雙指數奈米流體阻尼器之研發與橋梁應用

DEVELOPMENT AND BRIDGE APPLICATIONS OF NANOFLUID VISCOUS DAMPER WITH DUAL NONLINEARITY EXPONENTS

10.6652/JoCICHE.202304_35(2).0011

彭聖凱(Shen-Kai Peng)；游忠翰(Chung-Han Yu)；葉芳耀(Fang-Yao Yeh)；林子修(Zi-Xiu Lin)；張國鎮(Kuo-Chun Chang)

雙指數阻尼器 ； 奈米流體 ； 剪切增稠流體 ； 狀態空間 ； dual nonlinearity exponents damper ； nanofluid ； shear thickening fluid ； state-space

中國土木水利工程學刊

35卷2期（2023 / 04 / 01）

225 - 238

繁體中文;英文

雙指數奈米流體阻尼器於力量與速度之關係上，具有雙指數之力學特性；其物理機構簡單、流體調配簡易，可滿足結構需求，提升控制精度。本文首先製作數種奈米流體進行流變特性試驗，再透過流體力學理論建立理論模型，設計製造兩組阻尼器，並從試驗結果驗證數值模型之可靠性及其雙指數特性；接著採用實際橋梁車載試驗之數據，驗證於橋梁車行振動下，所消散之能量大幅低於傳統黏性阻尼器，其意味著小振動所造成之耗損較低，因此具有較佳的耐久性。最後建立狀態空間模型進行非線性歷時分析，驗證奈米流體阻尼器於上述優勢中，仍保有優秀的消能能力。

Nanofluid dampers, which feature dual nonlinearity exponents in force-velocity curvature, possess simple mechanisms and adjustable fluid properties that could be precisely manufactured for efficient structural control requirements. In this study, several different nanofluid samples were manufactured to observe the rheological properties. Then the theoretical model of the nanofluid damper is derived based on fluid mechanics theories. Two sets of nanofluid dampers are then designed and manufactured to verify the accuracy of the theoretical model and its dual nonlinearity exponent characteristics in force-velocity curvature. The low energy dissipation advantage, which could significantly increase the durability under slight vibration, was verified through an actual bridge vehicle test. Last but not least, a state-space model for nonlinear time history analysis of a simple seismically isolated bridge model is developed. The analysis revealed that nanofluid dampers have the aforementioned benefits while still having energy dissipation capability.

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