Page 53: of Maritime Reporter Magazine (April 15, 1981)
To Make Power From Ocean
Waves." Mr. Sherburne is the project manager for the DAM-
ATOLL Project at the Lockheed
Space and Missile Company in
The author explained that the concept was derived by its in- ventor recalling an obscure World
War II report of the inability of the planners of an invasion to find a leeward side of an atoll to effect a landing. It made no difference which side was ap- proached, there were always waves breaking on the beach.
From this observation it was de- duced that the linear wave fronts were bending around the atoll thereby causing waves to land on the beaches at all points of the compass.
DAM-ATOLL derives its name from DAM—a barrier to control the flow of water, and ATOLL—a ring-shaped coral island and its associated reef. The DAM-ATOLL is a project investigating the con- version of ocean wave energy into electrical power. Unlike most oth- er ocean wave energy systems that attempt to convert the wave motion into electrical energy using mechanical motion mechanisms,
DAM-ATOLL converts the ener- gy from the wave into electrical energy directly.
A hemisphere, approximately 100 meters in diameter (the
ATOLL), focuses the wave en- ergy into the center of the struc- ture. The hemisphere provides an artificial beach, causing the waves to break, and at the same time curving the linear wave front completely around the structure.
The top of the structure is set at a precise level with the surface of the water, causing the wave breakers to "crash" into vanes (the DAM) at the center of the
ATOLL. The vanes convert the wave energy into a circular mo- tion in a cylinder 30 feet in di- ameter and 60 feet high. This circular motion forms a large hy- draulic flywheel, which turns a 10-15 rpm turbine located at the bottom of the cylinder. The tur- bine will be connected by shaft- ing to a generator located above the water at the top of the DAM.
The development of the DAM-
ATOLL is currently passing from the feasibility stage to the devel- opmental stage and appears to hold great promise in an age of rising fuel prices and increasing energy demands. It is envisioned that DAM-ATOLLs can be lo- cated offshore any land mass where waves having a minimum height of 2-3 meters are pre- valent.
Past chairman Phil Finkelstein was called on to conduct the in- stallation of the newly elected of- ficers to guide the Section through the next 12 months. They are: chairman, Capt. J.A. Gildea, USN; vice chairman, Capt. R.H. Ran- dall, USN; secretary-treasurer,
Gerald A. Bowles; and councilors
Lt. Larry St. John, USN, Calvin
Jolly, and Edwin J. Petersen.
April 15, 1981
New Catalog Describes
Turbine Generator Sets
Coppus Engineering Corpora- tion's new catalog is a compre- hensive presentation of its com- plete line of synchronous, induc- tion, and dc turbine generator sets up to 2,500 kw. Cost-saving applications are covered in detail and illustrated with charts, dia- grams, and photographs of typi- cal TG set configurations. An- other section is devoted to cus- tom-engineered sets for special applications — gas expander tur- bine drives, unique dual-drive tur- bine, ac dc sets, and "no-break" turbine-motor generator sets.
Major components are pre- sented separately and include: features of Coppus turbine driv- ers up to 4,000 hp; specifications of synchronous, induction and dc generators up to 2,500 kw; gear reducer drives; NEMA A, NEMA
D, and electric turbine speed con- trol governors; basic NEMA 1 control panels for synchronous and induction generator sets ; plus add-on components required for manual and automatic opera- tion of synchronous generators used in parallel, non-parallel, and standby applications.
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