Abstract
To reduce the collision shock and injury risk to an infant in an in-car crib (or in a child safety bed) during a car crash, it is necessary to keep the force acting on the crib constant and below a certain allowable value. To this end, we propose a semi-active in-car crib with joint application of regular and inverted pendulum mechanisms. The crib is supported like a pendulum by arms, and the pendulum system is supported like an inverted pendulum by arms. This system not only reduces the impulsive force but also transfers the force to the infant's back using a spin control system, i.e., the force acts perpendicularly on the crib. The spin control system was developed previously. The present study focuses on the development of a crib movement system. In this paper, the effectiveness of the proposed in-car crib system is confirmed by the model experiment. The results show that the maximum acceleration of the crib in case of the crib moved is smaller than that in case of the crib fixed. Therefore, it is clarified that the proposed system is able to reduce the maximum acceleration affecting the infant in the crib. Then, the control law, which feeds back the acceleration of the crib, is proposed, and the effectiveness is examined using numerical simulation.
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