1524. Algorithmic Mass-Factoring of Finite Element Model Analysis and Update: Grid – Density Sensitivity

Paper

Abstract

Cut and Splice is a weight estimating method for repeat design and modified repeat design of naval
ships where a change in length of the original design is necessary. Beginning with the highest level
of detail weight available for the design, usually a Final Weight Report, expressed in one of the
U. S. Navy’s accounting systems, BSCI or SWBS, and in the format for use with the ‘Ship Design Weight
Estimate’ (SDIJE) computer program, the original details are manipulated with the aid of the high
speed computer to simulate cutting the ship at a specific longitudinal point, shifting all weight aft
of that cut plane a specific distance, and filling the void space created by the shift with a homogeneous
length of ship. The resultant ship inherits the design philosophy incorporated into the original ship.
Where many potential changes to the original design will be contemplated, a unit length insert for each
functional section of the ship may be derived so that the weight and moment impact of any change anywhere
in the ship can be assessed when the true length increase becomes known.