Evaluation of Motions of Marine Craft in Irregular Seas 



Z(t) 



^(t) 10 



Fig. 13 - Deterministic solution of heave and pitch motions 

 of hydrofoil craft in irregular head seas 



The procedures provided in this paper have been shown to be successful in 

 predicting the motions and bending moments of surface ship models, and the 

 motions of hydrofoil craft and submerged bodies in irregular long-crested 

 waves. Hence the technique is also expected to be directly applicable to other 

 features attending the operation of marine craft in a seaway, i.e., deck wetting, 

 bow slamming, acceleration, etc. 



ACKNOWLEDGMENT 



The authors would like to acknowledge the contributions made to the pres- 

 ent subject by Mr. John F. Dalzell during his employment at the Davidson Labo- 

 ratory, Stevens Institute of Technology. Miss W. Jacobs has contributed valu- 

 able assistance in resolving certain of the details of the mathematical analysis. 



493 



