Dynamic Friction Behaviors of Pneumatic Cylinders

Abstract

<span>This paper deals with experimental investigation and modeling of dynamic friction behaviors in the sliding regime of pneumatic cylinders. Using three pneumatic cylinders, friction characteristics are investigated and modeled under various conditions of velocity variation and pressures. It is shown that a hysteretic behavior can be seen at low velocities in the friction force-velocity relation and the friction force varies nearly linearly with the velocity at high velocities. The hysteretic loop is expanded to higher velocities when the frequency of the velocity variation is increased, and its size is increased with increasing driving pressure and is decreased with increasing resistance pressure. It is shown that such behaviors can be relatively accurately simulated by the new modified LuGre model in which a few static parameters are varied with the frequency of velocity variation.</span><span></span

Dynamic Behaviors of Pneumatic Cylinder (Friction and Vibration Characteristics)

“…These behaviors agree with those reported by Tran et al 5) . In both strokes, it is seen that at the beginning of the cylinder operation, the maximum acceleration a z max is generated at the same time the friction force is rapidly decreased from the maximum value to the minimum one.…”

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“…The friction force Fa is a function of P1, P2 and piston velocity. In this specific case, Fa is manly dependent on P1 and P2, and it was defined experimentally [13][14][15]. Solving the equation system above gives the acceleration and then the displacement by integration.…”