REAL-TIME FORECASTING OF FUTURE SHIP MOTION

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$452,100.00
Award Year:
1990
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
6526
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Systems Technology Inc.
2672 Bayshore Pkwy - Ste 505, Mountain View, CA, 94043
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Warren F Clement
(415) 961-4674
Business Contact:
() -
Research Institution:
n/a
Abstract
THE DESIGN, DEVELOPMENT, AND IMPLEMENTATION OF A REAL-TIME METHOD TO FORECAST FUTURE QUIESCENT INTERVALS IN SHIP MOTION IS PROPOSED FOR V/STOL AIRCRAFT RECOVERY OPERATIONS ABOARD AIR-CAPABLE SHIPS. THE METHOD USES ONLY MEASURED SHIP MOTIONS AND PROVIDES A RATIONAL BASIS IN TIME-OPTIMAL CONTROL THEORY FOR ESTABLISHING REQUISITE FORECASTING INTERVALS. THE FORECASTING TECHNIQUE IS BASED ON CONTINUOUS REAL-TIMEIDENTIFICATION OF THE SINUSOIDAL AMPLITUDES AND PHASE ANGLES IN THE RANGE OF FREQUENCIES THAT CHARACTERIZE THE ENCOUNTERED MODAL PERIOD OF MOTIONS, REPEATED SAMPLING OF SHIP MOTIONS, AND FAST-TIME INTEGRATION OF SEVERAL HIGHER DERIVATIVES OF MOTION COUPLED WITH MEASURED INITIAL CONDITIONS. THE MOTION FORECAST METHOD HAS BEEN VALIDATED IN THE LABORATORY IN REAL TIME WITH RECORDED TIME HISTORIES OF ACTUAL SHIP MOTIONS. THE NECESSARY SHIP MOTION MEASURING TECHNIQUES, SENSORS, AND COMPUTER PROGRAMS FOR OPERATIONAL REAL-TIME SHIP MOTION FORECASTING ARE DESCRIBED. A PROGRAM IS PROPOSED FOR ASSESSING THE ACCURACY OF THE FORECASTING AS A FUNCTION OF THE PREDICTION INTERVAL, THE ACCURAY OF THE ESTIMATED SINUSOIDAL AMPLITUDES AND PHASE ANGLES IN THE RANGE OF FREQUENCIES THAT CHARACTERIZE THE ENCOUNTERED MODAL PERIOD, AND THE ACCURACY OF THE SENSED AND SAMPLED SHIP MOTIONS.

* information listed above is at the time of submission.

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