Simulation-based analysis method for damage survivability of passenger ships

Abstract

A new approach for analysing the level of survivability for a passenger ship in the event of a collision damage is presented. Monte Carlo simulation is used for generating a large number of damage cases. The probability distributions for damage extent and location are based on the current SOLAS regulation. Each case is calculated with time-domain flooding simulation, assuming quasi-static motions and calm sea, thus enabling evaluation of the righting lever curve during the flooding process. The ship survivability is analysed based on requirements for a sufficient reserve stability. The proposed method is demonstrated with a large passenger ship design. Based on the detailed investigation of the results, the effects of various design changes are studied. Furthermore, the impact of waves on the flooding process is studied. The presented method for survivability assessment is robust and especially suitable for comparing design variations, or ships with similar main dimensions. ARTICLE HISTORY

Effect of Database Generation on Damage Consequences’ Assessment Based on Random Forests

“…Usually, the damage is modeled as a parallelepiped box intersecting the hull [21][22][23]. With such an assumption, the surface of the hull shell enclosed in the damage box is removed to define the damage.…”

A framework for onboard assessment and monitoring of flooding risk due to open watertight doors for passenger ships

“…Consequently, the computation time can be very long, up to several hours for one initial condition. More advanced survivability assessment, such as time-domain flooding simulation - [76] -would further increase the computation time. This means that for practical applications onboard a ship, less computationally demanding calculations, along the lines of the method presented in the following sections, are necessary.…”

Critical damages identification in a multi-level damage stability assessment framework for passenger ships

“…Therefore, the survivability of passenger ships is a relevant attribute for the design of new vessels [22][23][24], influencing the consequent operational risk and mitigation measures [5]. However, the probabilistic calculation frameworks accepted and applied by designers for the attained survivability index assessment [25] employ static calculations [26] or simplified quasi-static methods [27], whilst more advanced and direct methodologies employing rigid-body time domain simulations are used mainly in the academy [28]. That is because, principally, passenger ship designers apply the damage stability studies outcome with a compliant-based approach and are threatened by the computational time required by complex flooding simulations.…”