中国物理B ›› 2022, Vol. 31 ›› Issue (6): 64303-064303.doi: 10.1088/1674-1056/ac48fc

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Collision enhanced hyper-damping in nonlinear elastic metamaterial

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   

  1. 1 Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073, China;
    2 Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China
  • 收稿日期:2021-10-01 修回日期:2021-12-29 接受日期:2021-12-29 出版日期:2022-05-17 发布日期:2022-05-17
  • 通讯作者: Xin Fang E-mail:xinfangdr@sina.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11872371, 11991032, and 12002371) and the Science and Technology Innovation Program of Hunan Province, China (Grant No. 2020RC4022).

Collision enhanced hyper-damping in nonlinear elastic metamaterial

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   

  1. 1 Laboratory of Science and Technology on Integrated Logistics Support, National University of Defense Technology, Changsha 410073, China;
    2 Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China
  • Received:2021-10-01 Revised:2021-12-29 Accepted:2021-12-29 Online:2022-05-17 Published:2022-05-17
  • Contact: Xin Fang E-mail:xinfangdr@sina.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11872371, 11991032, and 12002371) and the Science and Technology Innovation Program of Hunan Province, China (Grant No. 2020RC4022).

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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.

关键词: nonlinear elastic metamaterial, hyper-damping, vibration suppression

Abstract: 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.

Key words: nonlinear elastic metamaterial, hyper-damping, vibration suppression

中图分类号:  (Structural acoustics and vibration)

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