Accuracy requirements for positioning a vessel in the near shore
area have increased in recent years. To meet these requirements
several electronic positioning systems have been developed. One
such system is the Cubic Autotape Model DM-40. The Autotape is a
circular positioning system which utilizes the phase comparison
between transmitted...
These notes on Bonding and DC systems for boats summarize recommendations made at a series of Sea Grant workshops held between 1974 and 1978. The workshops were conducted by Don A. Cunning, instructor of marine electronics, Ketchikan Community College. The notes were prepared by Edward Kolbe of the OSU Sea...
The rapid advancement of electrical science has led it to invade
the field of marine engineering. On ship-board, all ship's lights,
search lights and signal lights are entirely electric. Of power appliances
outside of uses on men of war,ship's ventilation is completely
electric; electric deck winches and boat cranes are...
In high voltage direct current(HVDC) systems
transmission technology, a.c. power is
converted(rectified) to d.c. power by means of a
controlled rectifier bridge. This d.c. power is then
transmitted through a d.c. link to another
converter(inverter) where it is converted back to a.c.
power by means of another controlled rectifier bridge....
Switch-mode power supplies (SMPS's) not only convert energy, they also consume it. Typical operational efficiencies are approximately 25 to 60% for linear power supplies, and approximately 50-90% for switching power supplies. This means that products whose end-use electronics are dc, such as televisions and DVD players, could consume 50% less...
In the past two years, Oregon State University (OSU) Corvallis campus suffered several power outages. The estimated cost of one of those outages was close to a million dollars worth of equipment and impact on research projects. Meanwhile, the campus grid operates with severely aging power assets. The reliability of...
Determining the performance characteristics of various ocean wave energy converters (OWEC) has proven to be difficult due to problems replicating a baseline motion profile in the ocean or wave tank to compare these devices. The linear test bed seeks to mechanically simulate the relative linear motion between the active components...