Sommario
Viene presentata una breve descrizione delle metodologie attuali più seguite per la identificazione di un modello matematico atto alla previsione delle caratteristiche di manovrabilità di una nave. Utilizzando coefficienti idrodinamici ricavati da prove su modelli in scala si è sviluppato un codice di calcolo che consente di ottenere la risposta della nave in alcune manovre standard quali quelle di evoluzione e zig-zag.
Summary
A brief review of the most important existing mathematical models for predicting the manoeuvring performance of a ship at the design stage is presented. A model based on the derivation of the hydrodynamic coefficients from force measurements on scale models is used to develop a computer program for the evaluation of the ship performance in some standard manoeuvres such as turning circle and zig-zag manoeuvres.
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Abbreviations
- G :
-
Center of gravity
- g :
-
Acceleration due to gravity
- I ZZ :
-
Moment of inertia aboutz-axis
- i EP :
-
Effective moment of inertia about propeller axis
- L :
-
Length between perpendiculars
- m :
-
Ship mass
- N :
-
Hydrodynamic moment aboutz-axis
- n :
-
Rate of revolutions of propeller
- O :
-
Origin of shipbound coordinate system
- Q :
-
Propeller torque
- Q E :
-
Engine torque
- q F :
-
Engine fuel rate
- R T :
-
Total hull resistance
- r :
-
Rate of turn aboutz-axis (yaw rate)
- U :
-
Along-track velocity of0
- u, v :
-
Components ofU alongx, y-axes
- X, Y :
-
Hydrodynamic forces alongx, y-axes
- x,y,z :
-
Shipbound coordinate axes
- x G ,y G ,z G :
-
Coordinate of center of gravity in the shipbound system
- x o,y 0,z 0 :
-
Coordinate of 0 in the earthbound system, Fig. 1
- β :
-
Drift angle
- δ:
-
Rudder angle
- τ :
-
Characteristic time
- ψ :
-
Heading angle
References
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Eminente, C., Coppola, C. Computational evaluation of ship manoeuvring performance based on scale model tests. Meccanica 25, 195–198 (1990). https://doi.org/10.1007/BF01556442
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DOI: https://doi.org/10.1007/BF01556442