Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

SSG(X) Design – VT Team 3 Page 31
3.3 Ship Synthesis Model
The ship synthesis model (see Figure 26) defines and balances designs selected by the optimizer and assesses
their feasibility, effectiveness, risk, and cost. The ship synthesis model in Model Center (MC) integrates modules
written in Fortran using file wrappers and input\output files for each module. The modules were modified and
updated specifically for optimization of the SSG(X) platform. One of the main tasks of the synthesis model is to
balance the design (see Figure 27). The Weight Module calculates lead weight based on an estimation of the hull
volume (provided by the Hull Module) and an estimation of the weights for the various SWBS groups (calculated in
the Weight Module). The amount of lead weight is calculated to achieve balance in Condition A. Lead weight is
the slack variable in the optimization and balance. It must be within specified limits for feasibility.
Figure 26 - Ship Synthesis Model in Model Center (MC)
The Ship Synthesis Model is organized into the following modules:
• Input Module: Stores the design variable values and other design parameters which are provided as
input to the other modules.
• Combat Module: Sums payload characteristics (weights, vertical centers of gravity (VCGs),
arrangeable areas, and electric power consumption) using the combat system alternatives selected and
an Excel file containing data for each system. The weights, arrangeable areas and electric power
consumption are simple summations; vertical centers of gravity are calculated using moments of
weights. The combat module outputs weights summarized by SWBS groups as well as a total,
arrangeable area, power consumption, and the required payload outboard volume.
• Propulsion Module: Calculates propulsion and generator system characteristics (weights and stowage
volumes) using the propulsion “subsystems” (propulsion system, propulsor type, battery type)