Abstract
The basic motions of the slewing crane as construction machines are classified into cargo windup, boom derricking and boom slewing. The purposes of controlling the crane are to transfer to the target point the cargo as quickly as possible with suppressing the swaying and to quickly minimize the residual sway at the target point. At present, the crane operation depends on the skill and sense of the operator, so its automatic operation is desirable from the standpoint of economy and safety. Concerning the anti-sway control of a rotational crane, several methods are known. We have developed the method based on the idea of the backstepping approach and have got remarkable effects.
