Università degli Studi di Napoli "Parthenope"

Teaching schedule

Academic year: 
2015/2016
Belonging course: 
Course of Bachelor's Degree Programme on NAUTICAL AND AERONAUTICAL SCIENCES
Disciplinary sector: 
NAVAL ARCHITECTURE (ING-IND/01)
Language: 
Italian
Credits: 
9
Year of study: 
3
Teachers: 
Cycle: 
Second semester
Hours of front activity: 
72

Language

Italian

Course description

The course is designed to provide students with the knowledge of the theoretical and practical fundamentals of the controllability and manoeuvre of ships. The course also aims to provide the necessary elements for the description of the sea state and for the prediction of the behaviour of the ship in rough seas, from a theoretical, experimental and practical point of view.

Knowledge and understanding: Students shall prove to know the main topics related to the government and maneuvering of the ship and the motions induced in rough seas.

Ability to apply knowledge and understanding: students shall prove to apply the acquired topics and theoretical proficiencies, required to evaluate the maneuverability and seakeeping characteristics of the ship.

Judgment autonomy: Students shall autonomously evaluate and assess the ship maneuverability and seakeeping, applying the best resolutions to increase them.

Communicative Skills: Students shall acquire the skill of presenting a numerical application about the analysis of standard maneuvers simulated in laboratory, maneuvers numerical simulations and RAO definition from experimental tests applying a correct scientific language.

Learning Skills: Students shall be capable of continuously update their skills, by reading books, articles and rules (mainly in English), in order to acquire a good capacity of enhancing the own knowledge in the field of ship Maneuverability and Seakeeping..

Prerequisites

Even if not mandatory, it is suggested to have passed the exams of Architettura e Statica della Nave, Analisi Matematica I e Fisica I.

Syllabus

Ship manoeuvrability: ship's control system. Course stability degrees. Reference systems. Positions and ship motions. Switching from a reference system to another. Motion’s equations. The case of origin other than G. External forces. Motion’s equations in algebraic form. The linearized equations. The derivatives in non-dimensional form. The decoupling of the sway and yaw equations. Nomoto indices. The intrinsic stability of the route. The parameters on which stability depends. Advanced motion in drift. Advanced motion and gyratory motion. Advanced motion with transverse acceleration. Advanced motion with angular acceleration. The standard manoeuvres. The standards set by the IMO for manoeuvrability. The turning circle manoeuvre. The spiral manoeuvre (by Dieudonnè) and reverse spiral manoeuvres. Zig-zag and zeta manoeuvres. The pull-out manoeuvre and the minimum standards for the straight-line stability. Manoeuvrability indices. The Norrbin index. Indices derived from standard manoeuvres. Information recommended on board. IMO Resolution A.601 and Resolution MSC.137 (76). The pilot card. Wheelhouse poster. Manoeuvring booklet. Mechanical interpretation of the turning circle and rotation diameter. The theoretical determination of the coefficients of the linearized motion’s equations. The experimental determination of the coefficients of the motion’s equations. Captive tests. Tests with the mechanism of planar motion. The non-linearized equations and the calculation of the route resulting from a manoeuvre. Active and passive devices. Types of rudders. Rudders area. Rudder shape. Rudder positioning. Manoeuvres in restricted waters. Shallow water effects. COLREG 72 (regulation to avoid collisions at sea). Ship seakeeping: wave motions: origin and propagation of waves. Linear waves, nonlinear waves. Theory of potential waves. Analysis of a wave time series. Forecast of wave heights. Probability density function, Gauss distribution, Rayleigh distribution. Statistical analysis of irregular waves. Fourier analysis. Energy spectrum. Spectral moments. Theoretical spectra: Pierson-Moskowitz spectrum, Bretschneider spectrum, Jonswap Spectrum. ITTC recommendations. Reference systems and definitions. Motion’s equations. Forces acting on a ship. Linearized equations of motion. Hydrostatic forces. Hydrodynamic forces. Wave exciting forces. Added mass, restoring and dumping coefficients. Ship motions in still water. Approximate formulas for moments of inertia. Approximate formulas for natural periods of heave, pitch, roll. Strip theory. Two-dimensional calculation. Hydrodynamic coefficients. Ship motions in regular waves. Transfer functions. Absolute motions. Related motions. Velocities and accelerations. Ship motions in irregular waves. Encountered waves spectrum. Motions energy spectrum. Tests on models, tests in regular and irregular waves. Nonlinearity. Simulation in time domain. Criteria for ship seakeeping

Ship manoeuvrability: ship's control system. Course stability degrees. Reference systems. Positions and ship motions. Switching from a reference system to another. Motion’s equations. The case of origin other than G. External forces. Motion’s equations in algebraic form. The linearized equations. The derivatives in non-dimensional form. The decoupling of the sway and yaw equations. Nomoto indices. The intrinsic stability of the route. The parameters on which stability depends. Advanced motion in drift. Advanced motion and gyratory motion. Advanced motion with transverse acceleration. Advanced motion with angular acceleration. The standard manoeuvres. The standards set by the IMO for manoeuvrability. The turning circle manoeuvre. The spiral manoeuvre (by Dieudonnè) and reverse spiral manoeuvres. Zig-zag and zeta manoeuvres. The pull-out manoeuvre and the minimum standards for the straight-line stability. Manoeuvrability indices. The Norrbin index. Indices derived from standard manoeuvres. Information recommended on board. IMO Resolution A.601 and Resolution MSC.137 (76). The pilot card. Wheelhouse poster. Manoeuvring booklet. Mechanical interpretation of the turning circle and rotation diameter. The theoretical determination of the coefficients of the linearized motion’s equations. The experimental determination of the coefficients of the motion’s equations. Captive tests. Tests with the mechanism of planar motion. The non-linearized equations and the calculation of the route resulting from a manoeuvre. Active and passive devices. Types of rudders. Rudders area. Rudder shape. Rudder positioning. Manoeuvres in restricted waters. Shallow water effects. COLREG 72 (regulation to avoid collisions at sea). Ship seakeeping: wave motions: origin and propagation of waves. Linear waves, nonlinear waves. Theory of potential waves. Analysis of a wave time series. Forecast of wave heights. Probability density function, Gauss distribution, Rayleigh distribution. Statistical analysis of irregular waves. Fourier analysis. Energy spectrum. Spectral moments. Theoretical spectra: Pierson-Moskowitz spectrum, Bretschneider spectrum, Jonswap Spectrum. ITTC recommendations. Reference systems and definitions. Motion’s equations. Forces acting on a ship. Linearized equations of motion. Hydrostatic forces. Hydrodynamic forces. Wave exciting forces. Added mass, restoring and dumping coefficients. Ship motions in still water. Approximate formulas for moments of inertia. Approximate formulas for natural periods of heave, pitch, roll. Strip theory. Two-dimensional calculation. Hydrodynamic coefficients. Ship motions in regular waves. Transfer functions. Absolute motions. Related motions. Velocities and accelerations. Ship motions in irregular waves. Encountered waves spectrum. Motions energy spectrum. Tests on models, tests in regular and irregular waves. Nonlinearity. Simulation in time domain. Criteria for ship seakeeping.

Teaching Methods

Frontal lessons, discussion of case studies, laboratory simulations.

Textbooks

Carmine G. Biancardi, “Manoeuvrability and Safety of Ships”, Editore Createspace, www.amazon.it, 2012.
Alberto Francescutto, “Manovrabilità delle Navi”, Università di Trieste, 2004.
Emilio Castagneto, “Il Governo della Nave”, Editore Pellerano del Gaudio, Napoli.
Edward V. Lewis (Editor), “Principles of Naval Architecture – Vol. III”, published by SNAME.
Nabergoj R., “Fondamenti di Tenuta della Nave al Mare”, Trieste, 2011.
Bhattacharrya R., "Dynamics of Marine Vehicles", John Wiley & Sons, New York, 1978.
Lloyd, A.R.J.M., "Seakeeping: Ship Behaviour in Rough Weather", Ellis Horwood Limited, Chichester, 1989.
Course notes “Manovrabilità e Tenuta della Nave al Mare”, lecture notes are provided during the course.
The Regulations can be downloaded for free from the site: www.imo.org

Learning assessment

The exam consists of verifying the achievement of the previously defined educational goals, by an oral examination during which a numerical application is fully discussed.

More information

Not applicable