Roll eccentricity on strip thickness gauge has been a vital issue among rolling engineers. We present the results of basic consideration of roll eccentricity and its effects on strip thickness gauge. We analyzed some solutions comparatively and show a new application of digital filtering technology. Digital filter that estimates directly the eccentricity waveform along with back up roll rotation has only little effect on thickness gauge. Any type of roll force automatic gauge control works without any inconsistency. The proposed roll eccentricity control is simple and can be installed in any real time programmable logic controllers.
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