Simulation Study On Active Ambulance Stretcher

The aims of this research are to establish to non-linear mathematical model and active control technique of the hydraulically actuated active suspension system for a full stretcher ambulance ride model. It is characterized by a special-purpose 3-degree of freedom parallel structure. This compact mechanical architecture is able to compensate the shocks caused by road unevenness while performing pitch and roll rotations during accelerating, braking and curving phases. Stretcher loading and unloading operations have been considered. Direct and inverse kinematics and control strategy are discussed, and the system effectiveness is shown by simulation results. A simulation study is performed to proof the effectiveness and active control approach. The result thus compared with the passive suspension system. The simulation will be performed in MATLAB Simulink. The purpose of this research is not to create a better suspension, but to investigate how active control can improve ambulance stretcher ride and also to reduce this undesirable effect of the input vibration from road and driving behavior. A theoretical model of two-dimensional active control for ambulance stretcher suspension is proposed. Numerical calculations are carried out to examine the effectiveness of active control strategy, which is synthesized to minimize the mean square vertical and pitching response whilst considering the relative displacement of stretcher suspension. It shows that the active control with disturbance feed forwarded provides significant reduction of vertical and pitch angular acceleration of stretcher compared with the passive stretcher suspension. The relative displacement and resonance peak values of vibration components in the sensitive frequency range of human body are effectively suppressed in comparison with the passive stretcher