摘要
滚珠丝杠式轴向电涡流阻尼器(BS-ECD)是一种新的非线性速度型阻尼器。文章推导了BS-ECD的耗能计算公式及等效阻尼比,分析了BS-ECD的阻尼力速度曲线和滞回曲线特点,同时以位移放大系数、传递率和阻尼力峰值等为指标阐明了BS-ECD对承受简谐荷载激励的单自由度结构的减振效果,并与非线性黏滞阻尼器进行对比。结果表明:在阻尼器单位周期内耗能能力相同的条件下,BS-ECD的无量纲临界速度越小,对应的阻尼力速度曲线的非线性就越强,且存在最优的无量纲临界速度,使BS-ECD的峰值阻尼力最小;在共振等效阻尼比相同的设计原则下,无量纲临界速度为0.8的BS-ECD的减振效果和隔振效果比速度指数为0.3的非线性黏滞阻尼器更好。
The ball screw type eddy current damper(BS-ECD)is a novel velocity-based nonlinear.In this paper,the formula of energy dissipation and equivalent damping ratio of BS-ECD were derived at the first.Then,the characteristics of the damping force-velocity curve and hysteresis curve were analyzed,based on which the displacement magnification factor,the transmissibility,and the peak damping force were calculated to evaluate the BS-ECD’s control performance via a single-degree-of-freedom structure under harmonic excitations.Finally,the performances of BS-ECD were compared with those of the nonlinear fluid viscous damper(NFVD).The results indicate that the nonlinearity in the damping force-velocity curve becomes stronger as the BS-ECD’s critical velocity decreases,and an optimal critical velocity can be obtained to minimize the peak of the damping force under the condition in which the damper’s energy dissipation remains unchanged in each cycles.Under the design principle of the same equivalent resonant damping ratio,the BS-ECD with a dimensionless critical velocity of 0.8 performs better than NFVD with a velocity index of 0.3 in respect of the vibration reduction and isolation performance.
作者
肖潇
黄智文
陈政清
华旭刚
Xiao Xiao;Huang Zhiwen;Chen Zhengqing;Hua Xugang(Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;Vibration and Shock Technology Research Center,Hunan University,Changsha 410082,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2021年第12期64-73,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51808210)
湖南省自然科学基金(2020JJ5061)。
关键词
阻尼器
电涡流
等效阻尼比
振动控制
非线性
damper
eddy current
equivalent damping ratio
vibration control
nonlinear
