Et profilbilde

Professor emeritus
Ivar Langen { "honorific-suffix": "Professor emeritus", "fn": "Ivar Langen", "tel": "Telefon: 51832143", "email": "ivar.langen@uis.no" }

Avdeling/enhet Det teknisk- naturvitenskapelige fakultet
Institutt/senter Institutt for maskin, bygg og materialteknologi
Rom KE E-235
Tlf priv/mob +4795916370

Biography Ivar Langen

Born 21 Dec. 1942, Folldal, Norway

Married to Solveig Langen, 4 children

Dr. Langen obtained his M.Sc. in Structural Engineering from The Norwegian Institute of Technology (NTH), Trondheim, Norway 1968 and the dr. ing. degree from the same institution in 1981. From 1968 to 1984 he worked alternating at NTH and the research foundation SINTEF with teaching and research and development within finite element methods and programs, structural dynamics and offshore structures.

In 1984 he joined Statoil in Stavanger as lead engineer and later research manager and department manager working with reliability of offshore structures, structural integrity monitoring and analysis of full scale measurements of platform behaviour. Besides his Statoil duties he was adjunct professor of Engineering Mechanics at Rogaland University Centre (later Stavanger University College) from 1986 -1994. The academic year 1991 -1992 he was Visiting Research Engineer and Consulting Professor, Reliability of Marine Structures Program, Department of Civil Engineering, Stanford University, California, USA.

In 1994 he was appointed Professor of Mechanical Engineering (Applied Mechanics) at Stavanger University College, (later University of Stavanger), Stavanger, Norway with research activities in reliability based design, inspection and maintenance planning, dynamics of offshore structures and mechanical systems and simulation of coiled tubing fatigue. From 2000 he was vice dean, School of Science and Technology, Stavanger University College and chairman of the Doctoral Programme Committee. He was the founder and director of Centre for Maintenance and Asset Management at Stavanger University College from 1997-2003.

In 2003 he was elected Rector (president) of University of Stavanger for the term 2003 ?2007. He was member of the Research Committee , The Norwegian  Association of Higher Education Institution  (UHR) 2003-2005 and  elected member of the Board of The Norwegian  Association of Higher Education Institution  (UHR) 2005-2007

From 2009 - 2013 he was associated with NORCOWE ?Norwegian Centre for Offshore Wind Energy as Work package manager for Offshore Deployment and Operations

In 2010 he retired from his professor chair and is now professor emeritus.

Forskningsområder

Utvalgte publikasjoner

SELECTED PUBLICATIONS:

Books:

 1    Langen, I. og Sigbjörnsson, R.: "Dynamisk analyse av konstruksjoner" (Dynamic Analysis of Structures), Tapir Publishers, Trondheim, 1979.

2     Holand, I. and Langen, I.: "Dynamic Analysis of Floating Bridges" in Norwegian Bridge Building, Edited by P. Aune and I. Holand, Tapir Publishers, Trondheim, 1981.

 

 Peer reviewed Journal papers:

1.        Holand, I., Langen, I. and Sigbõrrnsson, R.:"Dynamic Analysis of a Curved Floating Bridge", IABSE Proceedings, P-5/77, 1977.

2.        Langen, I. and Sigbjörnsson, R.: "On Stochastic Dynamics of Floating Bridges. Engineering Structures, Vol. 2, No. 4, 1980, pp. 209-216.

3.        Langen, I.: "Probabilistic Methods for Dynamic Analysis of Floating Bridges", Norwegian Maritime Research, Vol. 11, No. 1, 1983.

4.        Leira, B.J. and Langen, I.:"On Probabilistic Design of a Concrete Floating Bridge", Nordic Concrete Research 84, Oslo, 1984.

5.        Langen, I., Skjåstad, O. and Haver,S.: "Measured and Predicted Dynamic Behaviour of and Offshore Gravity Platform", Applied Ocean Research, Vol 20 Nos. 1-2, 1998, pp 15 ? 26

 6    Hellevik, S.G., Langen, I. and Sørensen, J.D.: ?Cost Optimal Reliability Based Inspection and Replacement Planning of Piping subjected to CO2 Corrosion?,  Int. Journal of Pressure Vessels and Piping, Vol 76, No 8, 1999, pp 527 ?538

7          Hellevik, S.G. and Langen, I.:?Optimal Design-Phase Inspection and Replacement Planning of Pipelines Subjected to CO2 Corrosion?, Int. J. Offshore and Polar Engineering, Vol 10. No. 2, June 2000

 

Conference papers with peer review:

1          Langen, I., Spidsøe, N., Bruce, R.L. and Heavner, J.W.: "Measured Dynamic Behaviour of North Sea Jacket Platforms", Offshore Technology Conference, Paper 4655, Houston, 1984.

2          Heavner, J.W., Thuestad, T., Langen, I. and Syvertsen, K.: "Measured Fatigue Stress Response of North Sea Jacket Platforms", Proc. ICOSSAR'85, 4th International Conference on Structural Safety and Reliability, Kobe, Japan, May 27-29, 1985.

3          Leira, B.J. and Langen, I.: "Probabilistic Aspects of the Design of Floating Bridges", Proc. ICOSSAR'85, 4th International Conference on Structural Safety and Reliability, Kobe, Japan, May 27-29, 1985.

4          Thebault, J., Robberstad, L., Langen, I., Agnello, G., Doucet, Y. and Nerzic, R.:"In - Service Response Analysis of Two Fixed Offshore Platforms", BOSS'85, 4th International Conference on Behaviour of Offshore Structures, Delft, The Netherlands, 1-5 July, 1985.

5          Spidsøe, N. and Langen, I.:  "Non-linear Damping of Fixed Offshore Platforms", BOSS'85, 4th International Conference on Behaviour of Offshore Structures, Delft, The Netherlands, 1-5 July, 1985.

6          Langen, I. and Sigbjörnsson, R.: "Evaluation of Floating Bridge Behaviour", Proc. Conference on Directional Wave Spectra Applications, Berkeley California, 14-16 September 1981. Edited by R. Wiegel, ASCE, New York, 1982.

7          Langen, I., Sandsmark, N., Reiersen, J.A. and Salthaug, I: . "A Generalized Beam Element for Dynamic Analysis of Space Frame Structures", Proc. International Conference on Finite Element Methods, Shanghai, China, 2-6 August 1982, Second Volume pp. 131-135.

8          Dalane, J.I., Bjerager, P., Karamchandani, A. and Langen, I.: "Updating in Structural System Reliability; An Application to Offshore Structures under Fatigue Loads", ICASP6 - Sixth Int. Conf. on application of Statistics and Reliability in Civil Engineering, Mexico City, June 1991.

9          Bjerager, P., Langen, I., Winterstein, S., Martinsen, T. and Karunakaran, D.:"Application of Nonlinear Stochastic Mechanics in Offshore Engineering", IUTAM Symposium on Nonlinear Stochastic Mechanics, Torino, Italy, July 1991.

10      Dalane, J.I., Langen,I. and Bjerager, P.: "Probabilistic Robustness and Importance Measures for Structural Systems", Statoil Report IGT-KOB 91014, Stavanger 1991

11      Dalane, J.I., Haver, S. and Langen I.: "Variability in Load and Strength for a Jack-up Structure", Proceedings ISOPE 93 The Third International Offshore and Polar Engineering Conference, Singapore, 6-11 June, 1993.

12      Dalane, J.I. and Langen, I.: "Probabilistic Inspection Planning for Offshore Structures Using on Inspection Importance Measure", ICOSSAR - 6th International Conf. on Structural Safety and Reliability, Innsbruck, 9-13 August 1993.

13      Ahilan, R.V, Munthe Kaas,O. and Langen, I.: "Analysis of  Dynamic Transient Response (Ringing) in a Gravity Base Structure", Offshore Technology Conference, Houston May 1994, Paper No. 007464

14      Hellevik, S.G., Langen, I. and Sørensen, J.D.: "Cost  Optimal Reliability Based Inspection and Replacement Planning of Piping", Proceedings of the 1997 ASME Pressure Vessel and Piping Conference, PVP-Vol. 349 Plant Systems/Components Aging Management, edited by I.T. Kisisel, ASME New York, 1997

15      Langen, I., Skjåstad, O. and Haver,S.: "Measured and Predicted Dynamic Behaviour of and Offshore Gravity Platform", Proceedings BOSS'97 Eight International Conference on the Behaviour of Offshore Structures,  Delft, The Netherlands, Vol 3 Structures, edited by J.H.Vugts, Pergamon,1997

22    Hellevik; S.G. and Langen, I.: ?Optimal Design-Phase Inspection and Replacement Planning of Pipelines Subjected to CO2 Corrosion?, Proceedings of The 9th International Offshore and Polar Engineering Conference, Brest, 30 May ? 4 June, 1999

16      Hellevik, S.G. and Langen, I.: ?In-Service Inspection Planning of Flowlines Subjected to CO2 Corrosion?, Proceedings of The 10th International Offshore and Polar Engineering Conference, Seattle, 28 May ? 2 June, 2000

17      Langen, I., Than, T.K., Birkeland, O. and Rølvåg, T.: ?Simulation of Dynamic Behaviour of an Offshore Crane on a Floating Production Vessel? Proceedings of NAFEMS World Congress 2001 on The Evolution of Product Simulation, Lake Como, Italy April 2001, Volume 1, NAFEMS, Glasgow, UK

18      Aleksandersen, J., Langen, I., Meling, M. and Lien, A.: ?Autonomous Subsea Tie In System (AUSTIN) for  Large Diameter Pipelines in Deep Waters?, Proceedings of The 11th International Offshore and Polar Engineering Conference, Stavanger, 17  ? 22 June, 2001

19      Ersdal, G and Langen, I: ?On Assessment of Existing Offshore Structures?; Proceedings of 12th International Offshore and Polar Engineering Conference, Kitakyushu, Japan 26 ? 31 May 2002, Vol 4, pp 426 -433

20      Than, T.K., Langen, I. and Birkeland, O.:? Modelling and Simulation of Offshore Crane Operations on a Floating Production Vessel?, Proceedings of The 12th International Offshore and Polar Engineering Conference, Kitakyushu, Japan 26 ? 31 May 2002, Vol 1, pp 209 - 216

21      Ersdal, G, Sørensen, J. D. and Langen,I: ?Updating of Structural Failure Probability based on Experienced Wave Loading?, Proceedings of  13th  International Offshore and Polar Engineering Conference, Honolulu, USA, 25.-30 May 2003, Vol 4, pp 461 -468

22      Ersdal, G., Kübler, O., Faber.M.H., Sørensen,J:D. and Langen,I. ?Economic optimal reserve strength for jacket structures, ASTRANET conference 2004, Barcelona, Spain, ASTRANET

23      Marchenko,A., Langen,I. and Shestov,A.:?Hydrological Characteristics of the Strait Separating Braganzavågen from Sveabukta in Van Mijen Fjord? Coastal Technology ? COAST 2008, NTNU, Trondheim 29-30 May 2008

24      Marchenko,A., Langen,I. and Shestov,A.:?Hydrological Characteristics of a Narrow and Shallow Part of Van Mijen Fjord on Spitsbergen? Proceedings of 19th International Offshore and Polar Engineering Conference, Osaka, Japan, June 21-26, 2009, Vol 1 pp 649 - 657 

 

 

Pågående forskning

Arbeidserfaring

Vitenskapelige publikasjoner (fra CRISTin)

  • Chung, Jim S.; Langen, Ivar; Kokkinis, Ted; Wang, Alan M. (2013). Proceedings of The 23rd International Ocean and Polar Engineering Conference (ISOPE 2013). International Society of Offshore & Polar Engineers. ISBN 978-1-880653-99-9. 4000 s.
  • Chung, Jin S.; Langen, Ivar; Hong, Sa Young; Prinsenberg, Simon J. (2012). Proceedings of the Twenty-second (2012) International Offshore and Polar Engineering Conference. International Society of Offshore & Polar Engineers. ISBN 978-1-880653-94-4. 4200 s.
  • Hygen, Gunn Kari K.; Langen, Ivar; Schjølberg, Per; Mathisen, Håkon s.; Hansen, Ernst W.M. (1999). Fokus på produksjon, drift og vedlikehold offshore. Teknologiske utfordringer: ståsted og styrkeområder. CORD, SINTEF Energiforskning. 24 s.
  • Marchenko, Aleksey; Langen, Ivar; Shestov, Aleksey (2009). Hydrological Characteristics of a Narrow and Shallow Part of Van Mijen Fjord on Spitsbergen. 2009-06-21 - 2009-06-26.
  • Marchenko, Aleksey; Langen, Ivar; Shestov, Aleksey (2008). Hydrological Characteristics of the Strait Separating Braganzavågen from Sveabukta in Van Mijen Fjord. 2008-05-29 - 2008-05-30.
  • Ersdal, Gerhard; Kübler, Oliver; Faber, Michael H; Sørensen, John Dalsgaard; Haver, Sverre; Langen, Ivar (2004). Economic Optimal Reserve Strength for a Jacket Structure. 2004-07-05 - 2004-07-07.
  • Ersdal, Gerhard; Sørensen, John Dalsgaard; Langen, Ivar (2003). Updating of structural failure probability based on experienced wave loading. 2003-05-25 - 2003-05-30.
  • Ersdal, Gerhard; Langen, Ivar (2002). On Assessment of Existing Offshore Structures. 2002-05-26 - 2002-05-31.
  • Than, Thuong Kim; Langen, Ivar; Birkeland, Oddvar (2002). Modelling and Simulation of Offshore Crane Operations on a Floating Production Vessel. 2002-05-26 - 2002-05-31.
  • Dalane, Jan Inge; Haver, Sverre; Langen, Ivar (2000). Variability in Load and Strength for a Jack-up Structure.
  • Dalane, Jan Inge; Langen, Ivar; Schueller, G.I.; Shinozuka, M.; Yao, J.T.P. (2000). Probabilistic Inspection Planning for Offshore Structures Using Inspection Importance Measure.
  • Hellevik, Svein Gunnar; Langen, Ivar (2000). In-Service Inspection Planning of Flowlines Subjected to CO2 Corrosion.
  • Langen, Ivar; Than, Thuong Kim; Birkeland, Oddvar; Rølvåg, Terje (2000). Simulation of Dynamic Behaviour of a FPSO Crane.
  • Hellevik, Svein Gunnar; Grundy, Paul; Koo, Jay; Langen, Ivar; Ueda, Yukio (1999). Optimal Design-Phase Inspection and Replacement Planning of Pipelines Subjected to CO2 Corrosion.
  • Jakobsen, Rolf; Bai, Yong; Langen, Ivar (1999). Assessment of pipeline girth welds.
  • Hellevik, Svein Gunnar; Langen, Ivar; Sørensen, John D.; Kisisel, I.T. (1998). Cost Optimal Reliability Based Inspection and Replacement Planning of Piping.
  • Gudmestad, Ove Tobias; Langen, Ivar (1998). On the importance of carrying out physical model tests.
  • Langen, Ivar; Skjåstad, O.; Haver, S.; Vugts, J.H. (1998). Measured and Predicted Dynamic Behaviour of an Offshore Gravity Platform.