This thesis deals with the multiphysics problem of wind-structure interaction of civil engineering structures, including vibration mitigation systems, to reduce wind-induced vibrations. The work is subdivided into two major parts.
The first part presents the solution of the general fluid-structure-control interaction problem by an iterative, partitioned approach, utilizing Gauss-Seidel formulations. Therefore, the fluid-structure interaction (FSI) problem is extended by a control unit, which is actively influencing the dynamics of the structure. The behavior and sensitivity of the fluid-structure-control interaction problem are investigated by a simplified model problem. Based on this simplified model problem, three different algorithmic variants for the coupling of fluid flow, structure, and controller in a partitioned way by a Gauss-Seidel scheme are derived. Finally, the resulting algorithms are applied to a complex, non-linear, multi-degree of freedom problem. This benchmark problem is well-tested for FSI and is thus extended to fluid-structure-control interaction. It is demonstrated, that the flow-induced structural vibrations can be reduced significantly by actively influencing the structure's dynamics with a controller.
In the second part, the newly developed methods and general findings from the first part are applied to high-rise, tower-like structures from civil engineering subjected to wind. Those structures are a television tower and an elevator test tower. To further validate the simulation environment, the results of fully coupled FSI simulations for the television tower are compared to on-site measurements. Finally, the findings from the numerical studies for the television tower, combined with the best variant of the algorithms presented in the first part of this work, are applied to the elevator test tower simulation. This tower is equipped with a hybrid mass damper, which is utilized to reduce wind-induced vibrations but can also be used to actively excite tower oscillations. Different configurations of the elevator test tower are modeled and investigated by the algorithms and concepts developed throughout this work.
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This thesis deals with the multiphysics problem of wind-structure interaction of civil engineering structures, including vibration mitigation systems, to reduce wind-induced vibrations. The work is subdivided into two major parts.
The first part presents the solution of the general fluid-structure-control interaction problem by an iterative, partitioned approach, utilizing Gauss-Seidel formulations. Therefore, the fluid-structure interaction (FSI) problem is extended by a control unit, which...
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