On the calculation of the righting lever curve for a damaged ship

Ruponen, Pekka; Manderbacka, Teemu; Lindroth, Daniel

doi:10.1016/j.oceaneng.2017.12.036

Cited by 21 publications

(13 citation statements)

References 17 publications

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“…Unfavorable weather conditions will, if encountered, further deteriorate the heeling of the ROPAX vessel. Due to the complicated matter of dynamic interactions, the floodwater motions, namely sloshing, may be important for wide rooms [37,38]. The studies concerning the floodwater effects on ship motions have been conducted [39,40] for years in a damage condition, while those concerning the firewater effects on ship motions are relatively rare and still required.…”

Section: Discussionmentioning

confidence: 99%

A Computational Approach to the Prediction of the Floating Condition of ROPAX Vessel after Firewater Accumulation in Firefighting Operation

Wang

2020

JMSE

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A reliable estimation of the floating condition of a roll on/roll off cargo (ROPAX) vessel after the accumulation of firewater on the vehicle deck is extremely important for making correct decisions on evacuation and abandonment. Thus, for the seafarer working on a ROPAX vessel, there is a demand for a time-dependent prediction of the floating condition of the vessel after the firewater accumulation. For this purpose, a new iterative computational approach, based on quasi-static theory, is presented. The approach is examined through the records observed in an accident of the M/V Dashun. The results show that the approach has good accuracy and feasibility provided that the actual heeling angle and cargo shift during the accident are carefully monitored.

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Section: Discussionmentioning

confidence: 99%

A Computational Approach to the Prediction of the Floating Condition of ROPAX Vessel after Firewater Accumulation in Firefighting Operation

Wang

2020

JMSE

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“…In the intermediate flooding phases, including all simulation time steps, the volumes of floodwater in the compartments remain constant during the calculation of the righting lever curve. This approach is described in detail in Ruponen et al [20]. The compartments in way of damage were always treated as lost buoyancy.…”

Section: Calculationsmentioning

confidence: 99%

Advanced Damage Stability Analyses for Design of Cargo Ships

Lindroth

Tompuri

Ruponen

et al. 2020

Lecture Notes in Civil Engineering

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While the development of stability regulations mainly has been driven by the needs for passenger ships, cargo ships are also getting an update in the newly adopted amendments to the Safety of Life at Sea (SOLAS) convention. The stability at intermediate flooding stages have previously been ignored for cargo ships, but if the ship is equipped with cross-flooding devices, intermediate filling phases will now be evaluated. In this study, the relevancy of these intermediate stages for cargo ships is investigated. The focus is on a case study of a short sea ro-ro cargo ship with cross-flooding ducts in the double bottom. In addition to the conventional regulatory calculation methods, also time-domain flooding simulation is used for realistic assessment of intermediate stages and the actual time-to-flood. Such tools have previously been used for damage stability analyses of passenger ships. The different calculation methods are compared against each other through the attained subdivision index. The results indicate that cross-flooding improves damage stability also for cargo ships, and that simulation is an applicable tool also for design and analysis of safer ships.

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“…Constant volume of floodwater in each flooded room is applied in the calculation of the righting lever (GZ) curve, Ruponen et al (2018). The GZ curve characteristics (range and GZ max ) for reserve stability analysis are calculated without the effect of external moments.…”

Section: Survivability Assessmentmentioning

confidence: 99%

Simulation-based analysis method for damage survivability of passenger ships

Ruponen

Lindroth

Routi

et al. 2019

Ship Technology Research

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A new approach for analysing the level of survivability for a passenger ship in the event of a collision damage is presented. Monte Carlo simulation is used for generating a large number of damage cases. The probability distributions for damage extent and location are based on the current SOLAS regulation. Each case is calculated with time-domain flooding simulation, assuming quasi-static motions and calm sea, thus enabling evaluation of the righting lever curve during the flooding process. The ship survivability is analysed based on requirements for a sufficient reserve stability. The proposed method is demonstrated with a large passenger ship design. Based on the detailed investigation of the results, the effects of various design changes are studied. Furthermore, the impact of waves on the flooding process is studied. The presented method for survivability assessment is robust and especially suitable for comparing design variations, or ships with similar main dimensions. ARTICLE HISTORY

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On the calculation of the righting lever curve for a damaged ship

Cited by 21 publications

References 17 publications

A Computational Approach to the Prediction of the Floating Condition of ROPAX Vessel after Firewater Accumulation in Firefighting Operation

A Computational Approach to the Prediction of the Floating Condition of ROPAX Vessel after Firewater Accumulation in Firefighting Operation

Advanced Damage Stability Analyses for Design of Cargo Ships

Simulation-based analysis method for damage survivability of passenger ships

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