Date of Award

Summer 2005

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Aerospace Engineering

Committee Director

Chuh Mei

Committee Member

Jen-Kuang Huang

Committee Member

Brett A. Newman

Abstract

This thesis employs a coupled structural-electrical finite element modal formulation for the control of nonlinear free vibrations, and supersonic panel flutter of beams and composite plates with and without thermal environment. Multiple modes of the nonlinear free vibration and supersonic panel flutter are considered in the closed loop simulations. Two different controllers are designed and investigated. The first one is the output feedback controller comprised of a Linear Quadratic Regulator (LQR) and an Extended Kalman Filter (EKF). EKF considers the nonlinear state space matrix and has a gain sequence evaluated on-line. Thus the LQR/EKF nonlinear controller has more accurate state estimation over Linear Quadratic Gaussian (LQG) controller for the nonlinear dynamics. The second controller is the output feedback adaptive LQR/EKF controller. This adaptive controller includes a modal frequency identification and state estimation algorithm.

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DOI

10.25777/4h29-pv56

ISBN

9780542403200

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