Accession Number : AD0682591

Title :   DEVELOPMENT OF MATHEMATICAL MODELS FOR DESCRIBING SHIP STRUCTURAL RESPONSE IN WAVES.

Descriptive Note : Technical progress rept. no. 1, Apr 66-Jan 68,

Corporate Author : OCEANICS INC PLAINVIEW N Y

Personal Author(s) : Kaplan,Paul

Report Date : JAN 1969

Pagination or Media Count : 50

Abstract : Available mathematical models that describe ship-wave interactions are evaluated in order to develop a technique for predicting ship structural response characteristics. Major consideration is given to the bending moment and slamming responses for an arbitrary ship form in any state of sea, at any relative heading and forward speed. The slowly varying vertical and lateral bending moments due to waves are obtained using a linearized model based on strip theory, where the effect of roll motion and its influence in the lateral plane are included, with the model sufficiently general to also allow extension to computation of torsional moments due to waves. Comparison of the results of a limited series of hand computations with available experimental data indicates a good degree of agreement, as well as an overall consistency, for the analysis of wave-induced bending moments. A mathematical representation of the bending moment due to slamming is also described, and computational procedures for obtaining an output compatible with the wave-induced bending moment are outlined. Methods of analysis in terms of power spectra as well as time histories are considered, and the utility of different types of computers for presentation of information on ship structural response is described. (Author)

Descriptors :   (*SHIP HULLS, *HYDRODYNAMICS), MATHEMATICAL MODELS, OCEAN WAVES, RESPONSE, INTERACTIONS, BENDING, MOMENTS, IMPACT SHOCK, SHIP STRUCTURAL COMPONENTS, POWER SPECTRA

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE