Module overview
This module extends the fundamentals associated with the structural design of floating maritime vessels to account for the complexity of fluid-structure interactions on ship life and operation. Students will assess the impact of fluid-structure interactions by predicting the structural integrity through life of floating maritime vessels in a seaway.
There are two assignments which integrate the fluid loading and structural response through applications to real floating vessels.
Linked modules
Pre-requisites: FEEG2005 and SESS2015
Aims and Objectives
Learning Outcomes
Full CEng Programme Level Learning Outcomes
Having successfully completed this module you will be able to:
- In determining the impact of engineering decisions on floating vessel performance in waves and subsequent load effects in Part A and B assignments, students will demonstrate a systems-based engineering approach.
- In the fatigue life assessment (Part B) students need to demonstrate their understanding of issues related to through life sustainability (socio-economic environmental) and the impact of engineering decisions on the longer term consequences of vessel design and operation.
- In both assignments, students will select and critically evaluate technical literature to underpin their arguments.
- In the fatigue life assessment (Part B) students are expected to understand the link between stakeholders in vessel design through operation to end of life. They are expected to understand socio-economic and environmental sustainability, the impact of human decisions and actions in design and operation and the role of regulation and classification.
- In both assignments, students are expected to select and apply appropriate computation and analytical techniques, including FEA and coding to model wave induced load effects and make fatigue life predictions of floating vessels.
- In both assignments, students are asked to demonstrate their understanding of risk: in the wave induced loads assignment (Part A) by comparing floating vessel forms for slamming and deck wetness and the effect of structural design on hydrodynamic performance, and in the fatigue life assessment (Part B) through the discussion of structural design methods and goal-based analyses.
- The wave induced loads (Part A) assignment has both group and individual elements, whilst the fatigue life assessment (Part B) is an individual contribution. Students will have feedback on Part A to evaluate their individual and team performance before continuing onto Part B.
- In both assignments, students will be expected to formulate and analyse the complex problems of floating vessel operation in waves, structural response and fatigue life determination, using statistical methods to underpin engineering judgement.
- In the fatigue life assessment (Part B) students need to demonstrate their understanding of issues related to through life sustainability (socio-economic environmental) and the impact of engineering decisions on the longer term consequences of vessel design and operation.
- In both Part A (wave induced loads) and Part B (fatigue life assessment) assignments, students will be expected to apply a comprehensive knowledge of mathematics, statistics, natural science and engineering principles to the solution of the complex problems of floating vessel operation in waves, structural response and fatigue life determination.
Knowledge and Understanding
Having successfully completed this module, you will be able to demonstrate knowledge and understanding of:
- Through analysis and critical assessment, understand the nuances of dynamics in relation to floating vessel design and operation.
- Critique fatigue and fracture assessment approaches for floating vessels and formulate a spectral fatigue assessment for the long-term structural performance.
- Assess the importance of safety and sustainability in structural design
- Critique concepts of rational structural design procedures
- Quantify the structural effect on floating vessels of fluid-structure interactions through the synthesis of seakeeping and hydroelasticity methods
- Apply deterministic and statistical measures to assess wave loading and floating vessel behaviour in different sea states
- Qualify the dynamic behaviour of differing floating vessel types through synthesis of concepts into engineering application and design.
- Argue how fatigue, fracture, and fluid structure interactions impact the structural design of floating vessels.
Syllabus
Part A; lectures on:
Fluid-Structure Interactions
- Introduction to hydroelasticity theory.
- Dynamics of flexible beamlike structure in vacuo.
- Principal modes and natural frequencies.
- Hydroelastic approach to still water problem.
- Hydrodynamics of regular waves
- Strip theory, boundary value problems.
- Fluid actions in equilibrium axes.
- Hydrodynamic coefficients
- Generalized equation of motion in seaway.
- Responses (bodily motions -seakeeping, distortions, bending moments, stresses) in waves.
- Random seas and responses in random seas.
- Criteria for comparing floating vessel forms - slamming, deck wetness, etc..
Part B; lectures on:
Structural Integrity
- The rational structural design of floating vessels:
- Levels of structural design processes
- Limit state design including ultimate and fatigue limits and load effects
- Fatigue of floating vessel structures:
- Basic concepts of fatigue, fatigue damage mechanisms, S-N methodology, local strain methodology
- Life time load determination, wave induced loads, stochastic combination of loads
- Load effect determination, FEA approaches and choices of elements, meshing, structural details
- Fatigue assessments, voyage simulation behaviour, long term fatigue damage
- Fracture modelling in ship and offshore structures:
- Fundamental concepts - energy-based and stress intensity based approaches
- LEFM, modes of crack extension, useful K solutions, fracture testing, life modelling
The integrations of Parts A (worth 65%) and B (worth 35%) will take place through two group assignments.
Wave-induced Loads Assignment (65%);
where the students perform predict wave-induced loads on a real floating vessel using quasi-static and coupled hydroelastic analyses and understand how flexible models can be used for experimentatal validation.
Ship Fatigue Life Assignment (35%);
where the students analyse stress records (measured or predicted) of a real floating vessel in order to predict the fatigue life of a structural detail.
Learning and Teaching
Teaching and learning methods
Teaching methods include
- lectures on hydroelasticity and fluid structure interactions
- lectures on fatigue and fracture related to ship structures
- lectures on design methods
- supervised design office sessions focused on the two assignments
Learning activities include
- Directed reading/independent learning
- Example sheets for problem solving exercises
- Report-writing for the 2 group assignments
- Application of structures and fluid-structure interactions related knowledge to real floating vessels through the two assignments
- Use of commercial and academic software to perform the two assignments
Type | Hours |
---|---|
Follow-up work | 30 |
Practical classes and workshops | 14 |
Wider reading or practice | 16 |
Preparation for scheduled sessions | 14 |
Completion of assessment task | 54 |
Lecture | 22 |
Total study time | 150 |
Resources & Reading list
General Resources
Blackboard. Resources and reading list: Available on blackboard
Assessment
Assessment strategy
Referral Method: There are two assignments in this module. If the mark achieved for the module is less than the module pass mark then a referral will be required in one or both assignments:
If the marks for both assignments are less than the module pass mark then both assignments must be referred. Otherwise the assignment scoring less than the module pass mark should be referred and the passed assignment marks will be carried forward.
Summative
This is how we’ll formally assess what you have learned in this module.
Method | Percentage contribution |
---|---|
Final Assessment | 65% |
Continuous Assessment | 35% |
Referral
This is how we’ll assess you if you don’t meet the criteria to pass this module.
Method | Percentage contribution |
---|---|
Set Task | 100% |
Repeat Information
Repeat type: Internal & External