Probabilistic subdivision index "A" (index-A) of SOLAS'2009 is used to assess the damage survivability of a designed vessel against the required survivability level, further maximising it as long as practicable. Due to complex relationship between subdivision design variables and index-A, manual tuning of index-A proves generally irrelevant and iterative computer algorithms have been applied. However, recent research results indicate that the optimised function behind index-A is highly irregular and the optimisation has to be very intensive to find the global optimum. As direct calculation of index-A is tedious, such an intensive optimisation becomes prohibitive in practice, satisfying with suboptimal subdivision designs as a result. In this paper we further develop a surrogate function of index-A for realistic subdivisions of passenger ships. This allows us replacing tedious calculations by quick and sufficiently accurate estimates index-A, so that the time for ship optimisation can be reduced by far.
展开▼
