CUVX Design Report - the AOE home page - Virginia Tech

CUVX Design – VT Team 2 Page 90Figure 86. Personnel Speed-polar Plot for Roll in Sea State 7The performance degradation criteria for personnel are 8 degrees roll and 3 degrees pitch. Crew on the bridgemust only be subjected to 0.2g lateral acceleration and 0.4g vertical acceleration. Figure 86 is a Speed Polar plotshowing the operating envelope for personnel in Sea State 7. The limiting criterion in Sea State 7 is roll. Theacceptable operating range requires a heading of 030-330 (following seas) or 150-210 (head seas).Hull sea keeping criteria are 30 bow submergences per hour, and 20 slams per hour. CUVX can performlimited operations in Sea State 7. Slamming at Station 3 is the limiting criterion. The contours for slams/hour in SeaState 7 are plotted on the Speed-polar plot in Figure 79. The acceptable operating range requires a heading of 100-270.4.13 Cost and Risk Analysis4.13.1 Cost and ProducibilityCost calculations for CUVX HI3 are based on weight and producibility. These calculations are shown in Figure87. The cost is analyzed for each SWBS group by weight and multiplied by a producibility factor. With the latestiteration of the design some variables differ from the original values in Concept Exploration. These changes resultin a lower cost than originally estimated. A comparison of the costs is shown in Table 52. These acquisition costssatisfy the threshold values as specified in the ORD, but because this is a very high end ship, they are well abovecost goals.CUVX HI3 is a producible design. Its hull form has significant parallel midbody. A chine at the waterlinetransitions the curved wetted surfaces to a low-curvature freeboard. The entire hull above the waterline consists ofsingle curvature or flat plating as does the transom. The Advanced Double Hull uses cell production techniques.The centerline skeg also uses single curvature plate. The cost of outfitting and installation is reduced by generousdeck heights and the use of zonal distribution systems for electric power, firemain and ventilation. The variety ofstructural materials (plate and shapes) was kept to a minimum.