Page 14: of Maritime Reporter Magazine (April 1986)
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ASNE Day (continued) bow and stern. Designs of one of the authors, Mr. Ingvason, are de- scribed and discussed. His twin- skeg, integrated hull design concept, which combines good hydrodynamic features with producibility, is ana- lyzed by model testing in compari- son to a recent U.S. Navy tanker design, the T-AO-187 Class. Gains on the order of 15 percent at the ship's design speed are predicted.
Major producibility concepts and features are also discussed. These concepts capitalize on the experi- ence of several Swedish shipyards. 3:15 pm—"Ship Design Computer
Programs—An Interpolative Ap- proach," by Kenneth S. Brower and Kenneth W. Walker.
Naval ship design synthesis com- puter programs, the original devel- opment of which was pioneered by the U.S. Navy, are now used by the
Navy to conduct feasibility design studies and to conduct reverse engi- neering analyses of foreign ships.
The use of these computer programs has substantially reduced the time and cost of conducting feasibility design trade-off studies and has al- lowed the ship design to develop very accurate design solutions that can be effectively used as the basis for preliminary and contract de- sign.
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The paper describes an interpola- tive technique for the ship design that the authors have developed and incorporated in a variety of ship design synthesis computer pro- grams. This interpolative technique shortcuts the classic and time-con- suming design spiral approach to conducting ship design studies. 4:00 pm—"Structural Design
Methods for Surface Ships Operat- ing at the Ice Edge," by James R.
Meyer and James St. John.
Commercial oil exploration in the
Arctic has stimulated a wealth of research programs on ice conditions, ice properties, and ice interaction with both structures and ships over the past 10 to 15 years. While much of the commercial research has been proprietary, many fine papers have been written to put some of the information into the public do- main.
Government agencies such as the
Maritime Administration, the Ship
Structure Committee, and the Ca- nadian Ministry of Transport have sponsored multiyear programs to gather valuable data pertinent to ship design in the Arctic, both to stimulate domestic shipbuilding and provide regulatory guidelines.
This paper attempts to bring to- gether appropriate pieces of this re- search to address the ship design problem for a vessel operating at the ice edge.
Session 2B—Diplomat Room
Maintenance
Moderator: Capt. Donald L. Hof- fer, USCG
Assistant: Capt. James W. Kehoe
Jr., USN (Ret.) 2:30 pm—"Assessment of Remain- ing Useful Life of Ship Service Tur- bine Generator Steam Chests," by
J.D. Byron, S.R. Paterson, R.R.
Proctor, and T.J. Feiereisen.
During the recent overhaul of an aircraft carrier, cracks were found in many of the eight ship service tur- bine generators. These units have had a history of cracking in the steam chest and steam passages as do other carriers. In the past, the cracks were ground and the units returned to service. During this overhaul, an in-depth analysis of the cracking problem was conducted that included: a detailed inspection of the units, a review of the startup procedure and comparison of it to industry practice, a test of thermo- couples, a nonlinear stress and frac- ture mechanics analysis, and a rec- ommendation for revised repair or operating procedures.
The results of this work showed that cracking would be confined and would not extend to a critical size prior to the next overhaul period, cracks need not be removed, and, in fact, removal of cracks would result in a degraded remaining service life.
Results also showed that the life could be significantly enhanced with the use of a steam bypass to preheat the steam chest before startup. 3:15 pm—"An Expert System for
Real-time Noise and Vibration
Analysis of Shipboard Equipment," by Steven K. Klein, Jeannine A.
Vail, and Kevin Balon.
This paper describes an expert
Maritime Reporter/Engineering News
