SEMI-ACTIVE VIBRATION CONTROL FOR THE 3RD GENERATION BENCHMARK PROBLEM INCLUDING SPILLOVER SUPPRESSION

Abstract eng:
New control algorithms that combine spillover suppression with semi-active modal vibration control via the use of magnetorheological (MR) dampers are studied. The advantages of this approach include the traditional positive attributes of MR dampers as well as more efficient use of the dampers obtained by targeting control effort at high energy modes and preventing spillover. Strategies for this combined approach are compared to existing algorithms that concentrate solely upon vibration control. Performance measure improvements have been found and are discussed. In the context of the benchmark problem, one structure is shown to possess vibration modes that involve primarily vertical motion with virtually no horizontal displacements. Some of these vertical vibration modes occur at relatively low frequencies, and their presence can produce unexpected behaviors. The impact of including these modes in the new control/spillover algorithms has been quantified and found to be significant. The modeling of this structure has been investigated to determine the relevance of these modes to the actual behavior of the structure. The consequences of this for all structural control algorithms are discussed.

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