This research examines compensation methods to improve pneumatic servo systems' performance by addressing friction and nonlinearities.
Friction effects are one of the major sources which create uncertainties and nonlinearities in the control of pneumatic drives. The effects of friction are twofold, firstly leading to position inaccuracy (e.g. deadzone and limit cycling) and secondly causing a significant delay when a move is initiated. In this paper, the patterns of friction effect on system response are established and various compensation methods are studied as to their effectiveness in overcoming problems caused by the friction on system performance (static and dynamic behaviour).
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Pu et al. (1995) studied this question.
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