中国物理B ›› 2022, Vol. 31 ›› Issue (6): 64303-064303.doi: 10.1088/1674-1056/ac48fc
Miao Yu(于淼)1, Xin Fang(方鑫)1,2,†, Dianlong Yu(郁殿龙)1, Jihong Wen(温激鸿)1, and Li Cheng(成利)2
Miao Yu(于淼)1, Xin Fang(方鑫)1,2,†, Dianlong Yu(郁殿龙)1, Jihong Wen(温激鸿)1, and Li Cheng(成利)2
摘要: Nonlinear elastic metamaterial, a topic which has attracted extensive attention in recent years, can enable broadband vibration reduction under relatively large amplitude. The combination of damping and strong nonlinearity in metamaterials may entail extraordinary effects and offer the capability for low-frequency and broadband vibration reduction. However, there exists a clear lack of proper design methods as well as the deficiency in understanding properties arising from this concept. To tackle this problem, this paper numerically demonstrates that the nonlinear elastic metamaterials, consisting of sandwich damping layers and collision resonators, can generate very robust hyper-damping effect, conducive to efficient and broadband vibration suppression. The collision-enhanced hyper damping is persistently presented in a large parameter space, ranging from small to large amplitudes, and for small and large damping coefficients. The achieved robust effects greatly enlarge the application scope of nonlinear metamaterials. We report the design concept, properties and mechanisms of the hyper-damping and its effect on vibration transmission. This paper reveals new properties offered by nonlinear elastic metamaterials, and offers a robust method for achieving efficient low-frequency and broadband vibration suppression.
中图分类号: (Structural acoustics and vibration)