On board measurement of stresses and deflections of a Post-Panamax containership and its feedback to rational design

Okada, Tetsuo; Takeda, Yu; Maeda, Tomoki

doi:10.1016/j.marstruc.2006.09.001

Cited by 27 publications

(7 citation statements)

References 3 publications

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“…The 'atmosphere' boundary as indicated in Figure 1 has the total pressure set to zero, i.e. p d + 1 2 rjUj 2 = 0, with p d defined as…”

Section: Validation By Comparison With Experimental Resultsmentioning

confidence: 99%

“…1 At present, the main design loads on merchant ship hulls are based on rules developed by the classification societies. These rules do not explicitly take into account slamminginduced whipping loads.…”

Section: Introductionmentioning

confidence: 99%

“…Slamming-induced hull girder whipping is known to lead to significant contributions to the extreme hull girder loads for large ships in heavy seas. 1 At present, the main design loads on merchant ship hulls are based on rules developed by the classification societies. These rules do not explicitly take into account slamminginduced whipping loads.…”

Section: Introductionmentioning

confidence: 99%

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Numerical prediction of slamming loads

Seng

Jensen

Pedersen

2012

Proceedings of the Institution of Mechanical Engineers, Part M:

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It is important to include the contribution of the slamming-induced response in the structural design of large vessels with a significant bow flare. At the same time it is a challenge to develop rational tools to determine the slamming-induced loads and the prediction of their occurrence. Today it is normal practice to apply a standard sea-keeping procedure to determine the relative velocity distribution between the water surface and the hull and then to estimate the bottom slamming loads and the bow-flare slamming loads based on two-dimensional formulations similarly to water-entry problems. The pressure distribution as well as the total force is then determined by integration over a pseudo-threedimensional presentation of the hull geometry.In this paper the evaluation of the slamming load is taken one step further by performing direct three-dimensional, fully non-linear numerical calculations in a realistic wave environment.Both the global and the local slamming loads are assessed numerically using a finite-volume formulation with the free surface captured by a volume-of-fluid technique. This numerical procedure is justified by comprehensive validation studies where numerically evaluated slamming pressures are compared with experimentally measured results.To obtain an insight into the three-dimensional flow effects the next step is to apply the validated numerical procedure to evaluate and compare the accuracy and performance of the traditionally used two-dimensional formulations by a comparison with three-dimensional numerical formulations for a fine-form Panamax container ship bow hitting a flat water surface at a constant trim angle.Finally, the slamming evaluation is carried out on the basis of a three-dimensional case study of the same container ship sailing in a head sea at half the service speed in a critical wave episode which is defined conditional on a given extreme response level of the hull girder bending moment.

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“…The 'atmosphere' boundary as indicated in Figure 1 has the total pressure set to zero, i.e. p d + 1 2 rjUj 2 = 0, with p d defined as…”

Section: Validation By Comparison With Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical prediction of slamming loads

Seng

Jensen

Pedersen

2012

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…As an early example of a full-scale measurement campaign of large container ships, Okada et al [1] performed full-scale measurements of a post-Panamax container ship during the three years from 1999 to 2002. They reported that the presence of whipping stress doubles the fatigue damage.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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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“…Large modern containerships are also becoming wider and less slender. The wave induced torsion and horizontal bending are believed to have significant impact on the global structure stress [8,9]. Further, the non-linear effects becoming essential for the wave load analysis.…”

Section: Introductionmentioning

confidence: 99%