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Styrkeberegning af skibe (Structural Assessment of Ships )

Language

English

Course format On-site
Date 2020-08-31 - 2020-12-14

General course objectives

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

To enable to student to do a quality assurance of an engineering project.

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 shortterm and long term analyses, extreme values, expected fatigue damage.
• Hull vibrations: hull flexibility, natural frequency of the hull, springing, whipping.
• Reliability analysis of the hull girder: Hasofer-Lind safety index, probability of failure, limit state function.

Prerequisites

Recommended prerequisites 41501 Strength of materials 1. 41502 Strength of materials 2. 41312 Basic fluid mechanics. 41201 Fundamentals of ships and other floating structures. 41271 Ship design. , 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.

Learning outcomes

A student who has met the objectives of the course will be able to:

• 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

ISCED Categories

Physical and chemical oceanography
Scientific modelling
Naval engineering