# Cristian Guillermo Gebhardt

Professor, Director Bergen Offshore Wind Centre (BOW)

- E-mailcristian.gebhardt@uib.no
- Phone+47 55 58 26 23
- Visitor AddressAllégaten 705007 Bergen
- Postal AddressPostboks 78035020 Bergen

- C. Gebhardt, J. Schubert, M. Steinbach. Long-time principal geodesic analysis in director-based dynamics of hybrid mechanical systems. Communications in Nonlinear Science and Numerical Simulation 122:107240, 2023.
- R. Ausas, C. Gebhardt, G. Buscaglia. A finite element method for simulating soft active non-shearable rods immersed in generalized Newtonian fluids. Communications in Nonlinear Science and Numerical Simulation 108:106213, 2022.
- R. Berger, G. Quaak, B. Hofmeiser, C. Gebhardt, R. Rolfes. A multi-objective approach towards optimized patch repairs of blisk blades. AIAA Journal 60:1199-1220, 2022.
- C. Gebhardt, I. Romero. On a nonlinear rod exhibiting only axial and bending deformations: mathematical modeling and numerical implementation. Acta Mechanica 232:3825-3847, 2021.
- C. Hente, C. Gebhardt, R. Rolfes. On the static analysis of nonlinear beam and shell structures with singular stiffness matrices due to redundant coordinates. Thin-Walled Structures 161:107496, 2021.
- C. Gebhardt, M. Steinbach, D. Schillinger, R. Rolfes. A framework for data-driven structural analysis in general elasticity based on nonlinear optimization: the dynamic case. International Journal for Numerical Methods in Engineering 121:5447–5468, 2020.
- C. Gebhardt, I. Romero. The rotating rigid body model based on a non-twisting frame. Journal of Nonlinear Science 30:3199–3233, 2020.
- R. Berger, B. Hofmeiser, C. Gebhardt, R. Rolfes. A two-objective design optimisation approach for blending repairs of damaged compressor blisks. Aerospace Science and Technology 105:106022, 2020.
- C. Gebhardt, D. Schillinger, M. Steinbach, R. Rolfes. A framework for data-driven structural analysis in general elasticity based on nonlinear optimization: the static case. Computer Methods in Applied Mechanics and Engineering 365:112993, 2020.
- M. Henkel, J. Häfele, W. Weijtjiens, C. Devriendt, C. Gebhardt, R. Rolfes. Strain estimation for offshore wind turbines with jacket substructures using dual-band modal expansion. Marine Structures 71:102731, 2020.
- I. Romero, C. Gebhardt. Variational principles for nonlinear Kirchhoff rods. Acta Mechanica 231:625–647, 2020.
- C. Gebhardt, I. Romero, R. Rolfes. A new conservative/dissipative time integration scheme for nonlinear mechanical systems. Computational Mechanics 65:405–427, 2020.
- C. Hübler, J.-H. Piel, C. Stetter, C. Gebhardt, M. Breitner, R. Rolfes. The effect of structural designs on the economic viability of offshore wind turbines: an interdisciplinary analysis. Renewable Energy 145:1348–1360, 2020.
- C. Hente, C. Gebhardt, D. Pache, R. Rolfes. On the modal analysis of nonlinear beam and shell structures with singular mass and stiffness matrices. Thin-Walled Structures 144:106310, 2019.
- C. Gebhardt, M. Steinbach, R. Rolfes. Understanding the nonlinear dynamics of beam structures: a principal geodesic analysis approach. Thin-Walled Structures 140:357–372, 2019.
- C. Hübler, W. Weijtjiens, C. Gebhardt, R. Rolfes, C. Devriendt. Validation of improved sampling concepts for offshore wind turbine fatigue design. Energies 12:603, 2019.
- J. Häfele, C. Gebhardt, R. Rolfes. A comparison study on jacket substructures for offshore wind turbines based on optimization. Wind Energy Science 4:23–40, 2019.
- C. Gebhardt, B. Hofmeister, C. Hente, R. Rolfes. Nonlinear dynamics of slender structures: a new object-oriented framework. Computational Mechanics 63:219-252, 2019.
- K. Schröder, S. Groove, S. Tsiapoki, C. Gebhardt, R. Rolfes. Structural change identification using model updating at a wind turbine blade. Journal of Physics: Conference Series 1104:012030, 2018.
- C. Hübler, C. Gebhardt, R. Rolfes. Assessment of the state-of-the-art ULS design procedure for offshore wind turbine sub-structures. Journal of Physics: Conference Series 1104:012013, 2018.
- C. Hübler, C. Gebhardt, R. Rolfes. Methodologies for fatigue assessment of offshore wind turbines considering scattering environmental conditions and the uncertainty due to finite sampling. Wind Energy 21:1092–1105, 2018.
- J. Häfele, R. Damiani, R. King, C. Gebhardt, R. Rolfes. A systematic approach to offshore wind turbine jacket predesign and optimization: geometry, cost, and surrogate structural code check models. Wind Energy Science 3:553–572, 2018.
- C. Gebhardt, A. Matusevich, J. Inaudi. Coupled transverse and axial vibrations including warping effect in asymmetric short beams. Journal of Engineering Mechanics 144:04018043, 2018.
- K. Schröder, C. Gebhardt, R. Rolfes. A two-step approach to damage localization at supporting structures of offshore wind turbines. Structural Health Monitoring 17:1313–1330, 2018.
- J. Häfele, C. Hübler, C. Gebhardt, R. Rolfes. A comprehensive fatigue load set reduction study for offshore wind turbines with jacket substructures. Renewable Energy 118:99–112, 2018.
- A. Albanesi, F. Bre, V. Fachinotti, C. Gebhardt. Simultaneous ply-order, ply-number and ply-drop optimization of laminate wind turbine blades using the inverse finite element method. Composite Structures 184:894–903, 2018.
- C. Hübler, J. Häfele, C. Gebhardt, R. Rolfes. Experimentally supported consideration of operating point dependent soil properties in coupled dynamics of offshore wind turbines. Marine Structures 57:18–37, 2018.
- C. Hübler, C. Gebhardt, R. Rolfes. Development of a comprehensive data basis of scattering environmental conditions and simulation constraints for offshore wind turbines. Wind Energy Science 2:491–505, 2017.
- S. Brandt, M. Broggi, J. Häfele, C. Gebhardt, R. Rolfes, M. Beer. Meta-models for fatigue damage estimation of offshore wind turbines. Procedia Engineering 119:1158–1163, 2017.
- C. Gebhardt, R. Rolfes. On the nonlinear dynamics of shell structures: combining a mixed finite element formulation and a robust integration scheme. Thin-Walled Structures 118:56–72, 2017.
- C. Hübler, C. Gebhardt, R. Rolfes. Hierarchical four-step global sensitivity analysis of offshore wind turbines based on aeroelastic time-domain simulations. Renewable Energy 111:878–891, 2017.
- A. Albanesi, V. Fachinotti, I. Peralta, B. Storti, C. Gebhardt. Application of the inverse finite element method to design wind turbine blades. Composite Structures 161:160–172, 2017.
- J. Häfele, C. Hübler, C. Gebhardt, R. Rolfes. An improved two-step soil-structure interaction modeling method for dynamical analyses of offshore wind turbines. Applied Ocean Research 55:141–150, 2016.
- C. Gebhardt, B. Roccia. Non-linear aeroelasticity: an approach to compute the response of three-blade large-scale horizontal-axis wind turbines. Renewable Energy 66:495–514, 2014.
- B. Roccia, S. Preidikman, C. Gebhardt, J. Massa. Dynamics of micro-air-vehicles with flapping wings: a multibody system approach. IEEE Latin American Transactions 11:189–195, 2013.
- C. Gebhardt, S. Preidkman, M. Jørgensen, J. Massa. Non-linear aeroelastic behavior of large horizontal-axis wind turbines: a multibody system approach. International Journal of Hydrogen Energy 37:14719–14724, 2012.
- C. Gebhardt, S. Preidikman, J. Massa. Numerical simulations of the aerodynamic behavior of large horizontal-axis wind turbines. International Journal of Hydrogen Energy 35:6005–6011, 2010.

Academic article

- (2022). A finite element method for simulating soft active non-shearable rods immersed in generalized Newtonian fluids. Communications in nonlinear science & numerical simulation.

- (2021). On the static analysis of nonlinear beam and shell structures with singular stiffness matrices due to redundant coordinates. Thin-walled structures. 16 pages.
- (2021). On a nonlinear rod exhibiting only axial and bending deformations: mathematical modeling and numerical implementation. Acta Mechanica. 3825-3847.

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