Dynamic tests of MR (Magnetorheologic) damper and analysis of response characteristics in semi-active knee prosthesis

Akalın, Çağrı; Orhanli, Tuna; Yılmaz, Atila; Şahin, İsmail

doi:10.1109/siu.2017.7960405

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…In this sense, these devices offer highly reliable operations, and their performance is relatively insensitive to temperature fluctuations or impurities in fluid (Rossi et al, 2018; Truong and Ahn, 2012). Finally, they exhibit a faster response time than pneumatic devices, making them highly preferable in human gait phase-based control applications (Akalin et al, 2017).…”

Section: Magnetorheological Fluid-based Devicesmentioning

confidence: 99%

“…These conditions allow the development of devices of smaller sizes, higher dynamic ranges, low failure rates, and high regulation capacity (Hua et al, 2021; Nordin et al, 2015). For instance, lower limbs designed with magnetorheological dampers can allow users to enjoy greater comfort and a more natural movement with lower energy consumption (Akalin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Magnetorheological fluid in prostheses: A state-of-the-art review

Dutra,

de Andrade,

Soares

et al. 2024

Journal of Intelligent Material Systems and Structures

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Magnetorheological fluids (MRF) are intelligent materials that can vary their yield stress in response to an applied magnetic field. This characteristic, combined with active and multifunctional control, allows the development of actuators with fast response time, low energy consumption, long service life, and reduced dimensions and weights. Various studies have been conducted to improve MR dampers in prosthetic applications, including knees, ankle-foot, hands, and sockets. Here, we present a critical review of the progress of MRFs in the prosthetic field. In addition, research in prostheses’ design, optimization, and control of magnetorheological actuators is investigated, along with MRF modeling, mode of operation, type of MR actuator, classification, and working principle of MRF-based devices. Although MRFs are considered promising materials for designing novel prosthetic devices, this review shows that applications have been predominantly focused on lower limb prostheses. We conclude by discussing possible future applications and challenges that must be faced to enable and improve commercial applications based on MRF technology.

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Section: Magnetorheological Fluid-based Devicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetorheological fluid in prostheses: A state-of-the-art review

Dutra,

de Andrade,

Soares

et al. 2024

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

Magnetorheological Damper With Variable Displacement Permanent Magnet for Assisting the Transfer of Load in Lower Limb Exoskeleton

Song,

Zhu,

et al. 2024

IEEE Trans. Neural Syst. Rehabil. Eng.

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Magnetorheological (MR) fluid exhibits the ability to modulate its shear state through variations in magnetic field intensity, and is widely used for applications requiring damping. Traditional MR dampers use the current in the coil to adjust the magnetic field strength, but the accumulated heat can cause the magnetic field strength to decay if it works for a long time. In order to deal with this shortcoming, a novel MR damper is proposed in this paper, which is based on a variable displacement permanent magnet to adjust the output resistance torque and applied to an exoskeleton joint for human load transfer assistance. A finite element model is used to determine the size parameters of the magnet and separator, so that the maximum output torque is optimal and the torque is uniformly distributed with the magnet displacement. The MR damper was characterized and calibrated on the experimental bench to make it controllable. The novel design enables the torque mass density of the MR damper to reach 8.83Nmm/g, the torque volume density to reach 48.7N/mm 2 , and has stability for long-term operation. Based on the torque control method proposed, a preliminary human experiment is conducted. The ground reaction force (GRF) data of the subjects is analyzed here, which represents the effect of load transfer to the exoskeleton. Compared with no exoskeleton, the GRF with exoskeleton is significantly reduced: the peak GRF in early stance phase is reduced by 24.14%, and in late stance phase is reduced by

show abstract

Dynamic tests of MR (Magnetorheologic) damper and analysis of response characteristics in semi-active knee prosthesis

Cited by 2 publications

References 4 publications

Magnetorheological fluid in prostheses: A state-of-the-art review

Magnetorheological fluid in prostheses: A state-of-the-art review

Magnetorheological Damper With Variable Displacement Permanent Magnet for Assisting the Transfer of Load in Lower Limb Exoskeleton

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