彈性介質於雙層振動平板減振之研究

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Title:	彈性介質於雙層振動平板減振之研究
Other Titles:	A study of vibration mitigation on an elastic medium dual-plate system
Authors:	林庭羽;Lin, Ting-Yu
Contributors:	淡江大學航空太空工程學系碩士班王怡仁;Wang, Yi-Ren
Keywords:	衝擊錘;自然振頻;頻率響應;dual-plate system;passive damping system
Date:	2014
Issue Date:	2015-05-04 10:01:08 (UTC+8)
Abstract:	減振在工業上扮演一個極重要的角色，不管是定點加上減振器的效果或是多個減振器對同一振動主體所產生的減振效果皆被廣泛的研究，本研究係研究一種簡單、成本低、易被工程業界使用的被動減振方式。吾人將以一厚度為10公厘之平板假設為主體，並以彈性介質為中間減振介質連接一平板或薄膜做為其減振器，利用ANSYS及衝擊錘實驗求得主體之頻率響應並互相比對。藉此來找出主體之自然振頻，並在其振頻範圍附近進行實驗，以實際模擬其減振效果。吾人將利用實驗實做方法量測出其振幅，以不同之彈性介質重複實驗，藉此來找出最佳介質材料及介質形狀。 Vibration can affect the stability of a structure, and constant vibration can lead to fatigue and structure damage. Vibration damping methods can roughly be divided into two types: active and passive. Generally speaking, active damping is the most effective approach to vibration damping; however, most conventional machine tools vibrate in the vertical direction, which is best dealt with using a tuned-mass damper comprising a mass and one or more spring. This study proposed a novel concept for vibration mitigation on an elastic medium dual-plate system. In this research, a 10 millimeter plate served as a main body and using the elastic medium as vibration dampers, another plate or membrane was connected with the damper to construct a plate-damper-plate (membrane) passive vibration reduction system. The natural frequency of the main plate was obtained by using the “Impact hammer” experimental method. These result were verified by using theoretical prediction and the ANSYS analysis. 4 kinds of elastic medium dampers were considered in this study. Each damper was connected with the main plate and the other side was attached with another plate or membrane, respectively. The experiments of measuring their vibration amplitudes were carried out by using laser displacement transducer. Another 3 kinds geometric shapes of elastic medium dampers were also considered in this study to find the optimum combination of the passive damping system. We found that the firmer the elastic medium, the better the damping effects. The closed and with cross shape elastic medium damper showed the best damping effect compare with other combination. Experiments verify the efficacy of the proposed novel device in improving damping performance beyond what has been achieved using conventional devices. We also provide an explanation of the theoretical underpinnings of the design as well as the implications of these findings with regard to future developments.
Appears in Collections:	[Graduate Institute & Department of Aerospace Engineering] Thesis

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