Results 131 to 140 of about 268 (171)

A cost-effective 200 kV cryo-EM core facility for high resolution single particle analysis. [PDF]

Methods Microsc
Gauvin CC, Findlay JL, Hophan-Nichols C, Lawrence CM.   +3 more
europepmc   +1 more source

A Scoping Review on Simulation-Based Design Optimization in Marine Engineering: Trends, Best Practices, and Gaps. [PDF]

Arch Comput Methods Eng
Serani A, Scholcz TP, Vanzi V.
europepmc   +1 more source

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Forced roll simulations and ship roll damping computations using URANS

2016 13th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2016
Ship roll response and associated roll damping estimation have long been an area of research, due to their detrimental nature to ship safety and habitability, and owing to the challenging roll damping computations that remain vague because of difficulties arising from strong viscous effects typical of ship roll motion.
Wenyang Duan, Shakeel Ahmed
exaly   +2 more sources

Nonlinear Roll Damping of Ship Motions in Waves

Journal of Offshore Mechanics and Arctic Engineering, 2005
Nonlinear roll damping has a profound influence on ship motions and stability in ocean waves. In this study, an experimental investigation is conducted on the nonlinear roll damping of a ship in regular and irregular waves. The random decrement method, previously used in linear roll damping prediction, is extended to nonlinear roll damping estimation ...
Longbin Tao
exaly   +3 more sources

Estimation of ship roll damping—A comparison of the decay and the harmonic excited roll motion technique for a post panamax container ship

Ocean Engineering, 2016
The decay motion as well as the harmonic excited roll motion are established techniques to estimate roll damping for ships. This paper compares the advantages and disadvantages of both techniques and focuses on their applicability. Different analysis methods for both techniques to determine the nonlinear roll damping moment are investigated with the ...
Moustafa Abdel-Maksoud, Dag-Frederik Feder   +1 more
exaly   +2 more sources

Stochastic inverse modeling of nonlinear roll damping moment of a ship

Applied Ocean Research, 2013
Abstract This work presents an application of stochastic inverse method for the determination of nonlinear roll damping moment of a ship at zero forward speed. Nonlinear roll damping moment was estimated from the measured dynamic responses through stochastic inverse model.
S.L. Han, Takeshi Kinoshita
exaly   +2 more sources

Optimised Output Sensitivity Loop Shaping Controller for Ship Rudder Roll Damping

IFAC Postprint Volumes IPPV / International Federation of Automatic Control, 2011
This paper describes the design of a Rudder Roll Damping (RRD) controller based on the linear model of the ship to cope the wave disturbances. A preliminary study of fundamental limitations for linear feedback controllers provides suggestions for the controller design.
Mogens Blanke, Gianluca Ippoliti
exaly   +3 more sources

Nonlinear Models of Ship Roll Damping

International Shipbuilding Progress, 1988
The paper looks at various forms for the roll damping moment of ships and introduces two techniques to identify the parameters of the various models together with a methodology for their evaluation. The emphasis in the paper is on the possibility of using complete portions of roll decay curvf1s rather than decrement curves derived from the peak values ...
Bass D.W., Haddara M.R.
openaire   +1 more source

An overview of the prediction methods for roll damping of ships

Ocean Systems Engineering, 2015
Of all the six degrees of freedom, the roll motion of a ship is the most poorly understood and displays complicated phenomena. Due to the low potential wave damping at the natural frequency, the effective analysis of ship roll dynamics comes down to the accurate estimation of the viscous roll damping.
Jeffrey Falzarano, Abhilash Somayajula, Robert Seah   +2 more
openaire   +1 more source

A Note on the Form of Ship Roll Damping

Journal of Ship Research, 1978
The objective of the present work was to develop an approximation to the conventional mixed linear-plusquadraticship roll damping model so that analytical obstacles could be overcome in the application of the functional series expansion to nonlinear ship rolling. A mixed linear-plus-cubic approximation was found to be reasonable for this purpose.
openaire   +1 more source