| 磁流变阻尼器的两种力学模型和试验验证 |
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| 引用本文： | 周强,瞿伟廉.磁流变阻尼器的两种力学模型和试验验证[J].地震工程与工程振动,2002,22(4):144-150. |
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| 作者姓名： | 周强 瞿伟廉 |
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| 作者单位： | 武汉理工大学土木工程与建筑学院,湖北,武汉,430070 |
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| 基金项目： | 国家自然科学基金资助项目 (5 0 0 3 80 10、5 99780 3 7) |
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| 摘 要： | 本文根据我们设计制作出的磁流变阻尼器的阻尼特性试验结果，提出了描述阻尼器动态特性的两种新的力学模型。一种称之为修正的Bingham模型，它由Bingham单元（库仑摩擦单元与粘滞单元并联）与弹簧单元串联组成。该弹簧单元与磁流变液屈服前区的初始剪切模量和蓄能器的刚度等有关。另一种称为修正的Dahl模型，它采用Dahl模型来模拟库仑摩擦力，克服了常用的Bouc-Wen模型需要确定的参数过多的缺点。为了使模型在阻尼器的电流强度（磁场强度）改变的情况下仍然有效，引入一个内变量描述模型参数与电流强度（磁场强度）的关系。最后，通过理论分析与试验结果的比较，证明本文提出的两种力学模型能够较为精确地描述大多数的磁流变阻尼器在改变电流强度（磁场强度）情况下的动态特性。
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| 关 键 词： | 磁流变阻尼器 力学模型 Bingham模型 Dahl模型 结构振动控制 |
| 文章编号： | 1000-1301(2002)04-0144-07 |
Two mechanic models for magnetorheological damper and corresponding test verification |
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| ZHOU Qiang,QU Wei lian.Two mechanic models for magnetorheological damper and corresponding test verification[J].Earthquake Engineering and Engineering Vibration,2002,22(4):144-150. |
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| Authors: | ZHOU Qiang QU Wei lian |
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| Abstract: | In this paper two mechanic models are proposed to describe the dynamic performance of magnetorheological (MR) damper according to the experiment results. One is the modified Bingham model which consists of Bingham model (a frictional element in parallel with a dashpot) in series with a spring element. The spring element stiffness is related to pre yield shear modulus of MR fluid and accumulator stiffness. The other is the modified Dahl model that adopts Dahl model instead of Bouc Wen model to simulate Coulomb friction force to avoid the determination of too many parameters. To make the proposed model valid under fluctuating current or magnetic field, an intrinsic variable is introduced to determine the function dependence of the parameters on the input current. By comparison between numerical and experimental results, the proposed two mechanic models are proved to be accurate enough to portray the dynamic performance of most MR dampers under fluctuating current or magnetic field. |
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| Keywords: | MR damper Mechanic model Modified Bingham model Modified Dahl model |
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