Results 11 to 20 of about 676 (199)

Ship roll damping control [PDF]

Annual Reviews in Control, 2012
The technical feasibility of roll motion control devices has been amply demonstrated for over 100 years. Performance, however, can still fall short of expectations because of difficulties associated with control system designs, which have proven to be far from trivial due to fundamental performance limitations and large variations of the spectral ...
Tristan Perez, Mogens Blanke
exaly   +6 more sources

Ship roll damping via direct inverse neural network control system

Alexandria Engineering Journal, 2018
Undesired roll motions of surface vessels under sea way have negative influence on passengers, crew members, equipment and cargo. Damping roll motions is a complex problem due to unpredictable and irregular nature of marine environmental disturbances ...
Taher Awad, Mohamed Abd-elfatah Elgohary, Tawfik Elemam Mohamed   +2 more
doaj   +4 more sources

Influence of bilge-keel configuration on ship roll damping and roll response in waves [PDF]

Ocean Engineering, 2020
Abstract The bilge keel, which is a widely used tool for passively reducing the roll motion of ships, generates and releases vortices periodically when the ship rolls, leading to dissipation of the roll kinetic energy and rise in the roll damping of the ship. The initial heel angle, the height and installation angle of the bilge keel, as well as roll
Yichen Jiang, Yunfeng Ding, Yuan Sun
exaly   +4 more sources

Numerical Simulation of Naval Ship's Roll Damping Based on CFD

Procedia Engineering, 2012
AbstractRoll damping test is used to calculate roll damping coefficient, which is an important coefficient in predicting ship seakeeping capability. And because of the complexity of naval ship's shape (with bulbous bow and transom stern), it's rare to find the numerical simulation of its roll damping motion. In this paper, DTMB5512 model's roll damping
Yang, Boa, Wang, Zuo-chao, Wu, Ming
exaly   +6 more sources

Numerical study of scale effects of viscous roll damping for a container ship

Brodogradnja
In this paper, the scale effects on a container ship’s roll motion are investigated by numerical approach. The accuracy of the numerical method is verified by comparing numerical results with experimental data through a grid sensitivity study.
Nguyen Thi Ha Phuong, Tomoki Taniguchi, Toru Katayama   +2 more
doaj   +4 more sources

Inspection of stability of a general roll-damping of a ship via non-perturbative approach [PDF]

Scientific Reports
The current study explores nonlinear stability in vessels with roll-damping to ensure safety in realistic maritime conditions, thereby expanding stability.
Galal M. Moatimid, Mona A. A. Mohamed, M. K. Abohamer   +2 more
doaj   +2 more sources

Determination of ship roll damping coefficients by a differential evolution algorithm [PDF]

Journal of Physics: Conference Series, 2021
Abstract The execution of the so-called extinction tests represents the classical experimental method used to estimate the damping of an oscillatory system. For the specific case of ship roll motion, the roll decay tests are carried out at model-scale in a hydrodynamic basin.
Mauro F., Nabergoj R.
openaire   +5 more sources

Ship Roll Damping Analysis [PDF]

, 2017
The increased demand for transport capacity led to new hull designs with a large bow flare that are able to carry more containers. These new hull shapes influence the ship stability and may lead to large roll angle amplitudes, which lead to high accelerations and thereby to a high safety risk for human life, ship and cargo.
Piehl, Henry
openaire   +2 more sources

Numerical Assessment of Roll Motion Characteristics and Damping Coefficient of a Ship [PDF]

Journal of Marine Science and Engineering, 2018
Accurate calculation of the roll damping moment at resonance condition is essential for roll motion prediction. Because at the resonance condition, the moment of inertia counteracts restoring moment and only the damping moment resists increase in the ...
S.S. Kianejad, Jaesuk Lee, Yi Liu, Hossein Enshaei   +3 more
doaj   +2 more sources

On Ship Roll Damping : Analysis and Contributions on Experimental Techniques

, 2019
El amortiguamiento en balance es un factor clave para la correcta predicción del comportamiento de un buque en la mar. No obstante, predecir de manera adecuada el coeficiente de amortiguamiento es una tarea compleja. La forma más aceptada para estimarlo es la realización de ensayos experimentales, siendo el más común el ensayo de extinción.
Oliva Remolà, Adriana
openaire   +3 more sources