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Development of models of the electromechanical magnetorheological fluid damping device with account for mutual influence of physical fields

S.A. Nesterov

Vestnik IGEU, 2017 issue 3, pp. 48—53

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Abstract in English: 

Background: The magnetorheological fluid dampers with adjustable stiffness are currenty finding their practical applications but the problem of obtaining an adequate simplified calculation procedure for predicting the properties of magnetorheological fluid damping device is not fully resolved. The methods used now describe the magnetic fluid based on the Bingham model. The disadvantage of this approach is that it does not account for the flow curve magnetic fluid initial section, which leads to incorrect results at low rates of magnetic fluid flow in the damper gap. The disadvantage of the analytical models is that the equations refer to certain types of operating area design of the magnetorheological fluid damping device and it is impossible to reach the desired accuracy for the channels of complex shape. The aim of this work is to develop and improve the models of the electromechanical magnetorheological fluid damper taking into account the mutual influence of physical fields.

Materials and methods: The studies were based on the theories of magnetohydrodynamics, rheology of non-Newtonian fluids, electromagnetic field. We used interrelated finite-element modeling of electromagnetic, hydrodynamic and temperature fields of the electromechanical magnetic fluid damper.

Results: A new algorithm has been proposed for analytical calculation of the force-velocity relationship of magnetorheological (MR) dampers taking into account the rheological properties of the MR fluid that is nonlinearly dependent on shear flow rate and magnetic field parameters. The nonlinear magnetorheological fluid characteristics are divided into several areas with constant viscosities. A finite element model of the MR damper has been developed; it allows analyzing the MR damper with an account for the mutual influence of electromagnetic, hydrodynamic and thermal fields.

Conclusions: The proposed calculation models and algorithms of the electromechanical magnetorheological damper can be used to assess the stiffness, resistance and force generated by the damper devices with magnetorheological fluid. The approach based on splitting the magnetic fluid flow curve into two sections with different viscosities allows us to say that the obtained results are more real and less dependent on the value of the shear rate in the magnetorheological fluid damper gap. The results of the finite element simulation coincide with the analytical solutions, which allows using them for designing MR dampers.

Key words: magnetorheological fluid, electromechanical magnetorheological fluid damper, viscosity, force-velocity relationship, finite element model.

References in English: 

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Ключевые слова на русском языке: 
магнитная жидкость, электромеханический магнитожидкостный демпфер, вязкость, силовая характеристика, конечно-элементная модель
Ключевые слова на английском языке: 
magnetorheological fluid, electromechanical magnetorheological fluid damper, viscosity, force-velocity relationship, finite element model
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