書誌事項
- タイトル別名
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- Adaptive Feedforward Control for Improving Output Power Response of CO<sub>2</sub> Laser
- テキオウガタ フィードフォワード セイギョ ニヨル レーザ シュツリョク オウ
- Adaptive Feedforward Control for Improving Output Power Response of CO2 Laser
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Feedback control has been used to stabilize the steady-state output power of a CO2 laser to overcome the problems caused by the change in the temperature/deterioration of CO2 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 CO2 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 CO2 laser in addition to conventional feedback control. The model of a CO2 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
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- 計測自動制御学会論文集
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計測自動制御学会論文集 34 (3), 209-216, 1998
公益社団法人 計測自動制御学会
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詳細情報 詳細情報について
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- CRID
- 1390001204499741440
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- NII論文ID
- 10002492427
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- NII書誌ID
- AN00072392
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- ISSN
- 18838189
- 04534654
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- NDL書誌ID
- 4434434
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