The control of boom cranes is a topic that has generated a significant amount of research. Particularly, cranes mounted on ocean-going ships pose a significant challenge. Due to the harmonic disturbance resulting from ocean conditions, open-loop control methods such as input shaping have been largely ignored in this area of research. This work will develop linearized governing equations for a planar, harmonically-excited boom crane. Using these approximations, a command-shaping strategy that minimizes payload deflection during and shortly after a luff command will be presented. It is anticipated that this method will be used to smooth the transition to a closed-loop controller which engages after the operator-given command is complete.
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