| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 102 === This study intends to analyze and improve the performance of nonlinear fluid damper by integrating efforts from numerical simulation, mockup fabrication, and experimental verification. At first, the three-dimensional configuration of damper is established for generating the numerical model to simulate the flow patterns associated with the original damper by using the commercial CFD code SC/Tetra. Then, the calculated results are utilized to predict its performance over different velocities and applied to illustrate the flow and pressure distributions for executing the flow visualization, which can provide important information for generating the design alternative. Moreover, the parametric study on the damper geometry is carried out with the aids of this numerical tool to attain an appropriate set of design parameters. Thereafter, the new damper prototype is manufactured via CNC technique for executing the comprehensive performance test in the NAR Labs (national applied research laboratories) at National Center for Research on Earthquake Engineering. Consequently, the numerical system can be verified according to these experimental results. Furthermore, the flow-induced performance reduction due to the temperature rise is examined and discussed in details. Also, an acceptable deviation (less than 10%) between CFD and test outcomes is identified on all cases considered in this work. In summary, the accomplishment of this study not only attains a better damper design, but also provides a systematic and reliable scheme to enhance performance for a nonlinear fluid damper
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