Development of model-based control for Bridgman crystal growth

Paul Sonda, Andrew Yeckel, Prodromos Daoutidis, Jeffrey J. Derby

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

We study the feasibility of using crucible rotation with feedback control to suppress oscillatory flows in two prototypical vertical Bridgman crystal growth systems - a stabilizing configuration driven by a time-oscillatory furnace disturbance and a thermally destabilized configuration, which exhibits inherent time-varying flows. Proportional controllers are applied to the two systems, with volume-averaged flow speed chosen as the single controlled output and crucible rotation chosen as the manipulated input. Proportional control is able to significantly suppress oscillations in the stabilizing configuration. For the destabilized case, control is effective for small-amplitude flows but is generally ineffective, due to the exacerbating effect of crucible rotation on the time-dependent flows exhibited by this system.

Original languageEnglish (US)
Pages (from-to)182-189
Number of pages8
JournalJournal of Crystal Growth
Volume266
Issue number1-3
DOIs
StatePublished - May 15 2004
EventProceedings of the Fourth International Workshop on Modeling - Kyushu, Japan
Duration: Nov 4 2003Nov 7 2003

Keywords

  • A1. Control
  • A1. Fluid Mechanics
  • A1. Materials processing
  • A1. Mathematical modelling
  • A1. Nonlinear dynamics
  • A2. Accelerated crucible rotation technique

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