Dynamics Analysis of the MRF Rectangular Sandwich Plate Based on ANSYS
Magnetorheological fluid (MRF) is in liquid when there are no external stimuli. However, when they are subjected to an applied magnetic field, their physical appearance changes from viscoelastic body to viscoelastic plastic body and eventually becomes lik
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Dynamics Analysis of the MRF Rectangular Sandwich Plate Based on ANSYS ZhengXin Zhang and FangLin Huang
Abstract Magnetorheological fluid (MRF) is in liquid when there are no external stimuli. However, when they are subjected to an applied magnetic field, their physical appearance changes from viscoelastic body to viscoelastic plastic body and eventually becomes like a solid gel. During this transformation, the vibration characteristics of the MRF rectangular sandwich plates change as well. For the simple MRF rectangular sandwich structure, the natural frequency and loss factor can be obtained by theoretical derivation method. The large complex MRF sandwich structure is difficult to deal with, and the experimental study has great effect on the experimental conditions. What is more, the experiment load condition is also very limited, so the use of the finite element analysis software to simulation is necessary. In this paper, a theoretical calculation method of MRF rectangular sandwich plate simply supported on four edges has been proposed to calculate natural frequency. Based on the ANSYS, this paper proposes several methods to simulate MRF rectangular sandwich plate and obtains the best modular model by comparing with the theoretical result. Keywords Magnetorheological fluid Viscosity Natural frequency
ANSYS
Complex shear modulus
Z. Zhang (&) F. Huang School of Civil Engineering, Central South University, Changsha 410075, China e-mail: [email protected]
Y. Yang and M. Ma (eds.), Proceedings of the 2nd International Conference on Green Communications and Networks 2012 (GCN 2012): Volume 4, Lecture Notes in Electrical Engineering 226, DOI: 10.1007/978-3-642-35440-3_84, Ó Springer-Verlag Berlin Heidelberg 2013
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Z Zhang and F Huang
84.1 Introduction Magnetorheological fluid (MRF) is in liquid form, with low viscosity, when there are no external stimuli. However, when they are subjected to an applied magnetic field, their physical appearance changes to a solid gel. During this transformation, their rheological properties, such as apparent viscosity and complex shear modulus, change significantly [1, 2]. Under external magnetic field, MRF exhibits a certain shear yield stress, which is considered to be the main sign of MR effect [3]. Using this characteristic, MRF sandwich beams, plates and shells have been developed for improving the damping and stiffness of structure. At present, there are not many researches in analyzing dynamic characteristics of MRF sandwich with finite element method at home and abroad. Li et al. [4] adopted finite element method to deduce natural frequency and loss factor of MRF sandwich plate under different magnetic field intensity. Snamina et al. [5] studied on the vibration characteristics of MRF sandwich plate and applied research results in continuous system’s semi-active control. For simple MRF sandwich beams and plates, their natural frequency and loss factor could be calculated by the theoretical deduction. However, large and complex MRF sandwich structures w
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