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Bernt Johan Leira
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Proceedings Papers

Nylon Ropes for Mooring of Floating Offshore Wind Turbines: The NYMOOR Project

Nuno Fonseca, Heidi Moe Føre, Stian Høegh Sørum, Rune Gaarder, Bernt Johan Leira, Rui Pedro Faria, Michael Kent
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A057, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-130846
https://doi.org/10.1115/OMAE2024-130846
View Paper titled, Nylon Ropes for Mooring of Floating Offshore Wind Turbines: The NYMOOR Project
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Topics: Floating wind turbines, Mooring, Nylon fabrics, Ropes, Stress, Wind, Design, Elasticity, Floating structures, Mechanical properties
Proceedings Papers

Numerical Modeling of a Motion-Neutralized Floater Concept for Maritime Operations

Marcelo Anunciação Jaculli, Savin Viswanathan, Christian Holden, Bernt Johan Leira, Sigbjørn Sangesland
Proc. ASME. OMAE2024, Volume 1: Offshore Technology, V001T01A006, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-126339
https://doi.org/10.1115/OMAE2024-126339
View Paper titled, Numerical Modeling of a Motion-Neutralized Floater Concept for Maritime Operations
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Topics: Computer simulation, Motion compensation, Ocean engineering, Wind, Seas, Computer software, Control systems, Degrees of freedom, Dynamics (Mechanics), Motion control
Proceedings Papers

Reliability Analysis of Crack Growth Occurrence for a Secondary Structural Component due to Vibration Excitation

Siri Kolle Kleivane, Bernt Johan Leira, Sverre Steen
Proc. ASME. OMAE2023, Volume 2: Structures, Safety, and Reliability, V002T02A042, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-104648
https://doi.org/10.1115/OMAE2023-104648
View Paper titled, Reliability Analysis of Crack Growth Occurrence for a Secondary Structural Component due to Vibration Excitation
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Topics: Event history analysis, Excitation, Fracture (Materials), Structural elements (Construction), Vibration, Hull, Engines, Fatigue cracks, Ships, Waves
Proceedings Papers

On the Structural Analysis of Icebreakers Due to Ramming of First-Year Ice Ridges

Weidong Zhao, Bernt Johan Leira, Knut Vilhelm Høyland, Ekaterina Kim, Guoqing Feng, Zhanyang Chen, Hongbin Gui
Proc. ASME. OMAE2022, Volume 6: Polar and Arctic Sciences and Technology, V006T07A029, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-79661
https://doi.org/10.1115/OMAE2022-79661
View Paper titled, On the Structural Analysis of Icebreakers Due to Ramming of First-Year Ice Ridges
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Topics: Ice, Ice ridges, Icebreakers, Ships, Structural analysis
Proceedings Papers

Scenario-Based Risk Management for Arctic Waters

Martin Bergström, Thomas Browne, Sören Ehlers, Inari Helle, Hauke Herrnring, Faisal Khan, Jan Kubiczek, Pentti Kujala, Mihkel Kõrgesaar, Bernt Johan Leira, Tuuli Parviainen, Arttu Polojärvi, Mikko Suominen, Rocky Taylor, Jukka Tuhkuri, Jarno Vanhatalo, Brian Veitch
Proc. ASME. OMAE2022, Volume 6: Polar and Arctic Sciences and Technology, V006T07A004, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-80767
https://doi.org/10.1115/OMAE2022-80767
View Paper titled, Scenario-Based Risk Management for Arctic Waters
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Topics: Arctic region, Ice, Risk management, Ships, Stress, Water
Proceedings Papers

System Uncertainty Effects on the Wave Frequency Response Of Floating Vessels Based on Polynomial Chaos Expansion

Gowtham Radhakrishnan, Xu Han, Svein Sævik, Zhen Gao, Bernt Johan Leira
Proc. ASME. OMAE2021, Volume 2: Structures, Safety, and Reliability, V002T02A016, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62542
https://doi.org/10.1115/OMAE2021-62542
View Paper titled, System Uncertainty Effects on the Wave Frequency Response Of Floating Vessels Based on Polynomial Chaos Expansion
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Topics: Chaos, Frequency-domain analysis, Polynomials, Sensitivity analysis, Uncertainty, Vessels, Wave frequency
Journal Articles

Static and Cyclic Behavior of Welded DH36 Steel and Its Application at Low Temperatures

Weidong Zhao, Guoqing Feng, Bernt Johan Leira, Huilong Ren
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. February 2022, 144(1): 011701.
Paper No: OMAE-20-1211
https://doi.org/10.1115/1.4052179
Published Online: September 15, 2021
View Article titled, Static and Cyclic Behavior of Welded DH36 Steel and Its Application at Low Temperatures
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Topics: Fatigue, Fracture (Materials), Fracture (Process), Low temperature, Steel, Temperature, Fatigue testing, Stress, Brittleness
Journal Articles

Simulating High-Mode Vortex-Induced Vibration of a Riser in Linearly Sheared Current Using an Empirical Time-Domain Model

Sang Woo Kim, Svein Sævik, Jie Wu, Bernt Johan Leira
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. August 2021, 143(4): 041901.
Paper No: OMAE-20-1127
https://doi.org/10.1115/1.4049246
Published Online: January 12, 2021
View Article titled, Simulating High-Mode Vortex-Induced Vibration of a Riser in Linearly Sheared Current Using an Empirical Time-Domain Model
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Topics: Fatigue damage, Pipeline risers, Risers (Casting), Stress, Vortex-induced vibration, Tension, Simulation
Proceedings Papers

A Sensitivity Study of Vessel Hydrodynamic Model Parameters

Xu Han, Svein Sævik, Bernt Johan Leira
Proc. ASME. OMAE2020, Volume 1: Offshore Technology, V001T01A039, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-19039
https://doi.org/10.1115/OMAE2020-19039
View Paper titled, A Sensitivity Study of Vessel Hydrodynamic Model Parameters
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Topics: Vessels, Computer simulation, Decision making, Energy industry, Inspection, Life extension, Maintenance, Uncertainty, Waves
Proceedings Papers

Effect of Wave-Current Interaction on Structural Responses of a Very Long and Side-Anchored Floating Bridge

Jian Dai, Bjørn Christian Abrahamsen, Bernt Johan Leira
Proc. ASME. OMAE2020, Volume 2B: Structures, Safety, and Reliability, V02BT02A016, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-18597
https://doi.org/10.1115/OMAE2020-18597
View Paper titled, Effect of Wave-Current Interaction on Structural Responses of a Very Long and Side-Anchored Floating Bridge
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Topics: Bridges (Structures), Structural response analysis, Waves
Proceedings Papers

Submerged Production Unit: Design and Method for Launch and Tow to Field

Venkatesan Arumugam Elumalai, Sigbjørn Daasvatn, Daniel Karunakaran, Kjell Larsen, Bernt Johan Leira
Proc. ASME. OMAE2019, Volume 5A: Pipelines, Risers, and Subsea Systems, V05AT04A046, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95291
https://doi.org/10.1115/OMAE2019-95291
View Paper titled, Submerged Production Unit: Design and Method for Launch and Tow to Field
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Topics: Design, Ocean engineering, Vessels, Buoyancy, Computer software, Construction, Cranes, Dynamic analysis, Fossil fuels, Glass reinforced plastics
Proceedings Papers

Eliminating the Uncertainties in Hydraulic and Ice Loads on Berm Breakwaters

Maria Pontiki, Bernt Johan Leira, Knut Vilhelm Høyland
Proc. ASME. OMAE2019, Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology, V008T07A010, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95139
https://doi.org/10.1115/OMAE2019-95139
View Paper titled, Eliminating the Uncertainties in Hydraulic and Ice Loads on Berm Breakwaters
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Topics: Arctic region, Breakwaters, Design, Ice, Stress, Uncertainty
Journal Articles

Long-Term Extreme Response Analysis of Marine Structures Using Inverse SORM

Finn-Idar G. Giske, Bernt Johan Leira, Ole Øiseth
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. October 2018, 140(5): 051601.
Paper No: OMAE-17-1146
https://doi.org/10.1115/1.4039718
Published Online: May 2, 2018
View Article titled, Long-Term Extreme Response Analysis of Marine Structures Using Inverse SORM
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Topics: Approximation, Marine structures, Reliability, Errors
Journal Articles

Effects of Soil Profile Variation and Scour on Structural Response of an Offshore Monopile Wind Turbine

Hui Li, Muk Chen Ong, Bernt Johan Leira, Dag Myrhaug
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. August 2018, 140(4): 042001.
Paper No: OMAE-16-1099
https://doi.org/10.1115/1.4039297
Published Online: March 14, 2018
View Article titled, Effects of Soil Profile Variation and Scour on Structural Response of an Offshore Monopile Wind Turbine
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Topics: Sands, Soil, Stress, Wind turbines, Wind, Wind waves, Ocean engineering, Water, Waves, Displacement
Proceedings Papers

Long-Term Extreme Response Analysis of Marine Structures Using Inverse SORM

Finn-Idar G. Giske, Bernt Johan Leira, Ole Øiseth
Proc. ASME. OMAE2017, Volume 3A: Structures, Safety and Reliability, V03AT02A052, June 25–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2017-61409
https://doi.org/10.1115/OMAE2017-61409
View Paper titled, Long-Term Extreme Response Analysis of Marine Structures Using Inverse SORM
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Topics: Marine structures, Reliability, Approximation, Event history analysis
Proceedings Papers

A Case Study of the Influence on Crashworthiness From the Implementation of Ice Strengthening

Halvor Larsson Aga, Bernt Johan Leira, Sören Ehlers, Hans Arne Blomvågnes-Bakke
Proc. ASME. OMAE2014, Volume 4B: Structures, Safety and Reliability, V04BT02A019, June 8–13, 2014
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2014-24127
https://doi.org/10.1115/OMAE2014-24127
View Paper titled, A Case Study of the Influence on Crashworthiness From the Implementation of Ice Strengthening
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Topics: Crashworthiness, Ice, Fuel storage, Liquefied natural gas, Ships, Collisions (Physics), Absorption, Design, Finite element analysis, Safety
Proceedings Papers

Ice Condition Database for the Arctic Sea

Tõnis Tõns, Sandro Erceg, Sören Ehlers, Bernt Johan Leira
Proc. ASME. OMAE2014, Volume 10: Polar and Arctic Science and Technology, V010T07A025, June 8–13, 2014
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2014-23761
https://doi.org/10.1115/OMAE2014-23761
View Paper titled, Ice Condition Database for the Arctic Sea
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Topics: Arctic Ocean, Databases, Ice, Satellites, Statistical analysis, Vessels