Experimental Evaluation of Reduced Models of Large Structural Systems for Active Vibration Control

Australian Earthquake Engineering Society
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Boffa John and Zhang Nong 2005, 'Experimental Evaluation of Reduced Models of Large Structural Systems for Active Vibration Control', Australian Earthquake Engineering Society, Albury, Australia, pp. 23-1-23-7.
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This paper assesses the performance of reduced plant models of large and flexible structures obtained from using two different model reduction methods in vibration analysis and active control. The Dynamic model reduction method and the Guyan method are compared using experimental test results. A tall building model with 20 degrees of freedom was used as the plant, with a linear motor installed at the top storey for the purposes of active-damping. Although the results of simulations would suggest that both models perform sufficiently well, experimental testing proved that only the Dynamic model performs adequately for this specific application of active control. The problem associated with the Guyan method, and with most other model reduction methods, is that they assume that the system behaves strictly according to linear elastic theory. The versatility of the Dynamic model reduction method is such that it provides the option of obtaining system parameters from experiment, not just from theory. The experimental procedure ensures that the Dynamic model reduction method forms an accurate description of the real system dynamics. The applicability of this method for obtaining low-order plant models in the active vibration control of flexible structures was demonstrated through physical testing of the structure, while it was subject to sinusoidal excitation. The tests have shown that the Dynamic model reduction method can be used as an alternative approach for model reduction of structural systems for the purpose of active vibration control.
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