Volume 19, Issue 4 (2019)                   Modares Mechanical Engineering 2019, 19(4): 991-1000 | Back to browse issues page

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Ghafarian Eidgahi Moghadam M, Shahmardan M, Norouzi M. Investigation of Magneto-Rheological Fluid Properties inside MR Damper by Use of Dissipative Particle Dynamics Method. Modares Mechanical Engineering. 2019; 19 (4) :991-1000
URL: http://journals.modares.ac.ir/article-15-21588-en.html
1- Heat & Fluid Department, Mechanical Engineering Faculty, Shahrood University of Technology, Shahrood, Iran
2- Heat & Fluid Department, Mechanical Engineering Faculty, Shahrood University of Technology, Shahrood, Iran , mmshahmardan@shahroodut.ac.ir
Abstract:   (649 Views)
Magneto-rheological damper is one of the most widely used mechanical equipment, which absorbs mechanical shocks by use of magnetic fluid and electrical coil in its structure. In this paper, for the first time, dissipative particle dynamics as a mesoscopic scale modeling method was used to simulate a magneto-rheological damper and its magnetic fluid. Data from 3 categories including magnetic fluids with brand names 122-EG, 132-DJ, and 140-CG have been used and effect of their physical properties on power of damping force have been investigated. Results of modeling show that by increasing shear rate of fluid, shear stress is first increased and, then, it is applied to a constant value, which results in a greater shear stress by applying a stronger magnetic field. It is also observed that, with increasing both maximum piston velocity and strength of magnetic field, maximum power of damping force increased, which in 140-CG is higher than the other fluids. Results of sensitivity analysis show that weight of magnetic particles and strength of dissipative forces have the greatest effect on damping force, in such a way that by increasing weight of magnetic particles and decreasing the dissipative force of particles, accumulation of magnetic particles decrease, so, increasing quality of damping. It was also found that 122-EG is more suitable than other types of magnetic fluids in forming standard magnetic particle chains, and provides a more favorable viscosity distribution for damping.
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Received: 2018/06/1 | Accepted: 2018/11/20 | Published: 2019/04/6

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