Computer controlled fins for improving seakeeping in marine vess

Details Computer controlled fins for improving seakeeping in marine vess Computer controlled fins for improving seakeeping in marine vess

1995-08-09

1996-04-30

Avila, Stephen

Ships

Displacement-type hull

Multiple hulls

114126, B63B 110

Patent

active

055115047

ABSTRACT:
A control system for a SWATH type vessel has control fins mounted on the pontoons of the vessel to improve seakeeping. The control system includes roll angle and pitch angle sensors, and can include roll rate and pitch rate sensors or calculations for developing damping signals, with all the signals used to control the control fins to counteract roll and pitch. In addition, individual accelerometers are provided mounted to the vessel in a sufficient number and at sufficently diverse locations to sense vertical acceleration of the vessel, and vertical acceleration signals are used to control the control fins to provide improved control of roll and pitch, and also to counteract any heave or vertical movement of the vessel. Additionally, draft sensors are provided mounted to the vessel to generate draft or depth of immersion signals. These signals override the roll, pitch and heave signals to cause vertical movement of the vessel to counteract incipient slamming or broaching of the vessel. If desired, a predetermined threshold for draft discrepancies can be provided before any such overriding control is initiated.

REFERENCES:
patent: 3727572 (1973-04-01), Nelson et al.
patent: 4095547 (1978-06-01), Benington
patent: 5282763 (1994-02-01), Dixon
patent: 5301624 (1994-04-01), Hall et al.

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