Dr. Tom Lahmer

Research Fields

• Theory an Numerics of Inverse and Ill-posed Problems
• Optimization, Quanitification of Uncertainties
• Design of Experiments for Ill-Posed Problems
• Sensitivity Analyses
• Multifield Problems in Sensor Applications and Civil Engineering

Projects:

• DFG:  T. Rabczuk, T. Lahmer: Eine elektro-mechanische XFEM Formulierung für Vorwärtsprobleme und inverse Probleme  (2011-2014)
• BMW Group: C. Könke, V. Zabel, T. Lahmer: Bestimmung der Fügestellendämpfung in Abhängigkeit externer Randbedingungen, seit 2010

Publications (with Review):

• K. Gürlebeck, T. Lahmer, F. Werner (Editors):19th International Conference on the Application of Computer Science and Mathematics in Architecture and Civil Engineering, ISSN 1611-4086, Weimar 2012
• H. Nguyen-Vinh, I. Bakar, M.A. Msekh, J.-H. Song, J. Muthu, G. Zi, P. Le, S. Bordas, R. Simpson, S. Natararajan, T. Lahmer, T. Rabczuk, Extended Finite Element Method for Dynamic Fracture of Piezo-Electric Materials, Engineering Fracture Mechanics, In Press, Accepted Manuscript, Available online 27 April 2012
• T. Lahmer, Optimal experimental design for nonlinear ill-posed problems applied to gravity dams, Journal of Inverse Problems, Vo.l 27, No. 12, 2011.
• H. Keitel, G. Karaki, T. Lahmer, S. Nikulla, V. Zabel, Evaluation of coupled partial models in structural engineering using graph theory and sensitivity analyses, Engineering Structures, Vol. 33, pages 3726-3736, 2011.
• T. Lahmer, Konzepte der optimalen Versuchsplanung für das Monitoring von Bauwerken, Allgemeine Vermessungs-Nachrichten, 3/2011, Wichmann-Verlag.
• T. Lahmer, C. Könke, V. Bettzieche, Optimale Positionierung von Messeinrichtungen an Staumauern zur Bauwerksüberwachung, Wasserwirtschaft, 2010.
• T. Knabe, M. Datcheva, T. Lahmer, F. Cotecchia, T. Schanz, Identification of constitutive parameters of soil using an optimization strategy and statistical analysis, Computers and Geotechniques, in review 2011.
• T. Lahmer, Crack identification in hydro-mechanical systems with applications to gravity water dams, Journal of Inverse Problems in Science and Engineering, Volume 18, Issue 8, 2010, Pages 1083 - 1101.
• T. Lahmer, Modified Landweber iterations in a multilevel algorithm applied to inverse problems in piezoelectricity.  Journal of Inverse and Ill-Posed Problems, Volume 17, Issue 1,  2009.
• A. Hauck, T. Lahmer, M. Kaltenbacher, Enhanced homogenization technique for magnetomechanical systems using the generalized finite element method.  Computational and analytical methods in electrical and electronic engineering, Vol. 28, No. 4, pp. 935-947, 2009.
• T. Lahmer, Forward and Inverse Problems in Piezoelectricity, Dissertation, Friedrich-Alexander Universität Erlangen-Nürnberg
• T. Lahmer, M. Kaltenbacher, B. Kaltenbacher, E. Leder and R. Lerch. FEM-Based Determination of Real and Complex Elastic, Dielectric and Piezoelectric Moduli in Piezoceramic Materials. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 55(2):465-475, 2008.
• T. Lahmer, B. Kaltenbacher and V. Schulz. Optimal measurement selection for piezoelectric material tensor identification. Journal of Inverse Problems in Science and Engineering, 16:369-387, 2008.
• B. Kaltenbacher, T. Lahmer, M. Mohr, and M. Kaltenbacher. PDE based determination of piezoelectric material tensors. European Journal of Applied Mathematics, 17:383-416, 2006.

Proceedings:

• P. Stein, T. Lahmer, S. Bock, Synthese und Analyse von gekoppelten Modellen im konstruktiven Ingenieurbau, Bautechnik, Sonderdruck 6, Juni 2011
• T. Lahmer, T. Knabe, S. Nikulla, M. Reuter, Bewertungsmethoden für Modelle des konstruktiven Ingenieurbaus, Bautechnik, Sonderdruck 6, Juni 2011
• T. Lahmer, C. Könke, V. Bettzieche, Optimale Positionierung von Messeinrichtungen an Staumauern zur Bauwerksüberwachung Messtechnische Überwachung von Stauanlagen, Beitrag zum VII. Mittweidaer Talsperrentag, 2010.
• T. Lahmer, Coupled HM-Field System Identification - Application to Water Reservoirs, EURO:TUN 2009, 2nd International Conference on Computational Methods in Tunnelling, Ruhr University Bochum, September 2009.
• T. Lahmer, Hydro-Mechanical Coupled Field System Identification - Application to Water Reservoirs, 18th International Conference on the Application of Computer Science and Mathematics in Architecture and Civil Engineering, K. Gürlebeck and C. Könke (eds.), Weimar, Germany, July 2009.
• T. Lahmer, C. Könke, T. Schanz, Coupled HM-Field System Identification - Application to water reservoirs, Int. Conf. on Computational Methods for Coupled Problems in Science and Engineering COUPLED PROBLEMS 2009, B. Schrefer, E. Onate and M. Papadrakakis (eds), CIMNE, Barcelona, 2009.
• F. Wolf, T. Lahmer, L. Bahr, A. Hauck, A. Sutor, M. Kaltenbacher, and R. Lerch. Finite Element Modeling of Ultrasonic Transducer by Utilizing an Inverse Scheme for the Determination of its Material Parameters . In Proceedings of the IEEE Ultrasonics Symposium, 2008.
• A. Hauck, T. Lahmer, and M. Kaltenbacher. Enhanced Homogenization Technique for Magnetomechanical Systems using the Generalized Finite Element Method. In Proceedings of the 13th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, 2008.
• A. Hauck, T. Lahmer, and M. Kaltenbacher. A Two Scale Approach using pFEM for the Homogenization of Power Transformer Windings. In Book of Abstracts of the 2nd GACM Colloquium on Computational Mechanics 2007, page 191, 2007. Munich, 10.-12.10.2007.
• T. Lahmer. Modified Landweber Iterations in a Multilevel Setting Applied to the Determination of Nonlinear Material Parameters in Piezoelectricity, Proc. Appl. Math. Mech, 2007.
• T. Lahmer and J. Schöberl. Homogenization Techniques in Sensor / Actuator Applications, Technical Report LSE-Report 04/06, Lehrstuhl für Sensorik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 2006.
• T. Lahmer, B. Kaltenbacher, and V. Schulz. Optimal Data Selection for Piezoelectric Material Characterization, Proc. Appl. Math. Mech, 2006.
• N. Bretz, T. Lahmer, M. Kaltenbacher, E. Leder, and R. Lerch. Material Parameters Identification of Piezoelectric Transducers including the whole Assembly. In Proceedings of the IEEE Ultrasonics Symposium, pages 804-807, 2006. Vancouver, Kanada, 03.-06.10.06.
• T. Lahmer, B. Kaltenbacher, and M. Mohr. Simulation Based Determination of Piezoelectric Material Parameters, Proc. Appl. Math. Mech, 5:59-62, 2005.