ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Instrumentation, Control and System Engineering
Modelling and Application of Signal Decoupling of Adjacent Channels of a Whole-Roller Seamless Flatness Meter
Huaxin YuDongcheng WangHongmin LiuTongyuan ZhangLipo Yang
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2020 Volume 60 Issue 5 Pages 939-947


For ultra-thin and super-wide cold rolled strips, the flatness problem are still very conspicuous. To ensure that the surface of a strip is not scratched, a whole-roller seamless flatness meter (abbreviated as WRS flatness meter) is developed. Due to the structure of the measuring roll, which has cylindrical holes under its surface, both the signal of the measuring channels and the signal of the adjacent channels will be significantly interfered when a load is applied to a WRS flatness meter, causing flatness measurement errors. To eliminate mutual interference between channels, flatness measuring principle and channel coupling mechanism are analyzed, and the concept and model of coupling coefficient are proposed. Then, some examples are given to illustrate significant errors caused by coupling, which demonstrates the necessity of decoupling the channels. Coupling coefficients between the channels are obtained by experimental calibration, and interference between the channels is eliminated with a decoupling matrix equation. Through simulation and industrial applications, it is shown that the theoretical model proposed in this paper realizes decoupling of the channels of the WRS flatness meter, which improves flatness detection and controlling accuracy.

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© 2020 by The Iron and Steel Institute of Japan
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