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Improvement of prediction methods of power increase in regular head waves using calm-water and resistance tests in waves
This paper applies load variation method to predict speed-power-rpm relationship along with propulsive performances in regular head waves, and to derive overload factors (ITTC, 2018). ‘Calm-water tests’ and ‘resistance test in waves’ are used. The modified overload factors are proposed taking non-li...
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Published in: | International journal of naval architecture and ocean engineering 2021, 13(0), , pp.278-291 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | This paper applies load variation method to predict speed-power-rpm relationship along with propulsive performances in regular head waves, and to derive overload factors (ITTC, 2018). ‘Calm-water tests’ and ‘resistance test in waves’ are used. The modified overload factors are proposed taking non-linearity into consideration, and applied to the direct powering, and resistance and thrust identity method. These indirect methods are evaluated through comparing the speed-power-rpm relationships with those obtained from the resistance and self-propulsion tests in calm water and in waves. The objective ship is KVLCC2. The load variation method predicts well the speed-power-rpm relationship and propulsion performances in waves. The direct powering method with modified overload factors also predicts well. The resistance and thrust identity method with modified overload factor predicts with a little difference. The direct powering method with overload factors predicts with a relatively larger difference.
•The load variation method is applied to predict speed-power-rpm relationship along with propulsive performances in regular head waves, and to derive overload factors (ITTC, 2018).•‘Calm-water tests’ and ‘resistance test in waves’ are used.•The modified overload factors are proposed taking non-linearity into consideration.•The load variation method predicts well the speed-power-rpm relationship and propulsion performances in waves.•The direct powering method with modified overload factors also predicts well.•The resistance and thrust identity method with modified overload factor predicts with a little difference.•The direct powering method with overload factors predicts with a relatively larger difference. |
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ISSN: | 2092-6782 2092-6790 |
DOI: | 10.1016/j.ijnaoe.2021.03.005 |