119 / 2021-03-30 23:53:21

An Optimal Designing of Vibration Absorber Based on Two-dimensional Acoustic Black Holes

Acoustic Black Hole,Slotted,Coupling coefficient,Vibration absorber

Acoustic Black Hole Dynamic Vibration Absorber (ABH-DVA), as a vibration controller based on acoustic black hole, has broad application prospects in the vibration control of various equipment. However, the traditional ABH-DVA, which is symmetrical, has fewer coupling modes with the controlled object, and has limited control effects. Therefore, this article is based on ABH-DVA, obtained the Slotted Acoustic Black Hole Dynamic Vibration Absorber (S-ABH-DVA) through slotting, and simulates its overall structure with a plate as the controlled object. The simulation results show that, compared with ABH-DVA, S-ABH-DVA can produce more abundant modes, has a wider frequency range and more effective damping effect. In order to further guide the vibration control, the coupling coefficient is used to characterize the coupling between the S-ABH-DVA and the controlled object. The dynamic interaction and damping effects, two factors that reduce the dynamic level of the system are analyzed, and the equivalent damping ratio of the structure is calculated. It provides certain theoretical guidance for the designing and engineering application of S-ABH-DVA in the future.