structural dynamics
The focus lies on the experimental and numerical investigation of vibrating structures with joints. Here, energy dissipation by microslip effects in the joints is the major source of damping, which is the main quantity of interest. However,the joints are local nonlinearities, which make the application of classical linear modal analysis prohibitive and nonlinear methods have to be used.
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Funding source: DFG / Schwerpunktprogramm (SPP)
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Lightweight design is one of the most important issues in engineering design. The objective is to reduce the mass of structural components for the purpose of saving costs, energy and resources in manufacturing and operation processes. However, the lighter the structure is, the more it is prone to unwanted vibrations. Such vibrations should be minimized in order to prevent the environment, products and human beings from being harmed and to maximize the lifetime of the products.Vibration reduction…
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Rotating systems are subject to gyroscopic effects, which influence the structure’s dynamics. The Arbitrary-Lagrangian-Eulerian formulation in the finite element method offers an efficient way to include translational and rotatory guiding movement in the model in the course of decoupling this motion from the FE mesh. At the same time this approach aggravates the computation of frictional contact of the rotating body with other still-standing structures.
This procedure stems from the…
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In this project nonlinear oscillating systems are investigated. The nonlinearity is caused by the effect of large deformations (geometrical nonlinearity) or by physical effects, like friction. A designated target is after a nonlinear modal analysis (for example on the basis of NNMs) a model reduction on the isolated nonlinear mode. Limitations for this approach are given by the nonlinear modal analysis.
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Publications:
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Adaptive harmonic balance analysis of dry friction damped systems
34th IMAC, A Conference and Exposition on Structural Dynamics, 2016
DOI: 10.1007/978-3-319-29739-2_36 - , , :
Calculating the Dynamic Response of Jointed Structures in the Frequency Domain Using Contact Interface Elements
In: Matthew R.W. Brake (ed.): The Mechanics of Jointed Structures, Cham: Springer, 2018, p. 491-510
ISBN: 978-3-319-56818-8
DOI: 10.1007/978-3-319-56818-8_27 - , :
Model reduction of gyroscopic systems in ALE formulation with and without non-linearities
GAMM 2018 (München, 19. March 2018 - 23. March 2018)
In: PAMM, Volume 18, Weinheim: 2018
DOI: 10.1002/pamm.201800216 - , :
Numerical and experimental modal analysis of structures under gyroscopic influence in ALE formulation
ISMA2018 (Leuven, Belgien, 17. September 2018 - 19. September 2018) - , :
Reduced Order Modelling for Non-Linear Rotating Systems in ALE Formulation with Contact
IMAC 2018 (Orlando, FL, USA, 12. February 2018 - 15. February 2018)
In: Gaetan Kerschen (ed.): Nonlinear Dynamics, Volume 1; Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018 2018
DOI: 10.1007/978-3-319-74280-9_31