Damping, mass, and velocity effects of a passing vehicle for indirectly measuring the first bridge frequency by EMD technique
| Autor: | Lee, Wei-Chun, 李唯鈞 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 The indirect approach for measuring bridge frequencies from a passing vehicle has become one prosperous method recently in that it provides mobility and liability to set up sensors while it is relatively cheap to maintain the instruments. Following the theory of vehicle-bridge interaction (VBI) developed in the 1990s, the vehicle is modeled as a sprung mass moving over a simply supported beam, and the VBI system is solved by the finite element method. The contact force induced by the vehicle causes the vibration of the bridge while bridge vibration turns back to the vehicle. Therefore, one can identify the bridge frequencies from the spectral analysis of the vehicle. However, there exist many factors affecting identification of bridge frequencies such as existing traffic, road surface roughness, and damping of vehicle. How to effectively reduce the noises in the frequency spectra is of urgent need. This study investigates the effect of vehicle damping on the identification of bridge frequency while considering road surface roughness. To further enhance the results of identification, both the empirical mode decomposition (EMD) and ensemble empirical mode decomposition (EEMD) are adopted in the spectral analysis. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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