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ROBUST CONTROL OF A 2D ACOUSTIC DUCT
Hemanshu R. Pota** Ian R. Petersen** Atul G. Kelkar*
* Department of Mechanical Engineering, Iowa State University, Ames
IA 50011 USA, Telephone: 515 2940788, Email: akelkar@iastate.edu
** School of Electrical Engineering, UNSW at the Australian Defence
Force Academy, Canberra ACT, 2600, Australia. Telephone: +61 2
62688193, Fax: +61 2 62688443, Email: {hrp,irp}@ee.adfa.edu.au.
This paper reports the experimental results in the application of feedback control of acoustic noise in a 2D duct. It is shown that the feedback control of 2D ducts poses peculiar problems compared to simple 1D ducts. The chief amongst them are the need for explicit budgeting of uncertainties and dealing with high model orders. This paper demostrates a practical way to design controllers for such systems using minimax LQG methods. It is shown that an important step in the controller design is the proper choice of a weighting function. The results presented in this paper are impressive and they can be further improved by proper choice of actuator and sensor placements.
Keywords: Active noise control, robust control, minimax LQG control, acoustic duct, system identification, uncertainty modelling, two-dimensional duct
Session slot T-Th-M15: Applications of Robust Control I/Area code 2e : Robust Control
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