Multiphysics modeling of magnetorheological dampers

Case, David A.; Taheri, Behzad; Richer, Edmond

doi:10.1260/1750-9548.7.1.61

Cited by 29 publications

(39 citation statements)

References 17 publications

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“…Thus, a steadystate solution of the magnetic field distribution has been determined. According to [19], the governing equations of the solver employed in COMSOL/Multi-physics are Maxwell's equation and Ampere's law, given, respectively, by:…”

Section: B the Fe Modelling Of The Damper Magnetic Circuitmentioning

confidence: 99%

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

2020

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A novel design of a magnetorheological (MR) damper is developed, fabricated, modelled and tested. The design includes some features that enhance the magnetic characteristics of the damper. The iron-cobalt-vanadium "Vacoflux-50" alloy and the "AMT-Smartec + " MR fluid, whose magnetic characteristics have been predicted to enhance the performance of the damper, are employed in the new design. Moreover, the location of the MR fluid region in the piston construction has been chosen so that the magnetic field maximises. To evaluate the impact of the proposed design improvements, an approach to modelling the performance of a previously-tested MR damper of a different design, different magnetic material, and different MR fluid has been developed. The approach combines a Finite Element Analysis (FEA) of the magnetic circuit, and a nonlinear analytical model of fluid flow. The results of the FE/analytical approach have been validated using the available published results of the same damper. Hence, the approach has been used to predict the performance of the same damper due to the employment of the proposed design improvements. The FE/analytical approach accounts for the nonlinear characteristics caused by the magnetic saturation of materials and the effects of fluid compressibility and aeration in the damper. It has been found that the implementation of the proposed design features leads to a remarkable increase in the magnetic field and the fluid yield stress. Also, the inclusion of the nonlinear magnetic and fluid flow characteristics have been found to affect the magnetic field distribution and the fluid yield stress greatly.

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Section: B the Fe Modelling Of The Damper Magnetic Circuitmentioning

confidence: 99%

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

2020

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“…Recently, Zheng et al [22] established a more sophisticated multiphysics model which considered the magnetic, temperature, and flow fields, respectively, by the inverse Jiles-Atherton hysteresis model, conjugate heat transfer equations, and Navier-Stokes equations. With the piston movements described by a deformed mesh, Case et al [30] developed a multiphysics finite element model for a small scale MR damper, and the coupling of the magnetic field with the flow field was achieved through a modified Bingham plastic material model which relates the fluid's dynamic viscosity to the intensity of the induced magnetic field. A similar work was conducted by Sternberg et al [31] which couples a threedimensional (3D) magnetostatic analysis with the flow analysis by using a bilinear Newtonian fluid with a fielddependent dynamic viscosity.…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional CFD Modeling of Hysteresis Behavior of MR Dampers

Guo

Xie

2019

Shock and Vibration

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So far, most previous studies on the nonlinear hysteresis analysis of ER/MR dampers have been limited to one-dimensional modeling techniques. A two-dimensional (2D) axisymmetric CFD model of MR dampers is developed in this work. The main advantage of the proposed 2D model of MR dampers lies in that it can be used to predict dynamic behavior of MR devices of arbitrary geometries. The compressibility of MR fluids is the main factor responsible for the hysteresis behavior of MR dampers, and it has been rarely investigated in previous multidimensional modeling of MR damper. In our model, the compressibility of MR fluids is taken into account by the two-dimensional constitutive model which is extended from a previous one-dimensional physical model. The model is solved by using the finite element method, and the movement of the piston is described by the moving mesh technique. The MR damper in a reference is simulated, and the model predictions show good agreement with the experimental data in the reference.

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“…The model was validated by comparing with the experimental data, and was used to optimize the configuration of the electrodes to improve the ER-effect. With the piston movements described by a deformed mesh, Case et al (2016) developed a multiphysics finite element model for a small scale MR damper. The model was concluded to be suitable for the prediction of oscillatory MR fluid behavior and thus for further development and optimization of the semi-active dampers.…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Axisymmetric Finite Element Analysis of Coupled Inertial-Viscous-Frictional-Elastic Transients in Magnetorheological Dampers Using the Compressible Herschel-Bulkley Fluid Model

et al. 2019

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It has been challenging to accurately predict the unique characteristics of magnetorheological (MR) dampers, due to their inherent non-linear nature. Multidimensional flow simulation has received increasing attentions because it serves as a general methodology for modeling arbitrary MR devices. However, the compressibility of MR fluid which greatly affects the hysteretic behavior of an MR damper is neglected in previous multidimensional flow studies. This paper presents a two-dimensional (2D) axisymmetric flow of the compressible Herschel-Bulkley fluid in MR dampers. We simulated the fully coupled inertial-viscous-frictional-elastic transients in MR dampers under low-, medium-, and high frequency excitations. An arbitrary Lagrangian-Eulerian kinematical description is adopted, with the piston movements represented by the moving boundaries. The viscoplasticity and compressibility of MR fluid are, respectively, modeled by the modified Herschel-Bulkley model and the Tait equation. The streamline-upwind Petrov-Galerkin finite element method is used to solve the model equations including the conservation laws and mesh motion equation. We tested the performances of an MR damper under different electric currents and different frequency displacement excitations, and the model predictions agree well with the experimental data. Results showed that the coupled transients of an MR damper are frequency dependent. The weak compressibility of MR fluid, which mainly happens in the chamber rather than in the working gap, is crucial for accurate predictions. A damper's transition from the pre-yield to the post-yield is essentially a step-response of a second order mass-spring-viscous system, and we give such step-response a detailed explanation in terms of mass flow rate.

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Multiphysics modeling of magnetorheological dampers

Cited by 29 publications

References 17 publications

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

Two‐Dimensional CFD Modeling of Hysteresis Behavior of MR Dampers

A Two-Dimensional Axisymmetric Finite Element Analysis of Coupled Inertial-Viscous-Frictional-Elastic Transients in Magnetorheological Dampers Using the Compressible Herschel-Bulkley Fluid Model

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