A magnetorheological fluid based orthopedic active knee brace

Zite, Jamaal L.; Ahmadkhanlou, Farzad; Neelakantan, Vijay A.; Washington, Gregory

doi:10.1117/12.658693

Cited by 19 publications

(9 citation statements)

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“…MRF-based damper is used in human prosthetic legs. Figure 19 displays prosthetic leg with MRF damper, which decreases the shock delivered by the patient’s leg during jumping (Carlson et al, 2001; Kim and Oh, 2001; Xie et al, 2010; Zite et al, 2006). As a result, patient mobility and agility will be increased.…”

Section: Mrfmentioning

confidence: 99%

A state of art on magneto-rheological materials and their potential applications

Ahamed

Choi

Ferdaus

2018

Journal of Intelligent Material Systems and Structures

229

149

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Smart materials are kinds of designed materials whose properties are controllable with the application of external stimuli such as the magnetic field, electric field, stress, and heat. Smart materials whose rheological properties are controlled by externally applied magnetic field are known as magneto-rheological materials. Magneto-rheological materials actively used for engineering applications include fluids, foams, grease, elastomers, and plastomers. In the last two decades, magneto-rheological materials have gained great attention of researchers significantly because of their salient controllable properties and potential applications to various fields such as automotive industry, civil environment, and military sector. This article offers a recent progressive review on the magneto-rheological materials technology, especially focusing on numerous application devices and systems utilizing magneto-rheological materials. Conceivable limitations, challenges, and comparable advantages of applying these magneto-rheological materials in various sectors are analyzed critically, which provides a clear pathway to the researchers in selecting and utilizing these materials. The review starts with an introduction to the elementary description of magneto-rheological materials and their significant contribution in various fields. Following this, different types of the magneto-rheological materials, modeling of the magneto-rheological materials, magneto-rheological material–based devices, and their applications have been extensively reviewed to promote practical use of magneto-rheological materials in a wide spectrum of the application from the automobile to medical device.

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Section: Mrfmentioning

confidence: 99%

A state of art on magneto-rheological materials and their potential applications

Ahamed

Choi

Ferdaus

2018

Journal of Intelligent Material Systems and Structures

229

149

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“…Zite et al used an MR brake in orthopedic active knee brace to provide controllable resistance [7][8]. The maximum torque produced by the MR brake is 6 Nm when the applied coil current is 4.0 A [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of an assistive knee brace with magnetorheological actuator

Chen

Liao

2010

2010 IEEE International Conference on Robotics and Biomimetics

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Magnetorheological (MR) fluid is a smart fluid, which rheological behavior can be controlled by magnetic field. Rotary devices using MR fluids have the benefits of high torque, good controllability, and low power requirement. Recently, we developed a new MR actuator and applied it to assistive knee braces. It was demonstrated that the knee brace with this MR actuator can provide proper torque under control. In this study, we evaluate the knee brace with MR actuator on three aspects: power consumption, torque output performances, and safety. A knee brace with MR actuator is compared to the knee brace without MR actuator. The power consumption for both knee braces under bending and extending processes as well as normal walking are evaluated; the force/torque controllability and output inertia of knee brace are studied; and the safety under some extreme conditions is tested.

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“…Another rehabilitation device was developed to provide passive resistance during strength training of muscles (Dong et al, 2006), which employs a programmable axial MR fluid actuator that could apply a resistance as prescribed by a physical therapist. Similarly, rotary MR (Zite et al, 2006) and ER (Nikitczuk et al, 2007) actuators were proposed as controllable knee braces. Furusho et al (2006) developed a rehabilitation robot which is a 6-DOF (3 DOFs for the shoulder and elbow, and the other 3 DOFs for the wrist) force display system for upper limbs when each DOF was realised by ER actuators.…”

Section: Introductionmentioning

confidence: 99%

The performance of a smart ball-and-socket actuator applied to upper limb rehabilitation

Wahed

Balkhoyor

2018

Journal of Intelligent Material Systems and Structures

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Magnetorheological (MR) fluids are capable of providing continuously variable yield stresses in response to external magnetic fields. Greater potential application in rehabilitation may be realised if these fluids are utilised in controllable actuators offering multi-degree-of-freedom (MDOF) motions. This paper presents the results of the comparative performance of a ball-and-socket actuator, employing MR fluids as the controllable medium, using theoretical and numerical approaches. The theoretical model combines the viscous-friction and the controllable fielddependent characteristics of the MR fluid in which a Bingham plastic model is used to simulate the shear stress of the fluid under various input conditions. A special procedure to simulate the device performance using computational fluid dynamics (CFD) techniques, which were performed using ANSYS CFX computer code, is detailed. Three commercial MR fluids (MRF241-ES, MRF132-AD, and MRF122-2ED) were assessed and it was found that the simulated values of the device torque compared well with the theoretical values.

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A magnetorheological fluid based orthopedic active knee brace

Cited by 19 publications

References 0 publications

A state of art on magneto-rheological materials and their potential applications

A state of art on magneto-rheological materials and their potential applications

Experimental evaluation of an assistive knee brace with magnetorheological actuator

The performance of a smart ball-and-socket actuator applied to upper limb rehabilitation

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