Vibration suppression by mistuning acoustic black hole dynamic vibration absorbers

This paper presents a modified add-on strategy to reduce the transverse vibration of beam structures using multiple acoustic black hole dynamic vibration absorbers (ABH-DVAs). The exact dynamic stiffness formulation of the system constituted by the host beam and arrays of ABH-DVAs is established. The intentional mistuning effect is introduced into the system by varying the taper lengths of ABH-DVAs, aiming at broadband vibration suppression. Several case studies are presented to demonstrate the effectiveness of the proposed strategy. In addition, the multi-objective optimization of the structure with minimum weight and broad attenuation band is investigated. From the numerical and experimental results, it is seen that the attenuation bandwidth of the proposed design is widened compared with that of the conventional design. The proposed strategy shows great potential for widening the attenuation band of the acoustic black hole structures.