Date of Award

Spring 1997

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Aerospace Engineering

Committee Director

Thomas E. Alberts

Committee Member

Brett Newman

Committee Member

Oscar R. Gonzalez

Call Number for Print

Special Collections; LD4331.E535 K37

Abstract

The use of feedforward control for dynamic modification is relatively new to the area of structural vibration control. In this thesis the disturbance path dynamics of a flexible aluminum beam, pinned at both ends and under the influence of broadband excitation inputs, are modified through the use of feedforward control. The ideal algebraically determined feedforward control method for response cancellation is first presented. Theoretically, this compensator modifies the disturbance path dynamics to any desired behavior. This ideal algebraic approach can only be used for minimum phase systems. In non-minimum phase systems, right half s-plane plant zeros emerge as unstable poles in the compensated system, hence an alternative method is required. A technique called the correction factor method is introduced, which can arbitrarily place the disturbance path poles of the controlled system. The dynamic behavior of the system using the correction factor feedforward compensator is compared to the theoretical behavior of the ideal feedforward compensated system. The performance of a reduced-order correction factor type compensator is also investigated. Computer simulations of the system dynamic response, with continuous and discrete implementations of the correction factor compensator, are illustrated. Experimental results are used to verify the behavior of the analytical model.

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DOI

10.25777/54gj-r453

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