THE ANALYTICAL PREDICTION OF SHIP PERFORMANCE IN RANDOM SEAS, INCLUDING A NEW CORRELATION OF THEORETICAL AND EXPERIMENTAL MODEL MOTIONS IN REGULAR WAVES,
Abstract
To determine the feasibility of evaluating seaworthiness performance along analytical lines, a systematic comparison is first made of experimentally measured and theoretically computed ship motions and phase angles. Tank data for a broad range of Series 60 models in regular waves are extracted from N.S.M.B. publications and correlated with model responses calculated by a digital computer program which is based on the Korvin-Kroukovsky linear theory of ship motions in conjunction with Grim's latest results on added mass and damping. Both directly ahead and astern seas are considered and emphasis is paid to the effects of variations of hull from parameters and weight distribution. It is concluded that with minor exceptions there is satisfactory correlation between the analytical and experimental results and recommendations towards further improvement are subsequently presented. An attempt is next made to formulate kinematical seaworthiness on a rational basis. To this end, the importance of pitching, vertical acceleration, slamming, wetness and propeller emergence is discussed. It is then shown how the above ship responses and seaworthiness phenomena can be analyzed and hence assessed on the basis of simple statistical parameters and criteria. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1964
- Accession Number
- AD0434563
Entities
People
- Lyssimachos Vassilopoulos
Organizations
- Massachusetts Institute of Technology