Periodic error quantification for non-constant velocity motion |
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Authors: | Tony L Schmitz Chirag AdhiaHyo Soo Kim |
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Affiliation: | Department of Mechanical and Aerospace Engineering, University of Florida, 237 MAE-B, Gainesville, FL 32611, United States |
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Abstract: | This paper describes a procedure for analyzing non-stationary (variable frequency content) periodic error signals obtained during accelerating or decelerating motion. This capability is important due to the recent interest in real-time compensation of periodic error for precision positioning systems. In order to apply the spatial Fourier transform to the non-stationary signal, the constant time interval signals are resampled by linear interpolation using a constant spatial interval. Numerical and experimental results are provided for constant acceleration and sinusoidal motion profiles. |
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Keywords: | Interferometry Heterodyne Nonlinearity Non-stationary Fourier transform |
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