研究生: |
魏百鍵 |
---|---|
論文名稱: |
基於局部滲透係數線上估計之樹脂轉注成型監控與流動控制 Process Monitoring and Flow Control in Resin Transfer Molding Based on Online Estimation of Local Permeability |
指導教授: | 姚遠 |
口試委員: |
汪上曉
陳榮輝 |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 67 |
中文關鍵詞: | 樹脂轉注成型 、局部滲透係數 、統計製程控制 、類神經網路 、模型預測控制 |
相關次數: | 點閱:2 下載:0 |
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樹脂轉注成型是以樹脂注入封閉模具,並同時浸潤纖維補強材之複合材料製造方法,近年來已被廣泛地應用於包含航太與汽車等各領域。其中纖維補強材料之滲透係數會隨屬性及幾何結構不同而改變,並影響樹脂流動特性,繼而影響最終產品品質。若能對其做出有效的線上估計,並基於該參數之線上量值建立程序控制系統,以使得流動波前能穩定地推展,便有助於產品良率的提升。
首先,本文針對真實製程中所發生的非同質預織物與纖維排列不規則改變而導致滲透係數不均勻之情形提出一種適合程序控制的滲透係數量測方法,以對FRP複合材料之局部平面滲透係數進行線上測量與分析。該方法之發展可分為兩階段。在第一階段利用灌注設備與影像系統連結LabVIEW進行硬軟體整合,來實行製程可視化(flow visualization)以觀測樹脂之填充過程。此外,為了能即時反應出模穴內之局部壓力,於透明模具中嵌入一組壓力傳感器陣列,以更瞭解樹脂填充過程之壓力特性。在第二階段,將灌注過程所擷取之波前與局部壓力代入一套基於達西定律所導出之滲透係數測量方法,並線上計算局部滲透係數。該方法有三項好處,第一,不受限於恆壓灌注過程;其次,對預織物之局部滲透係數和全局平均滲透係數均能有效測量;最後,可對滲透係數進行線上估計,使得量測值可以用於後續的程序控制。本文將該方法用於樹脂轉注成型的實驗中,並將估計結果與其他方法進行比較,從而驗證了此方法之有效性。
接著,本研究發展出基於局部滲透係數線上估計方法的控制架構,該架構係由原本的樹脂轉注成型製程上設立具備反饋校正功能的模型預測控制架構。首先在一般的模型預測控制系統,我們藉由蒐集大量的模擬數據來訓練類神經網路模型,該模型會以當前波前位置、壓力與方法一計算的滲透係數來預測波前之推展。然後再對模型使用最適化方法來求得下一個時刻的最佳灌注壓力。該控制架構有兩大用處,第一,能有效地控制流速,其次,能大幅度消除製程非線性。再來,本文會在該架構的外部建立PI控制器,使其依據反饋的誤差來校正速度設定點以彌補一些外部因素造成的模型失配與控制性能低落問題。最終,本文經由數次實驗來分別測試一般與具備反饋校正迴路之模型預測控制系統的控制性能,並將結果與直接用PI控制來控制波前速度之結果做比較,以驗證該控制架構的可行性。
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