IRM determines the ship’s mission capability over time by simulating the ship’s systems, considering the interaction and dependencies of connected equipment, plant configuration, and crew actions over time.
Database Construction
A rigorous process is used to acquire ship system information, perform database verification, and vet modeled behaviors with subject matter experts (SMEs). Manuals, design drawings, and engineering notebooks are used to develop an initial representation of the ship. Standardized pre-process steps ensure all components have appropriate connections and attributes, populate cross indexing fields in the relational database, and calculate appropriate geometric translations for use by the fire and flooding models. Individual systems are run through a set of standardized regression tests to verify proper interaction behaviors between various types of components. Testing is conducted using a series of initial conditions and damage cases to determine system level response. This information is then shared with SMEs to elicit feed-back to modify model parameters as necessary. A readiness review is then held prior to proceeding with production runs.
The IRM software allows the user to create a database that contains the structural and system elements of the vessel. These systems are highly interdependent and provide resources needed to maintain mission capability.
Diagram shows the relational dependancy between various components used by the IRM.
Typical Structural Components:
• Compartment Data
- Name
- Location
- Type (passage, airlock, magazine, weather, etc.)
- Combustible Content (fire Class)
• Bulkhead and Deck Data
- Material (i.e. steel)
- Thickness
- Insulation
- Height, including any slope
- Size
- Bounding compartments
- Air and water leakage • Door and Hatch Data - Name - Location, including DC Locator - Type - Size (described as a rectangle) - Directional information (from/to) - Sill height - Transit times - Open/Close times - Transit count (number of people that can transit at once) - Air and water leakage • Three Dimensional Data - Imported from ASAP/3d CAD tool, such as Rhino - Communications Systems - Compressed Air Systems - Cooling Water Systems - Damage Control Systems (Fire Suppression, Fire Fighting, and Dewatering) - Data Systems - Fresh Water Systems - Fuel Oil Systems - Heating Systems - Lube Oil Systems - Network Systems - Personnel - Power Systems - Propulsion Systems - Refrigeration Systems - Sewage Systems
Typical System Components