Effect of Active Control on Closely Spaced Natural Frequenciesby K. Xu, Northwestern Univ, Evanston, United States,
P. Warnitchai, Northwestern Univ, Evanston, United States,
T. Igusa, Northwestern Univ, Evanston, United States,
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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