A Model-based Self-tuning Controller forThermoacoustic Instability
作者:
A. M. Annaswamy,
O. M. El Rifai,
M. Fleifil,
J. P. Hathout,
A. F. Ghoniem,
期刊:
Combustion Science and Technology
(Taylor Available online 1998)
卷期:
Volume 135,
issue 1-6
页码: 213-240
ISSN:0010-2202
年代: 1998
DOI:10.1080/00102209808924158
出版商: Taylor & Francis Group
关键词: Thermoacoustic instability;active control;adaptive;modeling;sensitivity
数据来源: Taylor
摘要:
Active Control of thermoacoustic instabilities in continuous premixed combustion processes is being increasingly investigated for operating at lean low NOxconditions. Recently, we have developed a model-based approach for active control design which accounts for the underlying acoustics, heat release dynamics, and sensor and actuator dynamics. While this model captures a number of the dominant dynamic features of a premixed laminar combustor, there are a number of uncertainties associated with it as well. In this paper, we study the sensitivity of this model with respect to parametric uncertainties, and the efficacy of a fixed control design for suppressing pressure oscillations. We show that under certain conditions, the fixed controller is inadequate and present a self-tuning controller which is capable of delivering the desired performance in the presence of these uncertainties. The controller proposed is based on a rigorous analytical foundation, and is shown through simulation results to lead to better performance than corresponding fixed controllers. Adaptive algorithms based on the LMS-filter are shown to result in numerical instabilities.
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