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

2014 ◽  
Author(s):  
K Ouchi ◽  
◽  
Y Tanaka ◽  
A Taniguchi ◽  
J Takashina ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Container Ship ◽  
Air Drag ◽  
Large Container

scholarly journals Design and Performance Evaluation of Superstructure Modification for Air Drag Reduction of a Container Ship

2015 ◽  
Vol 52 (1) ◽  
pp. 8-18 ◽  
Author(s):  
Yoonsik Kim ◽  
Kwang-Soo Kim ◽  
Seong-Wook Jeong ◽  
Seung-Gyu Jeong ◽  
Suak-Ho Van ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Drag Reduction ◽  
Container Ship ◽  
Air Drag ◽  
And Performance

Structural Brittle Crack Arrest Design for Ultra Large Container Ship

2012 ◽  
Vol 81 (6) ◽  
pp. 485-488
Author(s):  
Masanobu TOYODA ◽  
Tsunehisa HANDA
Keyword(s):  
Crack Arrest ◽  
Container Ship ◽  
Brittle Crack ◽  
Large Container

scholarly journals Nonlinear bending moments of an ultra large container ship in extreme waves based on a segmented model test

2022 ◽  
Vol 243 ◽  
pp. 110335
Author(s):  
Ying Tang ◽  
Shi-Li Sun ◽  
Rui-Song Yang ◽  
Hui-Long Ren ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Model Test ◽  
Container Ship ◽  
Bending Moments ◽  
Extreme Waves ◽  
Nonlinear Bending ◽  
Segmented Model ◽  
Large Container

Extreme Value Statistics of Large Container Ship Roll

2016 ◽  
Vol 60 (02) ◽  
pp. 92-100
Author(s):  
Oleg Gaidai ◽  
Gaute Storhaug ◽  
Arvid Naess
Keyword(s):  
Nonlinear Behavior ◽  
Extreme Value Statistics ◽  
Ship Motions ◽  
Primary Concern ◽  
Container Ship ◽  
Highly Nonlinear ◽  
Extreme Response ◽  
Measured Time ◽  
Time Histories ◽  
Large Container

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.

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

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.

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

2011 ◽  
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.

Dynamic Analysis of Floating Bodies Considering Multi-Body Interaction Effects

2010 ◽  
Author(s):  
Young-Bok Kim ◽  
Moo-Hyun Kim ◽  
Yong Yook Kim ◽  
Young-Hun Kim
Keyword(s):  
Positioning System ◽  
Container Ship ◽  
Simulation Studies ◽  
Effective Solution ◽  
Floating Bodies ◽  
Dynamic Positioning System ◽  
Mobile Harbor ◽  
Effective Operation ◽  
Large Container ◽  
Multi Body

Recently, there are several problems in space, infra-structure, and facility in the contiguity of existing harbors due to the trend of enlarged container vessels. In this regard, the Mobile Harbor has been proposed conceptually as an effective solution for those problems. This concept is a kind of transfer loader of the containers from the large container ship to the harbor on land, which is a floating barge of a catamaran type. The catamaran-type vessel is well known for its advantage in maneuverability, resistance, and the effectiveness for working on board. For the safe and effective operation of the two floating bodies, a container ship and the mobile harbor in the near sea apart from the quay, robot arms, novel crane systems, and pneumatic fenders are specially devised with additional mooring facility or DP (dynamic positioning) system. The concept is to be verified through comparison and simulation studies under various environmental conditions. It is shown that the proposed concept is in general feasible but there are several areas for further investigation and improvement.

scholarly journals Impact of waste heat recovery systems on energy efficiency improvement of a heavy-duty diesel engine

2017 ◽  
Vol 38 (3) ◽  
pp. 63-75 ◽  
Author(s):  
Zheshu Ma ◽  
Hua Chen ◽  
Yong Zhang
Keyword(s):  
Energy Efficiency ◽  
Diesel Engine ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Reduction Factor ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Container Ship ◽  
Large Container

Abstract The increase of ship’s energy utilization efficiency and the reduction of greenhouse gas emissions have been high lightened in recent years and have become an increasingly important subject for ship designers and owners. The International Maritime Organization (IMO) is seeking measures to reduce the CO2 emissions from ships, and their proposed energy efficiency design index (EEDI) and energy efficiency operational indicator (EEOI) aim at ensuring that future vessels will be more efficient. Waste heat recovery can be employed not only to improve energy utilization efficiency but also to reduce greenhouse gas emissions. In this paper, a typical conceptual large container ship employing a low speed marine diesel engine as the main propulsion machinery is introduced and three possible types of waste heat recovery systems are designed. To calculate the EEDI and EEOI of the given large container ship, two software packages are developed. From the viewpoint of operation and maintenance, lowering the ship speed and improving container load rate can greatly reduce EEOI and further reduce total fuel consumption. Although the large container ship itself can reach the IMO requirements of EEDI at the first stage with a reduction factor 10% under the reference line value, the proposed waste heat recovery systems can improve the ship EEDI reduction factor to 20% under the reference line value.

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