Ship Design for open and ice-covered waters

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Ship Design Training Course

This course will deal with the first principle design of ship structures. Advanced analysis procedures
for the design of beams and plates (80% of ship structures are made up of plates) will be dealt with. The ultimate strength of hull girders will be given based on progressive collapse analysis and also a
simplified procedure. Finally, the common structural rules for the design of the hull girders will also be given.
Ship structural design for arctic conditions is primarily based on experience of small transversally
stiffened ships operating in first year ice in the Baltic Sea. Thus, the question arises if this experience
and the resulting regulations are applicable to other areas with seasonal or year-round ice coverage. The shortcoming of the current rules and regulations will be presented together with first-principle methods for a mission-based assessment of the ice loading and structural design.

Engineers and scientists involved in the design of ships and ship systems. Personnel from ship
management companies, oil companies, classification societies and ship builders will benefit from
attending this course. The course is innovative in both content & structure with a careful balance of
theory & practice. Design, assessment and management of a wide range of engineering structures will also benefit from this course.

Day 1

09.00 – 10.30 Lecture 1: Overview of Ship Structure Design.
Prof Purnendu Das

10.30 – 10.45 Break

10.45 – 12.15 Lecture 2: Analysis and Design of Unstiffened and Stiffened Steel Plates, Design
Codes – I.
Prof Purnendu Das

12.15 -13.30 Lunch

13.30 – 15.00 Lecture 3: Analysis and Design of Unstiffened and Stiffened Steel Plates, Design
Codes – II.
Prof Purnendu Das

15.00 – 15.30 Break

15.30 – 17.00 Lecture 4: Ultimate Strength of Hull Girder
Prof Purnendu Das

Day 2

09.00 – 10.30 Lecture 5: Introduction to Arctic challenges
Prof Sören Ehlers

10.30 – 10.45 Break

10.45 – 12.15 Lecture 6: Mission-based ice-conditions and performance in ice
Prof Sören Ehlers

12.15 -13.30 Lunch

13.30 – 15.00 Lecture 7: Current design ice load calculations
Prof Sören Ehlers

15.00 – 15.30 Break

15.30 – 17.00 Lecture 8: Mission-based ice load assessment
Prof Sören Ehlers


Lecture 1: Deterministic and Probabilistic Design; Working Stress Design (WSD) and Load
Resistance Factor Design (LRFD); Load Combination; Safety Check

Lecture 2: Plate buckling under different loadings, Ultimate strength of unstiffened plate,
Examples problems, DNV and API Codes.

Lecture 3: Stiffened plates, Inter-frame collapse, example problems, DNV & API Codes.

Lecture 4: Load shortening curves, progressive collapse analysis. Simplified hull girder

Lecture 5: The challenges when operating in Arctic waters will be presented.

Lecture 6: Availability of ice conditions for remote areas, uncertainties and direct
calculations for ice thickness.

Lecture 7: Rules based ice load calculations and lack of transparency of the design point will
be presented.

Lecture 8: A first principle-based procedure will be presented to obtain ice loads based on
the specific mission of the ship in ice. The results will be compared to the current rule-based


Professor Purnendu Das
Director at ASRANet
Professor Purnendu Das. BE, ME, PhD, C.Eng, C.MarEng, FRINA, FIStructE, FIMarEST has been
the Director of ‘ASRANet Ltd’ since February 2006. He retired as a Professor of Marine Structures in
the Department of Naval Architecture & Marine Engineering at the University of Strathclyde, UK in
September 2011. 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 Ocean and Ship Technology’ and ‘Journal of Ocean and Climate System’ and the Journal of Ship Mechanics 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 is running about 20 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 is running about 15 bi-annual international conferences on various themes like Risk, Reliability, Advanced Analysis & Design of Engineering Structures, including marine structures. He was a member of the “Research Committee” of Structural Engineers (IStructE) during 2012-2015. He was a visiting Professor at IST Surabaya, Indonesia from July 2015 for one year. He was a visiting professor at the Wuhan University of Technology, China from July 2016-July 2019. He is a visiting professor now at the University of Montenegro, Montenegro.

Professor Sören Ehlers
University of Hamburg
Sören Ehlers, D.Sc., is a professor for design and analysis of ships and offshore structures and the head of the institute for ship structural design and analysis at the Hamburg University of Technology
(TUHH). Prior to his position at TUHH, he held a full professorship at NTNU in the field of sustainable
Arctic Sea transportation. He is an expert in consequences assessment for accidental events and further in the field of material modelling for non-linear finite element simulations. Furthermore, he is
developing new ice material models to assess the ice-structure interaction and design methods for ice going vessels using small and large-scale experimental research. He is concerned with the overall structural response and strength of ships subjected to extreme conditions. Additionally, he combines optimisation techniques with extensive assessment procedures to obtain new concepts. He has more than 210 publications in the corresponding fields. He is the chairman of the international ship structures committee (ISSC) V.2 on Experimental Methods, a symposium co-coordinator for the Arctic Technology Symposium at OMAE, a member of the OOAE Executive Committee, a member of the board of the German Association for Marine Technology (GMT), the conference co-chair ICSOS as well as a member and board member of the German society of Naval Architects (STG) besides being the editor for the Ship Technology Research Journal, an associate editor for Marine Structures and JOMAE, an editorial board member for Ships and Offshore Structures and a reviewer for several international journals.

Duration: 2 Days

Cost: £850 + Vat

Ship Design Training London, Scotland, Glasgow, Edinburgh, Inverness, Aberdeen and onsite course available throughout the UK.

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