Institute for Technical Mechanics, Johannes Kepler University (JKU), Linz, Austria PhD Thesis: Development of shear and cross section deformable beam finite elements applied to large deformation and dynamics problems Rigorosum passed with distinction in December 2012
2006 - 2009
Diploma Degree in Industrial Mathematics Research Institute for Symbolic Computation (RISC), JKU, Linz, Austria Diploma Thesis: Power Series Solutions to Holonomic Differential Equations and the General Algebraic Equation
2003 - 2006
Bachelor Degree in Technical Mathematics Johann Radon Institute for Computational and Applied Mathematics (RICAM), JKU, Linz, Austria, Bachelor Thesis: Linear Complexity of Sidelnikov Sequences
Current Academic Appointments
09/2015 - now
Professorship for Applied Mathematics at the University of Applied Sciences, Upper Austria, Campus for Engineering, Wels
01/2015 - now
Research Associate and Head of Project “DynaCon: The Embedding of the Adjoint Method in Multibody Dynamics” in the R&D University of Applied Sciences Upper Austria, Research Center Wels, funded by FWF Austrian Science Fund, Project No. T733-N30
Selected Awards
2020, “Best Paper Award” for the 16th edition of the “Multibody Systems and Nonlinear Dynamics and Controls” Conference in the area of Nonlinear Dynamics: Best Paper Award: IDETC2020-22034 – “The Adjoint Gradient Method for Time-Optimal Control of a Moon Landing - Ascent, Descent, and Abort” by Philipp Eichmeir, Karin Nachbagauer (University of Applied Sciences Upper Austria, Austria), Wolfgang Steiner (Technical University of Vienna), July 2020
2019, Price for „Excellence in Teaching", price was awarded by the president of the University of Applied Sciences Upper Austria. The award recognizes excellence in teaching, linking research and teaching and supervision of theses, December 2019
2013, Talent Promotion Award of the Province of Upper Austria in the category Science, initiated and awarded by Governor Dr. Josef Pühringer, November 2013
2013, Upper Austrian Women Researcher Award 2013 in the category Special Prize Young Researcher for the project "Dynamic Response of Nonlinear Problems with Large Rotations", initiated by the State Councilor for Research, Mag.a Doris Hummer, and the Upper Austrian Research GmbH, June 2013
2012, Nominated for the final for the ECCOMAS PhD-Award 2012 by the Central European Association for Computational Mechanics (CEACM), September 2013
2011, “Best Paper Award for outstanding level of academic achievements and scientific content” awarded by the Université Catholique de Louvain, Brüssel, Belgien, Juli 2011
Research Interests
Multibody System Dynamics, Numerical Mathematics, Inverse Dynamics, Computer-aided simulation, Optimal Control
Selected Publications
K. Nachbagauer, A.S. Pechstein, H. Irschik, J. Gerstmayr. A new locking-free formulation for planar, shear deformable, linear and quadratic beam finite elements based on the absolute nodal coordinate formulation. Journal of Multibody System Dynamics, Vol. 26, Nr. 3, pp. 245-263, doi: 10.1007/s11044-011-9249-8, Open Access, 2011.
K. Nachbagauer, P. Gruber, J. Gerstmayr. Structural and Continuum Mechanics Approaches for a 3D Shear Deformable ANCF Beam Finite Element: Application to static and linearized dynamic examples. Journal for Computational and Nonlinear Dynamics, Vol. 8, 021004, doi: 10.1115/1.4006787 (7 pages), 2012.
K. Nachbagauer, J. Gerstmayr. Structural and Continuum Mechanics Approaches for a 3D Shear Deformable ANCF Beam Finite Element: Application to Buckling and Nonlinear Dynamic Examples. Journal for Computational and Nonlinear Dynamics, Vol. 9, Nr. 1, 011013 (8 pages), doi: 10.1115/1.4025282, 2013.
K. Nachbagauer. State of the Art of ANCF Elements Regarding Geometric Description, Interpolation Strategies, Definition of Elastic Forces, Validation and the Locking Phenomenon in Comparison with Proposed Beam Finite Elements. Archives of Computational Methods in Engineering, Vol. 21, Issue 3, pp. 293-319, doi: 10.1007/s11831-014-9117-9 (27 pages), 2014.
K. Nachbagauer, S. Oberpeilsteiner, K. Sherif, W. Steiner. The Use of the Adjoint Method for Solving Typical Optimization Problems in Multibody Dynamics. Journal for Computational and Nonlinear Dynamics, Vol. 10, doi:10.1115/1.4028417, Paper Nr. 061011, (10 pages), 2015.
T. Lauß, S. Oberpeilsteiner, W. Steiner, K. Nachbagauer. The Discrete Adjoint Gradient Computation for Optimization Problems in Multibody Dynamics, Journal of Computational and Nonlinear Dynamics, Vol. 12, No. 3, 2016.
T. Lauss, S. Oberpeilsteiner, W. Steiner, K. Nachbagauer. The Discrete Adjoint Method for Parameter Identification in Multibody System Dynamics, Journal for Multibody System Dynamics, Vol. 42, DOI: doi.org/10.1007/s11044-017-9600-9, pp. 397-410, 2017.
H. Wimmer, K. Nachbagauer. Exact Transfer- and Stiffness Matrix for the Composite Beam-column with Refined Zigzag Kinematics, Journal for Composite Structures, Vol. 189, DOI: 10.1016/j.compstruct.2018.01.022, pp. 700-706, 2018.
K. Sherif, K. Nachbagauer, W. Steiner, T. Lauß. A Modified Newmark Method for the Numerical Simulation of Rigid Body Rotations with Euler Parameters, Journal for Multibody System Dynamics, doi: 10.1007/s11044-019-09672-6, pp. 1-22, 2019.
H. Wimmer, W. Hochhauser, K. Nachbagauer. Refined Zigzag Theory - An appropriate tool for the analysis of CLT-plates and other shear-elastic timber structures, European Journal of Wood and Wood Products, doi.org/10.1007/s00107-020-01586-x, pp. 1-11, 2020.
D. Lichtenecker, K. Nachbagauer: Optimal Control of Soft Robotic Fingers,. Proceedings of the 26th International Congress of Theoretical and Applied Mechanics, , 2024 mehr…BibTeX
D. Lichtenecker, W.T. Yang, K. Nachbagauer, M. Tomizuka: Synchronization of Soft Pneumatic Actuators for Reliable Grasping. Proceedings of the Seventh International Conference on Multibody System Dynamics - IMSD 2024, 2024 mehr…BibTeX
Lichtenecker, Daniel; Eichmeir, Philipp; Nachbagauer, Karin: On the Usage of Analytically Computed Adjoint Gradients in a Direct Optimization for Time-Optimal Control Problems. In: Optimal Design and Control of Multibody Systems. Springer Nature Switzerland, 2024 mehr…BibTeX
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Lichtenecker, Daniel; Nachbagauer, Karin: A discrete adjoint gradient approach for equality and inequality constraints in dynamics. Multibody System Dynamics, 2024 mehr…BibTeX
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2023
D. Lichtenecker, K. Nachbagauer: Structural optimization of flexible components of multibody systems in optimal control. Proceedings of the ASME 2023, International Design Engineering Technical Conferences and Computers and Information in Engineering Conference IDETC/CIE2023, 2023 mehr…BibTeX
Lichtenecker, D.; Nachbagauer, K.: Combined Optimal Control and Design of Flexible Multibody Systems. Book of Abstracts of the 11th ECCOMAS Thematic Conference on MULTIBODY DYNAMICS, Instituto Superior Técnico, University of Lisbon, 2023 mehr…BibTeX
Lichtenecker, Daniel; Rixen, Daniel; Eichmeir, Philipp; Nachbagauer, Karin: On the use of adjoint gradients for time-optimal control problems regarding a discrete control parameterization. Multibody System Dynamics 59 (3), 2023, 313-334 mehr…BibTeX
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Schubert, Matthias; Sato Martín de Almagro, Rodrigo T.; Nachbagauer, Karin; Ober-Blöbaum, Sina; Leyendecker, Sigrid: Discrete adjoint method for variational integration of constrained ODEs and its application to optimal control of geometrically exact beam dynamics. Multibody System Dynamics, 2023 mehr…BibTeX
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2022
Schubert, Matthias; Sato Martin de Almagro, Rodrigo T.; Nachbagauer, Karin; Leyendecker, Sigrid: Discrete Adjoint Method for Variational Integration of Constrained ODEs and Optimal Control of Geometrically Exact Beam Dynamics. Multibody System Dynamics, 2022 mehr…BibTeX
2021
Eichmeir, Philipp; Nachbagauer, Karin; Lauß, Thomas; Sherif, Karim; Steiner, Wolfgang: Time-Optimal Control of Dynamic Systems Regarding Final Constraints. Journal of Computational and Nonlinear Dynamics 16 (3), 2021 mehr…BibTeX
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Lichtenecker, Daniel; Eichmeir, Philipp; Nachbagauer, Karin: On the Role of Adjoint Gradients in Time-Optimal Control Problems under Final Constraints. , 2021 mehr…BibTeX
2020
Eichmeir, Philipp; Lauß, Thomas; Oberpeilsteiner, Stefan; Nachbagauer, Karin; Steiner, Wolfgang: The Adjoint Method for Time-Optimal Control Problems. Journal of Computational and Nonlinear Dynamics 16 (2), 2020 mehr…BibTeX
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