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Publicações
Mikulic, A., Parunov, J. e Guedes Soares, C. (2018), “Wave-induced vertical motions and bending moments in damaged ships”, Journal Marine Science and Application, Vol. 17, pp. 389-405
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 port side ballast tanks for grounding situations. Seakeeping computations are performed for 8 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 3D 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 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. The results of the study are not only an efficient method for seakeeping assessment of damaged oil tankers but also the framework for evaluating consequences of damage scenarios, heading angles and sea conditions on seakeeping responses of damaged ships. The results can be used to decide if, and in which circumstances, the intact ship model can be used instead of the damaged one for the emergency response procedure or for the risk assessment studies when modelling and computational time represent important limitation.
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