Design of Robust AMB Controllers for Rotors Subjected to Varying and Uncertain Seal Forces

Jonas Skjødt Lauridsen, Ilmar Santos

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Abstract

This paper demonstrates the design and simulation results of model based controllers for AMB systems, subjectedto uncertain and changing dynamic seal forces. Specifically, a turbocharger with a hole-pattern seal mounted acrossthe balance piston is considered. The dynamic forces of the seal, which are dependent on the operational conditions,have a significant effect on the overall system dynamics. Furthermore, these forces are considered uncertain.The nominal and the uncertainty representation of the seal model are established using results from conventionalmodelling approaches, i.e. CFD and Bulkflow, and experimental results. Three controllers are synthesized: I) AnH∞ controller based on nominal plant representation, II) A µ controller, designed to be robust against uncertaintiesin the dynamic seal model and III) a Linear Parameter Varying (LPV) controller, designed to provide a unifiedperformance over a large operational speed range using the operational speed as the scheduling parameter.
Original languageEnglish
Article number00618
JournalMechanical Engineering Journal
Volume4
Issue number5
Number of pages11
ISSN1881-1426
DOIs
Publication statusPublished - 2017

Keywords

  • Uncertain dynamic seal forces,
  • Robust control
  • LPV control
  • AMB
  • Turboexpander
  • Hole-pattern seal
  • Fluid interaction

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