METHOD OF PREDICTION OF PHASE STATE OF SHIP Russian patent published in 2004 - IPC

FIELD: methods based on use of phase coordinates of ship: angular velocity and angle of trim and programmed disturbing and control forces acting on ship. SUBSTANCE: proposed method includes supply of disturbing and control forces to input of electron model of ship working in accelerated time scale. Generated at its output are predicted magnitudes of angular velocity and angle of trim and expected time moment ≪T_prog≫. At moment ≪T_o≫, signals proportional to said forces acting from moment ≪T_o≫ to moment ≪T_prog≫ are furnished to model input. Signals of predicted magnitudes of angular velocity and angle of trim generated at model output are compared with their tolerances: in case they exceed tolerance, malfunction signal is furnished to operator and prediction process is discontinued; in case signals do not exceed tolerance, measured phase coordinates of ship are considered to be initial magnitudes of angular velocity and angle of trim in time interval ≪τ≫ at time moment ≪T_o+τ≫ and are introduced to input of model together with signals proportional to said forces acting from moment ≪T_o+τ≫ to moment ≪T_prog≫. Predicted phase coordinates picked off output of model are compared with tolerances. In case they do not exceed tolerance, magnitude of coefficient of ship motion model is defined more accurately in next time interval ≪τ≫ at moment ≪T_o+2τ≫; at measurement of running speed of ship, signal proportional to programmed total magnitude of disturbing and control forces is compared with actual magnitude of action of resultant force. It is obtained through measurement of acceleration and angular velocity of ship at ≪T_o+2τ≫. Difference thus obtained is introduced to model input. Measured magnitudes of angular velocity and angle of trim are considered to be initial magnitudes which are introduced to model input together with signals proportional to disturbing and control forces acting from moment ≪T_o+2τ≫ to rated moment ≪T_prog≫. Predicted magnitudes of angular velocity and angle of trim generated at model output are compared with tolerances. In case they are within tolerance, cycles of calculations of predicted angular velocity and predicted angle of trim are repeated at time moments ≪T_o+2τ≫, ≪T_o+3τ≫, ≪T_o+nτ≫, similarly to moment ≪T_o+2τ≫, EFFECT: enhanced accuracy. 1 dwg