Course code: mt835

Course name: Hydro Structural Subjects

This concerns a Course

ECTS credit points: 3

Faculty of Mechanical Engineering and Marine Technology

Section of  Ship Structures

Lecturer(s): Vink, ir. J.H.,

Tel.:  015 - 27 85923

Catalog data:

Superposition of global and local responses,

Internal tank pressures, External pressures, Splash zone, Intermitted wetting,

Long term distribution of stresses, Fatigue damage,

Hydroelasticity

Course year:

MSc 1^st year

Semester:

2A

Hours per week:

4

Other hours:

Assessment:

Written report

Assessment period:

2A

(see academic calendar)

Prerequisites (course codes):

mt521: Ship Motions and Manoeuvring 2, mt832: Structural Design and Strength 3, mtp304: Project Structural Design and Strength 4

Follow up (course codes):

Detailed description of topics:

Contents planned for the course of 2002-2003

o          Response superposition in view of hull girder bending stresses in regular waves.

o          Local response due to outside pressures at the shell, intermitted wetting.

o          Stress responses due to regional structural response.

o          Combining local response and global hull responses.

o          Long term distribution of stresses in view of fatigue damage of structural components.

o          Integral structural finite element model of ship to determine stress response functions.

o          Hydroelasticity: Working definition. Springing

o          Hydrodynamic interaction between floating structures and mechanical coupling: MOB’s.

o          Vortex induced vibrations, VIV.

Course material:

References from literature:

• Ship Hydromechanics, part I, Journee, Pinkster
• Ship Hydromechanics, part II,
• Offshore Hydromechanics, Journee, Massie, DUT
• Structural design and Strength 2, Boon, Vink
• Structural Design and Strength 3, Boon, Vink
• Hydroelasticity in Marine Technology, Proceedings of conference 1994, Trondheim

Remarks assessment, entry requirements, etc.:

Mark will be based upon results of weekly  exercices.

Learning goals:

The student must be able to:

1. apply response superposition in view of hull girder bending stresses in regular waves

2. calculate local response due to outside pressures at the shell, and assess pressures in the splash zone, using output of a Diffraction calculation for a ship hull in regular waves

3. derive a mathematical model to assess variations of internal pressures on tank walls due to ship motions for tanks which are 100% filled with liquid

4. identify the problems in combining global hull response with response from local in- and external pressures

5. illustrate the principles of a two-step stress response analysis with a FEM-model for rigid ship hulls, based upon ship motions and external hull pressures as calculated with 3D-diffraction methods

6. explain the phenomenon of hydrodynamic coupling/interference between floating rigid bodies, to formulate the relevant matrix equation, to apply it for simple cases, make a simulation of the resulting motions in regular waves and evaluate the results

7. formulate the additional transformations in the matrix equation for hinge linked rigid bodies including hydrodynamic coupling (MOB), to apply it for simple cases, make a simulation of the resulting motions in regular waves and evaluate the results

8. describe the phenomenon of Hydro-elastic response of relatively elastic floating structures, e.g. VLFS’s, to explain the differential equation for e.g. a flexible thin plate in regular waves, to apply it for a flexible barge composed of 12 segments and evaluate the results

9. explain the phenomenon of springing of ships in regular waves

10. explain the differential equations for the transient response of a flexible beam (hull girder) due to impact, e.g. slamming, whipping etc

11. describe the phenomenon of Vortex Induced Vibrations (VIV) and apply engineering solution methods to simple cases

Computer use:

as necessary

Laboratory project(s):

Design content:

Advanced topics for response evaluation and structural design to judge viability of unconventional concepts og floating structures

Percentage of design:  50%