Abstract
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 semi-active 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. In the proposed system, the child-car bed is supported like a pendulum by arms, and the pendulum system is supported like an inverted pendulum by arms. And, the acceleration affecting the bed is controlled by adjusting moments of the revolution joint between the base and the arm and the revolution joint between the arms. Then, its effectiveness is confirmed via numerical simulations. The proposed system gradually increases the acceleration affecting the bed and keeps it at about the reference value of -25 G, when the vehicle decelerates at 30 G.
