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Rapid transmission rate of optical fiber can ensure the minimal synchronous error.
If remote sensing images are used, the results may be better, at least towards a synchronous error.
Moreover, to enhance the robustness to uncertainties and to eliminate the synchronous error of dual linear motors, the CSMC with a SFNN compensator is proposed where the SFNN compensator is designed mainly to compensate the synchronous error.
In the literature, by taking account of input nonlinearity, the magnitudes of bounded nonlinear dynamics of synchronous error system were required in the designed sliding mode controller.
This experimental approach used force and accelerometer data with the help of modal analysis to conclude that spindle star is a synchronous error and is a function of rotational frequency of the spindle and its harmonics.
The error motion is observed to be highly repeatable with less than 100 nm asynchronous errors, and a simple analytical model enables the prediction of the synchronous error motion using measurements of the rotor's roundness profiles.
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Also, to reduce position synchronous errors caused by different motor dynamics, each axis is coupled by the maximum error comparison scheme.
However, as the synchronous errors, they do not have the influence on the spatial frequencies of machined surface in the feed direction.
When the spindle rotation speed is 390 r/min, the time domain frequencies of the main synchronous errors are 6.5 Hz, 13 Hz, 77.5 Hz and 154.9 Hz.
For the spindle errors, only the asynchronous errors affect the spatial frequencies in the feed direction, and the synchronous errors has no effect on the spatial frequencies in that direction [20].
Moreover, in these four main synchronous errors, only the errors with the frequency of 77.5 Hz and 154.9 Hz have certain influence on the spatial frequencies of machined surface in the cutting direction.
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