Title: Vibration control using analytically based artificial intelligence
Abstract: Vibration control of structures is becoming increasingly important as serviceability requirements are becoming more severe. Tuned mass dampers, which are also known as dynamic vibration absorbers, are commonly used in structural control because of their relatively high performance and compactness. In this thesis, novel design methods are proposed for tuned mass dampers with passive, semi-active and active configurations. These design methods are developed based on analytical solutions derived by perturbation analysis of structure/tuned mass damper systems. Because all the analytical solutions are in simple form, they provide useful insight into the design of tuned mass dampers. Thus it is possible to solve design problems without recourse to numerical parametric study. The thesis consists of three major parts. The first deals with design of passive tuned mass dampers for continuous structures. The validity and limitations of the commonly used single mode approximation is established analytically, with particular attention to the case of structures with closely spaced natural frequencies. In the second part, a semi-active tuned mass damper with adjustable initial displacement and damping is proposed. The proposed method enhances the performance of the passive device considerably. Active tuned mass dampers are introduced in the third part. Closed form solutions are obtained for the optimal control laws with quadratic performance index. The treatment of constraints on actuator capacity and displacement of tuned mass damper which are important in civil structures is discussed in detail. These solutions are combined with those developed in the second part to construct an intelligent control algorithm. The algorithm is rule-based and the control rules are derived from analytical and intuitive knowledge on tuned mass dampers. The controller designed by the proposed method has higher performance than the conventional linear optimal controller especially when the displacement of the tuned mass damper is restricted. The active and semi-active control algorithms developed in the second and third parts are applied to continuous structures by the theory developed in the first part and their performance is demonstrated by numerical simulations.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
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Cited By Count: 3
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