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UBC Theses and Dissertations
Cross directional response modeling, identification and control of dry weight profile on paper machines Ghofraniha, Jahangir
Abstract
In this thesis, dry weight response modelling, identification and control of the cross directional (CD) profile of a paper sheet is investigated. To date, the available modelling strategies are either very detailed and require computational fluid dynamics techniques or are based on purely input/output identification schemes. The developed model is based on physical principles and is simple enough to be used for CD control purposes. The model is developed as a dispersive wave at the surface of slurry. The combination of surface wave theory and drainage theory results in a closed form model that can simulate different scenarios on the paper machine. Based on the developed model, an identification scheme is developed to identify parameters. The identification scheme makes use of continuous wavelet transform. The identification was applied to simulated data and industrial data. The continuous wavelet transform led to a new CD control algorithm that eliminates the mapping problem which is a draw back of CD control systems due to ill-conditioning and lack of inverse at all times. The control algorithm is demonstrated by application to industrial data.
Item Metadata
Title |
Cross directional response modeling, identification and control of dry weight profile on paper machines
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
In this thesis, dry weight response modelling, identification and control of the cross directional
(CD) profile of a paper sheet is investigated. To date, the available modelling strategies are either
very detailed and require computational fluid dynamics techniques or are based on purely input/output
identification schemes. The developed model is based on physical principles and is simple enough
to be used for CD control purposes. The model is developed as a dispersive wave at the surface
of slurry. The combination of surface wave theory and drainage theory results in a closed form
model that can simulate different scenarios on the paper machine. Based on the developed model,
an identification scheme is developed to identify parameters. The identification scheme makes use of
continuous wavelet transform. The identification was applied to simulated data and industrial data.
The continuous wavelet transform led to a new CD control algorithm that eliminates the mapping
problem which is a draw back of CD control systems due to ill-conditioning and lack of inverse at
all times. The control algorithm is demonstrated by application to industrial data.
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Extent |
9610249 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-31
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065124
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.