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KMID : 1137820200410050203
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의공학회지
2020 Volume.41 No. 5 p.203 ~ p.209
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Development of Active Suspension System for Wheelchairs to Improve Riding Comfort of Gait Disorders
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Heo Yeong-Jun
Jeon Geum-Sang
Lee Sang-Hun
Choi Seong-Dae
Jang Ik-Gyu
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Abstract
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As the number of people with gait disorders increases, the demand for using wheelchairs increases and the area of a ctivity for people with disabilities expands, thereby they increasing the demand for riding comfortability in various driving environments. Therefore, this study is to develop an entry-level active suspension system that apply to wheelchairs and to evaluate its usability. The suspension applied in this paper consists of a coil spring, a shock absorber, a control module to control the strength of the shock absorber, and a road surface condition monitoring system. A wheelchair occupant secures the riding comfort by adjusting the coil strength of the shock absorber in 12 steps according to various road conditions. Therefore, the mechanical properties were evaluated through the structural analysis of the suspension system, and the tendency toward the magnitude of the road surface vibration attenuated according to the rigidity of the suspension through the vibration test was attempted. In conclusion, as a result of structural analysis of the suspension system, stress in a range lower than the yield strength of the material was generated, and the vibration test showed the effect of attenuating the vibration generated from the road surface when the stiffness of the suspension was adjusted.
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KEYWORD
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Wheelchair, Shock absorber, Suspension system, Vibration test
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