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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

Application of Plasma Arc Cutting Technology in Dismantling of Large Metal Components in Containment Building

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Naizhe Zhang, Weishuai Wang, Zhen Gao, Hai Liu, Xuegang Liu
Proc. ASME. ICONE31, Volume 8: Decontamination and Decommissioning, Radiation Protection, and Waste Management, V008T09A017, August 4–8, 2024
Publisher: American Society of Mechanical Engineers
Paper No: ICONE31-135612
https://doi.org/10.1115/ICONE31-135612
View Paper titled, Application of Plasma Arc Cutting Technology in Dismantling of Large Metal Components in Containment Building
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Topics: Containment buildings, Metalwork, Nuclear decommissioning, Nuclear reactors, Plasma arc cutting
Proceedings Papers

Model Test of a Semi-Submersible Floating Wind Turbine: Hydrodynamic Motions and Internal Loads

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Yucong Jiang, Xiang Yuan Zheng, Shuaishuai Wang, Mengyang Zhao, Sheng Zhang, Torgeir Moan, Zhen Gao, Wei Li
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A055, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-129881
https://doi.org/10.1115/OMAE2024-129881
View Paper titled, Model Test of a Semi-Submersible Floating Wind Turbine: Hydrodynamic Motions and Internal Loads
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Topics: Floating wind turbines, Semi-submersible offshore structures, Stress
Proceedings Papers

Optimization of Offshore FPV Modules in Early Design Phase

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Jingzhe Jin, Liqing Zhang, Zhiliang Lin, Jiehong Kong, Zhen Gao
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A090, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-121546
https://doi.org/10.1115/OMAE2024-121546
View Paper titled, Optimization of Offshore FPV Modules in Early Design Phase
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Topics: Design, Manufacturing, Ocean engineering, Optimization
Proceedings Papers

Analysis of Static, Dynamic, Global, and Local Load Effects for Ultimate Limit State Assessment of Semi-Submersible Hulls of Floating Wind Turbines

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Shuaishuai Wang, Torgeir Moan, Shan Gao, Wei Li, Zhen Gao
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A044, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-127745
https://doi.org/10.1115/OMAE2024-127745
View Paper titled, Analysis of Static, Dynamic, Global, and Local Load Effects for Ultimate Limit State Assessment of Semi-Submersible Hulls of Floating Wind Turbines
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Topics: Floating wind turbines, Hull, Pressure, Semi-submersible offshore structures, Stress
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

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

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

Effects of Aggregation on Gravity Settlement of Submicron Aerosols Under High Temperature and High Humidity Conditions

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Jun Yan Chen, Pu Zhen Gao, Hai Feng Gu, Hui Yu Yu
Proc. ASME. ICONE29, Volume 15: Student Paper Competition, V015T16A074, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-92065
https://doi.org/10.1115/ICONE29-92065
View Paper titled, Effects of Aggregation on Gravity Settlement of Submicron Aerosols Under High Temperature and High Humidity Conditions
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Topics: Aerosols, Gravity (Force), High temperature
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

Analysis of a Hybrid Mooring System Concept for a Semi-Submersible Wind Turbine in Intermediate Water Depth Under Operational, Extreme, and Yaw Error Conditions

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Qun Cao, Erin E. Bachynski-Polić, Zhen Gao, Longfei Xiao, Zhengshun Cheng, Mingyue Liu
Proc. ASME. OMAE2022, Volume 8: Ocean Renewable Energy, V008T09A017, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-78666
https://doi.org/10.1115/OMAE2022-78666
View Paper titled, Analysis of a Hybrid Mooring System Concept for a Semi-Submersible Wind Turbine in Intermediate Water Depth Under Operational, Extreme, and Yaw Error Conditions
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Topics: Errors, Mooring, Semi-submersible offshore structures, Water, Wind turbines, Yaw, Wind, Surges, Tension, Waves
Proceedings Papers

Dynamic Property of a Floating Multi-Body System for Dual Barge Float-Over Operation With a Mechanical TLS (Topside Lifting System)

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Shujie Zhao, Zhen Gao, Dejiang Li, Xun Meng
Proc. ASME. OMAE2022, Volume 5B: Ocean Engineering; Honoring Symposium for Professor Günther F. Clauss on Hydrodynamics and Ocean Engineering, V05BT06A012, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-78400
https://doi.org/10.1115/OMAE2022-78400
View Paper titled, Dynamic Property of a Floating Multi-Body System for Dual Barge Float-Over Operation With a Mechanical TLS (Topside Lifting System)
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Topics: Multibody systems, Stress, Motion compensation, Waves, Couplings, Dampers, Degrees of freedom, Design, Eigenvalues, Fluid-dynamic forces
Journal Articles

Digital Twin Based Virtual Sensor for Online Fatigue Damage Monitoring in Offshore Wind Turbine Drivetrains

Open Access
Felix C. Mehlan, Amir R. Nejad, Zhen Gao
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. December 2022, 144(6): 060901.
Paper No: OMAE-21-1149
https://doi.org/10.1115/1.4055551
Published Online: October 3, 2022
View Articletitled, Digital Twin Based Virtual Sensor for Online Fatigue Damage Monitoring in Offshore Wind Turbine Drivetrains
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Topics: Bearings, Fatigue damage, Sensors, Stress, Kalman filters, Digital twin, Dynamics (Mechanics), Wind turbines, Mechanical drives, Simulation
Proceedings Papers

Estimation of Wind Turbine Gearbox Loads for Online Fatigue Monitoring Using Inverse Methods

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Felix C. Mehlan, Amir R. Nejad, Zhen Gao
Proc. ASME. OMAE2021, Volume 9: Ocean Renewable Energy, V009T09A021, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62181
https://doi.org/10.1115/OMAE2021-62181
View Paper titled, Estimation of Wind Turbine Gearbox Loads for Online Fatigue Monitoring Using Inverse Methods
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Topics: Fatigue, Mechanical drives, Stress, Wind turbines, Fatigue damage, Bearings, Dynamics (Mechanics), Generators, Simulation, Torque measurement
Proceedings Papers

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

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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

Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective

Open Access
Torgeir Moan, Zhen Gao, Erin E. Bachynski, Amir R. Nejad
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. October 2020, 142(5): 052002.
Paper No: OMAE-19-1099
https://doi.org/10.1115/1.4046196
Published Online: March 26, 2020
View Articletitled, Recent Advances in Integrated Response Analysis of Floating Wind Turbines in a Reliability Perspective
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Topics: Blades, Design, Floating wind turbines, Stress, Uncertainty, Wind turbines, Wind, Reliability, Waves, Inspection
Proceedings Papers

Structural Safety Assessment of Marine Operations From a Long-Term Perspective: A Case Study of Offshore Wind Turbine Blade Installation

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Amrit Shankar Verma, Zhen Gao, Zhiyu Jiang, Zhengru Ren, Nils Petter Vedvik
Proc. ASME. OMAE2019, Volume 3: Structures, Safety, and Reliability, V003T02A074, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96686
https://doi.org/10.1115/OMAE2019-96686
View Paper titled, Structural Safety Assessment of Marine Operations From a Long-Term Perspective: A Case Study of Offshore Wind Turbine Blade Installation
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Topics: Blades, Offshore wind turbines, Safety, Ocean engineering, Probability, Seas, Failure, Structural failures, Crane barges, Damage
Proceedings Papers

Extreme Response Analysis of an End-Anchored Floating Bridge

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Zhengshun Cheng, Zhen Gao, Torgeir Moan
Proc. ASME. OMAE2019, Volume 7A: Ocean Engineering, V07AT06A051, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96793
https://doi.org/10.1115/OMAE2019-96793
View Paper titled, Extreme Response Analysis of an End-Anchored Floating Bridge
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Topics: Bridges (Structures), Structural response analysis, Design, Cables, Engineering simulation, Girders, Seas, Simulation
Journal Articles

Loading and Blade Deflection of a Tidal Turbine in Waves

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Xiaoxian Guo, Zhen Gao, Xin Li, Jianmin Yang, Torgeir Moan
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. August 2019, 141(4): 041902.
Paper No: OMAE-17-1202
https://doi.org/10.1115/1.4041998
Published Online: January 17, 2019
View Articletitled, Loading and Blade Deflection of a Tidal Turbine in Waves
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Topics: Blades, Deflection, Waves, Tidal turbines, Stress
Proceedings Papers

Effect of Foundation Modeling of a Jack-Up Crane Vessel on the Dynamic Motion Response of an Offshore Wind Turbine Blade During Installation

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Yuna Zhao, Zhengshun Cheng, Zhen Gao, Torgeir Moan
Proc. ASME. IOWTC2018, ASME 2018 1st International Offshore Wind Technical Conference, V001T01A040, November 4–7, 2018
Publisher: American Society of Mechanical Engineers
Paper No: IOWTC2018-1010
https://doi.org/10.1115/IOWTC2018-1010
View Paper titled, Effect of Foundation Modeling of a Jack-Up Crane Vessel on the Dynamic Motion Response of an Offshore Wind Turbine Blade During Installation
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Topics: Blades, Crane barges, Jack-up drilling rigs, Modeling, Offshore wind turbines, Soil, Cranes, Vessels, Ocean engineering, Stress