To reduce the collision shock and injury risk to a baby in a child-car bed during a car crash, it is necessary to keep the impulsive force acting on the bed constant and below a certain allowable value. To this end, a semiactive child-car bed with joint application of regular and inverted pendulum mechanisms is proposed. This system not only reduces the impulsive force but also transfers the force to the baby’s back via a spin control system, i.e., the force acts perpendicularly on the bed. The spin control system has previously been developed.In this study, an acceleration control system is developed. The passive characteristics of the child-car bed are examined via numerical simulations using mechanism analysis software that considers the vehicle’s space limitations. Then, a semiactive control law that adjusts the damping coefficient of the revolute joint is proposed, and its effectiveness is confirmed via numerical simulations. The proposed system gradually increases the acceleration affecting the bed and keeps it at a reference value.
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