適応型フィードフォワード制御によるレーザ出力応答の改善 Adaptive Feedforward Control for Improving Output Power Response of CO_2 Laser

この論文にアクセスする

この論文をさがす

著者

抄録

Feedback control has been used to stabilize the steady-state output power of a CO<sub>2</sub> laser to overcome the problems caused by the change in the temperature/deterioration of CO<sub>2</sub> gas. The transient response, however, is as slow as a few hundred milliseconds because of the slow dynamics of a thermopile power sensor. When machining conditions of a CO<sub>2</sub> laser are changed, this rather slow response requires an extra dwell time, resulting in low productivity of the machining.<br>To cope with this problem, the authors have developed adaptive feedforward control for a CO<sub>2</sub> laser in addition to conventional feedback control. The model of a CO<sub>2</sub> laser is described as a gain, which is varied by the setting parameters; laser power, pulse frequency and duty factor, as well as gas conditions. In this paper, two new variables, effective discharge power and threshold discharge power, are introduced to obtain a compact and adjustable model. With the proposed control system, the step response time of a laser power is reduced to less than ten milliseconds without overshoot, and can be set to desired constant time. The effects of such a fast and stable response on the machining speed and machining quality are examined. The experimental results show that for thin metal line-cutting, neither the melt-off area nor dross is observed even in the no-dwell time case. For thin metal hole-cutting, the machining speed is improved by 30%.

収録刊行物

  • 計測自動制御学会論文集  

    計測自動制御学会論文集 34(3), 209/216, 1998-03-31 

    The Society of Instrument and Control Engineers

参考文献:  11件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  1件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10002492427
  • NII書誌ID(NCID)
    AN00072392
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04534654
  • NDL 記事登録ID
    4434434
  • NDL 雑誌分類
    ZM11(科学技術--科学技術一般--制御工学)
  • NDL 請求記号
    Z14-482
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
ページトップへ