貼覆阻尼層對樑結構減振效果驗證

The Experimental Verfication of Vibration Reduction of Damping Layer pasted on Beam Structure

張家齊(Chia-Chi Chang)

指導教授 ： 蔡定江

國立臺北科技大學/機電學院/機電整合研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00538

摘要

本文針對貼覆阻尼層對樑結構減振效果作模擬分析與實驗驗證，藉以找出適當的貼覆參數。減振效果的指標，是以自由振動之初位移暫態響應的振幅衰減率作為依據。首先應用有限元素軟體ANSYS針對四種邊界樑結構作阻尼層貼覆位置與長度的基礎模態及暫態響應分析。在實驗部分，先以兩種不同型式試件作模態驗證，於不同阻尼層厚度下，對兩種邊界樑結構作阻尼層貼覆位置的初位移模態試驗。實驗與分析結果非常符合。除了整理出有效減振阻尼層貼覆參數外，研究中發現當阻尼層貼覆於樑之彎矩越大處，其對樑的減振效果越佳。經由本文可彙整出貼覆阻尼層對結構阻振的結果，在評估不同結構抑振及最佳貼覆位置方面，提供有用的資訊，具有工程應用的價值。

關鍵字

阻尼層 ； 衰減率 ； 基礎模態 ； 模態試驗

並列摘要

In this paper, the analysis and experimental verfication of vibration reduction of damping layer pasted on beam structures, the Appropriate parameters of the damping layer are extracted. In the transient response of free vibration with initial displacement, the decay rate of the amplitude at contain points, is taken as the effectiveness of vibrational reduction. This study focused on the fundamental mode with four boundary conditions of beams, position, and length of damping layer to analyze the dynamics characteristics, are obtained from FEM software ANSYS. The experimental verfication of modle with two different types, and in the different thickness of damping layer, the position of damping layer pasted for modal test with initial displacement. For a specified damping layer conditions, the results of modal test which can be found that the modal test, are much agreed with those from CAE analysis. The results also show that when the damping layer is posted at the maximum bending moment can get the most effective vibration reduction. From these shown results, the engineering would gain very useful information to evaluate vibration reduction and optimal placement for damping layer pasted on different structures.

並列關鍵字

damping layer ； decay rate ； fundamental mode ； modal test

參考文獻

[19] 高貫薰，貼覆及夾芯黏滯阻尼樑之振動分析，國立台北科技大學製造科技研究所碩士論文，台北，2007。

[29] D.J. Ewins, Modal Testing: Theory, Practice and Application (2nd ed.), England, Research Studies Press LTD, 2000.

[1] T.T. Soong and G.F. Dargush, Passive energy dissipation systems in structural engineering, New York: Wiley, 1997, p1-.p3, p5-p33.

[2] C.T. Sun and Y.P. Lu, Vibration Damping of Structural Elements, New York: Englewood Cliffs, 1995, p34-p37.

[3] E.M. Kerwin, "Damping of flexural waves by a constrained viscoelastic layer," Journal of the Acoustical Society of America, vol.31, no.7, 1959, pp.952-962.