Servo Design of a Novel No Bearing Rotating Optical Scanning System
| Autor: | Wei-Chien Tu, 杜維謙 |
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| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 This thesis proposes a novel optical scanning device for high speed large angle optical scanning. The traditional approaches include spinning prism and piezoelectric mirror. The mechanism based approach achieves large scanning angle but are slow in response; the piezoelectric drives are fast response, however, they have very limited strokes. The novel design in this thesis combines the strength of a smart mechanism with the piezo-drive to achieve high speed response with fairly large scanning angle. This thesis also looks into the iterative learning control (ILC) algorithm for mirror scanning. To avoid oscillation build up, this thesis introduces a switching algorithm to effectively suppress the initial low frequency oscillation. Due to the continuous scanning natural, the high frequency tracking error also tends to accumulate under prolonged ILC operation. This thesis investigates the alternative repetitive control (RC) and proposes a cascaded control to quickly suppress the initial low frequency oscillation and then to maintain a suppressed tracking error. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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