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Robust Loopshaping for Process Control


Braatz, Richard Dean (1993) Robust Loopshaping for Process Control. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/vqmv-kw76.


Strong trends in chemical engineering and plant operation have made the control of processes increasingly difficult and have driven the process industry's demand for improved control techniques. Improved control leads to savings in resources, smaller downtimes, improved safety, and reduced pollution.

Though the need for improved process control is clear, advanced control methodologies have had only limited acceptance and application in industrial practice. The reason for this gap between control theory and practice is that existing control methodologies do not adequately address all of the following control system requirements and problems associated with control design:

  • The controller must be insensitive to plant/model mismatch, and perform well under unmeasured or poorly modeled disturbances.
  • The controlled system must perform well under state or actuator constraints.
  • The controlled system must be safe, reliable, and easy to maintain.
  • Controllers are commonly required to be decentralized.
  • Actuators and sensors must be selected before the controller can be designed.
  • Inputs and outputs must be paired before the design of a decentralized controller.

A framework is presented to address these control requirements/problems in a general, unified manner. The approach will be demonstrated on adhesive coating processes and distillation columns.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Chemical Engineering)
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Morari, Manfred
Thesis Committee:
  • Morari, Manfred (chair)
  • Gavalas, George R.
  • Doyle, John Comstock
  • Murray, Richard M.
Defense Date:18 May 1993
Record Number:CaltechETD:etd-08222007-105213
Persistent URL:
Braatz, Richard Dean0000-0003-4304-3484
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3199
Deposited By: Imported from ETD-db
Deposited On:23 Aug 2007
Last Modified:30 Aug 2022 21:51

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