臺灣博碩士論文加值系統

在本研究裡，我們用四個混成記憶材料製成之螺旋彈簧裝於懸吊平台，並在不同控制溫度下探討其模態自然頻率及阻尼比。螺旋彈簧是以超彈性NiTi線先熱處理成螺旋形狀，然後再包覆多層記憶型高分子材料套管在其外面而製成。首先研究單獨混成記憶螺旋彈簧的動態特性，在實驗中我們發現當溫度從室溫加熱到90℃，彈簧的第一自然頻率可降低50％；另一方面，我們也發現伴隨著溫度的增加彈簧的阻尼比會跟著減少，此現象應是溫度高於材料之玻璃轉換溫度所致材料之特性。最後我們研究被四個螺旋彈簧所支撐的平台在溫度控制下的自然頻率變化。研究中所推導之平台彈簧在前幾個模態下的自然頻率與實驗量測有相當的一致性， 而且實驗中也展示平台之振動位移振幅可隨著控制溫度之增加至90℃，而大幅降低至20%以下。

In this study, the natural frequency and the associated damping capacity of a platform suspended by four helical springs were investigated at different controlled temperatures. The helical spring was fabricated with multiple layers of pyro condensation polymeric sleeve wrapped outside a superelastic NiTi core which has been heat-treated into helical configuration beforehand. The dynamic characteristics of the hybrid shape-memory helical spring was first investigated experimentally. It was found that the first natural frequency of the spring can be decreased to 50% of the frequency at room temperature when the temperature was raised to 90oC. On the other hand, a decrease in the damping capacity of the spring was found accompanying the increase in temperature. Then, the change in the natural frequency of a platform supported by four helical springs was studied. The prediction of the natural frequency of the first few lower modes of the sprung-mass correlated well with the result from measurement. Moreover, we demonstrated the displacement amplitude of vibration for the platform under eccentric loading of imbalance mass was reduced significantly with the control temperature raised to 90℃.

第一章 緒論
第二章 文獻探討
第三章 理論分析探討
第四章 結果與討論
第五章 實驗結果與討論
第六章 結論與未來展望

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