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Nagesh Samikkanu,Abu Muhammed Junaid Basha 한국유체기계학회 2012 International journal of fluid machinery and syste Vol.5 No.2
The Fighter aircraft transmission system consists of a light weight, High Speed Flexible Coupling (HSFC) known as Power Take-Off shaft (PTO) for connecting Engine gearbox (EGB) with Accessory Gear Box (AGB). The HSFC transmits the power through series of specially contoured metallic annular thin flexible plates whose planes are normal to the torque axis. The HSFC operates at high speed ranging from 10,000 to 18,000 rpm. The HSFC is also catered for accommodating larger lateral and axial misalignment resulting from differential thermal expansion of the aircraft engine and mounting arrangement. The contoured titanium alloy flexible plates are designed with a thin cross sectional profile to accommodate axial and parallel misalignment by the elastic material flexure. This paper investigates the effect of misalignment on the transmission characteristics of the HSFC couplings. A mathematical model for the HSFC coupling with misalignment has been developed for analyzing the torque transmission and force interaction characteristics. An extensive testing has been conducted for validating characteristics of the designed coupling under various misalignment conditions. With this the suitability of the model adapted for the design iteration of HSFC development is validated. This method will reduce the design iteration cycles of HSFC and can be extended for the similar development of flexible couplings.
Nagesh Samikkanu,Junaid Basha A. M.,Thakur Dinesh Singh 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
The high speed flexible coupling (HSFC) is used on the fighter aircraft gas turbine engines utilizing non-lubricated, metallic flexibleplates. The HSFC has to transmit power at high speeds typically ranging from 10,000 to 18,000 rpm from engine gear box to accessorygear box. The HSFC also accommodates large axial and lateral misalignments due to thermal expansion and flight dynamics. The imposedangular and axial displacement distorts or bends the flexible plates. To achieve an infinite life design for HSFC, it is necessary tokeep away from the different natural frequencies from the operating range of speeds apart from the optimal structural strength to accommodatelarger misalignment. This paper discusses about details of system analysis, design and evaluation of HSFC for gas turbine engines. The dynamic characteristics of the HSFC are investigated through the finite element analysis (FEA) and experimental verification. The present approach can be extended for the development of similar type of flexible couplings.
EMOTIVE FLUX : A BLINKING SEARCH FIELD
Nagesh Shinde,Kathleen Klinger 한국디자인학회 2015 한국디자인학회 학술발표대회 논문집 Vol.2015 No.10
Concrete and the virtual worlds are disordering our existence. Augmented virtuality is blurring the boundaries between the concrete and virtual worlds. A new mixed reality is taking over our lives. Intelligent human centered sensor feeds, enchanted objects (Rose, 2014) and Internet of thing(IoT), immersive ambient assistive technologies are becoming common, and we can not seem to get away from them. These interventions place a greater significance than usual on the experiential qualities of such technologies and necessitate the extension of the concept of emotive discourse into the immaterial.
Nagesh S. Ipper,Jung Eun Kim,Jun Hak Koo,Jang Hyun Hur,Chun Keun Lim 한국식물병리학회 2005 Plant Pathology Journal Vol.21 No.3
An antiviral producing bacterial strain was isolated from a ginseng rhizosphere in Kangwon province of Republic of Korea. In order to identify the bacterial strain, microbiological, physiological and biochemical tests were performed, along with RAPD, 16S rRNA,16S-23S rRNA ITS (intergenic spacer region) and DNA-DNA hybridization analyses. The bacterium was found to be a strain of Pseudomonas fluorescens,which was designated as Gpf01. The strain was grown in Muller-Hinton (MH) broth, and the culture supernatant obtained was filtered through a 0.45 µl filter. It was further boiled at 100oC and tested in two experiments for its ability to control a yellow strain of Cucumber mosaic virus (CMV-Y). In the first experiment,boiled culture filtrate (BCF) was treated on one half of the leaves of Chenopodium amaranticolor followed by CMV-Y inoculation on both halves. In the second experiment, BCF was treated on the lower leaves of Nicotiana tobacum var. Xanthi-nc, with the CMV-Y mechanically inoculated onto the upper untreated leaves. In the first experiment, BCF treatment was able to considerably reduce the number of viral lesion, and in the second experiment, plants treated with BCF showed no visible viral symptoms compared to the Muller-Hinton (MH) media treated controls 15 days post inoculation (dpi), and remained symptomless throughout the study period. Thus, Gpf01,identified as P. fluorescence, was able to produce an antiviral component in the culture filtrate, which was found to be heat stable, non-phytotoxic and effective in local as well as systemic hosts of CMV.
ON PATHOS BLOCK LINE CUT-VERTEX GRAPH OF A TREE
Nagesh, Hadonahalli Mudalagiraiah Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.1
A pathos block line cut-vertex graph of a tree T, written P BL<sub>c</sub>(T), is a graph whose vertices are the blocks, cut-vertices, and paths of a pathos of T, with two vertices of P BL<sub>c</sub>(T) adjacent whenever the corresponding blocks of T have a vertex in common or the edge lies on the corresponding path of the pathos or one corresponds to a block B<sub>i</sub> of T and the other corresponds to a cut-vertex c<sub>j</sub> of T such that c<sub>j</sub> is in B<sub>i</sub>; two distinct pathos vertices P<sub>m</sub> and P<sub>n</sub> of P BL<sub>c</sub>(T) are adjacent whenever the corresponding paths of the pathos P<sub>m</sub>(v<sub>i</sub>, v<sub>j</sub>) and P<sub>n</sub>(v<sub>k</sub>, v<sub>l</sub>) have a common vertex. We study the properties of P BL<sub>c</sub>(T) and present the characterization of graphs whose P BL<sub>c</sub>(T) are planar; outerplanar; maximal outerplanar; minimally nonouterplanar; eulerian; and hamiltonian. We further show that for any tree T, the crossing number of P BL<sub>c</sub>(T) can never be one.
A new technique to achieve Zero Voltage Switching in Resonant Reset Single Switch Forward Converter
NAGESH VANGALA,RAYUDU MANNAM 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Zero voltage switching (ZVS) or soft switching is gaining prominence for a variety of reasons. The benefits and the limitations of ZVS are well documented in the literature. Though the true ZVS is possible in full bridge converters, special design considerations need to be addressed in forward converters to achieve true ZVS. In this paper a new technique is proposed to achieve true ZVS without the loss of duty cycle or increased primary circulating currents in a single switch forward converter. Resonant reset technique is adapted for the transformer reset and the same is extended to achieve ZVS .This principle is demonstrated by developing a practical 240 watts DC to DC converter operating at 250 KHz and from a high voltage 400V DC bus. The measured data depict an improvement in the converter efficiency.
Surface Passivation Studies of n-type Crystalline Silicon for HIT Solar Cells
M. Nagesh,R. Suresh,R. Jayapal,K. N. Subramanya 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.1
Surface passivation of n-type Crystalline Silicon wafer using thin dielectric films is an important and major factor in improving photovoltaic performance of HIT solar cells. In this study, Numerical simulation was carried out by using AFORS-HET simulation software in which energy band diagram with and without surface passivation (a-Si:H(i)) was investigated and the highest conduction band off set obtained on n type c-Si wafer is 0.85 eV which is comparatively higher than p-type c-Si wafer which was reported between 0.1 and 0.15 eV. Performance of HIT solar cell with passivation layer is simulated and obtained effi ciency of 12.9% by incorporating actual conditions to compare with experimentally obtained data. It has been understood that applying an eff ective dielectric passivation of silicon surface resulted with high open circuit voltage (Voc) and low surface recombination lead to an increase of cell efficiency by 1.1% (from 11.8 to 12.9%). Also, the simulated results shows that to obtain good conversion effi ciency Defect density of interface (Dit) should be lower than 1x10 11 cm −2 eV −1 . Validation of the simulation results is done by conducting PECVD experiments for optimizing the amorphous silicon passivation to a layer thickness down to 15 nm. HIT Solar cells have been developed, using the optimum layer of passivation, and their performance have been studied. An improvement in the minority charge carrier lifetime of ~53 μs (from 215 to 268 μs) and on the other hand reduction in the surface recombination velocity of ~ 12.9 cm/s (from 65.11 cm/s down to 52.23 cm/s) has been achieved through passivation which eff ectively increased the open circuit voltage (Voc) from 0.690 to 0.705 V. In this preliminary study, a conversion efficiency of 11.3% of heterojunction with intrinsic thin layer (HIT) solar cell on 10 mm × 10 mm n-c-Si wafer has been obtained.