半主动涡流摆调谐变频阻尼质量阻尼器

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Liangkun Wang, Weixing Shi, Ying Zhou, Quanwu Zhang
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引用次数: 47

摘要

为了保护结构的全生命周期,本文提出了一种新型调谐质量阻尼器,即半主动涡流摆调谐质量阻尼器(SAEC-PTMD),它可以实时调整结构的频率和阻尼比。通过Hilbert-Huang变换(HHT)识别结构的瞬时频率,并通过基于HHT的控制算法对SAECPTMD摆进行调节。讨论了涡流阻尼参数,通过多项式函数拟合了有效阻尼系数与气隙之间的关系。基于线性二次高斯(LQG)控制算法的半主动涡流阻尼可通过调节气隙实现实时调节。为了验证SAEC-PTMD的振动控制效果,提出了一种理想的线性主结构,该结构具有谐波激励和近断层脉冲地震激励。在强震作用下,结构可能进入非线性状态,而Bouc-Wen模型在模拟结构的滞回特性方面有着广泛的应用。因此,在另一个案例研究中,提出了一种基于Bouc-Wen模型的非线性初级结构。采用最优被动TMD进行比较,并考虑了主结构累积损伤引起的失谐效应。以结构加速度和位移时程响应的最大值和均方根(RMS)值、结构加速度和位移响应谱作为评价指标。以一次地震激励的功率分析为例,进一步研究了SAECPTMD的耗能效果。结果表明,SAEC-PTMD在主结构损伤前后的性能均优于优化后的被动TMD。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Semi-active eddy current pendulum tuned mass damper with variable frequency and damping
In order to protect a structure over its full life cycle, a novel tuned mass damper (TMD), the so-called semi-active eddy current pendulum tuned mass damper (SAEC-PTMD), which can retune its frequency and damping ratio in real-time, is proposed in this study. The structural instantaneous frequency is identified through a Hilbert-Huang transformation (HHT), and the SAECPTMD pendulum is adjusted through an HHT-based control algorithm. The eddy current damping parameters are discussed, and the relationship between effective damping coefficients and air gaps is fitted through a polynomial function. The semi-active eddy current damping can be adjusted in real-time by adjusting the air gap based on the linear-quadratic-Gaussian (LQG)-based control algorithm. To verify the vibration control effect of the SAEC-PTMD, an idealized linear primary structure equipped with an SAECPTMD excited by harmonic excitations and near-fault pulse-like earthquake excitations is proposed as one of the two case studies. Under strong earthquakes, structures may go into the nonlinear state, while the Bouc-Wen model has a wild application in simulating the hysteretic characteristic. Therefore, in the other case study, a nonlinear primary structure based on the Bouc-Wen model is proposed. An optimal passive TMD is used for comparison and the detuning effect, which results from the cumulative damage to primary structures, is considered. The maximum and root-mean-square (RMS) values of structural acceleration and displacement time history response, structural acceleration, and displacement response spectra are used as evaluation indices. Power analyses for one earthquake excitation are presented as an example to further study the energy dissipation effect of an SAECPTMD. The results indicate that an SAEC-PTMD performs better than an optimized passive TMD, both before and after damage occurs to the primary structure.
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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