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Sudhirsastry Y.B.,Institute of Aeronautical Engineering | Krishna Y.,DRDL | Budarapu P.R.,Bauhaus University Weimar
Computational Materials Science | Year: 2015

The lateral buckling analysis of cold-formed thin walled beams subjected to pure bending moments has been performed. The critical buckling loads are estimated based an optimization criteria. The estimated critical buckling stresses are compared with the published results, they show excellent agreement. The effect of the beam length, radius and thickness of the flanges and the length of the extended open flanges, on the critical buckling stresses have been studied for several combinations of the geometric parameters of the beam. Among the three beams, the critical buckling moments for the beam with the extended open flanges are found to be the maximum. However, considering the material and manufacturing costs, beams with rounded cross section are efficient in resisting the buckling loads. © 2014 Elsevier B.V.

Sridhar P.,Institute of Aeronautical Engineering | Singh B.P.,St Martins Engineering College
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2012

Insulation failure within the windings of a power transformer arises due to over voltages, under voltages, notches, glitches, etc. A widely used technique to detect these power transformer insulation failures during an impulse test is the comparison of neutral current waveforms. Any shift in the recorded waveforms between reduced and full voltage confirms the existence of a fault in the windings. Hence, a proper analysis of neutral current waveforms is necessary to assess the condition of the insulation of power transformer winding. In order to carry out a wave shape analysis, a 61 MVA, 11.5/230 kV generator transformer is used and faults are created in the disks of high-voltage windings at specific locations. Neutral currents are recorded by applying a 100 V, low-voltage impulse. Noise inherent in the neutral current during recordings is isolated using a biorthogonal wavelet and the denoised signals are analyzed using the Shannon wavelet for identification of a fault in the winding. © TÜBITAK.

Santosh D.H.,JNTUH College of Engineering | Mohan P.G.K.,Institute of Aeronautical Engineering
Proceedings of 2014 IEEE International Conference on Advanced Communication, Control and Computing Technologies, ICACCCT 2014 | Year: 2015

Object tracking is a primary step for image processing applications like object recognition, navigation systems and surveillance systems. The current image and the background image is differentiated by approaching conventionally in image processing. Image subtraction based algorithms are mainly used in extracting features of moving objects and take the information in frames. Here three algorithms namely Extended Kalman Filter, Gaussian Mixture Model (GMM), Mean Shift Algorithm are compared in the context of multiple object tracking. The comparative results show that GMM performs well when there are occlusions. Extended Kalman filter fails because of abnormal behavior in the distribution of random variables when there is nonlinear transformation. It cannot identify multiple objects when there are occlusions. Mean shift algorithm is best suitable for single object tracking and is very sensitive to window size which is adaptive. Results show that this algorithm has the limitation to detect multiple objects when there is even slight occlusion. © 2014 IEEE.

Sridhar P.,Institute of Aeronautical Engineering | Purna Chandra Rao V.,Lords Institute of Engineering and Technology | Singh B.P.,Bharat Heavy Electricals Ltd.
Lecture Notes in Electrical Engineering | Year: 2016

In modern power distribution system increasing the growth of electrical power demand is destined results in a corresponded maximization of the short circuits in the power system network. So many imperative methodologies are concerned and evaluated to establish satisfactory operation, in that Fault Current Limiter (FCL) suggests the best way to minimize the short circuited stresses and may bourn the electromagnetic stress over associated devices as well as reduce the rated capacity of circuit breakers for fault initiated transients from effecting spurious trips. This analysis illustrates the utilization of proposed FCL for analyzing power system dynamics and mitigation of multiple fault conditions at 5 buses can have gallant power quality concerns. This paper highlights the integration of a single switch with voltage controlled three phased FCL is planned for 5 bus system by using Matlab/Simulink. © Springer India 2016.

Rani V.A.,Institute of Aeronautical Engineering | Kumari Y.B.,Jawaharlal Nehru Technological University
Asian Journal of Chemistry | Year: 2016

Green synthesis of (4Z)-4-benzylidene-1-methyl-2-styryl-1H-imidazol-5(4H)-one derivatives have been developed in good yields and tested for their antibacterial activities against Escherichia coli, Providencia aeruginosa, Pseudomonas azotogensis and Baccilus subtillis. Some of the synthesized compounds possess good activity against Escherichia coli and Baccilus Subtillis compared to standard drug streptomycin.

Yadav S.,Indian Institute of Technology Bombay | Yamasani P.,Institute of Aeronautical Engineering | Kumar S.,Indian Institute of Technology Bombay
Energy Conversion and Management | Year: 2015

In this paper, experimental investigations on micro power generation using thermoelectric modules installed around a microcombustor are studied. The work is aimed at developing a combustion based micro power generator as an alternative to low power density electrochemical batteries. A three step micro-combustor is fabricated with mild-steel as the material. Liquefied petroleum gas (LPG)-air mixture is used as fuel-air mixture to operate the microcombustor. A heating cup is used to increase the heat recirculation from hot combustion products thereby enhancing the flame stability limits. The heating cup is fabricated using aluminum material to obtain uniform temperature distribution for improved power generation at smallest scales. The overall conversion efficiency of the micro power generator has been observed to increase with the number of modules mounted on the micro-combustor system as compared to two and one modules. An overall conversion efficiency of 1.2% for one module, 2.56% for two modules and 4.6% for four module configuration was achieved. The overall conversion efficiency reported in the present work is highest for such small scale combustion based micro power generators in comparison to earlier work reported in the literature. A maximum power of 1.56 and 2.35 W respectively is obtained for two and four module configurations. © 2015 Elsevier Ltd. All rights reserved.

Sai B.V.,Institute of Aeronautical Engineering | Arif S.,Institute of Aeronautical Engineering
International Journal of Applied Engineering Research | Year: 2015

This article is about the most efficient method of transferring work from cylinder to shaft. To overcome the disadvantages of gasoline engine, super-efficient engine was invented by GENARO TABAG, but it is very complicated. So some modifications are suggested in this article, to increase the efficiency, simplicity of super-efficient engine. In modified super-efficient engine, we use free wheels to convert linear motion to rotatory motion. The method proposed in this article is one of the most efficient way of transferring work from cylinder to shaft. © Research India Publications.

Budarapu P.R.,Bauhaus University Weimar | Yb S.S.,Institute of Aeronautical Engineering | Javvaji B.,Indian Institute of Science | Mahapatra D.R.,Indian Institute of Science
Frontiers of Structural and Civil Engineering | Year: 2014

We propose a method to estimate the natural frequencies of the multi-walled carbon nanotubes (MWCNTs) embedded in an elastic medium. Each of the nested tubes is treated as an individual bar interacting with the adjacent nanotubes through the inter-tube Van der Waals forces. The effect of the elastic medium is introduced through an elastic model. The mathematical model is finally reduced to an eigen value problem and the eigen value problem is solved to arrive at the inter-tube resonances of the MWCNTs. Variation of the natural frequencies with different parameters are studied. The estimated results from the present method are compared with the literature and results are observed to be in close agreement. © 2014 Higher Education Press and Springer-Verlag Berlin Heidelberg.

Yadav S.,Indian Institute of Technology Bombay | Sharma P.,Indian Institute of Technology Bombay | Yamasani P.,Institute of Aeronautical Engineering | Minaev S.,Far Eastern Federal University | Kumar S.,Indian Institute of Technology Bombay
Applied Physics Letters | Year: 2014

A prototype micro-thermoelectric power generator (micro-TEG) system based on micro-combustion concept has been developed and presented here. The system consists of Bismuth-Telluride based thermoelectric modules mounted on a 0.5 cm3 volume microcombustor. The hot combustion gases from the microcombustor are allowed to flow in reverse direction through a heating cup to maximize the heat transfer from hot combustion products to thermoelectric modules. The system delivers a maximum power of 2.35 W with a fuel (propane) flow rate of 3.98 g/h. Maximum power is achieved at a voltage of 4.34 V, current 0.54 A with a maximum conversion efficiency of 4.58%. The system generates electric power with an improvement of over 83% in energy conversion efficiency over existing micro-TEG systems. © 2014 AIP Publishing LLC.

Chandran A.A.,Institute of Aeronautical Engineering | Younis M.I.,King Abdullah University of Science and Technology
3rd International Conference on Signal Processing and Integrated Networks, SPIN 2016 | Year: 2016

Wireless communication uses Radio Frequency waves to transfer information from one point to another. The modern RF front end devices are implementing MEMS in their designs so as to exploit the inherent properties of MEMS devices, such as its low mass, low power consumption, and small size. Among the components in the RF transceivers, band pass filters and mixers play a vital role in achieving the optimum RF performance. And this paper aims at utilizing an electrostatically actuated micro cantilever beam resonator's nonlinear frequency mixing property to realize a Mixer-Filter configuration through multi-frequency excitation. The paper studies about the statics and dynamics of the device. Simulations are carried out to study the added benefits of multi frequency excitation. The modelling of the cantilever beam has been done using a Reduced Order Model of the Euler-Bernoulli's beam equation by implementing the Galerkin discretization. The device is shown to be able to down-convert signals from 960 MHz of frequency to an intermediate frequency around 50 MHz and 70 MHz in Phase 1 and 2, respectively. The simulation showed promising results to take the project to the next level. © 2016 IEEE.

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