带刚度调节的粘滞阻尼器磁场有限元分析.pdf

The 12th International Symposium on Structural Engineering THE THREE-DIMENSIONAL MAGNETIC FIELD FINITE ELEMENT ANALYSIS ON THE NEW VISCOELASTIC DAMPER WITH ADJUSTABLE STIFFNESS Long Huang, Jianwei Tu Hubei Key Laboratory of Roadway Bridge Structure Engineering, Wuhan University of Technology, Wuhan 430070, P.R.China Abstract: Magnetorheological elastomer is viewed as viscous-elastic material with adjustable shear stiffness, a new type of magnetorheological intellectual material. With intellectual adjustability of MR elastomer stiffness, a new viscoelastic damper with adjustable stiffness is designed to perform the three-dimensional finite element analysis on the magnetic field. Compared with two-dimensional finite element analysis, its result is more precise and practical with flux leakage of air layer considered. By establishing the magnetic field three-dimensional finite element model of the viscoelastic damper with adjustable stiffness, the relationship is obtained between magnetic induction intensity in the area of MR elastomers and the external magnetic field, and the distribution is perceived about magnetic induction intensity inside the area. On that basis, an analysis is conducted on the effect on magnetic induction intensity of the damper produced by the change of MR elastomers area and of the steel plate thickness, whose result underlies the design and optimization of the new viscoelastic damper with adjustable stiffness. Keywords: Magnetorheological (MR) elastomer, magnetic field analysis of three-dimensional finite element, adjustable stiffness, visoelastic damper 1 INTRODUCTION strong magnetic field (magnetic partic