2016/02/02 by Michael D. Woodward, Martijn van Rijsbergen, Keith W. Hutchinson +1
Decision Sciences · Engineering · Computer Science · #Scientific Measurement and Uncertainty Evaluation #Advanced Sensor Technologies Research #Sensor Technology and Measurement Systems
paper · doi:10.1016/j.oceaneng.2016.01.017
The inclining experiment is typically performed for all new-build ships and after any major refit. The purpose of the inclining experiment is to establish the vertical distance of the centre-of-mass of the ship above its keel in the lightship condition. This value is then taken as the point of reference when loading the ship, for establishing the ‘in-service’ stability, throughout the life of the ship. Experimental uncertainty analysis is commonly utilised in hydrodynamic testing to establish the uncertainty in a result as a function of the input variables. This can in turn be utilised to establish an interval about the result that may be expected to encompass a large fraction of the distribution of values that could reasonably be attributed to the measurement. This paper provides a methodology for calculating a confidence interval for the location of the centre-of-mass of a ship from an inclining experiment; and ultimately, in any load condition. The uncertainty compared to an assumed metacentric height of 0.15 m is provided for four classes of ship: buoy tender 0.15±0.15 m (±100%); super yacht 0.150±0.033 m (±22.0%); supply ship 0.150±0.047 m (±31.3%), container ship 0.150±0.029 m (±19.3%), ropax 0.150±0.077 m (±100%).