Results 11 to 20 of about 276 (161)
Bilge keel design for the traditional fishing boats of Indonesia's East Java [PDF]
International Journal of Naval Architecture and Ocean Engineering, 2019 Seakeeping, especially for the roll motions, is of critical importance to the safe operation of fishing boats in Indonesia. In this study, a traditional East Java Fishing Boat (EJFB) has been analysed in terms of its seakeeping performance.
Wendi Liu +2 more
exaly +4 more sources
Investigation of Roll Damping on an FPSO with Sponsons and Bilge Keels [PDF]
Volume 1: Offshore Technology; Offshore Geotechnics, 2017 Within Hydrodynamics, estimating the roll damping are associated with difficulties and uncertainty. This is due to roll motion being highly non-linear compared to other degrees of freedom. The non-linearity arises from flow separation. Therefore, empirical formulas have been developed \cite{ikeda1977roll} for classical ship shapes.
Babak Ommani +4 more
core +11 more sources
STABILITAS SAMPAN TERBUAT DARI EMBER CAT BEKAS DENGAN BILGE KEEL PADA SUDUT 30 DAN 45 DERAJAT
Jurnal Teknologi Perikanan dan Kelautan, 2017 Ember cat bekas dapat dimanfaatkan sebagai alternatif pengganti kayu yang semakin sulit diperoleh dan pengganti bahan serat fiber yang tidak murah dalam pembuatan sampan. Namun sampan ini memiliki kekurangan, yakni stabilitasnya yang rendah.
Muhammad Agam Thahir +2 more
doaj +3 more sources
Numerical Research of the Viscous Effect of the Bilge Keel on the Damping Moment
Polish Maritime Research, 2015 Bilge keels are effective passive devices in mitigating the rolling motion, and the usage of them covers almost all the sea going vessels. This paper focuses on the viscous effect of the bilge keel, ignored the effect of the free surface and the effect ...
Deng Rui, Duan Wenyang, Ma Shan, Ma Yong
doaj +3 more sources
Bilge Keel Damping Component Prediction. Comparison of the Simple and Full Ikeda;s Method
Scientific Journal of Gdynia Maritime University, 2017 This paper presents a comparison of the bilge keel component of roll damping, determined by the full Ikeda’s method and its simplified version. The material discusses both procedures for determining the value of the bilge keel component and the ...
W. Wawrzyński
doaj +1 more source
Experimental and numerical investigation on the influence of bilge keel shape on roll damping
Marine StructuresExcessive roll amplitudes due to roll motion are undesirable in marine ships. Consequently, it is imperative to conduct a detailed analysis of roll motion and the associated roll damping characteristics. This study experimentally and numerically investigates the roll damping characteristics of bilge keels with various geometric shapes on a ship model ...
Hasan Islam Çopuroğlu +2 more
exaly +3 more sources
Frequency Dependence of Bilge Keels [PDF]
, 2018 The goal of this master's thesis is to inspect the damping generated by bilge keels. Two dimensional cross sections have been modeled both with and without bilge keels and simulated using the computational fluid dynamics software STAR-CCM+. The results have been post-processed in order to identify the damping forces using both a linearized approach and
Orvedal, Simen Haugen
core +3 more sources
Journal of Marine Science and Engineering, 2022 Among the 6 degrees of freedom (6-DoF), excessive roll motion is the most dangerous cause of ships capsizing. However, when analyzing the maneuverability of surface ships, the roll components have usually been ignored.
Thi Loan Mai +3 more
doaj +1 more source
URANSE-Based Numerical Prediction for the Free Roll Decay of the DTMB Ship Model
Journal of Marine Science and Engineering, 2021 In the present study, Computational Fluid Dynamics (CFD) is used to investigate the roll decay of the benchmark surface combatant DTMB-5512 ship model appended with bilge keels, sailing in calm water at different speeds (Fr = 0.0, 0.138, 0.2, 0.28 and 0 ...
Adham Bekhit, Florin Popescu
doaj +1 more source