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## SHIP STABILITY

CODE 101123 2020/2021 9 credits during the 1st year of 10948 MARITIME SCIENCE AND TECHNOLOGY (L-28) GENOVA ING-IND/01 English GENOVA (MARITIME SCIENCE AND TECHNOLOGY) 2° Semester AULAWEB

## OVERVIEW

The course deals with the ship buoyancy and stability, with a specific focus on the operational life of the ship. Topics are going to be treated both from a theroetical and a practical point of view. The matter plays a siginficant  role in the context of ship safety.

## AIMS AND CONTENT

### LEARNING OUTCOMES

The course provides knowledge about the buoyancy and the stability of ships, both in intact and damaged conditions, with appropriate reference to relevant IMO regulations. Specific attention will be given also to some operational aspects e.g. to cargo handling and stowage.

### AIMS AND LEARNING OUTCOMES

The course enables the capability of:

Evaluate  the ship equilibrium in a specific laoding condition and the evaluation of the relevant stability as well;

Prrevent dangerous situations in relation with shift and lift of weights, liquid free surface and inclining effects

Understand the basic physics of a ship in damaged condition

Understand the stability requirements for a ship in intact or damage condition

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### TEACHING METHODS

Lectures in classroom;

assignements, practical applications during the semester.

### SYLLABUS/CONTENT

• Introduction to the concept of safety;  FLAG STATE, PORT STATE, IMO (Conventions and Codes), IACS
• First order moments (of area, mass,…)
• Moment of inertia - second order moments (or area, mass,…)
• Introduction to lines plan – offset
• Hydrostatics
• Bonjean Tables
• Cross Curves
• Archimedes Principle
• The calculation of the ship weight
• Shift of weights on board
• The ship equilibrium
• The metacentric methodology for the ship equilibrium calculation
• Euler’s theorem
• The nature of equilibrium: ship stability
• Metacentric height
• Comments on the roll period
• Righting moment and righting arm
• Heeling moment due to the shift of weight in the transverse plan (Y,Z)
• Wind heeling moment
• Heeling moment due to turning at high speed
• Free surface correction
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• Lightship weight evaluation
• Inclining test
• Intact Stability code
• IS Code – specific focus on weather criterion
• The constant displacement method for the evaluation of the equilibrium condition of a ship in damages condition
• The addition of weight method for the evaluation of the equilibrium condition of a ship in damages condition
• Floodable length curve and permissible length curve
• Deterministic SOLAS requirements
• Probabilistic SOLAS 2009
• Grounding

The IMO safety rules relevant to the intact and damaged ship stability that are available on aulaweb.

## TEACHERS AND EXAM BOARD

### Exam Board

PAOLA GUALENI (President)

NICOLA PETACCO

FEDERICO SILVESTRO (President Substitute)

## LESSONS

### TEACHING METHODS

Lectures in classroom;

assignements, practical applications during the semester.

### LESSONS START

In compliance with the scheduling of the semester defined by the Polytechnic School.

### Class schedule

All class schedules are posted on the EasyAcademy portal.

## EXAMS

### EXAM DESCRIPTION

Written test + oral test.

Written test: assignement about basic application of ship hydrostatics and stability (practical calculations)

Oral test: two open questions about topics developed in classroom during the semester

To pass the written test is a pre-requisite to be admitted to the oral test.

### ASSESSMENT METHODS

With the written test, the students will be requested to give evidence of capability to apply in practice the theorethical methodologies with the proper critical attitude toward results.

Questions of the oral test are aimed to assess the capability of the students to discuss about theorethical and practical aspects of ship hydrostatics and stability.

Specific attention will be given to the capability of indicating the basic assuptions together with the input data, the target of the procedure and its rational developement.

### Exam schedule

Date Time Location Type Notes
21/01/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
03/02/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
17/02/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
15/06/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
29/06/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
20/07/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.
15/09/2021 09:30 GENOVA Orale Two written assignments are to be delivered five days before the date of the oral exam, in order to be admitted to the oral exam. The assignments have been described in details during the semester and the text is available on aulaweb. The contents of the assignment are going to be discussed during the oral exam.