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At step 5, the propulsion system characteristics (power consumed, fuel flow, rpm, etc.) are evaluated at the remaining “off-design” speed/sea state conditions specified by the user. The electrical systems, auxiliary system and outfitting are designed. The boat’s structure is designed in Step 6. Here, both local and global loads are calculated and used with material properties for sizing the structural scantlings for adequate strength. These scantlings are used to estimate the weight of the boat’s structure. At Step 7, Weight Estimates, the calculated weights of all the boat’s systems and subsystems are added together to establish a calculated lightship weight. Subsequently, all boat’s loads are calculated and summed together. The boat arrangements are organized in Step 8. The required deck area and volume necessary to support all of the boat’s systems and loads are calculated and compared with the volume that is available in the boat’s hull. If the ship’s hull does not contain sufficient volume to satisfy the volume demand, the volume deficit is made up by increasing the size of the super-structure until the sum of the volume available in the boat’s hull and super-structure equals the total volume required. At Step 9, the intact stability of the generated design is assessed. This analysis uses the 3-D wireframe, developed in Step 2 to evaluate the righting arm throughout the heel angle range of 0 to 90 degrees. The area ratios and metacentric height calculated in the stability analysis are compared with the corresponding standards. Step 10 determines if a balanced design has been reached. Here, the full-load weight that was used to establish the hullform in Step 2 is compared with the full-load weight that was calculated in Step 7. If these two weights differ, then another iteration around the complete design spiral is performed, wherein; the hullform calculations are performed using the full-load gross weight calculated in the previous iteration. This iterative process is repeated, typically more than 15 times, until such time as the calculated full-load displacement at the end of iteration is within 0.5% of the full-load displacement that was used at the start of the iteration. (Kiss 1980) Once the balanced design has been established, the seakeeping behavior, the acquisition and the life-cycle cost of the design are determined, leading particulars of the design are printed. In most cases, subsystem weights are calculated and reported in the output at the three-digit level of detail. 14PDF Image | FIBER REINFORCED PLASTIC BOAT IN SERIAL PRODUCTION
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