An Overview of Magneto- and Electro-Rheological Fluids and their Applications in Fluid Power Systems

Agrawal, Ashish; Kulkarni, Prashant S.; Vieira, S. L.; Naganathan, Nagi G.

doi:10.1080/14399776.2001.10781106

Cited by 19 publications

(7 citation statements)

References 45 publications

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“…where τ is the yield stress, γ e the deformation and G * the complex (or dynamic) shear modulus. The MR fluids post-yield behaviour has been mathematically described and experimentally observed on many works [40,48], anyway the most common model is the particle magnetization model [40,47] that considers the action of the particles as magnetic multi-domains [40,47,59]. In general, the solid particles dispersed in the fluid have a randomly aligned dipole moment if no magnetic field is applied.…”

Section: Mr Fluid Characteristicsmentioning

confidence: 99%

A Review on Parametric Dynamic Models of Magnetorheological Dampers and Their Characterization Methods

et al. 2018

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Magnetorheological (MR) fluids are capable of manifesting a rheological behaviour change by means of a magnetic field application and can be employed in many complex systems in many technical fields. One successful example is their use in the development of dampers: magnetorheological dampers (MRDs) are widespread in vibration control systems, as well as civil engineering applications (i.e., earthquake or seismic protection), impact absorption and vibration isolation technology in industrial engineering, and advanced prosthetics in biomedical fields. In the past, many studies have been conducted on MRDs modeling and characterization, but they have usually been focused more on the theoretical models than on the experimental issues. In this work, an overview of both of them is proposed. In particular, after an introduction to the physics of the magnetorheological effect, a short review of the main mathematical models of MRDs is proposed. Finally, in the second part of this study an overview of the main issues that occur in MRDs experimental characterization is reported and discussed.

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Section: Mr Fluid Characteristicsmentioning

confidence: 99%

A Review on Parametric Dynamic Models of Magnetorheological Dampers and Their Characterization Methods

et al. 2018

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“…An extension of the Bingham plastic model can describe the behavior of an ER or MR fluid subject to an electric or magnetic field, as shown in Table 3, row 3. Further information about ER and MR fluids and their applications can be found in [60]. Three approaches are possible to design a damping system based on variable-rheology fluids [61]: squeeze mode, shear mode, and valve mode.…”

Section: / ( ) F a H A Hmentioning

confidence: 99%

Damping in Compliant Actuation: A Review

Monteleone

Negrello

Catalano

et al. 2022

IEEE Robot. Automat. Mag.

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This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.C ompliant actuator technology aims at building robots capable of physically interacting with humans and the environment, matching the versatility and capacity of biological systems. Recently, it underwent a significant evolution with the introduction of damping to improve performance. Such development reflects several aspects, including energy saving and oscillation mitigation. However, large damping values tend to increase the system impedance, worsening robot resilience and human safety during impacts. That suggests the importance of a correct tradeoff.This article reviews the application of damping solutions to compliant actuation. We classify damper systems based on the amount of active control, their physical operation principle, and the topological position of the damping element used in the various actuators. Then we study the fields of application of these devices and analyze how different design aspects correlate with one another and applications. This analysis yields insight into how design choices can influence the characteristics of actuators and the robots using them, from the viewpoint of robot resilience, human safety, power consumption, and energy storage. Finally, we provide an annotated database of the papers considered to conduct this review. OverviewThe field of compliant robotic actuation has been growing [1],[2], motivated by the intention of building robots able to cope with unknown environments [3], behave safely in humanrobot interaction [4], tolerate shocks [5], store energy [6], [7], and move agilely on legs [8]- [10]. Nevertheless, when compared to rigid equivalent robots, compliant actuation underperforms in some domains. Among other aspects, reduced control authority bandwidth can lead to undesired oscillations and vibrations [11], which can, in turn, reduce precision, compromise stability, and waste energy. Through the years, it became clear that to mitigate such limitations [12], which can jeopardize the very advantage of using compliant actuation in the first place, the inclusion of some form of damping action [13] is mandatory.

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“…The apparent viscosity increases rapidly with increasing field strength. Several applications based on ERF have been developed (Agrawal et al, 2001) and electrorheological valves are one of them. ER valves consist of a capillary gap which is formed by two electrodes.…”

Section: Introductionmentioning

confidence: 99%

Design of Cylinder Drives Based on Electrorheological Fluids

Zaun

2006

International Journal of Fluid Power

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Short response times make electrorheological fluids (ERF) particularly suitable for the control of high dynamic applications. This paper deals with the usability of these controllable fluids and furthermore with the essential components to build up electrorheological cylinder drives. Hands-on experiences are explained in order to support the design of such systems. A design concept developed at IFAS has been applied to a new cylinder drive. The concept considers a total modularisation of the drive and the electrorheological valves. This paper demonstrates the advantages of this concept when using ERF.

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An Overview of Magneto- and Electro-Rheological Fluids and their Applications in Fluid Power Systems

Cited by 19 publications

References 45 publications

A Review on Parametric Dynamic Models of Magnetorheological Dampers and Their Characterization Methods

A Review on Parametric Dynamic Models of Magnetorheological Dampers and Their Characterization Methods

Damping in Compliant Actuation: A Review

Design of Cylinder Drives Based on Electrorheological Fluids

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