Generally, the trolley of overhead cranes or gantry cranes and the load are connected by the flexible wire rope. The operation of the trolley or the crane causes the load's sway because of the inertia of the trolley, crane and load. Load's sway is not favorable to the crane's fast contraposition. Passive control of the load's anti-sway is often easier than the active control. The kinds of the load's anti-sway usually include mechanical system, hydraulic system, wire rope system, mechanical electroni...