Optimal Design for Robust Tuned Mass Dampers and the Performance under Excitation
| Autor: | Chang-Han Wu, 吳昌翰 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In recent years, tuned mass dampers have been widely used to control the vibrations. TMDs are often adopted in high-rise buildings, long-span bridges, and machines of high-tech factory to reduce the vibration and the discomfort. However, the values of TMD parameters determine the effectiveness. There are several design formulas for the structure without inherent damping, but in reality the structure has inherent damping. Therefore, it is necessary to use the iteration method to obtain the optimal design variables, and this study integrates two algorithms to find the best solution and optimal design variables rapidly and efficiently. Generally, the tuned mass damper design emphasizes the reducing effect rather than the robustness. However, TMD is sensitive to the frequency between the structure and the TMD. The reducing effect deteriorates if the frequency shift away from the optimal value. Therefore, this study proposes the optimal design method of robust tuned mass damper, considering the condition of the reducing effect and the variability of the frequency simultaneously, and then make a comparison between the effectiveness of the general design and the robust design. In the researches, it is quite common to design TMDs by simplifying MDOF model to SDOF model rather than the real structure. If the analytical results are similar, it is much rapider and easier to solve the problem by using SDOF model. Furthermore, the performance of system with TMD sometimes becomes worse when the structure is affected by the earthquakes, so the actual earthquake records are used to examine the result statistically in this study, and finally make a comparison between the performance of the general design and the robust design under the earthquakes. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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