MACRO/MICRO CRANE

摘要

A composite crane (1) is disclosed which may be used to enable cargo handling at sea to move cargo from one ship to another ship. composite crane (1) may comprise a micro crane assembly (100) adapted to control motion of a lifting device (120), a macro crane assembly (200) adapted to be in communication with and control motion of the micro crane (100); and a controller (300), operatively communication with at least one of (i) the micro crane assembly (100) or (ii) the macro crane assembly (200), the controller (300) adapted to maintain a predetermined portion of the composite crane (1) in a substantially steady state relative to inertial space. Using control algorithm accessible to the controller (300) the controller may maintain a support platform (102) for the micro crane assembly (100) in a substantially steady state relative to inertial space or moving to compensate for some movement of the target platform (20).