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- 저자 : Boopathi C. S. (검색결과 2 건)
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Sivasubramanian M.,Boopathi C. S. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
A novel seven-level boost active-neutral-point-clamped (7LB-ANPC) inverter topology is presented in this paper. The structure of the inverter topology comprises of the combination of a cross-connected switched capacitor and T type neutral point clamped inverter with eight switches, four diodes, and one fl oating capacitor. The analysis begins with the study of detailed modes of operation where the steady state and dynamic behaviour are presented under diff erent loading conditions. To achieve a balanced fl oating capacitor voltage, a phase disposition multi-carrier modulation technique is used. By integrating a single fl oating capacitor, the voltage is balanced without any sensors and gain is increased by 1.5 times. The benefi ts of the proposed topology are less number of switching devices, low switching and conduction losses, also the fl oating capacitor voltage is self-balanced with good boosting ability, the measured THD values of voltage and current are 4.1% and 1.1% correspondingly and these values are less than the IEEE 519. Furthermore, to authorize the superiority of the proposed topology, its confi gurations are compared with existing inverter topologies. A prototype model is developed for validating the simulation results.
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R. Joseph Bensingh,S. Rajendra Boopathy,C. Jebaraj 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.11
The profile of a bi-aspheric lens is such a way that the thickness narrows down from center to periphery (convex). Injection molding of these profiles has high shrinkage in localized areas, which results in internal voids or sink marks when the part gets cool down to room temperature. This paper deals with the influence of injection molding process parameters such as mold surface temperature, melt temperature, injection time, V/P Switch over by percentage volume filled, packing pressure, and packing duration on the volumetric shrinkage and deflection. The optimal molding parameters for minimum variation in volumetric shrinkage and deflection of bi-aspheric lens have been determined with the application of computer numerical simulation integrated with optimization. The real experimental work carried out with optimal molding parameters and found to have a shallow and steep surface profile accuracy of 0.14 and 1.57 mm, 21.38-45.66 and 12.28-26.90 µm, 41.56-157.33 and 41.56-157.33 nm towards Radii of curvatures (RoC), surface roughness (Ra) and waviness of the surface profiles (profile error Pt), respectively.
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