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Gupta P.,Sant Longowal Institute of Engineering And Technology | Khanna R.,Maharishi Markandeshwer University | Gupta R.D.,Maharishi Markandeshwer University | Sharma N.,Rp Inderaprastha Institute Of Technology
Journal of Engineering Technology | Year: 2012

Wire electric discharge machine (WEDM) is a spark erosion machining process to cut very hard conductive material with the help of a wire electrode. High strength low alloy steel (HSLA) is a hard alloy with high hardness and wear resisting property. The purpose of this study is to investigate the effect of parameters on kerf width for WEDM using HSLA as workpiece. HSLA is used in cars, trucks, cranes, bridges, roller coasters and other structures that are designed to handle large amounts of stress. It is revealed that kerf width decreases with increase in pulse on time, pulse off time, spark gap voltage and peak current. Kerf width increases with increase in wire tension. In order to evaluate the effect of selected process parameters, the response surface methodology (RSM) is used to formulate a mathematical model which correlates the independent process parameters with the desired kerf width. The central composite rotatable design has been used to conduct the experiments. The analysis of results indicates that the spark gap voltage, pulse on time, peak current and pulse off time have a significant effect on kerf width. Source


Pahwa K.,Maharishi Markandeshwer University | Mishra P.,Maharishi Markandeshwer University | Sinha H.P.,Maharishi Markandeshwer University | Pattnaik S.S.,National Institute of Technical Teachers Training and Research | Joshi J.G.,National Institute of Technical Teachers Training and Research
International Journal of Microwave and Optical Technology | Year: 2012

In this paper, a new diamond shaped fractal antenna has been presented to obtain multiband for wireless communication. The proposed antenna is based on the Sierpinski Carpet fractal structure. The patch has the dimensions of 20 mm × 30 mm. In terms of wavelength, the antenna size is 0. 322λ at lowest frequency (where λ = wavelength at resonant frequency). Three measured resonant frequencies appeared at 3.215GHz, 4.143 GHz and at 5.261 GHz for second iteration. The gain at respective resonant frequencies are 2.08 dBi, 3.01dBi and 1.7 dBi. The measured bandwidth are 110 MHz, 170 MHz and 112 MHz respectively in these three frequency bands. The antenna is simulated using IE3D. The designed antenna is fabricated using FR4 material and tested using site analyzer. The good agreement between simulated and measured results shows that antenna is multiband in nature. © 2012 ISRAMT. Source

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