Abstract No.F180124-109
Author name(s): Jaehoon LEE1, Yonghwan KIM1, Youngbum LEE2
Company: 1. Seoul National University, Korea; 2. Daewoo Shipbuilding & Marine Engineering Co., Ltd., Korea
Roll damping of ships and floating offshore structures has nonlinear components due to viscous effects. This has been extensively studied mostly based on the concept of equivalent linear damping, which is popular for computational studies with potential method. However, the analysis of quadratic damping coefficient has not been well defined mathematically. This paper considers the application of Hilbert transform for the quadratic component of roll damping, focusing on analysis of experimental data measured at towing tank. For the time series measured from free-roll decay tests, the Hilbert transform technique is applied in order to obtain the modal characteristics of the signals. The application is included for a drill ship, which has roll reduction device. The results are compared with those of polynomial-fitting method.
KEY WORDS: Hilbert transform; quadratic damping; roll damping; nonlinear damping
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