A direct method for synthesizing low-order optimal feedback control laws with application to flutter suppressionA direct method of synthesizing a low-order optimal feedback control law for a high order system is presented. A nonlinear programming algorithm is employed to search for the control law design variables that minimize a performance index defined by a weighted sum of mean square steady state responses and control inputs. The controller is shown to be equivalent to a partial state estimator. The method is applied to the problem of active flutter suppression. Numerical results are presented for a 20th order system representing an aeroelastic wind-tunnel wing model. Low-order controllers (fourth and sixth order) are compared with a full order (20th order) optimal controller and found to provide near optimal performance with adequate stability margins.
Document ID
19800061733
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mukhopadhyay, V. (NASA Langley Research Center Hampton, VA, United States)
Newsom, J. R. (NASA Langley Research Center Hampton, VA, United States)
Abel, I. (NASA Langley Research Center Hampton, Va., United States)