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Wave-Induced Vertical Motions and Bending Momentsin Damaged Ships

journal of Marine Science and Application 2018年第3期17卷 389-405页

作者： A.Mikulic j.parunov C.Guedes Soares Faculty of Mechanical Engineering and Naval Architecture University of Zagreb10000 ZagrebCroatia Centre for Marine Technology and Ocean Engineering (CENTEC) Instituto Superior Tecrtico Universidade de Lisboa 1049-001 LisboaPortugal

The wave-induced vertical ship motions and bending moments of a double hull-oil tanker in realistic flooding conditions are studied. The scenarios investigated are represented by water ingress into the starboard ballast tanks for collision damage cases and both starboard and portside ballast tanks for grounding situations. Seakeeping computations are performed for eight damage scenarios and for the intact condition, each corresponding to different changes in displacement, trim, and heel. For each of the damage conditions, transfer functions of vertical motions and loads are calculated using a potential linear 3 D panel hydrodynamic code in the frequency domain that includes effect of the motion of the water in flooded tanks. A MATLAB code is developed to facilitate automated hydrodynamic simulation of many damage scenarios. Verification of seakeeping results is performed by comparing transfer functions with results of the previous study. Wave-induced vertical responses of damaged ship are then compared to those of intact ship using two spectral-based methods originating from uncertainty analysis of wave loads, which are convenient tools to assess consequences of damage on short-term ship responses. Generally, observed trend is that vertical wave-induced responses of damaged ship converge toward those of intact ship with increasing wave period. Fairly small differences between responses of asymmetrically damaged ship with respect to the symmetrical incoming wave directions are found. The results of the study are an efficient method for seakeeping assessment of damaged oil tankers and the framework for evaluating consequences of damage scenarios, heading angles, and sea conditions on seakeeping responses of damaged *** results can be used to decide if the intact ship model can be used instead of the damaged one for the emergency response procedure or for the risk assessment studies when modeling and computational time represent important limitations.

关键词： Oiltanker Collision Grounding Seakeeping-Wave-bendingmoments Emergencyresponse Uncertainty analysis

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非均匀腐蚀的小尺度试件应力集中的数值分析

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journal of Marine Science and Application 2021年第1期20卷 1-9页

作者： j.Kodvanj Y.Garbatov C.Guedes Soares j.parunov Faculty of Mechanical Engineering and Naval Architecture University of ZagrebZagrebCroatia Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal

A numerical evaluation of stress concentrations of corroded plate surfaces of small-scale corroded steel specimens is compared with the experimentally estimated *** specimens were cut from a steel box girder,which was initially corroded in real seawater *** surface of all corroded specimens was analysed applying photogrammetry techniques,and a statistical description of an idealised corroded surface of each specimen was *** lives of specimens are determined from the fatigue *** on experimentally obtained fatigue lives,the stress concentration factors are calculated concerning the ideally smooth *** correlation between the statistical parameters of the corroded specimen surfaces and the estimated stress concentration factors is *** corroded surfaces,converted in graphical format,are then used for the finite element modelling in ABAQUS software,and stress concentration factors are estimated from the finite element results.A convergence study is performed to determine the appropriate finite element mesh *** between experimentally obtained and numerically estimated stress concentration factors is performed as well as correlation analysis between actual and finite element predicted crack locations.

关键词： Fatigue life Fatigue tests Corrosion Stress concentration factors Finite element method

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