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94th SNAME Annual Meeting future near-term developments are considered as well. A synopsis of recent oceanographic vessel con- struction, and user or scientific re- quirements for oceanographic ships are presented. General-purpose, geological, geophysical, and fisher- ies vessels are described. Paper No. 6—"Liquid Sloshing in Slack Ship Tanks: Theory, Ob- servations, and Experiments," by N.A. Hamlin, Y.K. Lou, W.M. Maclean, F. Seibold, and L.M. Chandras. ABSTRACT—Sloshing waves in partially filled oscillating rectangu- lar tanks are shown to agree well when determined experimentally, and by analysis using a nonlinear theory for smooth tanks, and a nu- merical simulation technique for tanks with two-dimensional obsta- cles. Cases of shipboard sloshing damage are cited. Model tests are given for sloshing forces on structur- al members, and sloshing pressures, in ship-like tanks with internal structure. Paper No. 7—"Research Plan for the Investigation of Dynamic Instability of Small High-Speed Craft," by Steven H. Cohen and Donald L. Blount. ABSTRACT—Small high-speed craft have been known to lose stabil- ity while under way even though they possess adequate stability at rest. Unstable conditions can in- clude rapid loss in running trim, progressive heeling, or sudden com- bined roll-yaw motion. The prirriary objectives of this paper are to focus attention on this little-understood problem, describe recent develop- ments, and present a long-range re- search plan. Paper No. 8—"Time-Simula- tion of Ship Motions: A Guide to the Factors Degrading Dynamic Stabili- ty," by N.M. Elsimillawy and N.S. Miller. ABSTRACT—A time-domain numerical simulation of the ship motions in regular sinusoidal waves in six degrees of freedom has been (continued) —A Preview PAPERS COMMITTEE Jack A. Obermeyer, Chairman Jack W. Abbott Steven G. Buttner Warren C. Dietz James F. Dunne Keith P. Farrell Jacques B. Hadler James A. Higgins Chester L. Long Peter M. Palermo Spencer Reitz Wm. duBarry Thomas Richard W. Thorp Jr. William E. Zimmie Circle 333 on Reader Service Card •> -I • • * -4v i v' " ' - 1 „ Of J » FRESHWATER AND SALTWATER CAPABILITIES ...IN A COMPETITIVE, QUALITY SHIPYARD! With access to the world's oceans through the St. Lawrence Seaway, Bay Shipbuilding is both a fresh- water and saltwater shipyard. Recognized as one of America's most progressive shipyards, Bay Shipbuild- ing has the facilities and capabilities to construct saltwater vessels up to 760' in length and Great Lakes vessels to 1,100' in length. Our facilities include 5 major building berths, 15 repair/outfitting berths, a 1,158' graving dock, 7,000-ton floating dry dock, 200- ton overhead gantry crane, plus numerical-controlled lofting and plasma burning equipment. Our highly-skilled workforce, with more than 80 years' experience in steam and diesel propulsion systems, is complemented by complete in-house capabilities to design, build, repair, convert, re-power, retrofit, and jumboize any type of vessel. Since 1902, Bay Shipbuilding has constructed a wide variety of vessels, including containerships, oil tankers, derrick ships, passenger ships, and stern trawlers. Bay Shipbuilding has also constructed more self- unloading vessels than any other shipyard in the Unit- ed States...and has converted numerous straight- bulk vessels to self-unloaders as well. Additionally, Bay Shipbuilding is equally qualified in all facets of barge construction as it has built tug/barge units, notch barges, hydro-dump barges, and self-unload- ing barges for the bulk, chemical, and petroleum industries. PUT BAY'S PROVEN RECORD OF EFFICIENCY, ON-SCHEDULE DELIVERIES, AND QUALITY WORKMANSHIP TO WORK FOR YOU ... BAY SHIPBUILDING CORP. Subsidiary of The Manitowoc Company, Inc. 605 North 3rd Avenue, Sturgeon Bay, Wl 54235 Phone: 414-743-5524 • Telefax: 414-743-2371 VISIT BAY SHIPBUILDING S BOOTH, NO. 925-927, AT THE SNAME INTERNATIONAL MARITIME EXPOSITION c BAY SHIPBUILDING CORP. 1986
