Surface-ship fuel savings with an optimized autopilot. Master's thesis

Technical Report · Sun Dec 01 00:00:00 EST 1985

OSTI ID:5762257

In this thesis, the propulsion losses, which are caused by added drag due to steering of the ship, can be minimized by using an Adaptive Automatic Optimal Controller. It is shown that this Controller is capable of providing fuel savings in excess of 0.5% over a well-tuned PID controller when operating at the design speed at random headings in sea states. A new approach was used in finding fuel savings without using the engine specifications. It is shown that the second-order forces and moments create drift motions along the surge, sway, and yaw axes. As a consequence of this, the second-order forces and moments cause more fuel consumption than the first-order forces and moments cause more fuel consumption than the first-order forces and moments, which create only oscillatory ship motions along this axis. So the sea state in the deterministic model is represented by the first-order and second-order forces and moments.

• Research Organization: Naval Postgraduate School, Monterey, CA (USA)
• OSTI ID: 5762257
• Report Number(s): AD-A-164216/4/XAB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
PROPULSION SYSTEMS
FUEL CONSUMPTION
SHIPS
ENERGY CONSERVATION
DRAG
ENGINES
EQUATIONS OF MOTION
FUNCTIONS
LOSSES
MATHEMATICAL MODELS
MOTION
OPTIMIZATION
SPECIFICATIONS
DIFFERENTIAL EQUATIONS
ENERGY CONSUMPTION
EQUATIONS
PARTIAL DIFFERENTIAL EQUATIONS
320204* - Energy Conservation
Consumption
& Utilization- Transportation- Sea & Water