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| A Method for Calculating Signal Period Based on Correlation Analysis in Roundness Measurement |
| XU Xiao-xuan1,KANG Yan-hui2,QIU Zu-rong1,MA Ai-wen1 |
1.TianJin University, Tianjin 300072, China
2.National Institute of Metrology, Beijing 100029, China |
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Abstract A solution to circumferential closure is discussed when roundness is measured by a single probe for field.The frequency domain characteristics of the measured signal was analyzed by the Fourier transform to obtain the frequency components of the signal, and its effects of noise and drift on them were eliminated by filtering.A method based on correlation analysis was proposed to accurately obtain the measurement signal period, and the correctness and reliability of the method are verified by MATLAB simulation analysis.The periodic calculation error as the frequency and amplitude of the signal was obtained by changing the frequency and amplitude of the measured signal (i.e.the rotational speed and eccentricity of the roundness measurement) respectively.The results show that the period calculation error decreases with the increasing of frequency, that is, the higher the frequency is, the closer the period obtained by this method is to the actual period of the signal.However, when the frequency is a constant, the period calculation error value does not change significantly with the amplitude.
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2018, Vol. 39 
