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Steady State Analysis of Pneumatic Servo Drives

This paper introduces new approaches and design models aimed at determining the steady state behaviour of pneumatic servo drives. Relationships characterizing actuator velocity and chamber pressure with respect to valve displacement are established. Certain parameter ratios are defined and a novel analytical solution is offered, which may provide the basis of a better and more useful design methodology than conventional graphical methods. The observations and analysis are applicable to both linear (symmetric and asymmetric) and rotary drives controlled by either a single five-port servo valve or two independent three-port servo valves.