4pNS8. Multivariable structural acoustic control with static compensation.

Session: Thursday Afternoon, December 5

Time: 4:00

Author: Robert L. Clark
Location: Dept. of Mech. Eng. and Mater. Sci., Duke Univ., P.O. Box 90300, Durham, NC 27708-0300
Author: David E. Cox
Location: NASA Langley Res. Ctr., Hampton, VA 23681-0001


The active control of turbulent boundary layer noise in commercial aircraft has gained significant interest in recent years, and, due to the stochastic nature of the disturbance, feedback control strategies are required. Linear quadratic Gaussian control has been proposed in the past [Baumann et al., J. Acoust. Soc. Am. (1991)], but compensators resulting from such control approaches are typically quite involved. The thrust of the current effort is to demonstrate that acceptable performance in structural acoustic control can be achieved with static compensation implemented through a multiple input, multiple output (MIMO) array of colocated transducers. Since static compensation requires a matrix of constant gains, it is easily realized in analog or digital hardware. By augmenting the system dynamics to include radiation filters, the dual Levine--Athans algorithm was implemented to design the appropriate static compensator. Results for various MIMO control cases are presented.

ASA 132nd meeting - Hawaii, December 1996