Closed-loop Alignment Identification with Adaptive Probing Signal Design, 2012 PaperCon Conference

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CD Alignment is one of the key parameters that are required to guarantee a good feedback CD control performance. It is typically identified by performing an open loop “step” or “bump” test. Most paper mills depend on operator's observation on the occurrence of misalignment symptoms (actuator picketing, increased profile variability and/or streaks, poor reel build, etc) before manually initiating an open-loop bump test. The drawbacks of this approach are obvious: firstly, the feedback CD control performance has already degraded when the correcting action is initiated; secondly, the open-loop bump tests interrupt the paper machine normal operation; and thirdly, there is no feedback control over paper qualities during open-loop tests.