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

### 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
page revision: 2, last edited: 01 Jun 2011 10:12