Study on broadband vibration reduction characteristics and optimal design of the acoustic black hole plate with damping oscillators.

Abstract

The acoustic black hole (ABH) can alter the velocity of bending waves and concentrate vibration energy with the change of thickness. However, the frequency of the ABH is primarily concentrated above the cut-off frequency and the effect on frequencies below the cut-off frequency is negligible. This paper investigates the vibration characteristics of the ABH damping oscillator (ABH-DO) structure in the frequency range below the cut-off frequency and the corresponding structural parameter influence analysis is conducted. Subsequently, the vibration property of ABH-DO in multiple array configurations are analyzed and the ability of absorbing the vibration energy is experimentally verified. Finally, orthogonal experiments are performed on ABH-DO structures in multiple array configurations. The results reveal that both single and multiple ABH-DO structures demonstrate effective vibration reduction. Among the parameters of ABH-DO, the oscillator mass has the most pronounced effect on vibration peaks. The vibration characteristics of the ABH-DO structure can be optimized by adjusting the oscillator mass. Optimal parameters are determined within a given range through orthogonal experiments. The vibration characteristics of the ABH-DO structure at the optimal factor level are enhanced to varying extents.