DYNAMIC BEHAVIOR OF THE LIFTING CRANE MECHANISM

In the present paper the motion of a lifting mechanism of crane is con sidered. The unloading procedure is analyzed when the mass of the mech anism is varying. Due to the mass variation a reactive force appears. The influence of the reactive force on the motion of the system is inv estigated. The mechanical model of the mechanism is a simple pendulum with the variable mass and length. Some special cases are considered: (i) the relative mass variation rate is constant; (ii) the damping is varying and the relative length variation rate is constant and the win d force is present. The values of mechanism parameters, for which besi de the regular also nonregular motion may appear, are obtained. The me thod of Melnikov is applied.