The effect of acoustic black hole (ABH) is to gradually reduce velocity of vibration wave in a plate by changing the plate structure’s thickness according to a specific law to realize energy gathering in a specific region. In recent years, ABH has been studied more in fields of controlling structural vibration and noise. Here, the plate structure with 2×2 acoustic black hole elements was taken as the study object, the trajectory model of bending wave propagation in the original plate’s equivalent 2D plate structure was established using the theory of ray acoustics. The focus position of bending wave caused by the acoustic black hole plate under different incident angles was explored. It was shown that when the minimum thickness of acoustic black hole element is not 0, the focus position of bending wave may not be at the geometric center of acoustic black hole element. Then, the vibration control of the plate with acoustic black hole elements was performed using multiple dynamic absorbers and their parameters were optimized adopting the numerical search technique. Furthermore, effects of dynamic vibration absorber (DVA) position on vibration reduction effect were studied. Through comparison, it was shown that dynamic vibration absorbers with optimized parameters can have very significant vibration reduction effect at their peaks and within a broadband range near their peaks.
Key words
acoustic black hole (ABH) /
ray acoustics /
dynamic vibration absorber (DVA) /
vibration control
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