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.


Structural dynamics of rotating systems

Vibration reduction by energy transfer using shape adaption

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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Reduced order modelling of non-linear gyroscopic systems in ALE formulation with frictional contact

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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Investigation and reduction of nonlinear oscillation systems using modal approaches

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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