Analysis, optimization and control of an adaptive tuned vibration absorber featuring magnetoactive materials

IF 2.1 3区 工程技术 Q2 ENGINEERING, CIVIL
F. Lin, M. Hemmatian, R. Sedaghati, Farhad Aghili
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引用次数: 0

Abstract

Excessive vibration may cause premature fatigue failure on structural components if it is not properly controlled. One effective way to attenuate vibration is to attach a tuned vibration absorber to the main structural component. Passive tuned vibration absorbers are mainly effective to attenuate vibration at a specific range of frequencies and thus they become infective under varied environmental conditions which can significantly alter the tuning frequencies. The present study aims at development of a wide-bandwidth and light-weight adaptive tuned vibration absorber (ATVA) featuring a magnetorheological elastomer (MRE) which is tuned to absorb the vibrations of a flexible beam. The accelerance transfer function is derived for both beam with and without ATVA. The effectiveness of the ATVA to control vibration of the flexible beam caused by external excitation under wide range of frequencies is demonstrated. The proposed ATVA consists of C-Shape frame with winding coils, two isometric MRE specimens with 40% volume fraction, and active mass. An empirical model for the MRE has been developed through an experimental identification method in order to predict the MRE's elastic modulus under various levels of excitation frequencies and applied magnetic fields. Using MRE models and magneto-circuit analysis, the frequency bandwidth of the ATVA is analytically obtained. The analytical model is then used to develop a multidisciplinary design optimization formulation to minimize the mass and maximize the frequency bandwidth of an ATVA featuring MRE given several geometrical and physical constraints. Finally, a tuning algorithm has been presented to determine the required applied magnetic flux density to the MRE layers based on the identified phase difference between the absolute acceleration of the host and relative acceleration of the host and ATVA's resonator.
磁活性材料自适应调谐减振器的分析、优化与控制
如果控制不当,过度振动可能会导致结构部件过早疲劳失效。衰减振动的一种有效方法是将调谐减振器连接到主要结构部件上。被动调谐减振器主要有效地衰减特定频率范围内的振动,因此它们在可显著改变调谐频率的各种环境条件下变得具有感染力。本研究旨在开发一种宽带宽、重量轻的自适应调谐减振器(ATVA),该减振器具有磁流变弹性体(MRE),可调谐以吸收柔性梁的振动。导出了有和无ATVA的光束的加速传递函数。证明了ATVA在宽频率范围内控制外部激励引起的柔性梁振动的有效性。所提出的ATVA由带绕组的C形框架、两个体积分数为40%的等距MRE试样和有效质量组成。通过实验识别方法建立了MRE的经验模型,以预测MRE在不同激励频率和外加磁场水平下的弹性模量。利用MRE模型和磁路分析,解析地获得了ATVA的频带宽度。然后,在给定几个几何和物理约束的情况下,该分析模型被用于开发多学科设计优化公式,以最小化具有MRE的ATVA的质量并最大化其带宽。最后,提出了一种调谐算法,以基于所识别的主机的绝对加速度与主机和ATVA谐振器的相对加速度之间的相位差来确定所需的施加到MRE层的磁通密度。
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来源期刊
Smart Structures and Systems
Smart Structures and Systems 工程技术-工程:机械
CiteScore
6.50
自引率
8.60%
发文量
0
审稿时长
9 months
期刊介绍: An International Journal of Mechatronics, Sensors, Monitoring, Control, Diagnosis, and Management airns at providing a major publication channel for researchers in the general area of smart structures and systems. Typical subjects considered by the journal include: Sensors/Actuators(Materials/devices/ informatics/networking) Structural Health Monitoring and Control Diagnosis/Prognosis Life Cycle Engineering(planning/design/ maintenance/renewal) and related areas.
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