Università degli Studi di Napoli "Parthenope"

Teaching schedule

Academic year: 
2019/2020
Belonging course: 
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

Education objectives: the main educational objectives of the course are related to the knowledge of the manoeuvring qualities and the factors that determine them. The course is focused on the steering and manoeuvring systems, on the ship’s characteristics that determine the manoeuvring ability and how they can change in shallow and/or restricted water, or in the presence of wind and current, highlighting the actions to be undertaken. Besides, the course deals with the issues related to the standard manoeuvres and the information obtained from them. The course also aims to provide the necessary elements for the description of the sea state and for the prediction of the ship's behavior in rough sea, from a theoretical, experimental and practical point of view. Besides, the correct interpretation of the main international Rules for the ship manoeuvrability and seakeeping is a further objective, which is reached by the analysis of the main international rules, the discussion of several case studies and the application to existing reference ships.
Knowledge and understanding: students shall prove to know the main topics related to the government and manoeuvring of the ship, as well as the ship’s seakeeping
Ability to apply knowledge and understanding: students shall prove to apply the acquired topics and theoretical proficiencies, required to evaluate the seakeeping, manoeuvrability and propulsion characteristics of the common types of ship.
Judgment autonomy: students shall autonomously evaluate and assess the ship seakeeping, manoeuvrability and propulsion characteristics applying the best resolutions to increase them.
Communicative Skills: students shall acquire the skill of presenting a numerical application about the analysis of standard manoeuvres simulated in laboratory.
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 Ship
geometry and stability Maths and Physics.

Syllabus

Motion’s equations: Course stability degrees; positions and ship motions; motion’s equations; external forces; linearized motion’s equations; the derivatives; non-dimensional derivatives; the decoupling of the sway and yaw equations; Nomoto indices; the intrinsic stability of the route and stability condition; the parameters on which stability depends; the Norrbin index; turning radius assessment and reduction; the theoretical and experimental derivatives’ evaluation; captive tests; tests with the planar motion mechanism; the non-linearized equations and the calculation of the route resulting from a manoeuvre.
Control and government systems: Active and passive devices; types of rudders; turning moment; rudder positioning; classical and alternative solutions for manoeuvring and propulsion; optimization of propulsive performance.
SEA TRIALS: The standard manoeuvres; the turning circle manoeuvre; the spiral and reverse spiral manoeuvres; zig-zag and zeta manoeuvres; the pull-out manoeuvre and the minimum standards for the straight-line stability; Williamson manoeuvre; manoeuvrability indices derived from standard manoeuvres; IMO Resolution A.601 and Res. MSC.137 (76); the pilot card; wheelhouse poster; manoeuvring booklet.
Characteristics of manoeuvring in narrow water and shallow water: effects of load condition, trim and speed on the ship manoeuvrability; manoeuvres in restricted waters; the effects of current and wind; shallow waters effect, sluggish movement and squat effect; interaction between ships and between ship and shores; under keel clearance; COLREG 72.
Description of the sea: wave motions; statistical analysis of irregular waves; Fourier analysis; Energy spectrum; spectral moments; theoretical spectra.
Ship seakeeping: Motion’s equations; restoring, dumping and added mass; wave exciting forces; assessment of natural periods; Strip theory; ship motions in regular waves; Response Operator Amplitude (RAO); transfer functions; absolute motions; related motions; ship motions in irregular waves; encountered waves spectrum; motions energy spectrum; experimental tests; nonlinearity and simulation in time domain; criteria for ship seakeeping; polar diagrams.

The course deals with the elements required to ensure the knowledge of the theoretical and practical fundamentals of the ships controllability, manoeuvre and seakeeping.
Particularly, the course furnishes the following competencies:
1: Knowledge of the control and manoeuvrability ship systems;
2: Optimization of the ship propulsive performance;
3: Effects of the displacement, draft, trim, speed and depth on the ship’s manoeuvrability;
4: Effects of wind and current on the ship’s manoeuvrability, squat effect in shallow water;
5: Turning circle and stopping distance;
6. Optimization of seakeeping characteristics in waves.
Further details about the acquired competencies are furnished in the extended version of the programme.

Teaching Methods

Frontal lessons, discussion of case studies, laboratory simulations

Textbooks

The teaching material consists of:
- - Reference books in Italian and English;
- - Technical Rules in English;
- - Lecture notes of all lessons

- ALBERTO FRANCESCUTTO, “Manovrabilità delle Navi”, Università di Trieste, 2004.
- EMILIO CASTAGNETO, “Il Governo della Nave”, Editore Pellerano del Gaudio, Napoli.
- 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.

Learning assessment

The exam consists of verifying the achievement of the previously defined
educational goals, by an oral examination during which students shall
discuss several plant schemes of existing ships, to evaluate the
autonomous capacity of reading and comprehension.

More information

Not applicable.