イナータを用いた救急車用防振架台の設計

抄録

This study proposes a vibration isolating bed for ambulance using an inerter. The structure of the bed is assumed to consist of the foundation fixed to the floor of the ambulance and movable table on which the stretcher is to be placed, the foundation and table are connected only by the suspension including the inerter in the direction of the foot and the left and right. Since the inerter can lower the gain of the high frequency band and delay the response, acceleration can be reduced in a limited space. We consider the bed as a plant and suspension as a controller, and we construct the state equation from this formulation. In order to reduce the acceleration within the movable range of the bed, the controller that minimizes the H_∞ norm of the transfer function from the external force acting on the foundation to the bed is calculated as a Bilinear matrix inequality (BMI) and we determine the structure and coefficient of the suspension from the transfer function. The usefulness of the proposed bed is verified from numerical simulations.