Stability assessment of tugs in escort operations using a time domain simulation
Dynamic behaviour after impact loads
Renske Marijnissen (TU Delft - Mechanical Engineering)
Henk de Koning Gans – Mentor (TU Delft - Mechanical Engineering)
Siebe Rooijakkers – Mentor (Damen Shipyards)
Peter Wellens – Graduation committee member (TU Delft - Mechanical Engineering)
Arthur Vrijdag – Graduation committee member (TU Delft - Mechanical Engineering)
Niek Teeuwen – Graduation committee member (STC Group)
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Abstract
Over the past years tugs are evolving to more compact designs equipped with large power installations. This inherently increases the risk of accidents, demanding a more reliable prediction of the tug’s dynamical behaviour in critical situations. To capture the dynamic behaviour of a tug, a time domain simulation tool has been developed and used to evaluate the tug’s safety in those critical situations. Multiple methods derived from recent studies are combined and used to establish a reliable description of the involved hydrodynamic forces and moments. Besides a sensitivity study is performed to investigate the impact of inaccurate approximations of those forces and moments. Furthermore, the sensitivity to a change in more design and operation related parameters has been investigated. Finally, the research includes a step by step validation and an evaluation of the current regulations.