System and Method to Determine Relative Velocity of Crane and Target Load

摘要

A system and method are provided that allow for direct measurement of relative movement and relative velocity of movement of a crane (10) boom tip (14) in relation to a target load (24) on an adjacent vessel deck (20) allowing real-time determination of work load parameters under then-current conditions. A rangefinder (32) is located proximate boom tip (14) without requirement of a device on the target load or load vessel. A method accumulates relative movement, environmental data and as-built crane design to determine rated capacity of crane (10).

主权项

1. A system for an offshore crane operable to determine relative movement of a target load in relation to a crane boom tip, the system comprising:
a rangefinder mounted on a crane boom proximate said crane boom tip;
said rangefinder having a signal transmitter and a signal receiver;said rangefinder oriented to direct a signal downward;said rangefinder oriented to receive a refracted signal from a refractive surface proximate a target load; andsaid rangefinder including a signal processor; and a data processor on said crane operably connected to said signal processor;
said rangefinder, said signal processor, and said data processor operable to provide data output identifying relative vertical distance measurements of said boom tip to said refractive surface; andsaid system operable to determine velocity measurements of relative movement of said refractive surface in relation to said boom tip.