請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/2127
標題: 可調式減振搪刀桿之性能研究
A Study on the Performance of an Adjustable Vibration-Reduction Boring Bar
作者: 呂智偉
WEI, LU CHIH
關鍵字: chatter
顫振
vibration-reduction boring bar
system identification
statistical regression
減振搪刀桿
系統辨識
統計迴歸
出版社: 機械工程學系所
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摘要: 切削加工過程中影響加工品質的因素之一為切削振動,而該因素最難掌控的項目為切削顫振,它所造成的噪音不僅讓使用者不適,還會影響機具的壽命及加工品質,本研究針對可降低切削振動之可調式減振搪刀桿,分析其系統特性,以掌握其減振性能。研究首先分析各式刀桿之減振裝置及其模式與適用場合,隨後以系統辨識的方法探討本研究之可調式減振搪刀桿之系統剛性與阻尼及其與減振裝置壓縮旋置量之關係,同時利用統計變異迴歸分析的方式建構此搪刀桿之剛性與阻尼模式,並經實驗驗證其適用性。 經系統辨識實驗,本研究之可調式減振搪刀桿之刀桿阻尼C與壓縮旋置量x之模式為C=-0.029x3+0.407x2-2.20x+12.4,此模式再經壓縮旋置量於0.5mm、2.5mm及4.5mm時驗證,模式之平均誤差在2%以內;刀桿剛性K與壓縮旋置量x之模式為K=303x3-1940x2+8890x +181000,經驗證其平均誤差在1%以內。減振器之阻尼C2=-0.026x3+0.351x2-1.726x+4.186,經驗證其平均誤差在5%以內;減振器剛性模式K2=121x3-932x2+4650x+4550,其驗證之平均誤差在7%以內,顯示本研究之方法適用於此一可調式減振搪刀桿之剛性與阻尼特性評估。
Vibration is one of the factors that affect the machining quality. Among many items, chatter is the most difficult item to control in vibration. It not only effect the life of machine tool and manufacturing quality but let manufacturer feel unwell for producing noise.This study is intended to investigate the system properties of an adjustable vibration-reduction boring bar. We first analyzed the structure and model of various vibration-reduction tool holders. The vibration characteristics, including the damping and the stiffness, and their relationship to the compression displacement of the adjustable vibration-reduction boring bar are then investigated via system identification approach. Models for damping and stiffness are then constructed based on experimental data with statistical regression by the analysis of variation. Further experiments are then conducted to verify these models. The relationship between the damping C and the compression displacement x of the boring bar by this approach is identified as C=-0.029x3+0.407x2-2.20x+12.4. This model is further verified with average errors less than 2% at compression displacements 0.5mm, 2.5mm and 4.5mm. The stiffness K is identified as K=303x3-1940x2+8890x +181000 with average verification errors less then 1%. The damping of vibration-reduction system C2 is identified as -0.026x3+0.35x2-1.73x+4.19 with average verification errors less then 5%. The stiffness of vibration-reduction system K2 is identified as 121x3-932x2+4650x+4550 with average verification errors less then 7%. It concludes that the approach and models of the study are suitable to evaluate the damping and the stiffness of the adjustable vibration-reduction boring bar.
URI: http://hdl.handle.net/11455/2127
其他識別: U0005-2508200814333100
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2508200814333100
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