Deflection Analysis of a Robotic Bed on the Applied Loads and Its Postures for a Heavy-Ion Therapeutic System

In this paper, we present two preliminary experiments, under laboratory environment, in order to determine whether or not our robotic bed needs a deflection correction function due to patient’s various weights and its postures. We measured (1) robotic arm’s deflection with various loads from 0 to 80 kg, and (2) variation of carbon bed’s deflection with various postures in which the bed is tilted by ±20° roll and pitch angles respectively. Experimental results show that the robotic arm’s deflection measured up to 2.6 mm and the variation of carbon bed’s deflection measured greater than 0.5 mm when the tilted angle was more than 15°. We, therefore, concluded that the deflection correction function is necessary for our robotic bed especially in the case of head/neck treatment in which the tilted angle is needed to be more than 15°.