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This research proposes a quick, robust and energy-saving rotation control method for the air turbine spindle used in ultra-precision machining. We developed a high-precision, quick-response pneumatic pressure regulator and applied it to the rotation feedback control of an air turbine spindle. We also set a disturbance force observer in the feedback control system to avoid changes of the rotation speed...
This paper proposes a new suboptimal reactive control technique for controlling single body heaving wave energy converter (WEC). A self-tunable fuzzy logic controller is implemented to maximize the absorbed energy while respecting the physical limitations of the device. Particle swarm optimization (PSO) algorithm is utilized to carry out an on-line optimization process of the fuzzy membership functions...
Recently, the use of microchannel chips in micro total analysis systems, which can provide savings of natural resources and energy, has attracted attention in the medical field. Generally, the photolithography technology employed in semiconductor manufacturing is used to manufacture microchannel chip dies. However, it involves several processes such as mask fabrication and the application of a photoresist...
In this paper, we propose a modeling technique for the classification of the fault frequency components according to the fault state. Further, the optimal rotor design for an increase in reliability of an Interior Permanent Magnet type Brushless DC Motor (IPM type BLDCM) and a rise of the energy saving. For these improvements, fault states such as Dynamic Eccentricity Fault (DEF), Stator Inter-turn...
Titanium alloys and Inconel 718 are used in airplane bodies. Pure titanium alloys are used in medical equipment. Wet cutting, which generates a significant amount of cutting fluid, is adopted for the cutting of these difficult-to-cut materials. When near-dry cutting, which is environmentally friendly, is used instead, it easily damages tools, and the stock removal rate and machining accuracy worsen...
In recent years, optical scanning parts are in demand for use in high-performance information systems for reducing optical aberration, scatter, and diffraction rays. Laser printers use many scanning optical system parts, such as polygon mirrors and photoconductor drums. Polygon mirrors are created by polishing a plating or glassy material to a mirror finish. In this study, we shorten the manufacturing...
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