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Proceedings Paper

Theoretical comparison of different controlled damping devices for cable vibration mitigation
Author(s): Felix Weber; Glauco Feltrin
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Paper Abstract

The vibration mitigation performance of different feedback controlled damping devices for cable vibration mitigation is investigated. A model-based designed LQG controller estimates the vibration state based on a validated linear cable model. The main nonlinearity of the connected system damping device - cable is compensated by its inverse function. The simulated damping devices are actuator and controllable damper without any actuator/damper dynamics. It is assumed that further constraints such as minimum or maximum force limitations do not exist. The theoretical study compares the potential of vibration mitigation using a feedback controlled actuator and a feedback controlled damper. The comparative study is simulated for two positions of the damping device. One is near the anchorage, which is the only possible position on a real cable-stayed bridge. The other position is characterized by the largest cable displacement within the frequency range of the first four modes. In order to guarantee a fair comparison, the optimal controller parameters are determined for the active controlled actuator and semi-active controlled damper for both positions. The simulation results demonstrate, first, that active controlled actuators can hardly mitigate vibrations more effectively than semi-active controlled dampers because vibration energy must be dissipated. Second, the position of the damping device shows a negligible influence on the mitigation performance because smaller displacements and therefore smaller velocities near the anchorage are compensated by larger actuator/damper forces.

Paper Details

Date Published: 5 August 2003
PDF: 12 pages
Proc. SPIE 5056, Smart Structures and Materials 2003: Smart Structures and Integrated Systems, (5 August 2003); doi: 10.1117/12.483389
Show Author Affiliations
Felix Weber, Swiss Federal Labs. for Materials Testing and Research (Switzerland)
Glauco Feltrin, Swiss Federal Labs. for Materials Testing and Research (Switzerland)


Published in SPIE Proceedings Vol. 5056:
Smart Structures and Materials 2003: Smart Structures and Integrated Systems
Amr M. Baz, Editor(s)

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