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A magnetorheological vibration absorber with bidirectional tunability for pipelines

动力减振器 振动 激发 磁场 磁流变弹性体 磁流变液 材料科学 固有频率 加速度 声学 传递率(结构动力学) 管道(软件) 电气工程 物理 工程类 隔振 机械工程 经典力学 量子力学
作者
Yuanpeng Xie,Jie Fu,Zhu Mi,Song Qi,Ruixue Tian,Miao Yu
出处
期刊:Smart Materials and Structures [IOP Publishing]
卷期号:32 (12): 125007-125007 被引量:3
标识
DOI:10.1088/1361-665x/ad00f2
摘要

Abstract A magnetorheological elastomer (MRE) is employed as a tunable stiffness element in a dynamic vibration absorber (DVA) due to its remarkable magnetic tunability. However, the natural frequency of the MRE-based DVA can only be tuned towards high frequency under magnetic fields, which fails to solve, or even exacerbates, the low-frequency pipeline vibration. To tackle this issue, an innovative DVA (H-DVA) with bidirectional magnetic tunability is proposed in this paper. The hard magnetic MRE filled by NdFeB particles is selected as the core tunable stiffness element in H-DVA. Besides, the discretization distribution design scheme for the mass oscillators is adopted to improve the flexibility of H-DVA. Then, the magnetic field simulation and resonance frequency shifting test of H-DVA under different magnetic fields are completed to validate the bidirectional magnetic tunability. Lastly, the vibration absorption effect is verified in a self-established experimental pipeline system. The experiment results demonstrate that the resonance frequency of the proposed H-DVA exhibites a maximum frequency shift of approximately −2.7 Hz under reversed magnetic field. Compared to H-DVA working in zero field state, the acceleration magnitude of the pipeline vibration is further reduced by 8.8% when applying −1.5 A to the H-DVA under 55 Hz excitation. Similarly, the acceleration magnitude is further reduced by 22.2% when applying 2 A to the H-DVA under 85 Hz excitation. Thus, these findings confirm that the H-DVA proposed in this paper not only achieves the bidirectional magnetic tunability, but also improves the vibration absorption effect for pipeline vibration.

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