Session: 09-01-10: Offshore Wind Energy - Data science and Digital twins

Paper Number: 105074

105074 - Time Domain Structural Analysis and Digital Twin Application for Floating Offshore Wind Turbine 

Abstract

Over the past five years, Technip Energies has studied and validated a response-based time domain structural analysis method for offshore floating platforms. Compared to the conventional method which is load-based and simplified, this innovative method can evaluate structural strength and fatigue assessments with higher accuracy, taking into account irregular waves, nonlinear environmental loadings, phasing between different loads/platform motions, nonlinear motion responses, and nonlinear mooring and riser loadings.

The present study examines the structural assessment of both the turbine tower connection and the entire substructure of a Floating Offshore Wind Turbine (FOWT) using a response-based time domain structural analysis. As a preprocessing step, Finite Element (FE) models are constructed for the entire FOWT, and corresponding load components are mapped to the FE model. A fully coupled aero-hydro-servo-elastic FOWT in-house analysis software, MLTSIM-OpenFAST, is used to calculate dynamic responses of a FOWT in time domain. MLTSIM-OpenFAST has been validated through OC3 DeepCwind model tests [5][6] and used for the life cycle response analysis of a FOWT with 25 years weather data [7].

Based on these results, all load components are synthesized at every instantaneous time step and are converted to response-based stresses. This methodology efficiently and more accurately determines the stress distribution for different load cases which is useful for both new design and digital twin application to provide quick structural strength results and fatigue damage. 

 

References

[1] Kyoung, J., Samaria, S., Kim, J.W. and Duffy, B.J., 2019, “Response Based Time Domain Structural Analysis on Floating Offshore Platform”, OMAE2019-96139

[2] Kyoung, J., Samaria, S. and Kim, J.W., 2020, “Time Domain Structural Fatigue Analysis on Floating Offshore Platforms: A Response Based Technique”, OMAE2020-18314

[3] Kyoung, J., Samaria, S., O’Donnell, J. and Tallavajhula, T., 2021, “Advances in Offshore Structural Analysis Using Response-based Time-domain Approach”, OTC-31280-MS

[4] O’Donnell, J., Kyoung, J., Samaria, S. and Sablok, A., 2021, “Engineering Criticality Assessments of Floating Offshore Platforms Based on Time Domain Structural Response Analysis”, OMAE2021-63796

[5] Koo, B., Goupee, A.J., Lambrakos, K. and Lim, H.-J., 2013, “Model Test Correlation Study for a Floating Wind Turbine on a Tension Leg Platform”, OMAE2013-1590 

[6] Koo, B., Goupee, A.J., Lambrakos, K. and Lim, H.-J., 2014, “Model Test Data Correlations with Fully Coupled Hull/Mooring Analysis for a Floating Wind Turbine on a Semi-Submersible Platform”, OMAE2014-24254 

[7] Koo, B., Kim, H., Lim, H.-J., Lai, L., Jang, H. and Jeong, C., 2022, “Life Cycle Response Analysis of a Floating Offshore Wind Turbine”, OMAE2022-8011

 

Presenting Author: Anil Sablok Technip Energies

Presenting Author Biography: Anil Sablok is Chief Engineer in the FAST division of the Technology and Innovation team in Technip Energies in Houston with over 32 years of industrial experience in the development and design of hull, mooring, and risers systems. He has been involved with the design, fabrication, and installation of fixed and floating offshore platforms. During his tenure at Deep Oil Technology, he was involved with the development of Spars. He has been the Chief Engineer on majority of the Spar projects operating around the world. Lately, he is extensively involved with research, development, and design of floating offshore platforms and mooring including floating wind platforms and unattended oil and gas platforms. He has an undergraduate degree in Naval Architecture and a graduate degree in Ocean Engineering.

Authors:

Ho-Joon Lim Technip Energies
Sagar Samaria Technip Energies
Sukjoo Choi Technip Energies, Genesis
Anil Sablok Technip Energies
Hakun Jang Technip Energies
Bonjun Koo Technip Energies