关键词: 飞机装配, 形状传感, 光纤布拉格光栅, 曲面重建

Abstract: In the process of aircraft components assembly,the deformation of skin has vital influence on shape accuracy of product.Faced with the requirement of monitoring such deformation,an approach of surface modeling based on curve reconstruction was proposed.Attaching the shape memory alloy substrate with orthogonal fiber Bragg grating sensors to the skin and realizing the transition from curvature information to the positional information of the points on curves by calibration,the skin modeling could be completed.The results of simulation and experiment showed that the approach presented realized the perception of the skin’s bending form in the scene of assembly.Based on the measuring result of the C-Track,the mean and maximum absolute errors of the distances between pair of the feature points on model were 3.58mm and 8.67 mm respectively,while the mean and maximum relative errors were 0.70% and 1.94% respectively.In addition,the variation of the curve modeling error was analyzed.The mathematical proof and simulation results showed that the variation with interval of measuring points was ascending and the increasing rate was related to the curvature and torsion.Moreover,the variation with recursive order was not necessarily ascending,it had correlations with factors such as monotonicity of curvature.

Key words: aircraft assembly, shape sensing, fiber Bragg grating, surface reconstruction