Model Experiments of Ship Capsize in Astern Seas

Hamamoto, Masami; Enomoto, Takashi; Sera, Wataru; Panjaitan, James P.; Ito, Hiroto; Takaishi, Yoshinori; Kan, Makoto; Haraguchi, Tomihiro; Fujiwara, Toshifumi

doi:10.2534/jjasnaoe1968.1996.77

Cited by 10 publications

(5 citation statements)

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“…Therefore, capsizing in following and quartering waves with relatively high speeds should be investigated on the basis of a multi-degrees-offreedom system. The authors have conducted free-running model experiments for several ship models at a seakeeping and manoeuvring basin to examine ship stability criteria and operational guidance (Umeda et al 1995a(Umeda et al , 1999Hamamoto et al . 1996).…”

Section: Introductionmentioning

confidence: 99%

Capsize of ship models in following/quartering waves: physical experiments and nonlinear dynamics

Umeda

Hamamoto

2000

Philosophical Transactions of the Royal Society of London. Seri

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This paper presents experimental records for capsizing of ship models in following and quartering seas. Recorded capsizes have been classi ed into four modes: broaching, low cycle resonance, stability loss on a wave crest, and bow diving. Nonlinear dynamics were applied to broaching and low cycle resonance to reveal their qualitative and quantitative characteristics. For other modes, further investigation based on nonlinear dynamics should be encouraged.

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Section: Introductionmentioning

confidence: 99%

Capsize of ship models in following/quartering waves: physical experiments and nonlinear dynamics

Umeda

Hamamoto

2000

Philosophical Transactions of the Royal Society of London. Seri

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“…For example, Grochowalski (1989) noted that scale-model ship behavior exhibited only minimal differences between regular waves and a sequence of three or four consecutive large waves occurring within a long-crested irregular seaway. Similarly, Hamamoto et al (1996) stated that capsizing of a model occurred when it encountered a wave group which consisted of several especially steep waves, essentially equivalent to large regular waves. In fact, the concern with regular wave testing for capsize might be that it excites capsize too frequently.…”

Section: Introductionmentioning

confidence: 99%

“…Grochowalski (1989) noted similar tendencies of capsize, particularly that quartering seas were more dangerous for capsize than beam seas. Hamamoto et al (1996) did extensive model tests looking at capsize and classified conditions under which harmonic resonance, parametric resonance, and pure loss of stability lead to ship capsize. Sadat-Hosseini et al (2011) undertook a coupled experimental and numeric investigation of surf-riding, periodic motion, and broaching in which they numerically simulated these dynamic stability events using regular waves.…”

Section: Introductionmentioning

confidence: 99%

Multidisciplinary experiment using steep regular waves to determine ship operating conditions that avoid capsize

Klamo

2018

Multiscale and Multidiscip. Model. Exp. and Des.

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This paper explores using steep regular waves to identifying safe operating conditions that avoid capsize. The data is from a multidisciplinary experiment using an autonomous scale-model running a proportional-derivative controller in aft of beam steep regular waves. The test explored relative wave headings from 15 • to 75 • and speeds from 0.1 to 0.4 Froude number. This effort analyzes the resultant ship trajectories to determine if the model obtained the desired operating conditions during each run. For slow speeds, safe operating conditions could not be identified since the requested headings could not be achieved. For moderate speeds, most requested headings could be achieved. At the highest speeds, only relative wave headings closer to beam seas could be explored as the model capsized in stern quartering waves. Results show that wavelength and wave steepness have minimal effects on the model's ability to achieve a desired heading. Finally, only a limited number of runs are required to verify a safe operating condition since capsizes appear to be consistently repeatable. This research highlights the usefulness of using steep regular waves for capsize testing but also some of its limitations.

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“…It is noted that comparative studies between free running and towed model experiments have shown acceptable agreement (IMO, 2006). Broaching experiments were carried out by De Kat and Thomas (1998b), Hamamoto et al (1996), Umeda (1998), Umeda et al (1995Umeda et al ( , 1999Umeda et al ( , and 2008, and Lilienthal et al (2007). De Kat and Thomas (1998b) and Hamamoto et al (1996) observed broaching caused by large amplitude yaw motion due to wave impinge on the ship from behind and broaching caused by singe wave.…”

Section: Literature Review On Efdmentioning

confidence: 99%

“…Broaching experiments were carried out by De Kat and Thomas (1998b), Hamamoto et al (1996), Umeda (1998), Umeda et al (1995Umeda et al ( , 1999Umeda et al ( , and 2008, and Lilienthal et al (2007). De Kat and Thomas (1998b) and Hamamoto et al (1996) observed broaching caused by large amplitude yaw motion due to wave impinge on the ship from behind and broaching caused by singe wave. Umeda (1998) and Umeda et al (1995Umeda et al ( , 1999 proposed systematic method to assess ship stability in quartering/following waves executing free running test.…”

Section: Literature Review On Efdmentioning

confidence: 99%

CFD prediction of ship capsize

Hosseini¹,

Hamid²

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Stability against capsizing is one of the most fundamental requirements to design a ship. In this research, for the first time, CFD is performed to predict main modes of capsizing. CFD first is conducted to predict parametric rolling for a naval ship. Then CFD study of parametric rolling is extended for prediction of broaching both by using CFD as input to NDA model of broaching in replacement of EFD inputs or by using CFD for complete simulation of broaching. The CFD resistance, static heel and drift in calm water and static heel in following wave simulations are conducted to estimate inputs for NDA and 6DOF simulation in following waves are conducted for complete modeling of broaching. CFD parametric rolling simulations show remarkably close agreement with EFD. The CFD stabilized roll angle is very close to those of EFD but CFD predicts larger instability zones. The CFD and EFD results are analyzed with consideration ship theory and compared with NDA. NDA predictions are in qualitative agreement with CFD and EFD. CFD and EFD full Fr curve resistance, static heel and drift in calm water, and static heel in following waves results show fairly close agreement. CFD shows reasonable agreement for static heel and drift linear maneuvering derivatives, whereas large errors are indicated for nonlinear derivatives. The CFD and EFD results are analyzed with consideration ship theory and compared with NDA models. The surge force in following wave is also estimated from Potential Theory and compared with CFD and EFD. It is shown that CFD reproduces the decrease of the surge force near the Fr of 0.2 whereas Potential Theory fails. The CFD broaching simulations are performed for series of heading and Fr and results are compared with the predictions of NDA based on CFD, EFD, and Potential Theory inputs. CFD free model simulations show promising results predicting the instability boundary accurately. CFD calculation of wave and rudders yaw moment explains the

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Model Experiments of Ship Capsize in Astern Seas

Cited by 10 publications

References 0 publications

Capsize of ship models in following/quartering waves: physical experiments and nonlinear dynamics

Capsize of ship models in following/quartering waves: physical experiments and nonlinear dynamics

Multidisciplinary experiment using steep regular waves to determine ship operating conditions that avoid capsize

CFD prediction of ship capsize

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