Design of a magnetorheological automotive shock absorber

Lindler, Jason E.; Dimock, Glen A.; Wereley, Norman M.

doi:10.1117/12.388845

Cited by 32 publications

(27 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal energy seeks to disperse the particles randomly within the carrier fluid while the gravitational energy tries to concentrate all particles towards the bottom of the container. thermal energy gravitational energy ≥ 1 (2) This is the condition to determine the maximum diameter of particles which will allow for suspension. Therefore…”

Section: Gravitational Energy = ∆ρV Glmentioning

confidence: 99%

<title>Magnetorheological fluids exploiting nanometer-sized particles</title>

John¹,

Yoo²,

Wereley³

et al. 2002

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

Magnetorheological(MR) fluids are suspensions of magnetic particles in a carrier fluid. The rheological properties of MR fluids undergo changes on application of magnetic field. MR fluids made using nanometer sized soft magnetic iron particles were studied for their benefits vis-a-vis flow characteristics and settling properties. Three kinds of MR fluids were synthesized using the microwave process (1) 30 µ m sized iron particles (2) 26.5 nm sized iron particle (3) a mixture of micron and nanometer sized iron particles . The fluids were suspensions of micron, nanometer as well as a mixture of nanometer and micron sized powders. Standard static and dynamic yield stress measurements were performed using a parallel disc oscillatory rheometer. The flow properties of these fluids were then characterized using the Bingham-Plastic, Eyring-Plastic and the Herschel-Buckley models. This paper investigates the rheological properties of these fluids and assesses their advantages and disadvantages. The pure micron powder yielded an MR fluid with highest yield stress, but had the most rapid settling. The nano sized powders overcame the problem of settling because of the predominance of thermodynamic forces at that scale, but they yielded a considerably lower yield stresses. A hybrid combination of micron and nano sized powders was an effective compromise to exploit the high yield stress provided by the micron powders and the self dispersing properties of the nano sized powders. We characterized these mixtures using existing rheological models. A key conclusion is that it may be possible to synthesise MR fluids with significant yield stress, while mitigating settling through the use of nanoscale powders.

show abstract

Section: Gravitational Energy = ∆ρV Glmentioning

confidence: 99%

<title>Magnetorheological fluids exploiting nanometer-sized particles</title>

John¹,

Yoo²,

Wereley³

et al. 2002

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…MR dampers have been applied in many mechanical systems, such as washing machines [4], automotive suspensions [5], prosthesis-knees [6], and bridge dampers [7]. Nevertheless, applications of MR dampers are habitually limited to high-end products.…”

Section: Introductionmentioning

confidence: 99%

“…In MR dampers, oil of conventional hydraulic dampers is replaced by a MR fluid [5]. Such specific fluids are magnetic particle suspensions in a carrier fluid [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological damper behaviour in accordance with flow mode

Berasategui

Gómez

Martinez‐Agirre

et al. 2018

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

The objective of this article is to determine the optimal flow mode in an MR damper to maximize its performance. Flow mode is one of the main design issues in an MR damper, as it determines the velocity profile and the pressure drop across the gap. In this research, two MR dampers were designed and manufactured with two flow modes: valve and mixed. The response of these two dampers was compared experimentally. Additionally, the experimental tests were correlated by theoretical results that were obtained considering the rheological behaviour of the MR fluid, the shear stress distribution in the gap, and the damper movement. Interestingly, the obtained results suggest that flow mode is not a significant parameter for determining the behaviour of a MR damper.

show abstract

“…MR fluid technology has been used in various engineering applications. MR dampers used in vibration damping control applications (Weiss et al 1998;Ginder et al 1996;Spencer et al 1997;Dyke et al 1998;Guo and Hu 2005;Boada et al 2011) are devices that work with MR Fluids and recently they are widely used in variety of fields such as automotive industry, military and agricultural trucks (Olabi and Grunwald 2007;Lindler et al 2000;Chooi and Oyadiji 2008;Ha et al 2009;Hiemenz et al 2009). It has also been widely used for the clutch, brake and locking systems in the automotive sector (Li and Du 2005;Park et al 2006;Senkal and Gürocak 2010;19-21).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

Gedik

2017

JAFM

View full text Add to dashboard Cite

An experimental and numerical study of Magnetorheological (MR) fluids flow in circular pipes under the influence of uniform magnetic field is considered. In the experiments, an electromagnetic device was manufactured to generate the magnetic field. The experiments were performed using magnetic fields B= 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12 and 0.15 T. Numerical study was performed to show the accuracy of the results obtained from experimental study. In numerical study, Computational Fluid Dynamics (CFD) analysis was used. The ANSYS Fluent 14.0 code based on the finite volume method was used for the CFD analysis. In the experiments, the applied magnetic field decreased the flow rate of the fluids by increasing viscosity. In case of 10 mm pipe diameter, the flow velocity of the A, B and C fluids were obtained as 0.593, 0.749 and 0.938 m/s respectively in situation B=0 T. When magnetic field was applied as B=0.15 T, decreases have occurred in the velocity of A, B and C fluids as 95.27%, 90.24% and 85.6% respectively. Similarly, in case of 15 mm pipe diameter, 96.87%, 95.06% and 90.76% decreases have occurred in the flow velocity of A, B and C fluids having 0.301, 0.363 and 0.445 m/s flow velocity respectively. The results were compared for the magnetic field values B=0, 0.05, 0.10 and 0.15 T. It was found that the differences between experimental and numerical study were found as 6.10% and 1.71% for the B=0 T and B≠0 T situations respectively when the pipe has 10 mm pipe diameter. In case of 15 mm pipe diameter, the differences were found as 2.31% and 0.89%. As a result, it was found that the results obtained from experimental and numerical study were qualitatively and quantitatively in good agreement.

show abstract

Design of a magnetorheological automotive shock absorber

Cited by 32 publications

References 4 publications

<title>Magnetorheological fluids exploiting nanometer-sized particles</title>

<title>Magnetorheological fluids exploiting nanometer-sized particles</title>

Magnetorheological damper behaviour in accordance with flow mode

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

Contact Info

Product

Resources

About