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 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 °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″.
Highlights
The precision measuring instruments such as laser tracker, articulated coordinate measuring machine (ACMM) and total station are widely used in the area of field measurement for its portability.The rotation joint with high-accuracy angle sensor is the core component of these instruments.The angle measurement accuracy of angle sensors has great influence on the measurement performance of these precision instruments
The rotation joint which was installed close to the bottom of the ACMM is shown as an example
The remained angle measurement errors were compensated by the Fourier expansion mentioned above
Summary
The precision measuring instruments such as laser tracker, articulated coordinate measuring machine (ACMM) and total station are widely used in the area of field measurement for its portability.The rotation joint with high-accuracy angle sensor is the core component of these instruments.The angle measurement accuracy of angle sensors has great influence on the measurement performance of these precision instruments. The precision measuring instruments such as laser tracker, articulated coordinate measuring machine (ACMM) and total station are widely used in the area of field measurement for its portability. The rotation joint with high-accuracy angle sensor is the core component of these instruments. The angle measurement accuracy of angle sensors has great influence on the measurement performance of these precision instruments. Rotary encoders are widely used as high-accuracy angle sensors in these instruments. The ambient temperature in industrial site varies greatly from place to place. The measurement accuracy of these precision instruments is influenced greatly by ambient temperature
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