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Logo: ISD/Leibniz Universität Hannover
Logo Leibniz Universität Hannover
Logo: ISD/Leibniz Universität Hannover
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Dr.-Ing. Cristian Gebhardt

Head of the group "Coupled Dynamical Systems"

 

Appelstraße 9A

30167 Hannover

Raum 526

 

Tel.:      +49-511-762-2859

Fax:      +49-511-762-2236

 

E-Mail: c.gebhardtisd.uni-hannover.de

 

Consultation hours: by appointment

Teaching Activities

Supervision of student works:

  • Project (B.Sc.) & bachelor theses, seminar (M.Sc.) and master theses are welcome by arrangement.

Lecture:

Research Focus

  • Structural dynamics
  • Multibody systems
  • Unsteady aerodynamics
  • Fluid-structure interaction
  • Coupled dynamical systems
  • Optimization
  • Wind turbines

Research Projects

  • DFWind – German Research Facility for Wind Energy

Journal Papers

C. Hübler, J.-H. Piel, C. Stetter, C. G. Gebhardt, M. H. Breitner, R. Rolfes (2020): Influence of structural design variations on economic viability of offshore wind turbines: An interdisciplinary analysis, Renewable Energy, Volume 145, Pages 1348-1360
DOI: 10.1016/j.renene.2019.06.113

C. G. Gebhardt, B. Hofmeister, C. Hente, R. Rolfes (2019): Nonlinear dynamics of slender structures: a new object-oriented framework, Computational Mechanics (2019), Volume 63, Issue 2, pp 219–252
DOI: 10.1007/s00466-018-1592-7

C. G. Gebhardt, D. Schillinger, M. C. Steinbach, R. Rolfes (2019): A Framework for Data-Driven Computational Mechanics Based on Nonlinear Optimization
arXiv: 1910.12736

C. G. Gebhardt, M. C. Steinbach, R. Rolfes (2019): Understanding the nonlinear dynamics of beam structures: a principal geodesic analysis approach, Thin-Walled Structures, Volume 140, Pages 357-372
DOI: 10.1016/j.tws.2019.03.009

C. Hente, C. G. Gebhardt, D. Pache, R. Rolfes (2019): On the modal analysis of nonlinear beam and shell structures with singular mass and stiffness matrices, Thin-Walled Structures, Volume 144, 106310
DOI: 10.1016/j.tws.2019.106310

C. Hübler, W. Weijtjens, C. G. Gebhardt, R. Rolfes, C. Devriendt (2019): Validation of Improved Sampling Concepts for Offshore Wind Turbine Fatigue Design, Energies, Volume 12, Page 603
DOI: 10.3390/en12040603

C.G. Gebhardt, I. Romero, R. Rolfes (2019): A new conservative/dissipative time integration scheme for nonlinear mechanical systems, Comput Mech (2019)
DOI: 10.1007/s00466-019-01775-3

I. Romero, C. G. Gebhardt (2019): Variational principles for nonlinear Kirchhoff rods
arXiv: 1902.05726

J. Häfele, C. G. Gebhardt, R. Rolfes (2019): A comparison study on jacket substructures for offshore wind turbines based on optimization, Wind Energ. Sci., 4, 23–40
DOI: 10.5194/wes-4-23-2019

Alejandro Albanesi, Facundo Bre, Victor Fachinotti, Cristian Gebhardt (2018): Simultaneous ply-order, ply-number and ply-drop optimization of laminate wind turbine blades using the inverse finite element method, Composite Structures, Band: 184, Seite(n): 894-903
DOI: 10.1016/j.compstruct.2017.10.051

C. Hübler, C. G. Gebhardt, R. Rolfes (2018): Methodologies for fatigue assessment of offshore wind turbines considering scattering environmental conditions and the uncertainty due to finite sampling, Wind Energy, Volume 21, Pages 1092-1105
DOI: 10.1002/we.2216

C. Hübler, C. G. Gebhardt, R. Rolfes (2018): Assessment of a standard ULS design procedure for offshore wind turbine sub-structures, Journal of Physics: Confernece Series, Volume 1104, Pages 012013
DOI: 10.1088/1742-6596/1104/1/012013

Clemens Hübler, Jan Häfele, Cristian Guillermo Gebhardt, Raimund Rolfes (2018): Experimentally supported consideration of operating point dependent soil properties in coupled dynamics of offshore wind turbines, Marine Structures, Volume 57, Seite(n) 18-37
DOI: 10.1016/j.marstruc.2017.09.002

Cristian Gebhardt, Ariel E. Matusevich, José A. Inaudi (2018): Coupled Transverse and Axial Vibrations Including Warping Effect in Asymmetric Short Beams, Journal of Engineering Mechanics, Vol. 144, Issue 6
DOI: 10.1061/(ASCE)EM.1943-7889.0001471

Häfele, J., Damiani, R., King, R., Gebhardt, C. G., and Rolfes, R. (2018): A Systematic Approach to Offshore Wind Turbine Jacket Pre-Design and Optimization: Geometry, Cost, and Surrogate Structural Code Check Models, Wind Energ. Sci., 3, 553-572
DOI: doi.org/10.5194/wes-3-553-2018

Jan Häfele, Clemens Hübler, Cristian Guillermo Gebhardt, Raimund Rolfes (2018): A comprehensive fatigue load set reduction study for offshore wind turbines with jacket substructures, Renewable Energy, Volume 118, April 2018, Pages 99-112 more
DOI: 10.1016/j.renene.2017.10.097

K. Schröder, S. Groove, S. Tsiapoki, C. Gebhardt, R. Rolfes (2018): Structural change identication using model updating at a wind turbine blade, Journal of Physics: Conference Series, ISSN 1742-6588, 1104:012030
DOI: 10.1088/1742-6596/1104/1/012030

Karsten Schröder, Cristian Guillermo Gebhardt, Raimund Rolfes (2018): A two-step approach to damage localization at supporting structures of offshore wind turbines, Structural Health Monitoring
DOI: 10.1177/1475921717741083

Alejandro Albanesi, Victor Fachinotti, Ignacio Peralta, Bruno Storti, Cristian Gebhardt (2017): Application of the inverse finite element method to design wind turbine blades, Journal: Composite Structures, Band 161, Seite(n): 160-172
DOI: 10.1016/j.compstruct.2016.11.039

Clemens Hübler, Cristian Guillermo Gebhardt, Raimund Rolfes (2017): Hierarchical four-step global sensitivity analysis of offshore wind turbines based on aeroelastic time domain simulations, Renewable Energy, Band: 111. Seite(n): 878-891
DOI: 10.1016/j.renene.2017.05.013

Clemens Hübler, Cristian Guillermo Gebhardt, Raimund Rolfes (2017): Development of a comprehensive database of scattering environmental conditions and simulation constraints for offshore wind turbines, Wind Energy Science, Band: 2, Seite(n) 491-505
DOI: https://doi.org/10.5194/wes-2-491-2017

Cristian Guillermo Gebhardt, Raimund Rolfes  (2017): On the nonlinear dynamics of shell structures: Combining a mixed finite element formulation and a robust integration scheme, Thin-Walled Structures, Band 118, Seiten 56-72
DOI: 10.1016/j.tws.2017.05.001

Sebastian Brandt, Matteo Broggi, Jan Häfele, Cristian Guillermo Gebhardt, Raimund Rolfes, Michael Beer (2017): Meta-models for fatigue damage estimation of offshore wind turbines jacket substructures, Procedia Engineering, Band 199, Seite(n): 1158-1163
DOI: 10.1016/j.proeng.2017.09.292

Jan Häfele, Clemens Hübler, Cristian Guillermo Gebhardt, Raimund Rolfes (2016): An improved two-step soil-structure interaction modeling method for dynamical analyses of offshore wind turbines, Journal: Applied Ocean Research, Band: 55, Seite(n): 141-150
DOI: 10.1016/j.apor.2015.12.001

C. G. Gebhardt, B. A. Roccia (2014): Non-linear aeroelasticity: An approach to compute the response of three-blade large-scale horizontal-axis wind turbines, Journal: Renewable Energy, Band: 66, Seite(n): 495-514
DOI: 10.1016/j.renene.2013.12.040

B.A. Roccia, S. Preidikman, C.G. Gebhardt, J.C. Massa (2013): Dynamics of Micro-Air-Vehicles with Flapping Wings: A Multibody System Approach, Journal: Latin America Transactions, IEEE (Revista IEEE America Latina), Band: 11, Seite(n): 183-189
DOI: 10.1109/TLA.2013.6502800

C. G. Gebhardt, S. Preidikman, M. H. Jørgensen, J. C. Massa (2012): Non-linear aeroelastic behavior of large horizontal-axis wind turbines: A multibody system approach, Journal: International Journal of Hydrogen Energy, Band: 37, Seite(n): 14719-14724
DOI: 10.1016/j.ijhydene.2011.12.090

C. G. Gebhardt, S. Preidikman, J. C. Massa (2010): Numerical simulations of the aerodynamic behavior of large horizontal-axis wind turbines, Journal: International Journal of Hydrogen Energy, Band: 35, Reihe: 35, Seite(n): 6005-6011
DOI: 10.1016/j.ijhydene.2009.12.089

C. G. Gebhardt, S. Preidikman, J. C. Massa (2009): Características generales de la aerodinamica de generadores eólicos de eje horizontal y gran potencia, Journal: Avances en Energías Renovables y Medio Ambiente. Band: 13. Seite(n): 165-172 more

Proceedings

C. Hübler, C. G. Gebhardt, R. Rolfes (2019): Assessment of Sensitivity Analysis Methods of Different Complexity for Offshore Wind Turbines, 29th European Safety and Reliability Conference (ESREL), Hannover, Germany

D. Anastasio, J. Dietrich, J. Noël, G. Kerschen, S. Marchesiello, J. Häfele, C. Gebhardt, R. Rolfes (2019): Dynamics of Geometrically-nonlinear Beam Structures, Part 1: Numerical Modeling, 37th Conference and Exposition on Structural Dynamics (IMAC-XXXVII), Orlando, FL, USA

D. Anastasio, J. Dietrich, J. Noël, G. Kerschen, S. Marchesiello, J. Häfele, C. Gebhardt, R. Rolfes (2019): Dynamics of Geometrically-nonlinear Beam Structures, Part 2: Experimental Analysis, 37th Conference and Exposition on Structural Dynamics (IMAC-XXXVII), Orlando, FL, USA

Andreas Ehrmann, Cristian Guillermo Gebhardt, Raimund Rolfes (2018): Determination of Representative Offshore Wind Turbine Locations for Fatigue Load Monitoring by Means of Hierarchical Clustering, Extended Abstract in Proceedings of International Modal Analysis Conference (IMAC XXXVI), Orlando

Benedikt Hofmeister, Cristian Guillermo Gebhardt, Christian Hente, Raimund Rolfes (2018): Sparsity pattern extraction for assembly of KKT-like matrices in multibody dynamics

C. Hente, C. G. Gebhardt, B. Hofmeister, R. Rolfes (2018): On the modal analysis of flexible multibody systems with singular mass and stiffness matrices, Proceedings in Applied Mathematics and Mechanics, 89th GAMM Annual Meeting (2018)

Clemens Hübler, Franziska Müller, Cristian Guillermo Gebhardt, Raimund Rolfes  (2017): Global Sensitivity Analysis of Offshore Wind Turbine Substructures, Proceedings of the 15th International Probabilistic Workshop, pp 341-352, Dresden

Cristian Gebhardt, Raimund Rolfes (2017): Gesamtdynamik von Windenergieanlagen mit besonderer Berücksichtigung der Wind-Struktur-Interaktion, Baustatik-Baupraxis 13, Bochum

J. Häfele, C. Hübler, C. G. Gebhardt, R. Rolfes (2017): Reconsidering fatigue limit state load sets for jacket substructures utilizing probability distributions of environmental states, Proceeding of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference San Francisco, CA, USA, June 25-30, 2017
ISBN: 978-1-880653-97-5

Andreas Ehrmann, Nikolai Penner, Cristian Guillermo Gebhardt, Raimund Rolfes (2016): Offshore Support Structures with Suction Buckets: Parameter Fitting of a Simplified Foundation Model, Proceedings of the Twenty-sixth International Ocean and Polar Engineering Conference, Rhodes, pp 52-59

Karsten Schröder, Cristian G. Gebhardt and Raimund Rolfes (2016): Damage Localization at Wind Turbine Support Structures Using Sequential Quadratic Programming for Model Updating, Proceedings of the 8th European Workshop on Structural Health Monitoring (EWSHM), Bilbao, Spain

Chapter in Books

D. Anastasio, J. Dietrich, J.-P. Noël, G. Kerschen, S. Marchesiello, J. Häfele, C. G. Gebhardt, R. Rolfes (2020): Dynamics of Geometrically-Nonlinear Beam Structures, Part 1: Numerical Modeling, Nonlinear Structures and Systems, Volume 1 pp 213-216
DOI: 10.1007/978-3-030-12391-8_28

D. Anastasio, J. Dietrich, J.-P. Noël, G. Kerschen, S. Marchesiello, J. Häfele, C. G. Gebhardt, R. Rolfes (2020): Dynamics of Geometrically-Nonlinear Beam Structures, Part 2: Experimental Analysis, Nonlinear Structures and Systems, Volume 1 pp 217-220
DOI: doi:10.1007/978-3-030-12391-8_29

A. Ehrmann, C. G. Gebhardt, R. Rolfes (2018): Determination of Representative Offshore Wind Turbine Locations for Fatigue Load Monitoring by Means of Hierarchical Clustering, Rotating Machinery, Vibro-Acousitics & Laser Vibrometry., Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics, Volume 7, pp 149-152, Springer, Orlando
ISBN: 978-3-319-74693-7

Technical Reports

Häfele, J.; Gebhardt, C.G.; Rolfes, R. (2017): Innovative design of a hybrid-type jacket for 10MW turbines, Hannover

Presentations

C. Hübler, J.-H. Piel, C. Stetter, C. G. Gebhardt, M. H. Breitner, R. Rolfes (2018): Effects of the Support Structure Design on the Economic Viability of Offshore Wind Projects: an Interdisciplinary Analysis, Offshore Wind R&D Conference 2018 - Bremerhaven

J. Häfele, C. G. Gebhardt, R. Rolfes (2018): Optmization of jacket substructures considering detailed cost and load Assumptions, Offshore Wind R&D Conference 2018, Bremerhaven, Germany

Andreas Ehrmann, Cristian Guillermo Gebhardt, Raimund Rolfes  (2017): A Hierarchical Clustering Approach for Jacket Substructures for Offshore Wind Farms according to Location-Dependent Environmental Conditions, Wind Energy Science Conference, Lyngby

Andreas Ehrmann, Cristian Guillermo Gebhardt, Raimund Rolfes (2017): Hierarchical Clustering of Jacket Substructures for Offshore Wind Farms according to Location-Dependent Environmental Conditions, Wind Energy Systems Engineering Workshop, Roskilde

Clemens Hübler, Cristian Guillermo Gebhardt, Raimund Rolfes (2017): Development of a comprehensive data basis of scattering environmental conditions for offshore wind turbines, Wind Energy Science Conference, Kopenhagen, Dänemark

Cristian Guillermo Gebhardt, Clemens Hübler, Karsten Schröder, Raimund Rolfes (2017): Coupled dynamics of wind turbines: a multiple-perspective approach, IEA Wind Task 11, Topical Expert Meeting # 88, Edinburgh, Schottland

Jan Häfele, Clemens Hübler, Cristian G. Gebhardt, Raimund Rolfes (2017): An effective soil-structure interaction consideration approach for time domain simulations of offshore wind turbines, Präsentation, 7. GIGAWIND Symposium, Hannover

Background

  • 2018: Visiting professor at IMDEA materials institute, Madrid (Spain).
  • since 2015: Head of the group "Coupled Dynamical Systems" at Institute of Structural Analysis (Leibniz Universität Hannover).
  • 2012 2015: Research associate at Fraunhofer Institut for Wind Energy and Energy System Technology (Bremerhaven).
  • 2012: Dissertation: “Development of numerical simulations of the aeroelastic behavior of large-scale horizontal-axis wind turbines.”.
  • 2011 2012: Associate Professor at Universidad Nacional de Córdoba (Argentina).
  • 2010: Adjoint Professor at Universidad Nacional de Córdoba (Argentina).
  • 2010: Visiting doctoral fellow at Aarlborg Universitet (Denmark).
  • 2010: Visiting doctoral fellow at Århus Universitet (Denmark).
  • 2007 – 2012: Research associate at Universidad Nacional de Córdoba (Argentina) and CONICET.
  • 2006: Design engineer at the Department of Wind Turbines for  Industrias Metalúrgicas Pescarmona S.A..
  • 2005: Engineering Consultant at SIRVE (Argentina) for analysis of fluid-structure interaction in gravity dams using analytical and numerical approaches to validate simplified methods.
  • 2001 – 2005: Diploma degree in Mechanical and Aeronautical Engineering at Instituto Universitario Aeronáutico (Argentina).