シリコンゴムと金属錘を用いた小型動吸振器の設計及びその制振効果の検証

抄録

To suppress vibration or inhibit the transmission of acoustic waves, an acoustic metamaterial component consisting of many small resonators made of silicone rubber stub and metal weights has been proposed. However, there was still room for improvement of the sound damping and sound insulation performance by considering the mutual influence with the object to be damped, and by considering it as a dynamic absorber. In this study, a dynamic absorber was designed and fabricated in accordance with the optimal tuning condition, which is one of the conditions in the H_∞ optimization of the mobility transfer function for the vibration mode of a cantilever beam. The dynamic absorber was installed symmetrically on a beam with both ends free, and the center of the beam was vibrated to confirm that the anti-resonance peak of the mechanical impedance was damped by the dynamic absorber. However, since the damping component of the silicone rubber was not adjusted in this paper, the damping component was insufficient for the optimum damping condition, and the response of the low-frequency side of the peak divided by the dynamic absorber was large. In addition, the natural frequency of the dynamic absorber itself tends to be higher than in the simulation, which is thought to be caused by the inclusion of bubbles in the silicone rubber.