Progress in Offshore Research at TUD
Omschrijving
Progress in Offshore Research at Delft University of Technology (TU Delft).
This evening KIVI NIRIA will offer the floor to two PhD students to present their work, which is to lead to a PhD thesis.
*Underwater noise from offshore pile driving by Apostolos Tsouvalas
The generated levels of underwater noise from pile driving during the construction of large offshore wind farms are unacceptably high according to upcoming regulations. This results in serious delays and increased costs for the offshore wind industry since the pile driving activities have to be conducted at specific times during the year.
During offshore pile driving, a hydraulic hammer hits the top of the pile and a stress wave is generated which propagates downwards. Part of the energy introduced into the system is spent on the pile progression into the soil whereas another part is irradiated into the water in the form of pressures waves from the vibrating surface of the shell. A third part of the energy enters the soil and generates elastic waves which propagate through the soil medium.
The primary goal of this project is to understand and analyze the main sources of underwater noise generated from offshore pile driving and to test the available mitigation measures used in practice. For this reason, a new model will be developed which will include the hydraulic hammer, the monopile, the compressible viscous water and the water-saturated seabed. By doing this, we aim at providing the offshore wind industry with the necessary tools in order to predict and eventually reduce the underwater noise for a wide range of system parameters.
* Ice Induces Vibrations of Offshore Structures by Hayo Hendrikse
Occasionally bottom founded offshore structures experience sustained vibration due to drifting ice sheets crushing against them. These vibrations, known as Ice Induced Vibrations (IIV), may lead to fatigue problems, safety issues and uncomfortable working conditions. Two following mechanisms are believed to lead to IIV:
• The synchronisation of the frequency of the ice failure and that of the structure;
• Amplification due to a descending dependence of the compressive ice strength on the loading rate.
To date only phenomenological models exist for the prediction of ice- and structural behaviour in these situations which are not up to the standards set by the industry.
Goal: To develop a hybrid multi-scale model of a moving ice sheet dynamically interacting with a bottom founded structure.
Na de pauze vindt de uitreiking plaats van de Prijs voor het Beste Afstudeerwerk Offshore en Bagger Techniek 2012.
Met ingang van 2012 heeft de Afdeling voor Offshore Techniek van het Koninklijk Instituut Van Ingenieurs KIVI NIRIA een jaarlijkse prijs ingesteld voor het beste afstudeerwerk in de Offshore en Bagger Techniek. Met de afstudeerprijs is € 2.000 gemoeid.
Er zijn zeven kandidaten genomineerd:
- Jeroen Brugman (Buoyancy tank connection study for the Heerema Hybrid Exchangable)
- Thijs den Hamer (Optimizing for Design and Operation - Application of a Configuration Optimization Routine to the Design and Operation of an Offshore Wind Turbine Installation Jack-Up)
- Reza Karimi (Investigation of Hydrostructural Interactions based on the results of the SLOSHEL project)
- Jan Maris (Examination of Non-Stationary records of Nonlinear Waves using Signal Processing Methods)
- Alexander van Nauta Lemke (The Bypass Dome - A New Solution for Offshore Hydrocarbon Containment)
- Richard van Rijs (Bulldozer effect in front of a draghead)
- Arnaud Verschelde (Erosion behaviour of a draghead)
Op 24 mei a.s. zal Wim Jolles namens de jury (die naast hemzelf bestaat uit: Jo Pinkster, Peter Tan, Jan Vugts en Wim Vlasblom) bekend maken aan wie van bovenstaande kandidaten de Prijs voor het Beste Afstudeerwerk Offshore en Bagger Techniek 2012 is toegekend. Na de uitreiking zal de winnaar een toelichting op zijn afstudeerverslag geven.
Spreker(s)
- Apostolos Tsouvalas & Hayo Hendrikse, PhD Candidates Section Structural Mechanics (Promotor: Prof.dr. A.V. Metrikine)
- winnaar Prijs voor het Beste Afstudeerwerk Offshore en Bagger Techniek 2012
BIJZONDERHEDEN
* Er is om 18.00 uur gelegenheid tot deelname aan de gesponsorde broodmaaltijd.
* De broodmaaltijd vooraf en de borrel na afloop worden aangeboden door TU Delft.
* De borrel na afloop wordt gehouden in café "de Posthoorn" op het Lange Voorhout.
* Tot uiterlijk 22 mei kunt u aangeven of u aan de broodmaaltijd wilt deelnemen.
* Na 22 mei kunt u zich -zolang het maximum aantal deelnemers nog niet bereikt is - nog wel aanmelden, maar is er voor u geen broodmaaltijd gereserveerd. U wordt dan om 19.00 uur verwacht.
Locatie
KIVI NIRIA Gebouw, Prinsessegracht 23
2514 AP Den Haag
Organisator
Offshore Techniek
Naam en contactgegevens voor informatie
Nadere informatie bij onderstaand e-mailadres.