147 低周波大型構造物用2重動吸振器の設計法と応用(多自由度動吸振器による制振,OS-11 ダンピング(3))

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  • 147 Design Methods and an Application of the Dual Dynamic Vibration Absorber for Large-scale Structures with Low Frequencies

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The design methods of the optimum tuning and damping of the dual dynamic vibration absorber (D-DVA) for large-scale structures with very low frequencies were presented, arid the optimal construction layout which minimizes the undesirable moment applied to the base was examined. And then, for the both cases of displacement and force excitations, the approximate expressions for design parameters were proposed. Further, it was indicated that in the case of installing the D VA to the continuum structures subjected to the displacement excitation, the introduction of the new concept of the equivalent inertia mass in addition to the conventional equivalent mass and stiffness at the point of installation becomes necessary. Finally, by applying the present dual DVA to the vibration suppression of the first and the second vibration modes of a large-scale framework structure, the simulation results were obtained, showing the effectiveness of the present dual dynamic vibration absorber.

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