Project Details
Projekt
A combined numerical-experimental approach for the damping evaluation of nonlinear dissipative vibration systems
Subject Area
Mechanics
Term
from 2016 to 2021
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 314959828
The dynamics of mechanical structures is essentially affected by the amount of damping, which may be of very different physical nature. Beside material damping these are e.g. in frictional joints such as bolts and flanges, particle dampers, piezo damping and much more. However, the accurate prediction of the damping values still is an open issue. Hence, in this project, a methodology will be developed that is based on the investigation of simple nonlinear surrogate models, resulting from appropriate model reduction techniques. Different nonlinear damping principles may be represented by so-called nonlinear energy sinks (NES) that are attached locally to the host structure. Special attention is paid on the solution of the obtained nonlinear surrogate models, applying procedures like continuation methods, bifurcation analysis, alternating frequency-time-methods, multiharmonic approaches and stability analysis. As a main outcome, the results will give insight in the efficiency and, in particular, the robustness of nonlinear damping devices, in order to evaluate their applicability to structures with uncertain parameters and varying operating conditions. The numerical studies will be accompanied by experiments to validate the methodology.
DFG Programme
Priority Programmes
