Design of new prosthetic leg damper for above knee amputees using a magnetorheological damper activated permanent magnet only

Ae-Ri Cha; Ji-Young Yoon; Tae-Hoon Lee; Seung-Bok Choi

doi:10.1117/12.2296760

15 March 2018 Design of new prosthetic leg damper for above knee amputees using a magnetorheological damper activated permanent magnet only

Ae-Ri Cha, Ji-Young Yoon, Tae-Hoon Lee, Seung-Bok Choi

Author Affiliations +

Proceedings Volume 10595, Active and Passive Smart Structures and Integrated Systems XII; 105952Z (2018) https://doi.org/10.1117/12.2296760
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

Magnetorhological fluids (MR) have been applied to numerous devices or systems which require forward or feedback control to achieve desired performances. One of applications is the rehabilitation device. MR dampers applied to artificial joints are implemented with two phases; stance phase: motion to support the feet on the ground, and swing phase : motion to step out. In case of stance phase, the damping force should be increased by applying the magnetic field to support the body. On the other hand, in case of swing phase, the damping force should be removed by not applying the magnetic field so that the prosthesis can be easily rotated by the motor. In this study, a special mechanism of MR damper is proposed to make a prosthetic leg which can derive on/off mode using permanent magnet only. The design mechanism is undertaken and damping force is analyzed to validate the effectiveness of the proposed damper system for the patient’s motion without control device.

Citation Download Citation

Ae-Ri Cha, Ji-Young Yoon, Tae-Hoon Lee, and Seung-Bok Choi "Design of new prosthetic leg damper for above knee amputees using a magnetorheological damper activated permanent magnet only", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 105952Z (15 March 2018); https://doi.org/10.1117/12.2296760

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