- system/model should enable the analysis to be done at a few project stages.
From the practical point of view the computational model is based on the DYNAMICAL DATABASE (DDB) concept and it is original. The structure of DDB database is modular and it relates to the logical structure of the computational model. The DDB data base enables to provide the safety estimation when a ship hydromechanic characteristics are estimated using either the numerical calculations (direct methods), model tests results, results from the full scale trials, empirical and hydronumerical calculations (semi direct methods) or empirical calculations (indirect methods).
The ship and environment are defined as hydromechanic objects described by a set of parameters. The safety domains included in the "Hydromechanic Analysis" module are called the design methods using both the functions and procedures associated with solving particular hydromechanic problems.
The "Risk Assessment" module includes the methods that combine both the "hydromechanic" and "risk assessment" functions and procedures. The "Main Requirements" module may consists of the following:
- general requirements,
- IMO regulations,
- requirements of classification societies and
- requirements of conventions.
The current set of requirements used by the DDB database includes the IMO regulations. The DDB database should include both the risk acceptance criteria, safety objectives, main requirements and design criteria and constraints. These are the very important components of the computational model.
6. EXAMPLES
The method and model have been worked out towards their application at the preliminary stage of design.
Two separate design processes can be initiated:
- iterative approach;
- parametric-related investigations.
Current design options of the computational model are as follows:
- calculation of he "Attained Subdivision Index A";
- calculation of the "Local Subdivision Indices ΔAj";
- calculation of the "Probability of Oil Out-flow";
- calculation of the "Probability of Capsizing in Critical Conditions", when the IMO regulations are not used (direct risk assessment method).
