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Amir R. Nejad
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Journal Articles

Methodology for Real-Time Torque Estimation in a Ship Propulsion Digital Twin

Etienne Purcell, Amir R. Nejad, Anriëtte Bekker
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. April 2025, 147(2): 021402.
Paper No: OMAE-24-1065
https://doi.org/10.1115/1.4066412
Published Online: September 25, 2024
View Article titled, Methodology for Real-Time Torque Estimation in a Ship Propulsion Digital Twin
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Topics: Propellers, Torque, Ships, Digital twin, Artificial neural networks, Polynomials
Proceedings Papers

On Methodology for a Digital Twin of Ship Propulsion Under Harsh Environmental Conditions

Etienne Purcell, Amir R. Nejad, Angelo Böhm, Lina Sapp, Jorrid Lund, Franz von Bock und Polach, Brendon M. Nickerson, Anriëtte Bekker, Markus Gilges, Ahmed Saleh, Benjamin Lehmann, Georg Jacobs, Mostafa Valavi, Tobias Kranz
Proc. ASME. OMAE2024, Volume 6: Polar and Arctic Sciences and Technology; CFD, FSI, and AI, V006T07A024, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-124047
https://doi.org/10.1115/OMAE2024-124047
View Paper titled, On Methodology for a Digital Twin of Ship Propulsion Under Harsh Environmental Conditions
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Topics: Digital twin, Propulsion, Ships, Damage, Ice, Propellers, Engineering simulation, Engines, Modeling, Motors
Journal Articles

Virtual Model Development of the Load Application System of a Wind Turbine Nacelle Test Bench for Hybrid Test Applications

Muhammad Omer Siddiqui, Amir R. Nejad, Eilif Pedersen
Journal: Journal of Dynamic Systems, Measurement, and Control
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. March 2024, 146(2): 021002.
Paper No: DS-22-1262
https://doi.org/10.1115/1.4063846
Published Online: December 6, 2023
View Article titled, Virtual Model Development of the Load Application System of a Wind Turbine Nacelle Test Bench for Hybrid Test Applications
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Topics: Actuators, Fluids, Modeling, Stress, Valves, Wind turbines, Friction, Simulation, Model development, Cylinders
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
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 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

Dynamic Model Development of Wind Turbine Drivetrains by Using Sensor Measurements

Diederik van Binsbergen, Amir R. Nejad, Jan Helsen
Proc. ASME. OMAE2021, Volume 9: Ocean Renewable Energy, V009T09A020, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-61939
https://doi.org/10.1115/OMAE2021-61939
View Paper titled, Dynamic Model Development of Wind Turbine Drivetrains by Using Sensor Measurements
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Topics: Dynamic models, Sensors, Wind turbines, Simulation, Vibration, Bearings, Condition monitoring, Displacement, Gears, Renewable energy
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
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

On Lifetime Extension of Wind Turbine Drivetrains

Kelly Tartt, Amir R. Nejad, Abbas Kazemi-Amiri, Alasdair McDonald
Proc. ASME. OMAE2021, Volume 9: Ocean Renewable Energy, V009T09A025, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62516
https://doi.org/10.1115/OMAE2021-62516
View Paper titled, On Lifetime Extension of Wind Turbine Drivetrains
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Topics: Wind turbines, Service life (Equipment), Wind, Bearings, Carbon, Economics , Emissions, Fossil fuels, Machinery, Ocean engineering
Proceedings Papers

On Uncertainty Assessment of Fatigue Damage of Propulsion Shaft Under Ice Impact

Etienne Purcell, Amir R. Nejad, Mostafa Valavi, Anriëtte Bekker
Proc. ASME. OMAE2021, Volume 7: Polar and Arctic Sciences and Technology, V007T07A006, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62288
https://doi.org/10.1115/OMAE2021-62288
View Paper titled, On Uncertainty Assessment of Fatigue Damage of Propulsion Shaft Under Ice Impact
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Topics: Fatigue damage, Ice, Propulsion, Uncertainty, Stress, Maintenance, Condition monitoring, Design, Failure, Service life (Equipment)
Proceedings Papers

Condition Monitoring of Ship Propulsion Systems: State-of-the-Art, Development Trend and Role of Digital Twin

Amir R. Nejad, Etienne Purcell, Mostafa Valavi, Roman Hudak, Benjamin Lehmann, Francisco Gutiérrez Guzmán, Felix Behrendt, Angelo Mario Bõhm, Franz von Bock und Polach, Brendon M. Nickerson, Anriëtte Bekker, Withold Drazyk
Proc. ASME. OMAE2021, Volume 7: Polar and Arctic Sciences and Technology, V007T07A005, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-61847
https://doi.org/10.1115/OMAE2021-61847
View Paper titled, Condition Monitoring of Ship Propulsion Systems: State-of-the-Art, Development Trend and Role of Digital Twin
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Topics: Condition monitoring, Propulsion systems, Ships, Failure, Antarctic region, Arctic region, Ice, Machinery, Maintenance, Propulsion
Proceedings Papers

On State-of-the-Art and Alternative Energy-Efficient Lifting Technologies for Deep Sea Mining

Vegard Berge, Christoffer R. Helgesen, Dimitar Z. Ivanov, Marianne H. Jahren, Pauline S. Opstad, Petter S. Sletten, Amir R. Nejad
Proc. ASME. OMAE2021, Volume 5: Ocean Space Utilization, V005T05A009, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-63844
https://doi.org/10.1115/OMAE2021-63844
View Paper titled, On State-of-the-Art and Alternative Energy-Efficient Lifting Technologies for Deep Sea Mining
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Topics: Energy efficiency, Mining, Seas, Conveyor systems, Energy consumption, Pumps, Disks, Microorganisms, Oceans, Potential energy
Journal Articles

Design and Dynamic Analysis of a Compact 10 MW Medium Speed Gearbox for Offshore Wind Turbines

Shuaishuai Wang, Amir R. Nejad, Torgeir Moan
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research Papers
J. Offshore Mech. Arct. Eng. June 2021, 143(3): 032001.
Paper No: OMAE-20-1030
https://doi.org/10.1115/1.4048608
Published Online: October 27, 2020
View Article titled, Design and Dynamic Analysis of a Compact 10 MW Medium Speed Gearbox for Offshore Wind Turbines
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Topics: Mechanical drives, Design, Stress
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
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 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

Design and Dynamic Analysis of a Compact 10 MW Medium Speed Gearbox for Offshore Wind Turbines

Shuaishuai Wang, Amir R. Nejad, Torgeir Moan
Proc. ASME. IOWTC2019, ASME 2019 2nd International Offshore Wind Technical Conference, V001T01A034, November 3–6, 2019
Publisher: American Society of Mechanical Engineers
Paper No: IOWTC2019-7617
https://doi.org/10.1115/IOWTC2019-7617
View Paper titled, Design and Dynamic Analysis of a Compact 10 MW Medium Speed Gearbox for Offshore Wind Turbines
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Topics: Design, Dynamic analysis, Mechanical drives, Offshore wind turbines, Resonance, Stress, Bearings, Dynamic models, Engineering standards, Fatigue limit
Proceedings Papers

Experimental Validation of Angular Velocity Measurements for Wind Turbines Drivetrain Condition Monitoring

Farid K. Moghadam, Amir R. Nejad
Proc. ASME. IOWTC2019, ASME 2019 2nd International Offshore Wind Technical Conference, V001T01A035, November 3–6, 2019
Publisher: American Society of Mechanical Engineers
Paper No: IOWTC2019-7620
https://doi.org/10.1115/IOWTC2019-7620
View Paper titled, Experimental Validation of Angular Velocity Measurements for Wind Turbines Drivetrain Condition Monitoring
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Topics: Condition monitoring, Velocity measurement, Wind turbines, Bearings, Sensors, Turbines, Vibration, Error functions, Excitation, Gears
Proceedings Papers

On Digital Twin Condition Monitoring Approach for Drivetrains in Marine Applications

Sigrid S. Johansen, Amir R. Nejad
Proc. ASME. OMAE2019, Volume 10: Ocean Renewable Energy, V010T09A013, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95152
https://doi.org/10.1115/OMAE2019-95152
View Paper titled, On Digital Twin Condition Monitoring Approach for Drivetrains in Marine Applications
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Topics: Condition monitoring, Maintenance, Flaw detection, Modeling, Design, Stiffness, Vessels, Downtime, Ocean energy, Ocean engineering
Proceedings Papers

On Design and Analysis of a Drivetrain Test Rig for Wind Turbine Health Monitoring

Lorenzo Balestra, Amir R. Nejad, Giovanni Naldi
Proc. ASME. OMAE2019, Volume 10: Ocean Renewable Energy, V010T09A016, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96721
https://doi.org/10.1115/OMAE2019-96721
View Paper titled, On Design and Analysis of a Drivetrain Test Rig for Wind Turbine Health Monitoring
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Topics: Design, Wind turbines, Conceptual design, Dimensions, Failure, Offshore wind turbines, Damage, Downtime, Dynamometers, Flaw detection
Proceedings Papers

On Disaster Risk Reduction in Norwegian Oil and Gas Industry Through Life-Cycle Perspective

Michaela Ibrion, Nicola Paltrinieri, Amir R. Nejad
Proc. ASME. OMAE2019, Volume 3: Structures, Safety, and Reliability, V003T02A077, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95622
https://doi.org/10.1115/OMAE2019-95622
View Paper titled, On Disaster Risk Reduction in Norwegian Oil and Gas Industry Through Life-Cycle Perspective
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Topics: Cycles, Disasters, Petroleum industry, Risk reduction, Accidents, Risk, Gas industry, Life cycle assessment, Ocean engineering, Risk management
Journal Articles

Effect of Axial Acceleration on Drivetrain Responses in a Spar-Type Floating Wind Turbine

Amir R. Nejad, Erin E. Bachynski, Torgeir Moan
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. June 2019, 141(3): 031901.
Paper No: OMAE-17-1209
https://doi.org/10.1115/1.4041996
Published Online: January 17, 2019
View Article titled, Effect of Axial Acceleration on Drivetrain Responses in a Spar-Type Floating Wind Turbine
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Topics: Bearings, Floating wind turbines, Spar platforms, Stress, Wing spars, Waves, Wind velocity
Proceedings Papers

A Systematic Design Approach of Gripper’s Hydraulic System Utilized in Offshore Wind Turbine Monopile Installation

Amir R. Nejad, Lin Li, Wilson Ivan Guachamin Acero, Torgeir Moan
Proc. ASME. OMAE2018, Volume 11A: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering, V11AT12A039, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-77228
https://doi.org/10.1115/OMAE2018-77228
View Paper titled, A Systematic Design Approach of Gripper’s Hydraulic System Utilized in Offshore Wind Turbine Monopile Installation
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Topics: Design, Hydraulic drive systems, Offshore wind turbines, Stress, Actuators, Dynamic models, Power systems (Machinery), Reliability, Dynamic response, Fatigue