A Contact On-Machine Measurement Points’ Planning Method Based on Similarity of 3-D Process Element

Fu, Gaocai; Sheng, Buyun; Chen, Geng; Luo, Ruiping; Sheng, Ganlin; Lu, Yingkang

doi:10.1109/tim.2022.3212526

Cited by 2 publications

(1 citation statement)

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“…A large number of point cloud coordinates are generated after measurement. The question of how to arrange the number and position of measuring points is a key issue in balancing measurement accuracy and efficiency [19][20][21][22]. Based on the measuring point planning, optimizing the corresponding fitting methods for different structures is an effective way to further reduce the uncertainty of model parameters [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Measuring Point Planning and Fitting Optimization of the Flange and Spigot Structures of Aeroengine Rotors

Zhou,

Hu,

Jin

et al. 2023

Machines

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An optimized measuring point planning and fitting method for rotor flange and spigot structures was proposed to achieve precise measurement of position and pose of the aeroengine rotors during docking processes. Firstly, the impact of circumferential phase angle, distribution range angle, total number of measuring points, and number of distribution rings on measurement uncertainty was analyzed. The measuring point planning schemes for flange and spigot were proposed. Secondly, the Gauss Newton iterative solution principle considering damping factors was clarified. Subsequently, an optimized iterative reweighting method consisting of weight iterative estimation, singular value detection under the Chauvenet criterion, and clustering detection was proposed for fitting the flange annular end face. A mapping point total least squares method with practical geometric significance was proposed for fitting the spigot cylinder face. Finally, measuring and fitting experiments were performed. The singular measuring point detection methods were verified. Under the optimized fitting methods, the goodness of fit and average orthogonal distance of flange and spigot structures are 0.756 and 0.089 mm, respectively, which have higher fitting accuracy than the other traditional methods.

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