MR-J型磁流变阻尼器性能测试与阻尼力预估模型
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摘要
磁流变阻尼器阻尼力预估模型易受磁流变液磁感应强度-剪切屈服强度(B-τ)曲线精度及磁芯饱和效应的影响,导致阻尼器的预估阻尼力与实际阻尼力有较大偏差.针对上述问题,设计并制作了2个磁芯可更换的MR-J型磁流变阻尼器,通过对阻尼器的磁场分布和动力性能的测试,研究了磁芯面积、活塞节段数及磁场分布对阻尼器力学性能的影响;结合实测结果与有限元分析结果,提出了B-τ曲线的实用识别方法,建立了考虑磁芯饱和效应的阻尼力预估模型.研究表明:磁流变阻尼器的磁场分布和阻尼力随磁动势上升存在明显的磁芯饱和效应,且阻尼器的饱和磁动势随磁芯面积增大而增大;所提出的磁流变液B-τ曲线实用识别方法能正确描述阻尼器实际工作状态下磁流变液的性能参数;所提出的阻尼力预估模型能较为精确地预估磁流变阻尼器的实际阻尼力.
Affected by the accuracy of the magnetic induction intensity B and shearing yield strength τ curve and the magnetic saturation phenomenon,the accuracy of the traditional model for predicting damping force is not satisfactory and the predicted damping force is different from the actual damping force.In order to solve this problem,2 MR dampers with changeable magnetic core were designed and produced,and the influence of area of magnetic core,number of stages of the piston and magnetic field distribution on the mechanical properties of the MR dampers was studied through magnetic field test and dynamic test.An algorithm of practical B-τ curve was proposed based on test results and finite element analysis and a refined prediction model of damping force was put forward in which the effect of magnetic saturation phenomenon was put into consideration.Study results show that there is obviously magnetic saturation effect with the magnetic field distribution and the damping force,and the saturation magnetic motive force rises with the increase of the area of magnetic core.The proposed algorithm of practical B-τ curve can precisely describe the behavior of MR fluid in the actual working state.The proposed prediction model can predict the actual damping force of the MR dampers precisely.
Affected by the accuracy of the magnetic induction intensity B and shearing yield strength τ curve and the magnetic saturation phenomenon,the accuracy of the traditional model for predicting damping force is not satisfactory and the predicted damping force is different from the actual damping force.In order to solve this problem,2 MR dampers with changeable magnetic core were designed and produced,and the influence of area of magnetic core,number of stages of the piston and magnetic field distribution on the mechanical properties of the MR dampers was studied through magnetic field test and dynamic test.An algorithm of practical B-τ curve was proposed based on test results and finite element analysis and a refined prediction model of damping force was put forward in which the effect of magnetic saturation phenomenon was put into consideration.Study results show that there is obviously magnetic saturation effect with the magnetic field distribution and the damping force,and the saturation magnetic motive force rises with the increase of the area of magnetic core.The proposed algorithm of practical B-τ curve can precisely describe the behavior of MR fluid in the actual working state.The proposed prediction model can predict the actual damping force of the MR dampers precisely.
引文
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[8]Li Zhongxian,Xu Longhe.Performance tests and hys-teresis model of MRF-04K damper[J].Journal of Struc-tural Engineering,ASCE,2005,131(8):1303-1306.
[9]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.Zhou Qiang,Qu Weilian.Two mechanic models for mag-netorheological damper and corresponding test verifica-tion[J].Earthquake Engineering and Engineering Vibra-tion,2002,22(4):144-150(in Chinese).
[10]方子帆,邓兆祥.磁流变阻尼器简化力学模型研究[J].工程力学,2007,24(11):32-35,46.Fang Zifan,Deng Zhaoxiang.Study on simplified me-chanical model of magnetorheological damper[J].Engi-neering Mechanics,2007,24(11):32-35,46(in Chi-nese).
[11]李秀领,李宏男.磁流变阻尼器的双sigmoid模型及试验验证[J].振动工程学报,2006,19(2):168-172.Li Xiuling,Li Hongnan.Double-sigmoid model for mag-netorheological damper and corresponding experiment verification[J].Journal of Vibration Engineering,2006,19(2):168-172(in Chinese).
[2]Yang G,Spencer B F,Carlson J D,et al.Large-scale MR fluid dampers:Modeling and dynamic performance con-siderations[J].Engineering Structures,2002,24(3):309-323.
[3]Yang G.Large-Scale Magnetorheological Fluid Damper for Vibration Mitigation:Modeling,Testing and Control[D].Indiana:University of Notre Dame,2001.
[4]Dyke S J,Spencer B F,Sain M K,et al.An experimental study of magnetorheological dampers for seismic protec-tion[J].Smart Mater Struct,1998,7:693-703.
[5]欧进萍,关新春.磁流变耗能器及其性能[J].地震工程与工程振动,1998,18(3):74-81.Ou Jinping,Guan Xinchun.Magnetorheological fluid dampers and their properties[J].Earthquake Engineering and Engineering Vibration,1998,18(3):74-81(in Chi-nese).
[6]瞿伟廉,樊友川.磁流变液阻尼器的磁路有限元分析与优化设计方法[J].华中科技大学学报:城市科学版,2006,23(3):1-4.Qu Weilian,Fan Youchuan.Magnetic circuit finite ele-ment analysis and optimum design method of an MR damper[J].J of HUST:Urban Science Edition,2006,23(3):1-4(in Chinese).
[7]李忠献,吴林林,徐龙河,等.磁流变阻尼器的构造设计及其阻尼力性能的试验研究[J].地震工程与工程振动,2003,23(1):128-132.Li Zhongxian,Wu Linlin,Xu Longhe,et al.Structural design of MR damper and experimental study for per-formance of damping force[J].Earthquake Engineering and Engineering Vibration,2003,23(1):128-132(in Chinese).
[8]Li Zhongxian,Xu Longhe.Performance tests and hys-teresis model of MRF-04K damper[J].Journal of Struc-tural Engineering,ASCE,2005,131(8):1303-1306.
[9]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.Zhou Qiang,Qu Weilian.Two mechanic models for mag-netorheological damper and corresponding test verifica-tion[J].Earthquake Engineering and Engineering Vibra-tion,2002,22(4):144-150(in Chinese).
[10]方子帆,邓兆祥.磁流变阻尼器简化力学模型研究[J].工程力学,2007,24(11):32-35,46.Fang Zifan,Deng Zhaoxiang.Study on simplified me-chanical model of magnetorheological damper[J].Engi-neering Mechanics,2007,24(11):32-35,46(in Chi-nese).
[11]李秀领,李宏男.磁流变阻尼器的双sigmoid模型及试验验证[J].振动工程学报,2006,19(2):168-172.Li Xiuling,Li Hongnan.Double-sigmoid model for mag-netorheological damper and corresponding experiment verification[J].Journal of Vibration Engineering,2006,19(2):168-172(in Chinese).
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