Hullborne Hydrofoil Six-Degree-of-Freedom Motion Prediction and Computer Program - Zero Speed Case

摘要

Modifications were made to motion prediction computer program for a hullborne hydrofoil in waves to include the zero speed case. The program can now be used to compute the six-degrees-of-freedom (6DOF) hullborne hydrofoil craft motions for a craft speed of zero as well as for a constant forward speed, less than the critical 'lift-off' speed, with arbitrary heading in regular waves. Basically, the program consists of the already existing 'DTNSRDC 6DOF Ship-Motions and Sea-Loads Computer Program' (AD-A008 335), which computes the motions of hulls in the displacement mode, with appropriate modifications to incorporate the effects of the submerged foil system on craft motions. Presented in this report are a discussion of the mathematical model for the zero craft speed case, input information pertaining to the hydrofoil system, and a discussion of the results. The Appendices present a listing of the program update cards and the subroutines pertaining to the foil system.