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RISS 인기검색어
- 검색키워드
- 저자 : Nan-Chyuan Tsai (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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To Prevent Crack for Thin-wall Workpieces during Milling Process by Torque Feedback
Mu-Ping Tsai,Nan-Chyuan Tsai,Chun-Chi Lin,Hsin-Lin Chiu 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Thin-wall tubular-geometry workpieces have been widely applied in aircraft and medical industries. Though numerous research reports are available that the tool path can be planned on the basis of preset surface profile before actual milling operation is performed, it is still difficult to predict the real-time surface profile errors for peripheral milling of thin-wall tubular workpieces. This research is focused on how to real-time formulate the appropriate applied cutting torque via feedback of spindle motor current. A few suitable cutting conditions which are able to prevent potential break/crack of thin-wall workpieces and enhance productivity but almost retain the same cutting quality is proposed. To achieve this goal, estimated surface profile error on machined parts due to deflections caused by both tool and workpiece is studied. The torque estimation approach by spindle motor current feedback and the corresponding fuzzy logic controller are employed. Compared with constant cutting torque during milling operation in tradition manner, it is observed that the time consumption of milling cycle by aid of the aforesaid fuzzy logic controller is greatly shortened while the resulted cutting accuracy upon finish of workpiece can be almost retained.
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Design of Drug-Delivery Micro-Wheel and Auto-Rolling Control by Change of Gravity Center
Jing-Yao Lai,Nan-Chyuan Tsai,Hsin-Lin Chiu 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
A micro-dosing system of overall size 5×5×4.2 mm3 for drug delivery is proposed and presented. The drug delivery system mainlyconsists of a micro-wheel and a micro-drug release mechanism. The motion of the micro-wheel is controlled by its center of gravityvia a running disk, which is placed within the hollow micro-wheel and attracted by the actuated micro-solenoids fabricated on theinner wall of micro-wheel in shift. In addition, the micro-wheel is controlled to roll forwards/backwards to the designated locationby two sliding mode control strategies: one for long-distance motion (to transport the drug to the vicinity of the spots under disease)and the other for short-distance motion (to decelerate down and stop at the exact drug-release location). On the other hand, the microdrugrelease mechanism is composed by a cantilever beam and a chamber filled up by medicine. The pyramid tip of the cantileverbeam deflected by the applied electrostatic force is designed to penetrate the micro-film which seals the chamber so that the medicinecan be released at the specified spot.
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