On a new systematic feedback control method based on suboptimal control theory
- 주제(키워드) 도움말 Suboptimal control , Feedback control , Taylor vortex , Turbulent channel flow
- 발행기관 서강대학교 일반대학원
- 지도교수 강성원
- 발행년도 2016
- 학위수여년월 2016. 2
- 학위명 석사
- 학과 및 전공 일반대학원 기계공학과
- 실제URI http://www.dcollection.net/handler/sogang/000000058773
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권보호를 받습니다.
초록/요약
The main objective of this study is to develop a new systematic flow control approach based on the suboptimal feedback control (SFC) theory by addressing a few issues in controlling flows for a practical purpose. The Fréchet differential is applied to the governing equations to derive a systematic controller based on partial differential equations. In the previous SFC theory, a physical assumption or tuning process is necessary for a user-defined parameter to control flows successfully. In the present study, this issue is addressed by introducing an approximate optimality condition based on a quadratic control sensitivity. In order to build a practical control framework, the revised theory is reformulated as a tabulation approach using a modified Green’ s function method, which achieves both efficiency and accuracy. The effectiveness of the proposed method is tested using laminar and turbulent flows such as a two-dimensional Taylor vortex problem and turbulent channel flow. As a result, the proposed approach shows a similar or better control performance compared to the previous one, without a need to determine a control parameter.
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