contradiction between global digitizing and local precision control of large free-form shapes,a combined measurement and its global calibration based on combination of laser tracker and optical scanner was proposed.Aiming at providing observing target for detecting pose and orientation by means of the laser tracker,a base coordinate system was built on the scanner’s framework.By changing the relative positions between various devices of calibration system,the redundant observation data were obtained.The coordinate transformation matrix between self measurement coordination system and scanner coordinate system was conducted with a measuring adjustment optimization technique,whick was completed before the measurement to reduce the disturbance.The laser tracker was used to realize the on-time position detecting of optical scanner.Combined with the calibration result of base coordination system,the uniform transformation of each local view was achieved.All calibration works for base coordination system were carried out before the measurement,and no other relating works need to be performed again.Due to the fact that such a scheme avoided adding by intermediary calibration devices during the measurement,the coordination transforming links were reduced enormously,and the measuring precision and efficiency were improved significantly.Comparative experiments showed that the proposed global measurement technology could effectively control the overall error of measurement,and the demand for online detection of aircraft assembly quality could be reliably satisfied.

Key words: aircraft assembly quality, combining measurement, adjustment optimization, global calibration, large-scale measurement