複数の衝突体を有するインパクトダンパの制振効果

概要

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We made a test apparatus which consists of a cantilevered beam onto which a primary mass with an impact damper was attached to the free end of the beam. We measured the acceleration time history of the primary mass when the frequency of the foundation excitation was swept up under the constant magnitude of the acceleration of the foundation while changing the clearance between the impactor and the wall of the primary system. The experimental tests indicate that the acceleration level decreases at resonance when the number of the impactor increases. We also created a simulation program to calculate the vibration response of the impact damper, and verified that the calculation result was in accordance with the experimental one. Furthermore, we calculated mechanical energy of the vibration system to explain the mechanism of damping in the case of multi-impactor.