Reverse bump test for closed-loop identification of CD...

Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing

Reexamination Certificate

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C162S263000, C700S128000, C700S129000, C034S114000

Reexamination Certificate

active

07459060

ABSTRACT:
A reverse bump test, for identifying the alignment of a sheetmaking system while the system remains in closed-loop control, includes the following steps: (a) leaving the control system in closed-loop, (b) artificially inserting a step signal on top of the measurement (or setpoint) profile from the scanner, (c) recording the data as the control system moves the actuators to remove the perceived disturbance (or setpoint change), and (d) refining or developing a model from the artificial measurement disturbance (or setpoint change) to the actuator profile. The technique supplies the probing/perturbation signal to the scanner measurement, which is equivalent to supplying the probing/perturbation signal to the setpoint target) rather than inserting bumps via the actuator set points as has been practiced traditionally.

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Tim Mast, et al, New Optimization of a CD Control For Global and Localized Profile Performance, TAPPI Spring Technical Conference & Trade Fair, Canada 2003.

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