PMM MODEL TEST WITH DDG51 INCLUDING UNCERTAINTY ASSESSMENT

The present report it is edited in the framework of the ITTC Manoeuvrability Committee activities in order to: 1. assess the experimental uncertainties related to the INSEAN Planar Motion Mechanism (PMM); 2. compare the INSEAN data with the IIHR and Force Technology towing tanks; 3. validate the CFD codes. The scope of the work it is to develop a procedure for the uncertainty assessment to be used for the analysis of global forces acting on ship model during a PMM test. In this report are not considered the uncertainties on the traditional manoeuvring coefficients but are examined only the uncertainties on the hydrodynamic forces. Tests are carried out with a 5.71 m between Lpp DDG51 frigate (INSEAN model C. 2340) that is a standard dimension for the INSEAN Large Amplitude PMM. The uncertainty analysis carried out in the present work it is directly related to the scheme of the INSEAN PMM and some analytical development can be slightly different for different equipment.