Design of passive anti-roll tanks for roll stabilization in the nonlinear range

Youssef, Khaled; Ragab, Saad A.; Nayfeh, Ali H.; Mook, Dean T.

doi:10.1016/s0029-8018(01)00021-x

Cited by 43 publications

(6 citation statements)

References 6 publications

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“…The water tanks in the experimental ship model are filled with water to simulate the fullload state without the FSE, and different proportions of free-liquid loads are configured in some tanks to simulate the FSE. (12)(13)(14)16) Because the FSE will reduce the metacentric height and affect the ship stability, we calculate the rolling coefficient under various conditions. In this study, the inclination test is used to obtain the center of gravity above the keel (KG) (10,12,15) and the rolling coefficient of the empty ship.…”

Section: Experimental Methodsmentioning

confidence: 99%

Application of Embedded Sensor Systems to Improve Safety for Container Ships in Cargo Loading or Unloading Operations

Wong¹,

Kuo²,

Pu³

et al. 2021

Sensors and Materials

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Section: Experimental Methodsmentioning

confidence: 99%

Application of Embedded Sensor Systems to Improve Safety for Container Ships in Cargo Loading or Unloading Operations

Wong¹,

Kuo²,

Pu³

et al. 2021

Sensors and Materials

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“…For more details about this model, see Youssef et al (2002). In this comparison, the seaway is assumed to be regular and the wave amplitude is taken to be 0.01; i.e.…”

Section: *! 89986g B9 G4a> @4ff 4a7 7<fge<5hg<ba B9 G4a> Gh58fmentioning

confidence: 99%

“…They found that a well-tuned, well-designed tank can be very effective in reducing the roll motion. Youssef et al (2002) studied roll stabilization by passive antiroll tanks, taking into account all six degrees of freedom of the ship motion; however, they used the one-degree-of-freedom (1DOF) equation to describe motion, presented by Abdel Gawad et al (2000). They studied unstabilized and stabilized roll motions of a S60-70 ship with forward speed and beam waves.…”

mentioning

confidence: 99%

Roll Stabilization by Passive Anti-Roll Tanks Using an Improved Model of the Tank-Liquid Motion

Youssef¹,

Mook²,

Nayfeh³

et al. 2003

Journal of Vibration and Control

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Roll motion is an undesirable feature of the behavior of a ship in rough seas, and so it is natural to consider ways of reducing it. The most common devices for increasing roll damping are bilge keels. However, the effectiveness of keels is limited, and anti-roll tanks and fins are used when more control is required. Moreover, unlike keels, anti-roll tanks can be used when the ship is not underway. Our objective is to develop design procedures for passive tanks for roll reduction in rough seas. To this end, we develop an improved model of the passive tank-liquid motion in this paper. This tank consists of U-shaped tubes placed side by side along the length of the ship. The equations of six-degrees-of-motion (6DOF) that govern the tank-liquid are coupled with those that govern the 6DOF motion of the ship, and all of the equations are integrated simultaneously in the time domain using the Large Amplitude Motion Program (“LAMP”). LAMP is a three-dimensional time-domain simulation of the motion of ships in waves. The unstabilized and stabilized roll motions of a S60-70 ship with forward speed and beam waves have been analyzed. For high-amplitude waves, the variation of the roll angle with the encounter-wave frequency exhibits typical nonlinear phenomena: a shift in the resonance frequency, multi-valued responses, and jumps. The performance of passive tanks on a S60-70 ship with forward speed is investigated in an irregular sea with different encounter-wave directions. It is found that passive anti-roll tanks tuned in the nonlinear range are very effective in reducing the roll motion. The effect of the tank mass and distribution of tank tubes on the performance of the tank system is studied. Also, it is found that passive anti-roll tanks are very effective in reducing the roll motion in sea state five of a ship whose pitch frequency is nearly twice its roll frequency.

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“…Usual controls for draught, roll stabilisation, dynamic positioning and control of nonlinear oscillations require detailed dynamic models for reaching high-quality performance (Youssef et al, 2002;Gawad et al, 2001;Fajinmi and Brown, 1999;Aamo and Fossen, 1999). Also stability analysis of nonlinear dynamics demands parameterised models in order to apply modern mathematical tools (Kreuzer et al, 2002;Gottlieb and Yim, 1993;Umar and Datta, 2003;Gottlieb and Yim, 1997;Kim and Bernitsas, 2001).…”

mentioning

confidence: 99%

Optimal identification of potential-radiation hydrodynamics for moored floating structures—a new general approach in state space

Jordan

Beltrán-Aguedo

2004

Ocean Engineering

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Design of passive anti-roll tanks for roll stabilization in the nonlinear range

Cited by 43 publications

References 6 publications

Application of Embedded Sensor Systems to Improve Safety for Container Ships in Cargo Loading or Unloading Operations

Application of Embedded Sensor Systems to Improve Safety for Container Ships in Cargo Loading or Unloading Operations

Roll Stabilization by Passive Anti-Roll Tanks Using an Improved Model of the Tank-Liquid Motion

Optimal identification of potential-radiation hydrodynamics for moored floating structures—a new general approach in state space

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