Full-band vibration control of box-type structure with acoustic black hole

Abstract

As a new type of efficient wave control technology, the Acoustic Black Hole (ABH) technology is widely used in vibration control of beam and plate structures. However, the traditional acoustic black hole structures have many shortcomings, such as weak local strength and stiffness, large feature size, and high effective frequency, limiting the further application and promotion of acoustical black hole technology. A new type of Acoustic Black Hole Damping (ABHD) absorber is designed for the vibration control of box-type structure. In this paper, the finite element simulation method is used to study the dynamic characteristics of the box-type structure with ABHD absorber. The results show that it has high energy concentration and dissipation ability. By optimizing the design of ABHD absorber at different positions in the middle of upper and lower main beams, the vibration reduction effect of the full-band can be achieved without changing the strength and stiffness of the main structure. The experimental results show that full-band resonance peaks of the box-type structure with ABHD absorbers can be reduced by 5-30 dB, and the weight of ABHD absorbers accounts for 7.87% of the total weight of system. 声学黑洞（ABH）作为一种新型高效的波动控制技术，被广泛应用于梁板结构的振动控制中。传统声学黑洞结构存在局部强度和刚度较弱、特征尺寸较大、有效作用频率较高等问题，限制了声学黑洞技术的进一步应用和推广。针对盒式结构振动控制问题，设计了一种新型的声学黑洞阻尼（ABHD）振子。运用有限元仿真方法研究了附加ABHD振子的盒式结构的动态特性，结果表明附加声学黑洞阻尼振子的盒式结构具有高效的能量聚集和耗散能力。通过对盒式结构上下主梁中间不同位置处振子参数的优化，在不改变原有主结构强度和刚度的前提下，实现了对主梁全频带的减振效果。实验结果表明，传统盒式结构在附加多个ABHD振子后全频带的共振峰均有5~30 dB的削减，且附加振子的质量占系统总质量的7.8 %。