Dynamic modelling of an intermittent slider–crank mechanism

This paper investigates kinematic and dynamic analyses of a novel intermittent slider–crank mechanism, which consists of four parts: a crank, a connecting rod associated with a pneumatic cylinder, a slider and two stops at both ends of a stroke. When the crank rotates continuously, the slider will contact with the stops and the pneumatic cylinder is compressed or extended. One periodic motion of the intermittent slider–crank mechanism driven by a permanent magnetic (PM) synchronous servomotor could be divided into three stages. Three governing equations are formulated by Hamilton’s principle. A spring model instead of the pneumatic cylinder is also used for comparison. Finally, the transient amplitudes obtained by using Runge–Kutta method are compared with those of the conventional slider–crank mechanism.