Eco-efficient marine power system with cooled air ventilation by waste LNG cold energy for reefer holds in an ultra-large container ship

The paper describes a method for prediction of large container ship extreme roll angles occurring during sailing in harsh weather. Rolling is coupled with other ship motions and exhibits highly nonlinear behavior. Risk of losing containers due to a large roll is primary concern for ship transport. Because of non-stationarity and complicated nonlinearities of both waves and ship motions, it is a considerable challenge to model such a phenomenon. In case of extreme motions, the role of nonlinearities dramatically increases, activating effects of second and higher order. Moreover, laboratory tests may also be questioned because of the scaling and the sea state choice. Therefore, data measured on actual ships during their voyages in harsh weather provide a unique insight into statistics of ship motions. The aim of this work is to benchmark state of art method, which makes it possible to extract the necessary information about the extreme response from onboard measured time histories. The method proposed in this paper opens up the possibility to predict simply and efficiently both short- and long-term extreme response statistics.

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A Study on Air Drag Reduction on the Large Container Ship in the Sea

10.3940/rina.con.2014.02 ◽

2014 ◽

Author(s):

K Ouchi ◽

◽

Y Tanaka ◽

A Taniguchi ◽

J Takashina ◽

...

Keyword(s):

Drag Reduction ◽

Container Ship ◽

Air Drag ◽

Large Container

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Statistical Analysis of Vertical and Torsional Whipping Response Based on Full-Scale Measurement of a Large Container Ship

Applied Sciences ◽

10.3390/app10082978 ◽

2020 ◽

Vol 10 (8) ◽

pp. 2978

Author(s):

Ryo Hanada ◽

Tetsuo Okada ◽

Yasumi Kawamura ◽

Tetsuji Miyashita

Keyword(s):

Sensor Data ◽

Future Research ◽

Container Ship ◽

Stress Monitoring ◽

Sea State ◽

Operational Conditions ◽

Hull Girder ◽

Future Design ◽

Vibrational Response ◽

Large Container

In this study, as a preliminary attempt to reveal the whipping response of large container ships in actual seaways, the stress monitoring data of an 8600 TEU large container ship were analyzed. The measurement lasted approximately five years, and using a large amount of data, we investigated how the sea state and operational conditions affected the whipping response. In addition, the midship longitudinal stresses were decomposed into hull girder vertical bending, horizontal bending, and torsional and axial components. Thereafter, we found that the whipping magnitude on the torsional and horizontal bending components is much smaller than that on the vertical bending component. Future research would include the analysis of a larger amount of data, analysis of other sensor data, and effects of various patterns of vibrational response on the ultimate strength and fatigue strength. The obtained results will benefit the future design and operation of large container ships for safer navigation.

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Experimental and numerical investigations on the ultimate longitudinal strength of an ultra large container ship

Ocean Engineering ◽

10.1016/j.oceaneng.2019.106546 ◽

2019 ◽

Vol 192 ◽

pp. 106546 ◽

Cited By ~ 6

Author(s):

Chonglei Wang ◽

Jiameng Wu ◽

Deyu Wang

Keyword(s):

Container Ship ◽

Numerical Investigations ◽

Longitudinal Strength ◽

Large Container

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Time Domain Analysis of Springing and Whipping Responses Acting on a Large Container Ship

Volume 6: Ocean Engineering ◽

10.1115/omae2011-49218 ◽

2011 ◽

Cited By ~ 1

Author(s):

Yongwon Lee ◽

Zhenhong Wang ◽

Nigel White ◽

Spyros E. Hirdaris

Keyword(s):

Time Domain ◽

Nonlinear Effects ◽

Time Domain Analysis ◽

Container Ship ◽

Wave Loads ◽

Ocean Engineering ◽

Hull Girder ◽

Engineering Research ◽

Large Container ◽

Element Method

As part of WILS II (Wave Induced Loads on Ships) Joint Industry Project organised by MOERI (Maritime and Ocean Engineering Research Institute, Korea), Lloyd’s Register has undertaken time domain springing and whipping analyses for a 10,000 TEU class container ship using computational tools developed in the Co-operative Research Ships (CRS) JIP [1]. For idealising the ship and handling the flexible modes of the structure, a boundary element method and a finite element method are employed for coupling fluid and structure domain problems respectively. The hydrodynamic module takes into account nonlinear effects of Froude-Krylov and restoring forces. This Fluid Structure Interaction (FSI) model is also coupled with slamming loads to predict wave loads due to whipping effects. Vibration modes and natural frequencies of the ship hull girder are calculated by idealising the ship structure as a Timoshenko beam. The results from springing and whipping analyses are compared with the results from linear and nonlinear time domain calculations for the rigid body. The results from the computational analyses in regular waves have been correlated with those from model tests undertaken by MOERI. Further the global effects of springing and whipping acting on large container ships are summarised and discussed.

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