Optimal viscous dampers targeting multiple cable modes with FEM
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
This master thesis presents a study of the mitigation of rain-wind induced vibrations on horizontal cables using viscous dampers considering multiple modes. Software based on finite
elements is developed which finds the optimal damping coefficient. This software uses a graphical user interface to facilitate the damper design process. In addition to this, the
maximum vertical and rotational displacements have also been studied to observe the mitigation of the maximum amplitudes with increasing damper coefficient.
The model is based on already known research, and the results are verified by comparing with case studies. The program uses both the Logarithmic Decrement method and the Half-Power Bandwitdh method to obtain the damping ratios.
From this master thesis the following can be deduced:
-The optimal modal damping will give the lowest maximum amplitudes.
- The maximum vertical displacements may be interesting when considering alternative ways to optimize the damper coefficient and location.
-The angular change delta (Δ) above the damper, increases with increasing damping coefficient.
Place, publisher, year, edition, pages
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 392
Cable, optimal, damping, viscous, linear, damper, multiple modes, Half-Power Bandwitdh, Logarithmic Decrement, GUI, MATLAB
IdentifiersURN: urn:nbn:se:kth:diva-125339OAI: oai:DiVA.org:kth-125339DiVA: diva2:639646
Karoumi, RaidBattini, Jean-Marc