The paper proposes a model of man-wheelchair system to calculate the vibration of wheelchair caused by motion on road with various roughness. A spring-mass model that is used calculating motion of a car running on the road with roughness without considering driver weight. But in this case, it is important to consider human weight because the vibration of wheelchair is dominated by human weight rather than wheelchair's weight. This model appears in the relationship between vibration of wheelchair and road roughness.
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