A Method for Calculating the Error Control Weight of Key Measurement Feature Points in Position and Pose Adjustment of Large Parts of Aircraft Components
ZHANG Li,HUA Qiang
The School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
Abstract：To achieve the best assembly pose of large aircraft parts, a method of the analytic hierarchy process (AHP) combined with error evaluation is proposed, which can comprehensively evaluate the weights of key points in digital assembly and solve the problems of position and posture adjustments of large parts using the least square method with weight values to improve the assembly accuracy. The AHP and error assessment method determine the subjective and objective weights of key measurement feature points, respectively. The combination of these two methods is used to evaluate the weights comprehensively, with the minimum assembly error as the optimization goal. Weight allocation is applied to optimize the allocation of errors of several key points. In the case analysis, the error of the overdraft intersection point is reduced from 1.23 mm to 0.72 mm, which satisfies the tolerance requirement for each measurement point. The singular value decomposition algorithm is then used to calculate the initial value of the result and the Newton method is employed iteratively to obtain the optimal pose of the parts. The rationality of the weight distribution is verified through the measured data of mid-back fuselage docking.
张俐,华强. 飞机大部件位姿调整的关键测量特征点误差控制权值计算方法[J]. 计量学报, 2019, 40(3): 397-402.
ZHANG Li,HUA Qiang. A Method for Calculating the Error Control Weight of Key Measurement Feature Points in Position and Pose Adjustment of Large Parts of Aircraft Components. Acta Metrologica Sinica, 2019, 40(3): 397-402.
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2019, Vol. 40 
