# Veröffentlichungen 2016

[67215] |

Title: Dynamic Stability of Heavy Lift Vessels During Loss of Tandem Load |

Written by: Hannes Hatecke |

in: Promotion 2016 |

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**Abstract: **This study investigates the hazard of capsizing of crane ships after an accidental loss of the
lifted load. If this load is lifted by two cranes in a so-called tandem lift, the load generally
does not fall off both cranes simultaneously. In fact, both cranes fail rather subsequently and
thus there exist a duration where the load and the ship act as a coupled multi-body system. In
order to access the coupled dynamics, this study presents a simulation method which computes
the motions of a loss of load during a tandem lift. Here, the load and the ship are modeled
as two rigid bodies which are connected by a rigid rope. Thus, a fully non-linear multi-body
system with 11 degrees-of-freedom is obtained for which the equations of motions are given in
minimal coordinates. The hydrodynamic forces are considered by a superposition of non-linear
hydrostatic forces, linear radiation forces, and viscous roll damping forces. The radiation forces
are efficiently computed by a state-space model which is based on a newly developed time
domain identification scheme for multiple degrees-of-freedom systems. Before the proposed
simulation method is applied to assess the hazard of capsizing of crane ships after a loss of
load during tandem lifts, it has successfully been validated against a series of model tests. It is
found that the timing of the subsequently occuring loss of load and the crane configurations
can have a large influence on the likelihood of a capsize. Furthermore, current stability criteria
are reviewed against a realized direct assessment of the dynamic stability after a loss of load.