Design of low-frequency circular metastructure isolators with high-load-bearing capacity  

作　　者：Ning CHEN Zhichun YANG Te YANG Yizhou SHEN Wei TIAN Yanlong XU 

机构地区：[1]School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China [2]National Key Laboratory of Strength and Structural Integrity,Xi’an 710065,China [3]State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi’an 710049,China

出　　处：《Chinese Journal of Aeronautics》2024年第10期207-220,共14页中国航空学报（英文版）

基　　金：Supported by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University,China(No.CX2024001);National Natural Science Foundation of China(Nos.11972296,12372157);Aeronautical Science Foundation of China(No.20220057053001);Open Project of State Key Laboratory for Strength and Vibration of Mechanical Structures of Xi’an Jiaotong University,China(No.SV2023-KF-19).

摘　　要：Traditional vibration isolation structures cannot work effectively for low-frequency vibration under heavy loads,due to the inherent contradiction between the high-static and lowdynamic stiffness of these structures.Although the challenge can be effectively addressed by introducing a negative stiffness mechanism,the existing structures inevitably have complex configurations.Metastructures,a class of man-made structures with both extraordinary mechanical properties and simple configurations,provide a new insight for low-frequency vibration isolation technology.In this paper,circular metastructure isolators consisting of some simple beams are designed for low-frequency vibration,including a single-layer isolator and a double-layer isolator,and their static and dynamic characteristics are studied,respectively.For the static characteristic,the force–displacement and stiffness–displacement curves are obtained by finite element simulation;for the dynamic characteristic,the vibration transmissibility curves are obtained analytically and numerically.The result shows that the circular nonlinear single-layer isolator has excellent lowfrequency isolation performance,and the isolation frequency band will decrease about 20 Hz when the isolated mass is fixed at 1.535 kg,compared with a similar circular linear isolator.These static and dynamic properties are well verified through experiments.Our work provides an innovative approach for the low-frequency vibration isolation and has wide potential applications in aeronautics.

关 键 词：ISOLATOR LOW-FREQUENCY Curved beam Metastructure STIFFNESS 

分 类 号：V214[航空宇航科学与技术—航空宇航推进理论与工程]