Low-frequency band gap vibration isolation of local-resonant metamaterial beam with curved-beam resonators
Jie Tang, Tielin Wang, Yinghui Li, Huagang Lin, Huatao Chen, Dengqing Cao
Abstract
This article proposes a metamaterial beam with curved beam resonators which are periodically attached. Each curved beam resonator consists of two inclined curved beams with initial deflection and an lumped mass. First, the static analysis of the curved beam resonator is conducted to obtain its stiffness. Then, the spectral element method (SEM) is employed to calculate the transmissibility of the metamaterial beams and compare it with numerical simulations. The results show that the proposed metamaterial beam can generate low-frequency band gaps, making it suitable for low-frequency vibration attenuation. Additionally, the effects of damping, lumped mass, and the number of resonators on the vibration transmissibility are investigated. Finally, sweeping frequency and fixed frequency experiments are carried out to verify the vibration isolation performance, and the experimental results align well with the theoretical analysis.