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urate


The surface of the measured object must present a random speckle pattern, which if not naturally present, can be printed, painted or projected.


The deformation measurements of flexible propellers were successfully carried out in the Cavitation Tunnel in open water conditions and behind a ship model in our Depressurised Wave Basin. Further tests in the Cavitation Tunnel in non-uniform flow and at full-scale on a sailing vessel are expected in the near


future. During the application of DIC we were faced with many challenges, such as vibrations in the test setup, the high rotational speed of the propeller and the light refraction due to the air-water interface. All these challenges can easily compromise the quality of the results. However, if these are correctly accounted for it is possible to achieve very high measurement accuracy.


The assessment of measurement accuracy during the tests in the Cavitation Tunnel


showed that the deformation data was collected with an accuracy of 0.02 mm: an impressive result showing the effectiveness of this technique.


The main advantage of the optical measure- ment technique is that we can design and accurately validate flexible propeller technology in a controlled environment in which realistic operational conditions can be simulated and accurate measurements can be achieved.


report 17


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