Abstract
Now, a wheelchair is being used widely. However many users have troubled for lumbago. In this research, lumbago prevention was approached by biomechanics and control engineering. As premise, lumbago was defined as rotation of a pelvis and change of a lumbar vertebra curve being the causes. Therefore, it approximates posture to the ideal vertebral column curvature, in order to prevent lumbago. Then, fast, the inclined angle of a pelvis and the curve radius of a lumbar vertebra in various seating positions were considered. Based on it, in order to reproduce posture change on a computer and evaluate lumbago, human equivalent model was created in analyzing anatomy in detail. Here, modeling was carried out by three sides, frame, mass and muscular. Posture change was simulated using the model which simplified the previous one on the software DADS. The simulation result of the evaluation model was able to express mathematically change of a lumbar vertebra curve as evaluation of an ache. As a result, it was verified that the built model is appropriate to evaluate lumbago. Furthermore this paper proposed the wheelchair with posture control for lumbago prevention adopting a swing seat, a lumbar support, and a pelvis support.
