Pacific Northwest Section Hears Paper On Application Of Seakeeping Analysis

Ninety members and guests of the Pacific Northwest Section of The Society of Naval Architects and Marine Engineers recently attended a regular meeting held in Pier 91 Officers' Club, Seattle, Wash.

After dinner, a technical paper titled "Application of Seakeeping Analysis" was presented by Bruce L. Hutchison and J. Thomas Bringloe, naval architect and vice president, respectively, of L.R.

Glosten & Associates Inc.

The authors stated that the basic purpose of the paper is to utilize the theoretical tool of modern seakeeping analysis in an approach to the solution of some shipboard engineering problems.

Deterministic and stochastic processes were explained, the latter being the current vehicle for the study of seakeeping, the historical development of which was traced from Sir Isaac Newton to the present state-of-the-art.

The study, analysis and prediction of ship motions takes place in the time, frequency and probability domains which are analagous to the different projections of the same object as drawn by the draftsman, each revealing salient features not observable in others.

The above theory incorporates the use of tabulations of observed sea states as reported by ships.

Several excellent publicly available, high-speed, computer programs are used by the practicing engineer at moderate cost which, together with his own post processing program, will manipulate the basic response data into forms which directly answer his questions.

Ship motions program "SCORES" and post processing program "CARGO" are being utilized by the authors.

In conclusion, the application of the foregoing analytical tool has been used by the authors' company in providing the best engineering techniques involving peculiar cargo stowage problems for such items as process plant modules or drilling platforms.

Other applications are the development of operating instructions or design criteria for ballasting of vessels, design analysis of heavy lift arrangements with particular reference to offshore construction operations, sailing instructions for a particular voyage or even real-time routing during the voyage. These are but a few of the potential applications for seakeeping analysis.

Copies of the paper can be obtained from the Section Librarian, C.S. Bracken, P.O. Box 24382, Seattle, Wash. 98124.

Maritime Reporter Magazine, page 16,  Mar 1978

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