Model predictive controller for coordinated cross direction and machine direction control

A technology for coordinated control and machine direction, applied in general control systems, calculations using non-numerical representations, adaptive control, etc.

Inactive Publication Date: 2009-07-29
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, only the MD actuator is used to control the CD average without the effect of the CD actuator on the CD average of the paper properties
Second, the CD actuators arrayed on this paper are only used to control the change in CD around the average value of the paper properties

Method used

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  • Model predictive controller for coordinated cross direction and machine direction control
  • Model predictive controller for coordinated cross direction and machine direction control
  • Model predictive controller for coordinated cross direction and machine direction control

Examples

Experimental program
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Embodiment Construction

[0032] figure 1 A typical paper machine 12 is shown as an example of a paper machine that may be controlled according to the method of the present invention. The machine direction MD is defined as the direction 20 along which the paper is transported through the paper machine when it is produced. The transverse direction CD is the direction 22 perpendicular to the MD. The entire papermaking process according to the shown paper machine initially consists of feeding wood pulp into a head box 1 at the wet end 14 of the machine. The headbox 1 serves to spread the pulp sparsely onto a moving wire 16 across the width of the paper machine. In other parts of the paper machine 12, the water is removed as the manufactured paper is conveyed through a plurality of rollers that apply heat and pressure to the paper to form the paper. The finished sheet is finally wound on a storage drum 11 at the machine trunk 18 .

[0033] In order to control the papermaking process, paper properties m...

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PUM

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Abstract

The present invention discloses a method for coordinated control of machine direction MD and cross direction CD actuators in a paper machine for the manufacture of paper of a certain material. The method includes measuring a plurality of paper properties at regular time intervals to collect paper measurement data. The paper measurement data is manipulated to create a plurality of paper property measurement arrays, which are then mapped to a common resolution. Concatenate common resolution paper property measurement arrays into a larger one-dimensional common resolution measurement array. A common resolution measurement array and an array of past actuator setpoint changes are used as input to a paper machine process model state observer to generate an estimated current internal state of the paper manufacturing process. Concatenates multiple future paper property target arrays into a single target array. An array of future predictions of paper properties is generated using the estimated current internal state of the papermaking process and a paper machine process model. The array of future predictions of paper properties, the objective array, the objective function weights, the array of final actuator setpoints, and the strong constraints are input into the objective function, which is solved, resulting in the coordinated MD and CD control for the papermaking process Optimal variation of actuator setpoints.

Description

technical field [0001] The present invention relates to the control of the papermaking process and more particularly to a method for coordinating the operation of machine direction and transverse actuators in a papermaking machine. Background technique [0002] Control of paper properties in a paper machine involves bringing the paper properties as close as possible to target values. There are two different sets of actuators for controlling the properties of the paper. First, there are machine direction (MD) actuators which only affect the cross direction (CD) average of the paper properties. Each MD actuator can have a different dynamic response to paper properties. Second, have CD actuators that line up the paper in the CD direction. Each CD actuator array can affect the average of the paper properties as well as the CD shape. CD actuators can have different dynamic responses and different spatial responses to paper properties. The problem with overall control of pape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04G01C9/00G06F7/66G06F15/00G06F19/00
CPCD21G9/0027
Inventor J·U·贝克斯特伦P·何
Owner HONEYWELL INT INC
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