Zhen Gao

About

BASIC INFORMATION

Currently, I am a full professor on Marine Structures at the Department of Marine Technology, Norwegian University of Science and Technology (NTNU). I am also affiliated with Centre for Autonomous Marine Operations and Systems (SFF AMOS), Centre for Marine Operations in Virtual Environments (SFI MOVE), Centre for Floating Structures for the Next Generation Ocean Industries (SFI BLUES), Norwegian Research Centre on Wind Energy (FME NorthWind). Since 2020, I am a member of the Norwegian Academy of Technological Sciences (NTVA).

I obtained my bachelor and MSc degrees in Naval Architecture and Ocean Engineering from Shanghai Jiao Tong University (SJTU) in China in 2000 and 2003, respectively. My MSc study focused on numerical simulations of ship-ship and ship-bridge collisions. The thesis title is "Numerical Simulation of Ship Collision and Study on Crashworthiness of FPSO's Side Structures". My supervisor was Professor Yongning Gu.

I obtained my PhD degree at NTNU on Marine Technology in 2008, with the thesis entitled "Stochastic Response Analysis of Mooring Systems with Emphasis on Frequency-domain Analysis of Fatigue due to Wide-band Response Processes". My PhD supervisor was Professor Torgeir Moan.

From 2008 to 2015, I was employed as a post-doc, a reseacher and then an adjunct associate professor at NTNU, before I became a full professor in July 2015.

RESEARCH FIELDS AND INTERESTS

Offshore Renewable Energy: numerical and experimental study of offshore wind turbines (both bottom-fixed and floating), wave energy converters (oscillating bodies and overtopping devices), tidal turbines and combined concepts; integrated methods for global dynamic load and response analysis of offshore wind turbines; hierarchical methods for local response analysis of wind turbine drivetrains; design and analysis of floating structures to support large-scale (5-15 MW) wind turbines; modeling and analysis of offshore wind turbines with geared drivetrain, direct drive and hydraulic transmission; mooring system design and analysis for offshore renewable energy platforms, including shallow waters.

Marine Operations: operational and safety criteria for marine operations related to offshore wind turbine transport, installation and access for maintenance and repair; numerical modeling and time-domain simulation of installation operation for offshore wind turbine components (such as crane operations for installing wind turbine blades, monopile, jacket and spar foundations); weather window and operability assessment using response-based criteria; assessment of uncertainties in numerical modelling and weather forecast and their effects on decision-making for marine operations.

Structural Mechanics and Dynamics: dynamic analysis of offshore structures using finite element methods; coupled mooring analysis; fatigue assessment of offshore structures; numerical simulation of ship collision and grounding.

Stochastic Analysis: frequency-domain cycle counting methods for fatigue analysis of wide-band processes; extreme value prediction and fatigue analysis of non-Gaussian processes; stochastic modeling of random waves, including spatially inhomogeneous waves; short-term and long-term statistics of wind and waves and their induced loads/responses; contour line or surface methods for long-term extreme responses of marine structures under separate or simultaneous wind and wave loads.

Machine Learning Approaches and Data-driven Models Applied in Marine Technology: forecast of short-term (1-hour to 1-day ahead) wind and wave conditions using machine-learning approaches for decision-making for execution of marine operations; forecasting of short-term (1-3 wave periods ahead) motions of vessels and wave energy converters for control purpose; machine learning approaches for fault/failure detection and diagnosis for wind turbine drivetrain/blade pitch actuator and marine structural components (such as mooring lines).

Reliability and Risk Analysis: uncertainty modeling and structural reliability assessment of offshore oil and gas platforms as well as renewable energy platforms; fatigue reliability methods applied to mechanical components (such as gearbox in wind turbines); fatigue reliability analysis of offshore wind turbine foundations (such as jacket) for inspection and maintenance planning; overload and fatigue reliability of mooring system.

Publications

2008

Gao, Zhen. (2008) Stochastic Response Analysis of Mooring Systems with Emphasis on Frequency-domain Analysis of Fatigue due to Wide-band Response Processes. 2008. ISBN 9788247159835. Doktoravhandlinger ved NTNU (2008:11).
Doctoral dissertation

Journal publications

Cao, Qun; Bachynski-Polic, Erin Elizabeth; Gao, Zhen; Xiao, Longfei; Cheng, Zhengshun; Liu, Mingyue. (2022) Experimental and numerical analysis of wind field effects on the dynamic responses of the 10 MW SPIC floating wind turbine concept. Ocean Engineering. volum 261.
Academic article
Zhao, Shujie; Meng, Xun; Gao, Zhen; Li, Huajun. (2022) Numerical modeling of nonstationary hydrodynamic forces and induced motions of a coupled offshore floating installation system. Ocean Engineering. volum 246.
Academic article
Cheng, Zhengshun; Svangstu, Erik; Moan, Torgeir; Gao, Zhen. (2021) Assessment of inhomogeneity in environmental conditions in a Norwegian fjord for design of floating bridges. Ocean Engineering. volum 220.
Academic article
Cho, Seongpil; Choi, Minjoo; Gao, Zhen; Moan, Torgeir. (2021) Fault detection and diagnosis of a blade pitch system in a floating wind turbine based on Kalman filters and artificial neural networks. Renewable Energy. volum 169.
Academic article
Ren, Zhengru; Skjetne, Roger; Verma, Amrit Shankar; Jiang, Zhiyu; Gao, Zhen; Halse, Karl Henning. (2021) Active heave compensation of floating wind turbine installation using a catamaran construction vessel. Marine Structures. volum 75.
Academic article
Touzon, Imanol; Nava, Vincenzo; Gao, Zhen; Petuya, Victor. (2021) Frequency domain modelling of a coupled system of floating structure and mooring Lines: An application to a wave energy converter. Ocean Engineering. volum 220.
Academic article
Wu, Mengning; Gao, Zhen. (2021) Methodology for developing a response-based correction factor (alpha-factor) for allowable sea state assessment of marine operations considering weather forecast uncertainty. Marine Structures. volum 79 (103050).
Academic article
Xu, Kun; Larsen, Kjell; Shao, Yanlin; Zhang, Min; Gao, Zhen; Moan, Torgeir. (2021) Design and comparative analysis of alternative mooring systems for floating wind turbines in shallow water with emphasis on ultimate limit state design. Ocean Engineering. volum 219.
Academic article
Cheng, Zhengshun; Gao, Zhen; Moan, Torgeir. (2020) Extreme responses and associated uncertainties for a long end-anchored floating bridge. Engineering structures. volum 219.
Academic article
Jiang, Zhiyu; Yttervik, Rune; Gao, Zhen; Sandvik, Peter Christian. (2020) Design, Modelling and Analysis of a Large Floating Dock for Spar Floating Wind Turbine Installation. Marine Structures. volum 72.
Academic article
Moan, Torgeir; Gao, Zhen; Bachynski, Erin Elizabeth; Rasekhi Nejad, Amir. (2020) Recent Advances in Integrated Response Analsysis of Floating Wind Turbines in a Reliability Perspective. Journal of Offshore Mechanics and Arctic Engineering. volum 142 (5).
Academic article
Ren, Zhengru; Skjetne, Roger; Jiang, Zhiyu; Gao, Zhen. (2020) Active Single-Blade Installation Using Tugger Line Tension Control and Optimal Control Allocation. International Journal of Offshore and Polar Engineering. volum 30 (2).
Academic article
Wu, Mengning; Stefanakos, Christos; Gao, Zhen. (2020) Multi-step-ahead forecasting of wave conditions based on a physics-based machine learning (PBML) model for marine operations. Journal of Marine Science and Engineering. volum 8 (12).
Academic article
Cheng, Zhengshun; Gao, Zhen; Moan, Torgeir. (2019) Numerical Modeling and Dynamic Analysis of a Floating Bridge Subjected to Wind, Wave, and Current Loads. Journal of Offshore Mechanics and Arctic Engineering. volum 141 (1).
Academic article
Cheng, Zhengshun; Svangstu, Erik; Gao, Zhen; Moan, Torgeir. (2019) Field Measurements of Inhomogeneous Wave Conditions in Bjørnafjorden. Journal of waterway, port, coastal, and ocean engineering. volum 145 (1).
Academic article
Guo, Xiaoxian; Gao, Zhen; Li, Xin; Yang, Jianmin; Moan, Torgeir. (2019) Loading and blade deflection of a tidal turbine in waves. Journal of Offshore Mechanics and Arctic Engineering. volum 141 (4).
Academic article
Li, Liang; Gao, Zhen; Yuan, Zhi-Ming. (2019) On the sensitivity and uncertainty of wave energy conversion with an artificial neural-network-based controller. Ocean Engineering. volum 183.
Academic article
Verma, Amrit Shankar; Jiang, Zhiyu; Ren, Zhengru; Gao, Zhen; Vedvik, Nils Petter. (2019) Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines. Energies. volum 12 (10).
Academic article
Verma, Amrit Shankar; Vedvik, Nils Petter; Gao, Zhen. (2019) A comprehensive numerical investigation of the impact behaviour of an offshore wind turbine blade due to impact loads during installation. Ocean Engineering. volum 172 (C).
Academic article
Verma, Amrit Shankar; Vedvik, Nils Petter; Haselbach, Philipp Ulrich; Gao, Zhen; Jiang, Zhiyu. (2019) Comparison of numerical modelling techniques for impact investigation on a wind turbine blade. Composite structures. volum 209.
Academic article
Wu, Mengning; Stefanakos, Christos; Gao, Zhen; Haver, Sverre Kristian. (2019) Prediction of short-term wind and wave conditions for marine operations using a multi-step-ahead decomposition-ANFIS model and quantification of its uncertainty. Ocean Engineering. volum 188.
Academic article
Xu, Kun; Min, Zhang; Shao, Yanlin; Gao, Zhen; Moan, Torgeir. (2019) Effect of wave nonlinearity on fatigue damage and extreme responses of a semi-submersible floating wind turbine. Applied Ocean Research. volum 91.
Academic article
Zhao, Yuna; Cheng, Zhengshun; Gao, Zhen; Sandvik, Peter Christian; Moan, Torgeir. (2019) Numerical study on the feasibility of offshore single blade installation by floating crane vessels. Marine Structures. volum 64.
Academic article
Cheng, Zhengshun; Gao, Zhen; Moan, Torgeir. (2018) Wave load effect analysis of a floating bridge in a fjord considering inhomogeneous wave conditions. Engineering structures. volum 163.
Academic article
Ghane, Mahdi; Nejad, Amir Rasekhi; Blanke, Mogens; Gao, Zhen; Moan, Torgeir. (2018) Condition monitoring of spar‐type floating wind turbine drivetrain using statistical fault diagnosis. Wind Energy. volum 21 (7).
Academic article
Guo, Xiaoxian; Yang, Jianmin; Gao, Zhen; Moan, Torgeir; Lu, Haining. (2018) The Surface Wave Effects on the Performance and the Loading of a Tidal Turbine. Ocean Engineering. volum 156.
Academic article
Jiang, Zhiyu; Li, Lin; Gao, Zhen; Halse, Karl Henning; Sandvik, Peter Christian. (2018) Dynamic response analysis of a catamaran installation vessel during the positioning of a wind turbine assembly onto a spar foundation. Marine Structures. volum 61.
Academic article
Li, Qinyuan; Ren, Nianxin; Gao, Zhen; Moan, Torgeir. (2018) Efficient Determination of the Long-term Extreme Responses by the Modified Environmental Contour Method for a Combined Wind Turbine and Wave Energy Converter System. Journal of Ocean Engineering and Marine Energy. volum 4 (2).
Academic article
Luan, Chenyu; Gao, Zhen; Moan, Torgeir. (2018) Comparative analysis of numerically simulated and experimentally measured motions and sectional forces and moments in a floating wind turbine hull structure subjected to combined wind and wave loads. Engineering structures. volum 177.
Academic article
Zhao, Yuna; Cheng, Zhengshun; Sandvik, Peter Christian; Gao, Zhen; Moan, Torgeir. (2018) An integrated dynamic analysis method for simulating installation of single blades for wind turbines. Ocean Engineering. volum 152.
Academic article
Cheng, Zhengshun; Madsen, Helge A.; Gao, Zhen; Moan, Torgeir. (2017) A fully coupled method for numerical modeling and dynamic analysis of floating vertical axis wind turbines. Renewable Energy. volum 107.
Academic article
Ghane, Mahdi; Nejad, Amir Rasekhi; Blanke, Mogens; Gao, Zhen; Moan, Torgeir. (2017) Diagnostic monitoring of drivetrain in a 5 MW spar-type floating wind turbine using Hilbert spectral analysis. Energy Procedia. volum 137.
Academic article
Li, Qinyuan; Gao, Zhen; Moan, Torgeir. (2017) Modified environmental contour method to determine the long-term extreme responses of a semi-submersible wind turbine. Ocean Engineering. volum 142.
Academic article
Luan, Chenyu; Chabaud, Valentin Bruno; Bachynski, Erin Elizabeth; Gao, Zhen; Moan, Torgeir. (2017) Experimental validation of a time-domain approach for determining sectional loads in a floating wind turbine hull subjected to moderate waves. Energy Procedia. volum 137.
Academic article
Luan, Chenyu; Gao, Zhen; Moan, Torgeir. (2017) Development and verification of a time-domain approach for determining forces and moments in structural components of floaters with an application to floating wind turbines. Marine Structures. volum 51.
Academic article
Verma, Amrit Shankar; Vedvik, Nils Petter; Gao, Zhen. (2017) Numerical assessment of wind turbine blade damage due to contact/impact with tower during installation. IOP Conference Series: Materials Science and Engineering. volum 276.
Academic article
Wan, Ling; Greco, Marilena; Lugni, Claudio; Gao, Zhen; Moan, Torgeir. (2017) A combined wind and wave energy-converter concept in survival mode: Numerical and experimental study in regular waves with a focus on water entry and exit. Applied Ocean Research. volum 63.
Academic article
Etemaddar, Mahmoud; Blanke, Mogens; Gao, Zhen; Moan, Torgeir. (2016) Response analysis and comparison of a spar-type floating offshore wind turbine and an onshore wind turbine under blade pitch controller faults. Wind Energy. volum 19 (1).
Academic article
Gao, Zhen; Moan, Torgeir; Wan, Ling; Michailidis, Konstantinos. (2016) Comparative Numerical and Experimental Study of two Combined Wind and Wave Energy Concepts. Journal of Ocean Engineering and Science. volum 1 (1).
Academic article
Ghane, Mahdi; Rasekhi Nejad, Amir; Blanke, Mogens; Gao, Zhen; Moan, Torgeir. (2016) Statistical fault diagnosis of wind turbine drivetrain applied to a 5MW floating wind turbine. Journal of Physics: Conference Series (JPCS). volum 753.
Academic article
Guachamin Acero, Wilson Ivan; Li, Lin; Gao, Zhen; Moan, Torgeir. (2016) Methodology for assessment of the operational limits and operability of marine operations. Ocean Engineering. volum 125.
Academic article
Li, Qinyuan; Gao, Zhen; Moan, Torgeir. (2016) Modified environmental contour method for predicting long-term extreme responses of bottom-fixed offshore wind turbines. Marine Structures. volum 48.
Academic article
Michailidis, Konstantinos; Gao, Zhen; Moan, Torgeir. (2016) Experimental and numerical study of the response of the offshore combined wind/wave energy concept SFC in extreme environmental conditions. Marine Structures. volum 50.
Academic article
Michailidis, Konstantinos; Gao, Zhen; Moan, Torgeir. (2016) Experimental study of the functionality of a semisubmersible wind turbine combined with flap-type Wave Energy Converters. Renewable Energy. volum 93.
Academic article
Rasekhi Nejad, Amir; Guo, Yi; Gao, Zhen; Moan, Torgeir. (2016) Development of a 5 MW reference gearbox for offshore wind turbines. Wind Energy. volum 19 (6).
Academic article
Shi, Wei; Tan, Xiang; Gao, Zhen; Moan, Torgeir. (2016) Numerical study of ice-induced loads and responses of a monopile-type offshore wind turbine in parked and operating conditions. Cold Regions Science and Technology. volum 123.
Academic article
Wan, Ling; Gao, Zhen; Moan, Torgeir; Lugni, Claudio. (2016) Comparative experimental study of the survivability of a combined wind and wave energy converter in two testing facilities. Ocean Engineering. volum 111.
Academic article
Jiang, Zhiyu; Gao, Zhen; Moan, Torgeir. (2015) A comparative study of shutdown procedures on the dynamic responses of wind turbines. Journal of Offshore Mechanics and Arctic Engineering. volum 137 (1).
Academic article
Li, Lin; Gao, Zhen; Moan, Torgeir. (2015) Joint Distribution of Environmental Condition at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices. Journal of Offshore Mechanics and Arctic Engineering. volum 137 (3).
Academic article
Rasekhi Nejad, Amir; Bachynski, Erin Elizabeth; Kvittem, Marit Irene; Luan, Chenyu; Gao, Zhen; Moan, Torgeir. (2015) Stochastic dynamic load effect and fatigue damage analysis of drivetrains in land-based and TLP, spar and semi-submersible floating wind turbines. Marine Structures. volum 42.
Academic article
Li, Lin; Gao, Zhen; Moan, Torgeir; Ormberg, Harald. (2014) Analysis of lifting operation of a monopile for an offshore wind turbine considering vessel shielding effects. Marine Structures. volum 39.
Academic article
Rasekhi Nejad, Amir; Gao, Zhen; Moan, Torgeir. (2014) On long-term fatigue damage and reliability analysis of gears under wind loads in offshore wind turbine drivetrains. International Journal of Fatigue. volum 61.
Academic article
Muliawan, Made Jaya; Gao, Zhen; Moan, Torgeir. (2013) Application of the Contour Line Method for Estimating Extreme Responses in the Mooring Lines of a Two-Body Floating Wave Energy Converter. Journal of Offshore Mechanics and Arctic Engineering. volum 135 (3).
Academic article
Muliawan, Made Jaya; Gao, Zhen; Moan, Torgeir; Babarit, Aurélien. (2013) Analysis of a Two-Body Floating Wave Energy Converter with Particular Focus on the Effects of Power Take-Off and Mooring Systems on Energy Capture. Journal of Offshore Mechanics and Arctic Engineering. volum 135 (3).
Academic article
Dong, Wenbin; Moan, Torgeir; Gao, Zhen. (2012) Fatigue Reliability Analysis of the Jacket Support Structure for Offshore Wind Turbine Considering the Effect of Corrosion and Inspection. Reliability Engineering & System Safety. volum 106.
Academic article
Dong, Wenbin; Moan, Torgeir; Gao, Zhen. (2011) Long-term Fatigue Analysis of Multi-Planar Tubular Joints for Jacket-type Offshore Wind Turbine in Time Domain. Engineering structures. volum 33 (6).
Academic article

Report

Gao, Zhen. (2008) Stochastic Response Analysis of Mooring Systems with Emphasis on Frequency-domain Analysis of Fatigue due to Wide-band Response Processes. 2008. ISBN 9788247159835. Doktoravhandlinger ved NTNU (2008:11).
Doctoral dissertation

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