非均匀磁场作用下磁流变弹性体悬臂夹层梁振动响应实验分析（英文）
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摘要
制备了两根中间层为磁流变弹性体材料、上下表面层是铝合金的磁流变弹性体夹层梁,其中中间层磁流变弹性体材料中的铁磁颗粒、硅油和硅胶质量分数为7∶1∶2和7∶1.5∶1.5。搭建了振动实验台研究分析非均匀磁场作用下磁流变弹性体悬臂夹层梁的振动响应,其中外加磁场场强大小的变化通过改变永久磁铁间的垂直距离获得。实验结果表明:无论是沿着夹层梁水平方向从固定端向自由端移动,还是在特定位置改变外加磁场强度大小,夹层梁的一阶振动频率都有逐步减小的趋势;含有更高硅油比的弹性体夹层梁有着更好的减振效果。
In this study,two magnetorheological elastomers( MRE) were fabricated: the mixing ratios of carbonyl iron,silicon oil and silicone rubber are 7∶ 1∶ 2 and 7∶ 1. 5∶ 1. 5,respectively. And two MRE sandwich beams were also fabricated by treating MRE between two thin aluminum layers. The experiment test rig was set up to investigate the vibration response of MRE cantilever sandwich beams under non-homogeneous magnetic field,and different magnetic field intensity was adjusted by changing the distance between the permanent magnets. The experiment results show that the first natural frequency of the MRE cantilever sandwich beam gets decreased either when the magnets is moved away from the clamped end to the free end of beam or the external applied magnetic field gets increased at specific activated region. It is also observed the MRE sandwich beam with higher proportion of silicon oil has better vibration suppress ability.
In this study,two magnetorheological elastomers( MRE) were fabricated: the mixing ratios of carbonyl iron,silicon oil and silicone rubber are 7∶ 1∶ 2 and 7∶ 1. 5∶ 1. 5,respectively. And two MRE sandwich beams were also fabricated by treating MRE between two thin aluminum layers. The experiment test rig was set up to investigate the vibration response of MRE cantilever sandwich beams under non-homogeneous magnetic field,and different magnetic field intensity was adjusted by changing the distance between the permanent magnets. The experiment results show that the first natural frequency of the MRE cantilever sandwich beam gets decreased either when the magnets is moved away from the clamped end to the free end of beam or the external applied magnetic field gets increased at specific activated region. It is also observed the MRE sandwich beam with higher proportion of silicon oil has better vibration suppress ability.
引文
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[8]ESHAGHI M,EDAGHATI R,RAKHEJA S.Dynamic characteristics and control of magnetorheological/electrorheological sandwich structures:A state-of-the-art review[J].Journal of intelligent material systems and structures,2015(3):1-35.
[9]GONG X L,ZHANG X Z,ZHANG P Q.Fabrication and characterization of isotropic magnetorheological elastomers[J].Polymer Testing,2005,24(5):669-676.
[2]CARLSON J D,JOLLY M R.MR fluid,foam and elastomer devices[J].Mechatronics,2000,10(4/5):555-569.
[3]SHEN Y,GOLNARGHI M F,HEPPLER G R.Experimental Research and Modeling of Magnetorheological Elastomers[J].Journal of Intelligent Material Systems and Structures,2004,15(1):27-35.
[4]ISMAIL R,IBRAHIM A,HAMID H A.A review of magnetorheological elastomers:characterization properties for seismic protection[M].USA:Springer Singapore,2014:237-248.
[5]KIM Y K,BAE H I,KOO J H,et al.Note:real time control of a tunable vibration absorber based on magnetorheological elastomer for suppressing tonal vibrations[J].Review of Scientific Instruments,2012,83(4):55-57.
[6]FONG Y Z,SHIN S Y.Dynamic Characteristics and Dynamic Instability of Magnetorheological Material-based Adaptive Beams[J].Journal of Composite Materials,2006,40(15):1333-1359.
[7]ASHOUR O,ROGERS C A,KORDONSKY W.Magnetorheological fluids:materials,characterization,and devices[J].Journal of Intelligent Material Systems and Structures,1996,7(2):123-130.
[8]ESHAGHI M,EDAGHATI R,RAKHEJA S.Dynamic characteristics and control of magnetorheological/electrorheological sandwich structures:A state-of-the-art review[J].Journal of intelligent material systems and structures,2015(3):1-35.
[9]GONG X L,ZHANG X Z,ZHANG P Q.Fabrication and characterization of isotropic magnetorheological elastomers[J].Polymer Testing,2005,24(5):669-676.