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A CFD–FEA coupled method for ship hydroelasticity analyses
Published in C. Guedes Soares, T.A. Santos, Trends in Maritime Technology and Engineering Volume 1, 2022
Jialong Jiao, Shan Wang, C. Guedes Soares
The prediction of ship seakeeping behavior and wave loads is fundamental in the design and evaluation of ships. With the development of modern ships towards large-dimension, high-speed and light-weighted, the two-node natural frequency of hull girder falls into the range of the encounter frequency of ordinary suffered sea states. Therefore, wave-induced structural responses and deformations, termed as hydroelasticity, of ships should be accounted for in addition to the global wave loads especially for large ships operating in severe waves with high speed (Kim & Kim, 2014).
Numerical crashworthiness analysis of a spar floating offshore wind turbine impacted by a ship
Published in C. Guedes Soares, Developments in the Collision and Grounding of Ships and Offshore Structures, 2019
S. Echeverry, L. Márquez, Ph. Rigo, H. Le Sourne
Seakeeping is known as the reaction of a floating body when it is subjected to waves (or any force that can change its current position). Translational movements along X,Y and Z axes are known assurge, sway and heave, and rotational ones are roll, pitch and yaw (Fig. 16).
Operability analysis of traditional small fishing boats in Indonesia with different loading conditions
Published in Ships and Offshore Structures, 2023
Muhammad Iqbal, Momchil Terziev, Tahsin Tezdogan, Atilla Incecik
The percentage operability for a particular wave heading, seakeeping criteria, and ship speed is obtained by Equation 14. is percentage operability for a particular wave heading, seakeeping criterion, and ship speed. is the probability of occurrence of a significant wave height in interval below the limiting significant wave height with a wave period in interval . The percentage operability for all headings with a certain seakeeping criterion and ship speed is obtained by Equation 15. is percentage operability for all headings with a certain seakeeping criterion and ship speed. is the percentage operability for the ith wave heading. is the probability of occurrence of the ith wave heading βi. If has an equal probability, then Percentage Operability for all heading can be calculated as average of Percentage Operability for all heading βi.
Spectral fatigue analyses comparison study: Suez Canal vs. Cape of Good Hope Arab Academy for Science, Technologies and Maritime Transport (AASTMT)
Published in Journal of Marine Engineering & Technology, 2020
Mohamed Essallamy, Alaa Abdel Bari, Mohamed Kotb
The structural detail considered in this study is a main deck flat bulb FB longitudinal stiffener in an Aframax midship section. The Response Amplitude Operator (RAO) of the vertical wave bending moment at the midship section RAOM, V for ballast and full load condition is first obtained by using seakeeping analysis based on transfer function and the IACS CSR. RAOs were obtained for 9-wave encounter angles (0–180° with step of 22.5°) for ballast and loaded conditions. For the purpose of relative comparison of fatigue damage for different routes, particularly if overall lifetime of a ship is considered a speed reduction of 15 KT is seen suitable as an average (Kwon, 1981; IMO, 2009).
Numerical analysis of fish farm behaviour in real operational conditions
Published in Ships and Offshore Structures, 2020
J. E. Gutiérrez-Romero, A. J. Lorente-López, B. Zamora-Parra
To select a suitable mesh for the seakeeping computations, Response Amplitude Operator (RAO) curves of floaters collars are analysed. Figure 6 provides a comparison of surge and pitch RAO curves. As can be noticed, the differences found are quite small, for the movements compared. It can be concluded that RAO curves are not affected enough so much by a mesh refinement of floating bodies for these cases. Differences can be considered as not significant. Therefore, the finest meshes are not required for accurate seakeeping calculations.