| Abstract | This is a summary for the general guidelines proposed to the 26th ITTC (2008) to evaluate and express uncertainty in measurements, in naval architecture experimental measurements, offshore technology testing, and experimental hydrodynamics. Traditionally, up to now-2008, ITTC adopted Uncertainty Analysis (UA) procedures that were based on AIAA methodologies. However, due to pressure from international laboratories, new UA procedures based on the ISO (1995) are proposed for the evaluation of uncertainties in experimental hydrodynamics. The information in this report shows the main steps for how the ISO (1995) guidelines are used to calculate uncertainties in experimental hydrodynamics and ocean technology tank testing. The guidelines provided in this report are also applicable to the evaluation of uncertainties associated with conceptual design, set up of actual experiments, methods of measurements, instruments calibrations, Data Acquisition Systems (DAS), and reporting. Example applications include calibration of instruments (a commercial vertical gyroscope in roll), characterization of flow speed in a water tunnel, and uncertainties in standard captive model testing (standard resistance tests). |
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