Dr. Felix Weber Profile

Dr. Felix Weber

at Swiss Federal Labs for MTR

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Proceedings Article | 5 August 2003 Paper

Theoretical comparison of different controlled damping devices for cable vibration mitigation

Felix Weber, Glauco Feltrin

Proceedings Volume 5056, (2003) https://doi.org/10.1117/12.483389

KEYWORDS: Actuators, Feedback control, Device simulation, Model-based design, Data modeling, Bridges, Matrices, Structural engineering, Analytical research, Vibration simulation

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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.

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