432 / 2022-08-04 22:17:20

Impact Vibration Properties of the Nonlinear Acoustic Metamaterial Cantilever Beam

Cantilever beam,Nonlinear acoustic metamaterial,Band structure,Impact vibration control

Noise and vibration control

The cantilever beam structure is widely used in many engineering structures, and is susceptible to strong impact loads such as explosions and collisions in the process of working, which intensify the vibration of the cantilever beam structure and have a serious impact on its safety and stability. Therefore, it is urgent and meaningful to suppress the impact vibration of the cantilever beam structure. In this paper, a nonlinear acoustic metamaterial beam structure with local resonance structure is proposed mainly based on the acoustic metamaterial theory, and the vibration characteristics of the acoustic metamaterial cantilever beam are studied in detail. The finite element method (FEM) is combined with the harmonic balance method (HBM) to calculate the band structures of the linear and nonlinear acoustic metamaterial beams with infinite structures, and the impact vibration properties of the finite structure acoustic metamaterial beams are simulated. The results show that both linear and non-linear acoustic metamaterial beams have better impact vibration suppression, but the impact vibration suppression effect of nonlinear acoustic metamaterial beam is significantly better than that of the linear. The research results provide a technical reference for the impact vibration control of cantilever beams in various engineering equipment.