Reverse bump test for closed-loop identification of CD controller alignment
US7820012B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 2008 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Jan 3, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21G9/0045
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.