現階段市面上常見之阻尼器多屬於鑽孔式與外環式，然而無論是鑽孔式或是外環式皆有不同的缺點，鑽孔式在低速時的性能較低；而外環式則式加工不易。本研究提出阻尼器性能數值模擬，並透過不同設計參數組合，評估其對阻尼器性能以及遲滯迴圈之影響；藉由數值模擬與實驗量測兩項利器之結合，來了解各參數與阻尼力的相關性，進而確認可能之關鍵參數，以做為未來進行新型設計之研發。首先量測阻尼器之性能曲線，並且利用商用熱流分析軟體SC/Tetra進行模擬，再將兩者進行比對並且微調模擬參數，進而確立阻尼器模擬方法之可靠度。接著將針對不同流孔、溫度、速度進行模擬，並搭配文獻上之相關阻尼器現象進行比對，以確立所建立模擬模式之準確性。
接著將針對傳統之阻尼器型式支流場特性做分析，進行設計變更，並且搭配不同流孔大小、溫度、速度進行模擬後再與傳統型式之阻尼器進行比對。在重覆上述步驟後得到最佳設計，並且於國家地震中心進行量測，來得到完整之遲滯迴圈圖。從模擬與實驗結果可得知，模擬與實驗結果誤差皆在10%以下。本研究成功找出阻尼器之模擬方法，並且藉由數值模擬得到最佳設計後，在進行實驗量測得到新型式液流阻尼器。

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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