Single-Course Engelsk 5 ECTS

# Structural assessment of ships

## Overall Course Objectives

To enable the students to understand and to use modern rational methods within the strength of materials and reliability theory to design ships.

To enable students to do quality assurance of an engineering project.

See course description in Danish

Learning Objectives

• Comprehend the fundamentals of structural design and assessment of ships
• Comprehend the fundamentals of modeling of ocean waves
• Apply methods that account for the statistical nature of ocean waves
• Determine wave-induced loads on the ship in stochastic sea
• Determine extreme wave loads on the ship
• Determine the expected fatigue damage in the hull
• Determine hull girder stresses due to static and dynamic loads
• Assess the safety against the failure of the hull girder under specified loading
• Understand loads due to hull girder vibrations
• Understand safety factors for rule development
• Assess the safety of a vessel after collision or grounding
• Write a technical report for a specific ship dealing with bullets mentioned above

Course Content

The main emphasis is on the determination of the global response of a given ship sailing in waves. Safety against global failure of the hull girder should be evaluated under normal operation conditions. Accidental loads (collision and grounding) will also be covered as well as rational rule development.

Bending moment, sagging, hogging.
Ocean waves: linear and non-linear wave elevation, regular and irregular waves, excitation wave spectrum, stationary process, wave scatter diagram.
Stresses in the hull girder: midship section, effective thickness, section modulus, maximum normal stress, yield stress. Statistical short-term and long-term analyses, extreme values, expected fatigue damage.
Hull vibrations: hull flexibility, the natural frequency of the hull, springing, whipping.
Reliability analysis of the hull girder: Hasofer-Lind safety index, probability of failure, limit state function.

Recommended prerequisites

41501/41502/41312/41202/41201/41271, Mathematics including linear algebra, calculus and differential equations; Statistics and probability theory; Statics, mechanical vibrations, and strength of materials; Fluid mechanics; Programming using e.g. MATLAB; Fundamental knowledge of maritime structures.

Teaching Method

Lecture modules and project work.

Faculty

Remarks

The students have the possibility to continue working on a ship project initiated in the course 41271 Ship Design.

See course in the course database.

## Registration

Language Engelsk 13 weeks DTU Lyngby Campus 41216 Candidate Week 36 Week 49 Tues 8-12
Price 9.250,00 DKK