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Bernt J. Leira
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Journal Articles

Simultaneous Measurements From Buoys and Vessel-Mounted X-Band Radar to Study Currents and Waves at Breisundet Field

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Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Konstantinos Christakos, Johann A. Dirdal
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. December 2025, 147(6): 061202.
Paper No: OMAE-24-1143
https://doi.org/10.1115/1.4068308
Published Online: April 25, 2025
View Articletitled, Simultaneous Measurements From Buoys and Vessel-Mounted X-Band Radar to Study Currents and Waves at Breisundet Field
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Topics: Buoys, Radar, Spectra (Spectroscopy), Vessels, Waves, Currents
Proceedings Papers

Bayesian Updating by Utilization of Bayesian Optimization for Estimation of VIV Load Parameters

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Bernt J. Leira, Martin L. Andersen, Jie Wu, Svein Sævik
Proc. ASME. OMAE2024, Volume 2: Structures, Safety, and Reliability, V002T02A006, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-122594
https://doi.org/10.1115/OMAE2024-122594
View Paper titled, Bayesian Updating by Utilization of Bayesian Optimization for Estimation of VIV Load Parameters
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Topics: Optimization, Stress, Vortex-induced vibration
Proceedings Papers

Strength Analysis of Icebreak Ramming Sea Ice With Extreme Thickness Along the Northern Sea Route

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Anqi Bian, Wei Chai, Haibo Dong, Zhaolong Yu, Bernt J. Leira, Fanghuai Xiong
Proc. ASME. OMAE2024, Volume 6: Polar and Arctic Sciences and Technology; CFD, FSI, and AI, V006T07A017, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-127228
https://doi.org/10.1115/OMAE2024-127228
View Paper titled, Strength Analysis of Icebreak Ramming Sea Ice With Extreme Thickness Along the Northern Sea Route
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Topics: Sea ice, Seas, Stress
Proceedings Papers

Extreme Value Analysis of Ship Roll Motion With Consideration of Ice Accumulation

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Wei Chai, Jianzhang Qi, Bernt J. Leira, Chana Sinsabvarodom, Longxia Yang, Shunying Ji
Proc. ASME. OMAE2024, Volume 6: Polar and Arctic Sciences and Technology; CFD, FSI, and AI, V006T07A003, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-127072
https://doi.org/10.1115/OMAE2024-127072
View Paper titled, Extreme Value Analysis of Ship Roll Motion With Consideration of Ice Accumulation
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Topics: Ice, Ships, Stability, Waves
Proceedings Papers

Development of the Environmental Contour for Ice Drift Speed and Wind Speed

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Chana Sinsabvarodom, Bernt J. Leira, Knut V. Høyland, Wei Chai, Kittikun Jitpairod, Waraporn Nuntiyakul, Achara Seripienlert
Proc. ASME. OMAE2024, Volume 6: Polar and Arctic Sciences and Technology; CFD, FSI, and AI, V006T07A001, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-122581
https://doi.org/10.1115/OMAE2024-122581
View Paper titled, Development of the Environmental Contour for Ice Drift Speed and Wind Speed
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Topics: Ice, Wind velocity
Journal Articles

Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component Due to Vibration Excitation

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Siri Kolle Kleivane, Bernt J. Leira, Sverre Steen
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. October 2024, 146(5): 051702.
Paper No: OMAE-23-1097
https://doi.org/10.1115/1.4064499
Published Online: January 29, 2024
View Articletitled, Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component Due to Vibration Excitation
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Topics: Engines, Excitation, Failure, Fracture (Materials), Hull, Pipes, Probability, Reliability, Stress, Vibration
Journal Articles

Analyzing the Sensitivity of Wave Frequency Responses of Floating Vessels to Uncertain System Variables Utilizing Polynomial Chaos Expansion

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Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Xu Han
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. June 2024, 146(3): 031702.
Paper No: OMAE-23-1063
https://doi.org/10.1115/1.4063619
Published Online: December 11, 2023
View Articletitled, Analyzing the Sensitivity of Wave Frequency Responses of Floating Vessels to Uncertain System Variables Utilizing Polynomial Chaos Expansion
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Topics: Chaos, Polynomials, Vessels, Sensitivity analysis, Waves, Uncertainty
Proceedings Papers

Retrieval of Ocean Wave Spectra From X-Band Marine Radar Images Using Inversion Schemes Based on Auto-Spectral Analysis

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Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Konstantinos Christakos
Proc. ASME. OMAE2023, Volume 5: Ocean Engineering, V005T06A060, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-104877
https://doi.org/10.1115/OMAE2023-104877
View Paper titled, Retrieval of Ocean Wave Spectra From X-Band Marine Radar Images Using Inversion Schemes Based on Auto-Spectral Analysis
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Topics: Buoys, Ocean waves, Radar, Spectra (Spectroscopy), Waves, Transfer functions, Vessels, Computer simulation, Decision making, Dispersion (Optics)
Proceedings Papers

On the Relationship Between Spectral Models of Ice Drift and Wind Turbulence

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Chana Sinsabvarodom, Bernt J. Leira, Knut V. Høyland, Wei Chai, Arvid Naess, Gowtham Radhakrishnan
Proc. ASME. OMAE2023, Volume 6: Polar and Arctic Sciences and Technology, V006T07A001, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-104751
https://doi.org/10.1115/OMAE2023-104751
View Paper titled, On the Relationship Between Spectral Models of Ice Drift and Wind Turbulence
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Topics: Ice, Turbulence, Wind
Proceedings Papers

A Methodology for Tuning of Computational Vessel Models Utilizing Wave Measurements From X-Band Marine Radar and Wave Buoy

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Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Karl E. Kaasen, Konstantinos Christakos, Johann A. Dirdal
Proc. ASME. OMAE2023, Volume 2: Structures, Safety, and Reliability, V002T02A010, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-104492
https://doi.org/10.1115/OMAE2023-104492
View Paper titled, A Methodology for Tuning of Computational Vessel Models Utilizing Wave Measurements From X-Band Marine Radar and Wave Buoy
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Topics: Buoys, Entropy, Radar, Vessels, Waves
Proceedings Papers

On Design Parameters for Accidental Ice Loading on Ship Hulls

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Bernt J. Leira, Wei Chai, Gowtham Radhakrishnan
Proc. ASME. OMAE2022, Volume 6: Polar and Arctic Sciences and Technology, V006T07A031, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-81304
https://doi.org/10.1115/OMAE2022-81304
View Paper titled, On Design Parameters for Accidental Ice Loading on Ship Hulls
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Topics: Design, Hull, Ice, Ships
Proceedings Papers

Short-Term Extreme Response Prediction for a Jacket Platform Subjected to Nonlinear Wave Loads

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Wei Chai, Xiangpeng Yu, Bernt J. Leira, Jian Gu
Proc. ASME. OMAE2022, Volume 2: Structures, Safety, and Reliability, V002T02A046, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-80095
https://doi.org/10.1115/OMAE2022-80095
View Paper titled, Short-Term Extreme Response Prediction for a Jacket Platform Subjected to Nonlinear Wave Loads
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Topics: Nonlinear waves, Stress
Proceedings Papers

Motion Response Prediction of Marine Vessels Based on Hydrodynamic Models Updated Through On-Site Measurements

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Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Alojz Gomola
Proc. ASME. OMAE2022, Volume 2: Structures, Safety, and Reliability, V002T02A018, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-78912
https://doi.org/10.1115/OMAE2022-78912
View Paper titled, Motion Response Prediction of Marine Vessels Based on Hydrodynamic Models Updated Through On-Site Measurements
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Topics: Spectra (Spectroscopy), Vessels, Waves, Optimization, Uncertainty, Errors, North Sea, Ocean engineering, Physics
Proceedings Papers

Short-Term Analysis of Ship Capsizing Probability in Random Seas

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Wei Chai, Lin He, Bernt J. Leira, Chana Sinsabvarodom, Peiyuan Feng
Proc. ASME. OMAE2022, Volume 2: Structures, Safety, and Reliability, V002T02A025, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-80098
https://doi.org/10.1115/OMAE2022-80098
View Paper titled, Short-Term Analysis of Ship Capsizing Probability in Random Seas
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Topics: Probability, Seas, Ships
Proceedings Papers

A Framework for Condition Monitoring and Risk-Based Decision Support Involving a Vessel State Observer

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Xu Han, Bernt J. Leira, Svein Sævik, Gowtham Radhakrishnan, Stian Skjong, Lars T. Kyllingstad
Proc. ASME. OMAE2021, Volume 2: Structures, Safety, and Reliability, V002T02A018, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-61850
https://doi.org/10.1115/OMAE2021-61850
View Paper titled, A Framework for Condition Monitoring and Risk-Based Decision Support Involving a Vessel State Observer
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Topics: Condition monitoring, Risk, State estimation, Vessels, Sensors, Data acquisition, Inertia (Mechanics), Waves, Center of mass, Damping
Proceedings Papers

Fatigue Assessment of Mooring Chain Considering the Effects Of Mean Load and Corrosion

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Erling N. Lone, Thomas Sauder, Kjell Larsen, Bernt J. Leira
Proc. ASME. OMAE2021, Volume 2: Structures, Safety, and Reliability, V002T02A020, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62775
https://doi.org/10.1115/OMAE2021-62775
View Paper titled, Fatigue Assessment of Mooring Chain Considering the Effects Of Mean Load and Corrosion
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Topics: Chain, Corrosion, Fatigue, Mooring, Stress, Design, Engineering design processes, Fatigue life, Fatigue testing, Ocean engineering
Proceedings Papers

Probabilistic Fatigue Assessment of a Mooring Line Based on Station-Keeping Trials in Ice

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Chana Sinsabvarodom, Bernt J. Leira, Wei Chai, Arvid Naess
Proc. ASME. OMAE2021, Volume 7: Polar and Arctic Sciences and Technology, V007T07A015, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62924
https://doi.org/10.1115/OMAE2021-62924
View Paper titled, Probabilistic Fatigue Assessment of a Mooring Line Based on Station-Keeping Trials in Ice
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Topics: Fatigue, Ice, Mooring, Stress
Proceedings Papers

Influence of Mean Tension on Mooring Line Fatigue Life

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Erling N. Lone, Bernt J. Leira, Thomas Sauder, Vegard Aksnes, Øystein Gabrielsen, Kjell Larsen
Proc. ASME. OMAE2020, Volume 2A: Structures, Safety, and Reliability, V02AT02A053, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-18628
https://doi.org/10.1115/OMAE2020-18628
View Paper titled, Influence of Mean Tension on Mooring Line Fatigue Life
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Topics: Fatigue life, Mooring, Tension, Stress, Design, Fatigue damage, Semi-submersible offshore structures, Chain, Cycles, Engineering simulation
Proceedings Papers

Future Scenarios for Arctic Shipping

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Martin Bergström, Bernt J. Leira, Pentti Kujala
Proc. ASME. OMAE2020, Volume 7: Polar and Arctic Sciences and Technology, V007T07A006, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-18166
https://doi.org/10.1115/OMAE2020-18166
View Paper titled, Future Scenarios for Arctic Shipping
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Topics: Arctic region, Climate change, Natural resources
Proceedings Papers

Dynamic Behavior of a Novel Heave-Compensated Floating Platform for Well Interventions

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Marcelo A. Jaculli, Bernt J. Leira, Sigbjørn Sangesland, Celso K. Morooka, José Ricardo P. Mendes
Proc. ASME. OMAE2020, Volume 11: Petroleum Technology, V011T11A051, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-18472
https://doi.org/10.1115/OMAE2020-18472
View Paper titled, Dynamic Behavior of a Novel Heave-Compensated Floating Platform for Well Interventions
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Topics: Buoyancy, Cables, Design, Displacement, Drilling, Drillships, Floating structures, Modeling, North Sea, Pipeline risers