Page 22: of Maritime Reporter Magazine (November 1988)

96th SNAME

Annual Meeting — A Preview (continued) ing a routine voyage was analyzed using system identification tech- niques. This resulted in a reliable "measurement" of the full scale re- sistance, wake friction, thrust de- duction factor, propeller thrust and the linear and nonlinear coefficients in the maneuvering equations of motion. Comparison between these full-scale measurements and those obtained through scaled model tests indicate significant scale effect. 3 p.m.—"The Building and Op- eration of Vibration-Free and Trou- ble-Free Propulsion Plants and

Ships," by G.C. Volcy, M. Baudin and C. Guinard.

Over the last 30 years, a tremen- dous growth in problems with pro- pulsion plant seizures, often accom- panied by steel-work and machinery troubles, has been linked to incom- patibility between ship structure flexibility and stiffness of line- shaftings manifested by forced vi- brations. Simultaneous treatments of static and vibratory phenomena by use of 3-D FEM calculations has eliminated these difficulties. Sev- eral examples are presented.

Asea Brown Boveri service has the speed and skill to keep the ball in the air.

Mercury Ballroom 9 a.m.—"Flexural Response of

Foam-Cored FRP Sandwich Pan- els,' by Deborah Weissman-

Berman, George L. Petrie and

Mo-Hwa Wang.

The flexural response of an FRP foam-cored sandwich beam is pre- dicted using two new closed form solutions and a finite element mod- el. The comparative results are very good for all predictive methods for thick-skinned composites and all have excellent correlation to test data for both "linear" and cross- linked" sandwich-core materials.

Therefore, the methods given in this paper will work well for composite structural analysis. 10:30 a.m.—"Statistical Analy- sis of Stillwater Load Effects in

Ship Structures," by C. Guedes

Soares and T. Moan.

Collecting data from the voyages of 100 vessels, this paper performs a statistical analysis of Stillwater bending moment and shear forces to establish the variations of the maxi- mum stillwater load effects that oc- cur during operation of oceangoing ships. Identifying the effects of ves- sel size, type, and loading condition in addition to providing summary statitics, regression equations are proposed along with considerations due to longitudinal distribution of vessel load. 3 p.m.—"Potential Failure of

Surface Ship and Submarine Dry- dock Blocking Systems Due to Seis- mic Loadings and Recommended

Design Improvements," by Rich- ard D. Hepburn, James K.

Luchs Jr., Dale G. Karr and

Ross L. Haith.

Many naval shipyards are located in regions where significant earth- quakes occur. A method for analyz- ing the dynamic response of sub- marine drydock blocking systems is developed. Eleven systems are as- sessed for various failure modes us- ing two site specific earthquake ac- celeration histories. Design im- provements are recommended to significantly increase the survivabil- ity of submarine blocking systems subjected to earthquake ground mo- tion.

Friday, November 11

Trianon Ballroom 9 a.m.—"Structural Analysis of the U.S. Coast Guard Island Class

Patrol Boat," by Edward S. Pur- cell, Stephen J. Allen and Rich- ard T. Walker.

The U.S. Coast Guard recently deployed several 110-foot patrol boats of the Island Class. A struc- tural analysis of the bottom plating of the vessel was conducted, includ- ing traditional calculations, finite element modeling, reliability analy- sis, tank testing, field testing and pressure calculations. Recommen- dations for structural improvements are made and data processing tech- niques are discussed. 10:30 a.m.—"A Procedure for the Structural Design of Icebreakers and Other Ships Navigating in Ice," by John C. Daidola and Rubin

Sheinberg.

Reflecting the rising worldwide interest in icebreaking, this paper puts forth an original approach to (continued) <• Circle 126 on Reader Service Card

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