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

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SSG(X) Design – VT Team 3 Page 64 Figure 52 - ModelCenter File Figure 53 - Optimization Dialog Box The second phase of the analysis involves modeling the structure in the finite element program MAESTRO. The MAESTRO model (see Figure 54) is constructed according to the geometry described in 4.4.1 using the initial scantlings provided by the MathCAD calculations. Since the bulkheads and end caps are not the focus of this level of analysis, the bulkheads are modeled as king frames, and the end caps are modeled as bulkheads.
SSG(X) Design – VT Team 3 Page 65 Figure 54 - Pressure Hull Model in MAESTRO Once the geometry and composition of the structure is determined using the optimized results from ModelCenter, the loads are placed on the structure. The MAESTRO Solver analyzes the structure to determine adequacy. If inadequate structure is found, the structural model is modified by adjusting the plating thickness or frame scantlings. The iterative process of defining the structure, determining structural adequacy, and adjusting the scantlings is outlined in Figure 55. Geometry Components / Materials Loads Stresses 4.4.1 Geometry, Components and Materials Scantling Iteration Modes of Failure Figure 55 - Iterative Structural Design Process in MAESTRO Strength In the case of a non-nuclear submarine which has more outboard volume, external frames allow more arrangeable area within the pressure hull. These external frames can run through tanks which are enclosed by transverse outboard bulkheads; however, along the portion of the pressure hull which has outboard cylindrical hydride tanks, internal frames must be employed. It is desirable to isolate portions of the submarine which contain potential flood or fire hazards. The machinery room is considered both a fire and flood hazard; therefore, a watertight bulkhead forward is placed forward of the machinery room. The torpedo room is also considered a potential flood hazard; therefore, a watertight bulkhead is placed aft of the torpedo room. A general structural rule for bulkhead placements suggests a bulkhead or king frame
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Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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