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 semi-active acceleration control law is derived for controlling the acceleration of the crib directly. The semi-active control system is build using the dynamic equation for the jerk of the crib. The effectiveness is confirmed by using software for multibody dynamics simulation; Adams (MSC Software Co.), and some results are reported.
