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Estimation methods of roll damping based on roll decay data
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Dong ZHANG1, 2, Wen-tao WANG1, 2, Shu-xia BU1, 2, Wei LIU1, 2
Journal of Ship Mechanics | 2024, 28(3) : 328 - 340
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Journal of Ship Mechanics | 2024, 28(3): 328-340
• Hydrodynamics •
Estimation methods of roll damping based on roll decay data
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Dong ZHANG1, 2, Wen-tao WANG1, 2, Shu-xia BU1, 2, Wei LIU1, 2
Affiliations
  • 1.China Ship Scientific Research Center, Wuxi 214082, China
  • 2.National Key Laboratory of Science and Technology on Hydrodynamics, Wuxi 214082, China
Published: 2024-03-20 doi: 10.3969/j.issn.1007-7294.2024.03.002
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Ship roll damping estimation based on roll decay curves is very common in engineering. There are many methods to estimate damping from roll decay curves, which lead to difference in damping estimation results. In order to achieve the purpose of obtaining high-precision damping prediction methods, the principle of estimation of roll damping based on roll decay curves in recent years was analyzed in detail first in this paper and then its scope of application was expanded. The methods were divided into two categories according to the principle, namely, one based on piecewise linear assumption and the other based on parameter identification. The data of standard model (DTC) were used to verify and compare the characteristics of different methods, and the error sources of damping coefficient estimation were analyzed. The results show the accuracy of estimation is strongly related to the used method. The Froude energy method with clear physical meaning, few error sources, and insensitivity to measurement noise and error is recommended as the preliminary estimation method. If a damping model with sufficient accuracy can be found, estimation based on the Prony-SS method, which has an inherent noise suppression mechanism and a unique solution, can be further done to improve the accuracy.

estimation of roll damping  /  roll decay curve  /  extinction curve method  /  damping model
Dong ZHANG, Wen-tao WANG, Shu-xia BU, Wei LIU. Estimation methods of roll damping based on roll decay data[J]. Journal of Ship Mechanics, 2024 , 28 (3) : 328 -340 . DOI: 10.3969/j.issn.1007-7294.2024.03.002
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.03.002
  • Receive Date：2023-09-17
  • Online Date：2026-03-21
  • Published：2024-03-20
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  • Received：2023-09-17
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Affiliations
    1.China Ship Scientific Research Center, Wuxi 214082, China
    2.National Key Laboratory of Science and Technology on Hydrodynamics, Wuxi 214082, China
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