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Proceedings Papers

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

Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Karl E. Kaasen, Konstantinos Christakos, Johann A. Dirdal
Publisher: American Society of Mechanical Engineers
Proc. ASME. OMAE2023, Volume 2: Structures, Safety, and Reliability, V002T02A010, June 11–16, 2023
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

Gowtham Radhakrishnan, Bernt J. Leira, Zhen Gao, Svein Sævik, Konstantinos Christakos
Publisher: American Society of Mechanical Engineers
Proc. ASME. OMAE2023, Volume 5: Ocean Engineering, V005T06A060, June 11–16, 2023
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

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
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

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

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
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

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

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
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

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

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
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

Felix C. Mehlan, Amir R. Nejad, Zhen Gao
Journal: Journal of Offshore Mechanics and Arctic Engineering
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 Article titled, 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

Felix C. Mehlan, Amir R. Nejad, Zhen Gao
Proc. ASME. OMAE2021, Volume 9: Ocean Renewable Energy, V009T09A021, June 21–30, 2021
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

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
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

Torgeir Moan, Zhen Gao, Erin E. Bachynski, Amir R. Nejad
Journal: Journal of Offshore Mechanics and Arctic Engineering
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 Article titled, 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

Extreme Response Analysis of an End-Anchored Floating Bridge

Zhengshun Cheng, Zhen Gao, Torgeir Moan
Proc. ASME. OMAE2019, Volume 7A: Ocean Engineering, V07AT06A051, June 9–14, 2019
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
Proceedings Papers

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

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
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
Journal Articles

Loading and Blade Deflection of a Tidal Turbine in Waves

Xiaoxian Guo, Zhen Gao, Xin Li, Jianmin Yang, Torgeir Moan
Journal: Journal of Offshore Mechanics and Arctic Engineering
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 Article titled, 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

Yuna Zhao, Zhengshun Cheng, Zhen Gao, Torgeir Moan
Proc. ASME. IOWTC2018, ASME 2018 1st International Offshore Wind Technical Conference, V001T01A040, November 4–7, 2018
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
Proceedings Papers

Parametric Study of a Counter Weight Suspension System for the TetraSpar Floating Wind Turbine

Brandon T. Pereyra, Zhiyu Jiang, Zhen Gao, Morten T. Andersen, Henrik Stiesdal
Proc. ASME. IOWTC2018, ASME 2018 1st International Offshore Wind Technical Conference, V001T01A003, November 4–7, 2018
Paper No: IOWTC2018-1079
https://doi.org/10.1115/IOWTC2018-1079
View Paper titled, Parametric Study of a Counter Weight Suspension System for the TetraSpar Floating Wind Turbine
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Topics: Floating wind turbines, Suspension systems, Weight (Mass), Design, Chain, Stress, Center of mass, Mass production, Modeling, Stiffness
Proceedings Papers

Dynamic Response Analysis of a Floating Bridge Subjected to Environmental Loads

Zhengshun Cheng, Zhen Gao, Torgeir Moan
Proc. ASME. OMAE2018, Volume 7A: Ocean Engineering, V07AT06A052, June 17–22, 2018
Paper No: OMAE2018-77590
https://doi.org/10.1115/OMAE2018-77590
View Paper titled, Dynamic Response Analysis of a Floating Bridge Subjected to Environmental Loads
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Topics: Bridges (Structures), Dynamic response analysis, Stress, Waves, Wind, Design, Cables, Computer simulation, Damping, Girders
Proceedings Papers

Hydro-Elastic Analysis of a Floating Bridge in Waves Considering the Effect of the Hydrodynamic Coupling and the Shore Sides

Shi Deng, Shixiao Fu, Torgeir Moan, Wei Wei, Zhen Gao
Proc. ASME. OMAE2018, Volume 1: Offshore Technology, V001T01A039, June 17–22, 2018
Paper No: OMAE2018-78738
https://doi.org/10.1115/OMAE2018-78738
View Paper titled, Hydro-Elastic Analysis of a Floating Bridge in Waves Considering the Effect of the Hydrodynamic Coupling and the Shore Sides
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Topics: Bridges (Structures), Waves, Finite element methods, Flow (Dynamics), Stress, Boundary-value problems, Degrees of freedom, Displacement, Dynamics (Mechanics), Equations of motion
Proceedings Papers

A Global-Local Damage Assessment Methodology for Impact Damage on Offshore Wind Turbine Blades During Lifting Operations

Amrit Shankar Verma, Philipp Ulrich Haselbach, Nils Petter Vedvik, Zhen Gao
Proc. ASME. OMAE2018, Volume 10: Ocean Renewable Energy, V010T09A064, June 17–22, 2018
Paper No: OMAE2018-78218
https://doi.org/10.1115/OMAE2018-78218
View Paper titled, A Global-Local Damage Assessment Methodology for Impact Damage on Offshore Wind Turbine Blades During Lifting Operations
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Topics: Blades, Damage, Damage assessment, Offshore wind turbines, Delamination, Failure mechanisms, Vessels, Shells, Wind turbines, Composite materials
Proceedings Papers

An Analytical Model of Floating Offshore Wind Turbine Blades Considering Bending-Torsion Coupling Effect

Xiaoqi Qu, Yougang Tang, Zhen Gao, Yan Li, Liqin Liu
Proc. ASME. OMAE2018, Volume 10: Ocean Renewable Energy, V010T09A088, June 17–22, 2018
Paper No: OMAE2018-78571
https://doi.org/10.1115/OMAE2018-78571
View Paper titled, An Analytical Model of Floating Offshore Wind Turbine Blades Considering Bending-Torsion Coupling Effect
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Topics: Blades, Offshore wind turbines, Torsion, Nonlinear vibration, Deformation, Dynamic response, Eigenvalues, Hamilton's principle, Partial differential equations, Rotating blades
Proceedings Papers

A Summary of the Recent Work at NTNU on Marine Operations Related to Installation of Offshore Wind Turbines

Zhen Gao, Amrit Verma, Yuna Zhao, Zhiyu Jiang, Zhengru Ren
Proc. ASME. OMAE2018, Volume 11A: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering, V11AT12A044, June 17–22, 2018
Paper No: OMAE2018-78334
https://doi.org/10.1115/OMAE2018-78334
View Paper titled, A Summary of the Recent Work at NTNU on Marine Operations Related to Installation of Offshore Wind Turbines
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Topics: Offshore wind turbines, Blades, Damage, Vessels, Wind turbines, Dynamic response, Rotors, Composite materials, Cranes, Engineering simulation