OVERVIEW

The course ship stability is fundamental for a naval architect, providing the basis to study the equilibrium and stability of a body immersed in a fluid. The following sections show the objectives and program of the course.

AIMS AND CONTENT

LEARNING OUTCOMES

The aim of the course is to provide knowledge of the concepts and issues regarding the buoyancy , balance and stability of a floating body .

AIMS AND LEARNING OUTCOMES

The course provides the knowledge and tools to be able to evaluate the geometric characteristics of a hull and set up and solve the problem of the equilibrium of the system of forces consisting of the weight force and buoyancy force, with particular attention to the stability of equilibrium.

In particular, the first part of the course is devoted to the definition of geometric elements necessary for the problem (surface of the iso-volume centers of buoyancy and its equations); the second part of the course is devoted to equilibrium equations and the evaluation of stability; the third part of the course is aimed at particular applications (eg loading and unloading a weight, moving a weight, etc.) and some advanced topics.

TEACHING METHODS

The course is composed by theoretical lectures and courseworks.

Teaching mode will be defined during the year, considering the status of COVID emergency.

SYLLABUS/CONTENT

Elements of ship geometry (Ship hydrostatics, Bonjean diagrams, Cross curves)

Hydrostatics (Archimedes' Theorem, Buoyancy, center of bouyancy, Weight, center of gravity, Equilibrium, Stability of equilibrium)

Geometry (Axis and plane of inclination, Reference axes, Euler's theorem, Iso-volume inclinations, Surface of the iso-volume centers of buoyancy, General equations of the iso-volume centers of buoyancy, Approximate equations of the iso-volume centers of buoyancy, Metacentric equations, cylindrical floating bodies, Particular case of the ship (symmetry and consequences)): for this, consider PNA

Equilibrium and stability (General equations of equilibrium, Special cases (transverse or longitudinal inclination), Metacentric method, Method of cylindrical floating bodies, Stability of equilibrium, Metacentric height, Stability moment, Inclining moments, Static and dynamic equilibrium)

Applications (Loading and unloading a weight, Moving a weight, Suspended loads, Liquid loads, Sliding loads, Typical inclining moments (wind, turning))

​Advanced topics (Meteorological criterion, Inclination test, damaged conditions, hull subdivision)

RECOMMENDED READING/BIBLIOGRAPHY

“Principles of Naval Architecture” SNAME

“Appunti di Disegno Navale” Prof. Carlo Podenzana-Bonvino

Other notes provided during lectures

TEACHERS AND EXAM BOARD

Exam Board

MARCO FERRANDO (President)

STEFANO GAGGERO

DIEGO VILLA

MICHELE VIVIANI

NICOLA PETACCO (President Substitute)

GIORGIO TANI (President Substitute)

LESSONS

LESSONS START

https://corsi.unige.it/8721/p/studenti-orario

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

The student learning is assessed on the base of a profit exam composed by a written and an oral test.
There are three examinations for students in the summer session (June, July and September) and two in the winter session (January and February).
In addition to this, there are some further exams for students not in the due course.
The written test consists of an exercise related to the equilibrium and stability problems of the ship illustrated during the course.
Candidates must have for the exam checkered protocol sheets, pens, pencils, eraser and other drawing tools, as well as a calculator. Use of notes is allowed, and laptops or mobile phones are not allowed.
The results of the written test are published on AulaWeb, usually 5-7 days after the written date, depending on the number of participants.
The oral exam consists of one or two questions on topics covered during lectures.

ASSESSMENT METHODS

The written test aims to ascertain the ability to solve engineering problems which can be faced in two to three hours, with the use of simple calculation means (calculator with the four operations and simple mathematical functions), focusing attention on the classic problems of ship stability.
The oral exam consists of one or two questions on topics covered during lectures.
The combination of answers in the oral exam and the written test allow to ascertain whether the student has acquired the notions and techniques illustrated during the lessons.

Exam schedule