Abstract
An experimental study of the dynamic behaviors of a pneumatic cylinder is presented, and the relation between the friction characteristics and the vibration characteristics is discussed. In the experiments, a pneumatic cylinder is operated in upward or downward motion. The piston velocity was varied to investigate dynamic friction characteristics and their effect on the vibration characteristics. Step input signals or half-period sinusoidal input signals were supplied to flow control valves when measuring dynamic friction characteristics. When the frequency of the sinusoidal signal and the stepwise velocity are increased, the size of the hysteresis loop is increased. A stick-slip motion takes place more easily in upward motion. Finally, the effect of the dwell time on the dynamic friction characteristic is examined. The break-away force increases with the increase of the dwell time, but the dwell time for the break-away force to become the constant value (the maximum static friction force) considerably differs in the operation direction.
