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Paper machine grade changes : closed-loop control

Tutkimustuotos

Standard

Paper machine grade changes : closed-loop control. / Kuusisto, R.

Tampere : Tampere University of Technology, 2008. 107 s. (Tampere University of Technology. Publication; Vuosikerta 780).

Tutkimustuotos

Harvard

Kuusisto, R 2008, Paper machine grade changes : closed-loop control. Tampere University of Technology. Publication, Vuosikerta. 780, Tampere University of Technology, Tampere.

APA

Kuusisto, R. (2008). Paper machine grade changes : closed-loop control. (Tampere University of Technology. Publication; Vuosikerta 780). Tampere: Tampere University of Technology.

Vancouver

Kuusisto R. Paper machine grade changes : closed-loop control. Tampere: Tampere University of Technology, 2008. 107 s. (Tampere University of Technology. Publication).

Author

Kuusisto, R. / Paper machine grade changes : closed-loop control. Tampere : Tampere University of Technology, 2008. 107 Sivumäärä (Tampere University of Technology. Publication).

Bibtex - Lataa

@book{6332afd5dc2d45cba9eef74c2f81b5f5,
title = "Paper machine grade changes : closed-loop control",
abstract = "This study handles problems and solutions related to the paper machine grade change. The perspective is in the qualitative study of mass-flow phenomena during manipulation of the variables that change the production rate either locally as a transient or more permanently. In many cases the grade changes are done using a method where the machine speed is left out from the manipulated variables. The weakness of this method is that almost all changes include basis weight change and when done at constant machine speed, it results in a production rate change even when the process would not allow this to occur. The phenomena related to the speed change through the drying section are simulated using ramp-like excitation signals for several variables. Some of the simulations cases are such that they can only be implemented in a simulation environment. Basic principles of the multivariable model predictive grade change control are introduced utilising target value trajectories for the controlled variables. Trajectory target values are based on mass-flow calculations while trajectory timing is based on simultaneous machine speed change timing. The problem related to the usage of mass-flows as measurement during the machine speed change in a delay-system is studied. A simple compensation in addition to trajectory timing changes is developed to solve the problem. Finally, the head-box flow change, a typical disturbance source in all paper machine grade changes, is analysed and a non-linear prediction based disturbance compensation method is proposed.",
author = "R. Kuusisto",
note = "Awarding institution:Tampere University of Technology",
year = "2008",
month = "12",
day = "2",
language = "English",
isbn = "978-952-15-2078-5",
series = "Tampere University of Technology. Publication",
publisher = "Tampere University of Technology",

}

RIS (suitable for import to EndNote) - Lataa

TY - BOOK

T1 - Paper machine grade changes : closed-loop control

AU - Kuusisto, R.

N1 - Awarding institution:Tampere University of Technology

PY - 2008/12/2

Y1 - 2008/12/2

N2 - This study handles problems and solutions related to the paper machine grade change. The perspective is in the qualitative study of mass-flow phenomena during manipulation of the variables that change the production rate either locally as a transient or more permanently. In many cases the grade changes are done using a method where the machine speed is left out from the manipulated variables. The weakness of this method is that almost all changes include basis weight change and when done at constant machine speed, it results in a production rate change even when the process would not allow this to occur. The phenomena related to the speed change through the drying section are simulated using ramp-like excitation signals for several variables. Some of the simulations cases are such that they can only be implemented in a simulation environment. Basic principles of the multivariable model predictive grade change control are introduced utilising target value trajectories for the controlled variables. Trajectory target values are based on mass-flow calculations while trajectory timing is based on simultaneous machine speed change timing. The problem related to the usage of mass-flows as measurement during the machine speed change in a delay-system is studied. A simple compensation in addition to trajectory timing changes is developed to solve the problem. Finally, the head-box flow change, a typical disturbance source in all paper machine grade changes, is analysed and a non-linear prediction based disturbance compensation method is proposed.

AB - This study handles problems and solutions related to the paper machine grade change. The perspective is in the qualitative study of mass-flow phenomena during manipulation of the variables that change the production rate either locally as a transient or more permanently. In many cases the grade changes are done using a method where the machine speed is left out from the manipulated variables. The weakness of this method is that almost all changes include basis weight change and when done at constant machine speed, it results in a production rate change even when the process would not allow this to occur. The phenomena related to the speed change through the drying section are simulated using ramp-like excitation signals for several variables. Some of the simulations cases are such that they can only be implemented in a simulation environment. Basic principles of the multivariable model predictive grade change control are introduced utilising target value trajectories for the controlled variables. Trajectory target values are based on mass-flow calculations while trajectory timing is based on simultaneous machine speed change timing. The problem related to the usage of mass-flows as measurement during the machine speed change in a delay-system is studied. A simple compensation in addition to trajectory timing changes is developed to solve the problem. Finally, the head-box flow change, a typical disturbance source in all paper machine grade changes, is analysed and a non-linear prediction based disturbance compensation method is proposed.

M3 - Doctoral thesis

SN - 978-952-15-2078-5

T3 - Tampere University of Technology. Publication

BT - Paper machine grade changes : closed-loop control

PB - Tampere University of Technology

CY - Tampere

ER -