Friday 20 May 2011 Project Description

Subject: Viscosity control in polymer extrusion
Date and Location: 20 May 2011 10:00 - 11:30, 7th floor Conference Room, Ashby
Attendees: Kang Li, Minrui Fei, Xueqin Liu (Amy), Jing Deng, Chamil, Wanqing Zhao (Horace), Long Zhang (Will).
Message: None

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Kang

• Chamil did some work on fuzzy control
• We will develop practical control package
• The problem in system identification of viscosity: limited measurement
• The main concentration is control
  • reduce setting up time
  • controller with less data
• Viscosity equation:
  • $\eta = k \frac{\Delta P}{Q}$
  • where $\eta$ denotes the viscosity,
  • $\Delta P$ is the pressure drop at the die,
  • and $Q$ is the through put.
• The challenge here includes
  • How to measure $\Delta P$ and $Q$
  • What's the relationship between $\Delta P$ and $Q$
  • How to design experiment to collect data? and how many data points required for modelling or control?
• Fault diagnosis is used to monitor the control performance, and help to choose proper control strategy while the process condition changes.
• The plant is linear while the control output is nonlinear
• Have a look at wiener model (prof Bia's paper) and Hammerstein model