Foundation Design of Offshore Wind Turbine Structures

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Design of Offshore Wind Turbine Training

About the Course

The costs of offshore wind are currently, significantly higher than onshore wind. A significant contributor to this higher cost is the cost of the foundations for the turbines. Hence a rational and optimized design of foundation for wind turbines is essential to reduce the overall cost.

This course gives a detailed knowledge about the design and analysis of mono pile, Suction piles, and jacket structure foundations. This course also includes the soil pile interaction and the dynamic responses.

The course will include both ultimate and fatigue limit state check for the design of these types of foundations. The uncertainties of various design variables will also be discussed in these lectures. Lastly a reliability based design of suction pile will be covered.

Who Should Attend

Engineers and researchers involved in the design of offshore wind farm foundation, Contracts engineers, Wind turbine Installation companies, Team leaders, Conversion Engineers, Project engineers and managers, offshore controls engineers, Safety inspectors will benefits from attending this course.

The course is innovative in both content & structure with a careful balance of theory & practice.

PROGRAMME

Day 1

09.00 – 10.30 Lecture 1: Overview of the whole Wind Turbine structure – Subhamoy Bhattacharya
10.30 – 11.00 Break
11.00 – 12.30 Lecture 2: Loads on the offshore wind turbine structure – Subhamoy Bhattacharya
12.30 -13.30 Lunch
13.30 – 15.00 Lecture 3: Consideration for foundation design and the calculations necessary – Domenico Lombardi
15.00 – 15.30 Break
15.30 – 17.00 Lecture 4: Geotechnical Site Investigation and Soil behaviour under cyclic loading – Domenico Lombardi

Day 2

09.00 – 10.30 Lecture 5: Soil Structure Interaction (Cyclic and dynamic)- Subhamoy Bhattacharya
10.30 – 11.00 Break
11.00 – 12.30 Lecture 6: Simplified hand calculation of case studies – Subhamoy Bhattacharya
12.30 – 13.30 Lunch
13.30 – 15.00 Lecture 7: Ultimate and Fatigue Strength of Monopiles – Purnendu Das
15.00 – 15.30 Break
15.30 – 17.00 Lecture 8: Reliability Based design of Suction Piles – Purnendu Das

Content of the lectures:

Lecture 1: Overview of the whole Wind Turbine structure General overview of the overall wind turbine structure/wind farm keeping in mind the concepts necessary for foundation design: [Wind Turbine  Structure – Dynamic sensitive nature, brief review of the turbine types, general considerations on the selection of site (wind speed, water depth, wave and current, ground type), cut-in and cut-out speed, natural frequency of wind turbine system]. Types of foundations either in use or proposed. Dynamics of these structures on different types of foundations.

Lecture 2: Loads on the offshore wind turbine structure This lecture will focus on the main loads on the structure from wind, wave, 1P and 3P with the aim to obtain the mudline bending moment for foundation design. Also this lecture will describe a simple frequency domain methodology to obtain the critical loads (overturning mudline moment, lateral and vertical loads) in the foundation due to the 4 types of loads. An EXCEL example will be taken to show the methodology.

Lecture 3: Consideration for foundation design and the calculations necessary The design consideration includes the following Limit States: ULS (Ultimate Limit State), SLS
(Serviceability Limit State) and FLS (Fatigue Limit State). Issues related to installation will also be discussed. This section will also discuss the calculations that needs to be carried out the designers:

(a) ultimate capacity of the foundation; (b) natural frequency of the whole system; (c) deflection and rotation of the foundation; (d) long term tilting of the
foundation and change in natural frequency.

Lecture 4: Geotechnical Site Investigation and Soil behaviour under cyclic loading This lecture will discuss the site investigation necessary and the soil testing required for obtaining the design parameters for carrying out the design. The lecture will also discuss the advanced soil testing apparatus that may be used to obtain the parameters.
Lecture 5: Soil Structure Interaction (Cyclic and dynamic) Explain the various Soil-Structure-Interaction and simplified methods that can be to carry out soilstructure
analysis will be described. The analysis are:

(a) Natural frequency of wind turbine structure considering the foundation flexibility based on a mathematical model; (b) Minimum requirement of foundation stiffness (Translational, Rotational and Cross-Coupling) from SLS; (c) Prediction of rotational and tilting of the wind turbine; (c) Long term rotation prediction.

Lecture 6: Simplified hand calculation of case studies This lecture will take an example of a wind turbine along with wind, wave and geotechnical data to carry out step by step calculations.

Lecture 7: Ultimate and Fatigue Strength of Monopiles Simple Analytical Model will be established to calculate the base bending moment and shear force to check the ultimate strength of the pile foundation due to the various combination of loadings ie wave load live load wind load and dead load etc. Simplified fatigue loading will be established to check the fatigue strength of the structure.

Lecture 8: Reliability Based design of Suction Piles The reliability analysis a suction anchor under following failure mode will be shown in the lecture

a) Vertical pullout due to the vertical load component at the pad eye b) Horizontal displacement due to the horizontal load component c) Additionally, failure due
to buckling of structure will also be included.
CV’S OF LECTURERS:

Subhamoy Bhattacharya:

Professor Subhamoy Bhattacharya currently holds the Chair in Geomechanics at the University of Surrey where he leads the Geomechanics Research Group. He is also the Programme Director for the MSc course in “Advanced Ground Engineering/Advanced Geotechnical Engineering” and the Director of Undergraduate Studies in Civil Engineering. Previously, he held the post of Senior Lecturer at the University of Bristol, Departmental Lecturer at the University of Oxford and Academic fellowship at Tokyo Institute of Technology as well as industrial positions with Fugro Limited (UK) and Consulting Engineering Services (India) Ltd – now Jacobs. He obtained his PhD from the University of Cambridge, investigating failure mechanisms of pilesupported structures in liquefiable soils. He proposed a new theory on pile failure which received the 2005 T.K.Hseih award for the best paper in civil engineering dynamics from the Institution of Civil Engineers. His further work on piles includes design principles for the foundation design of new generation Floating Production Storage and Offloading platforms, built from his experience designing piles for more conventional offshore structures. His work on p-y curves for clay appears in the latest API/ANSI/ISO code of practice. His current research interest are foundations for offshore wind turbines, seismic behaviour of piles.

Domenico Lombardi:

Domenico Lombardi is currently a lecturer in Geotechnical engineering at The University of Manchester. After graduating with a first class honours(with distinction) in Civil Engineering from the University of Sannio (Italy), Domenico moved to the University of Bristol to finish his postgraduate studies, first with an MSc in Offshore Engineering and then with a PhD in Earthquake Engineering. His doctoral studies focused on the effects of soil liquefaction on the dynamic behaviour of pile-supported structures. Before joining The University of Manchester, he was appointed as a Foreign Researcher in the Department of Civil and Environmental Engineering at Yamaguchi University (Japan), where he investigated the cyclic behaviour of soils and conducted a series of field surveys in the area hit by the 2011 Tōhoku earthquake and subsequent tsunami. Domenico is author of over 20 publications focusing on different civil engineering problems, including long-term performance of offshore wind turbines and design of structures in liquefiable soils. His main research interests are in geotechnics and structural dynamics, related to problems of offshore engineering and behaviour of structures under repetitive loading.

Purnendu Das

Purnendu Das BE, ME, PhD, C.Eng, C.MarEng, FRINA, FIStructE, FIMarEST has been the Director of ‘ASRANet Ltd’ (an ISO 9001-2008 certified company) since February 2006. He retired as Professor of Marine Structures in the Department of Naval Architecture & Marine Engineering at the University of Strathclyde, UK. Past EU projects were MARSTRUCT (a network of excellence on Marine Structure) and SHIPDISMANTL (a cost effective and environmentally friendly dismantling of ship structures). Past industrial projects included work from the UK Health and Safety Executive (HSE), MoD UK, Subsea-7 UK, Shell, Woodgroup and US Navies etc. He was the principal investigator of many EPSRC projects. Before joining the University of Glasgow in 1991 he worked with British Maritime Technology as Principal Structural Engineer (1984-91). He is the author of more than 250 publications, including contract reports and more than 60 journal papers and is a member of the editorial boards of the ‘Journal of Marine Structures’, ‘Journal of Ship & Offshore Structures’, ‘Journal of Engineering under Uncertainty: Hazards, Assessment and Mitigation’ and ‘Journal of Ocean and Climate System’ amongst others. His areas of research include limit state design and analysis & reliability analysis of ship & offshore structures. Purnendu Das has wide ranging industrial and academic contacts and has advised and supervised 20 PhD students, to his credit. Details of visits and collaborations include his various sabbatical study periods spent at University of California, Berkeley, USA (July – September 1996), at Lloyd’s Register of Shipping (August 1997), Kockums Ltd (July 1998) and spent some time at Instituto Superior Técnico (IST), Lisbon (July 2000). He has been running various successful CPD courses which are attracting many people from different industries. These courses are on ‘Fatigue & Fracture Analysis’, ‘Ships at Sea’, ‘Advanced Analysis and Design of Offshore Structures’, ‘Offshore Floating System Design’, ‘Structural Response under Fire and Blast Loading’ and ‘Design of Pipelines and Risers’ amongst others. He was a member of ISSC (International Ship and Offshore Structure Congress) for the periods of 1991-97 and 2003-2006. He was a member of the OMAE (Offshore Mechanics and Arctic Engineering) Organising Committee on ‘Safety and Reliability’. He has organised six ASRANet International Conferences in 2002 (Glasgow), 2004 (Barcelona), 2006 (Glasgow), 2008 (Athens), 2010 (Edinburgh) and 2012 (London) where a large number of participants from various countries attended. The theme of the conference is the integration of risk, advanced structural analysis and structural reliability analysis as applicable to various engineering structures. He is now the member of “Research committee” of the Institution of Structural Engineers (I.Struct.E) London.

Duration: 3 Days

Cost: £650 + VAT

 

Offshore Wind Turbine Training Aberdeen, Glasgow, Edinburgh, Inverness, Dunfermline and other sites throughout the UK including onsite closed company courses are available.

Offshore Wind Turbine Training Hamburg, Saudi Arabia, Bahrain, Kuwait, Qatar, Abu Dhabi, Dubai, India, Ghana and Nigeria is also available.

 

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