Paper Info
Title
Compensation of Rotary Encoders Using Fourier Expansion-Back Propagation Neural Network Optimized by Genetic Algorithm.
Abstract
The measurement accuracy of the precision instruments that contain rotation joints is influenced significantly by the rotary encoders that are installed in the rotation joints. Apart from the imperfect manufacturing and installation of the rotary encoder, the variations of ambient temperature could cause the angle measurement error of the rotary encoder. According to the characteristics of the <mml:semantics>2 pi</mml:semantics> periodicity of the angle measurement at the stationary temperature and the complexity of the effects of ambient temperature changes, the method based on the Fourier expansion-back propagation (BP) neural network optimized by genetic algorithm (FE-GABPNN) is proposed to improve the angle measurement accuracy of the rotary encoder. The proposed method, which innovatively integrates the characteristics of Fourier expansion, the BP neural network and genetic algorithm, has good fitting performance. The rotary encoder that is installed in the rotation joint of the articulated coordinate measuring machine (ACMM) is calibrated by using an autocollimator and a regular optical polygon at ambient temperature ranging from 10 to 40 degrees C. The contrastive analysis is carried out. The experimental results show that the angle measurement errors decrease remarkably, from 110.2 " to 2.7 " after compensation. The mean root mean square error (RMSE) of the residual errors is 0.85 ".
Year
DOI
Venue
2020
10.3390/s20092603
SENSORS
Keywords
DocType
Volume
angle measurement error,BP neural network,genetic algorithm,rotary encoder,temperature compensation,instrument
Journal
20
Issue
ISSN
Citations 
9
1424-8220
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
Hua-Kun Jia100.34
Liandong Yu201.69
Yi-Zhou Jiang300.34
Hui-Ning Zhao400.34
Jia-Ming Cao500.34