Effect of Active Control on Closely Spaced Natural Frequencies

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by K. Xu, Northwestern Univ, Evanston, United States,
P. Warnitchai, Northwestern Univ, Evanston, United States,
T. Igusa, Northwestern Univ, Evanston, United States,

Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract: Current problems in structural control involve structures with closely spaced natural frequencies (M.J. Balas, 1983). The purpose of this paper is to show how control affects a structure with closely spaced natural frequencies. To develop clear and concrete results, the fundamental case of a structure with only two modes with a single, scalar control input is examined. This demonstrates the effectiveness and limitations of using a single control for two nodes. The following three control algorithms are used: velocity feedback, pole allocation, and optimal control.

Subject Headings: Hydraulic structures | Natural frequency | Structural analysis | Active control | Concrete | Case studies | Concrete structures |

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