CODE | 66397 |
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ACADEMIC YEAR | 2022/2023 |
CREDITS |
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SCIENTIFIC DISCIPLINARY SECTOR | ING-IND/02 |
LANGUAGE | English |
TEACHING LOCATION |
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SEMESTER | 2° Semester |
TEACHING MATERIALS | AULAWEB |
OVERVIEW
The course aims at providing basic and advanced knowledge of sail systems scantling (sail, mast and rigging as well as relevant equipment), including fluid structure interaction (FSI) hints, of sailing systems of yachts and large sail ships. Reference is made to applicable rules requirements and to widely applied design approaches.
Real test cases of each subject are analysed and each student is required to select his/her own yacht to be used in developing exercises.
AIMS AND CONTENT
LEARNING OUTCOMES
The course will provide basic knowledge about scantling criteria of sailing systems. Typical configurations are analyzed using applicable rules and by means of some advanced numerical methods. Some concepts of sail design, from a structural perspective, are presented along with a few hints about fluid structure interaction problems.
AIMS AND LEARNING OUTCOMES
The student will be able to design a sail system, properly selecting adequate scantling methods and approaches according to the system features and accounting for the yacht mission profile.
Advanced application of numerical methods for structural analysis, i.e. non linear finite element method as well as fluid-structure interaction techniques, will be also applied. Therefore, the student will understand fundamental theory of such approches, which is useful in many other problems in the field of naval architecture and marine engineering and beyond.
PREREQUISITES
Knowledge of fundamentals of all courses with particular reference to the following ones: Structural mechanics, Ship structures, Sailing Yacht Design
TEACHING METHODS
Theory lectures: about 32 hours
Computer class: about 28 hours practicing
In addition to theory lessons, this course includes also comprehensive practising based both on simple exercises and numerical applications with a FEM software.
SYLLABUS/CONTENT
Non linear finite element analysis including fluid structure interaction (FSI) phenomena with emphasis on sail systems behaviour are presented. Typical mast and rigging configurations are analyzed according to analytical methods proposed by applicable rules as well as using some advanced numerical methods (i.e. non linear FEM analysis). Concepts of sail design, from a structural perspective, are presented along with a few hints about fluid structure interaction problems.
Analytical and numerical applications on typical test cases are provided and developed during lectures for each topic of the course.
The following is the list of lecture topics:
- Introduction, mast design procedures
- Rig mechanics, loads, strength and limit states
- Simplified methods (Skene’s method and other traditional rules by class societies)
- Application of traditional rules and their limits
- FEM analysis (background, introduction to basic principles, stiffness matrix and elements formulations, linear models). Software example.
- Shrouds tension and mast compression
- Mast tuning: practical applications
- Linearized buckling of beams and shells: analytical vs. numerical
- Analytical vs. numerical buckling: practical applications (Euler beam in FEM)
- Introduction to non linear FEM analysis
- Non linear buckling and progressive collapse analysis (Euler beam models)
- Non linear analysis of structures, catenary curve and FEM simulations
- Numerical applications on non linear buckling (progressive collapse strategies)
- Mast design optimization and structural details (static strength, stress concentrations)
- Shrouds and stays models (catenaries and model improvement)
- Mast design optimization and structural details (local buckling)
- Mast panel design: “tube” models and structural details
- Practical applications on mast tube optimization
- Mast panel design: final recap on limit states and structural models
- Verification of the selected mast design (final exercise)
- Structural modeling of sails: numerical models
- Practical applications and software for sail design (membranes vs shells)
- Fluid structure interaction (FSI), 2D analysis and practical application of FSI (2D only)
- Final summary of course and review of practical applications. Questions and answers
RECOMMENDED READING/BIBLIOGRAPHY
- ADINA. Theory and modeling guide. ADINA R&D Inc., Watertown, Massachusset, USA
- Bathe KJ (1996). Finite element procedures. Prentice Hall, NJ, USA
- Larsson, L, Eliasson, RE (2013). Principles of Yacht Design. International Marine McGraw-Hill, Camden, Maine
- Applicable rules and guidelines of classification societies
- Scientific papers available in literature, and
- other documentation provided during lectures and made available through the course web site (www.aulaweb.unige.it)
TEACHERS AND EXAM BOARD
Ricevimento: In general on the scheduled lectures days in the place of the lecture (Genova or La Spezia), preferably arranging the meeting by e-mail in advance.
Exam Board
STEFANO GHELARDI (President)
CESARE MARIO RIZZO (President)
LESSONS
LESSONS START
Class schedule
EXAMS
EXAM DESCRIPTION
An oral exam will take place discussing exercises carried out during the course as well as basic principles and methods presented.
ASSESSMENT METHODS
Technical report of all exercises carried out should be presented at the exam (printed) and discussed
Exam schedule
Data | Ora | Luogo | Degree type | Note |
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20/01/2023 | 14:30 | LA SPEZIA | Orale | Students must send a report about the exercises developed during lessons 5 days before the exam date at stefano.ghelardi@edu.unige.it. Please title the email as: "Report Yacht Rigging Exam - Name Surname" |
17/02/2023 | 14:30 | LA SPEZIA | Orale | Students must send a report about the exercises developed during lessons 5 days before the exam date at stefano.ghelardi@edu.unige.it. Please title the email as: "Report Yacht Rigging Exam - Name Surname" |
23/06/2023 | 14:30 | LA SPEZIA | Orale | Students must send a report about the exercises developed during lessons 5 days before the exam date at stefano.ghelardi@edu.unige.it and cesare.rizzo@unige.it Please title the email as: "Report Yacht Rigging Exam - Name Surname" |
21/07/2023 | 14:30 | LA SPEZIA | Orale | Students must send a report about the exercises developed during lessons 5 days before the exam date at stefano.ghelardi@edu.unige.it and cesare.rizzo@unige.it Please title the email as: "Report Yacht Rigging Exam - Name Surname" |
15/09/2023 | 14:30 | LA SPEZIA | Orale | Students must send a report about the exercises developed during lessons 5 days before the exam date at stefano.ghelardi@edu.unige.it and cesare.rizzo@unige.it Please title the email as: "Report Yacht Rigging Exam - Name Surname" |
FURTHER INFORMATION
Further information about the course is given during lectures. Since limited bibliographic material is available, it is recommended to follow the lectures