Bengal Engineering and Science University
Howrah, India

Indian Institute of Engineering Science and Technology, Shibpur , commonly abbreviated as IIEST Shibpur, is a premier public institution for research and education in engineering, science and technology, located at Shibpur, in Howrah district, in the state of West Bengal in India. IIEST Shibpur is one of the top engineering institutes in the country. It is classified as an Institute of National Importance by the Government of India since 2014.Established in 1856, it was formerly an institution under the state government of West Bengal and known as Bengal Engineering and Science University, Shibpur from 2004 to 2014 and Bengal Engineering College, Shibpur prior to that.In March 2014, it was elevated to national status by amending the National Institutes of Technology and Science Education and Research Act, 2007, thus renaming it to IIEST Shibpur and granting it the status of Institutes of National Importance.The institute offers Bachelor's, Master's and Doctorate degrees in Engineering and Architecture as well as Master's and Doctorate degrees in Science and Management in addition to various part-time courses. Wikipedia.

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Basu S.,Jadavpur University | Bhattacharyya P.,Bengal Engineering and Science University
Sensors and Actuators, B: Chemical | Year: 2012

Graphene, a monolayer of graphite sheet consisting of sp2 hybridized carbon atoms covalently bonded to three other atoms (discovered in 2004), has recently attracted the attention of chemical sensor researchers owing to its unprecedented structural, mechanical and electrical properties. Excellent mechanical strength (Young modulus ∼0.05 TPa), potentiality of ultrafast electron transport (highest mobility ∼200,000 cm 2/V s) along with the best surface to volume ratio has opened up the opportunity to use the material for future gas and vapor sensors with ultra fast speed and long-term durability. Since it is a two dimensional material, every atom of graphene may be considered a surface atom and as a result every atom site may be involved in the gas interactions. This feature of graphene can eventually be responsible for its ultra sensitive sensor response with the lowest detection capability approaching even a single molecule. Further, the ease of functionalization of the material either by chemical means (absorption of many molecules like oxygen or hydrogen) or by application of voltage or pressure, facilitates bandgap-engineering which in turn may lead to a possible solution to the selectivity issues, the perennial problems of chemical sensors. In this review, the latest advancement and new perspectives of graphene based gas and vapor sensors have been discussed critically. © 2012 Elsevier B.V.

Konar P.,Bengal Engineering and Science University | Chattopadhyay P.,Bengal Engineering and Science University
Applied Soft Computing Journal | Year: 2011

Condition monitoring of induction motors is a fast emerging technology in the field of electrical equipment maintenance and has attracted more and more attention worldwide as the number of unexpected failure of a critical system can be avoided. Keeping this in mind a bearing fault detection scheme of three-phase induction motor has been attempted. In the present study, Support Vector Machine (SVM) is used along with continuous wavelet transform (CWT), an advanced signal-processing tool, to analyze the frame vibrations during start-up. CWT has not been widely applied in the field of condition monitoring although much better results can been obtained compared to the widely used DWT based techniques. The encouraging results obtained from the present analysis is hoped to set up a base for condition monitoring technique of induction motor which will be simple, fast and overcome the limitations of traditional data-based models/techniques. © 2010 Elsevier B.V. All rights reserved.

Saha S.K.,Bengal Engineering and Science University
Experimental Thermal and Fluid Science | Year: 2012

The experimental friction factor and Nusselt number data for laminar flow through a circular duct having axial corrugation and fitted with centre-cleared twisted-tape have been presented. Predictive friction factor and Nusselt number correlations have also been presented. The thermohydraulic performance has been evaluated. The major findings of this experimental investigation are that the centre-cleared twisted tapes in combination with axial corrugation perform better than the individual enhancement technique acting alone for laminar flow through a circular duct up to a certain amount of centre-clearance. © 2011 Elsevier Inc.

Dutta A.,Bengal Engineering and Science University | Datta J.,Bengal Engineering and Science University
Journal of Physical Chemistry C | Year: 2012

The present article deals with the comprehensive electrocatalytic study of the binary and ternary combinations of Ni and Au with Pd for use as the anode component of a direct ethanol fuel cell (DEFC) operating with an anion-exchange membrane (AEM). The catalysts were grown on a carbon support by chemical reduction of the respective precursors. The information on surface morphology, structural characteristics, and bulk composition of the catalyst was obtained using transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. Brunauer-Emmett-Teller (BET) surface area and the pore widths of the catalyst particles were calculated by applying the BET equation to the adsorption isotherms. The electrochemical techniques like cyclic voltammetry, chronoamperometry, and impedance spectroscopy were employed to investigate the electrochemical parameters related to electro-oxidation of ethanol in alkaline pH on the catalyst surfaces within the temperature range 20-80 C. The results show that the use of the ternary PdAuNi catalyst at the anode of an in-house fabricated DE(AEM)FC can increase the peak power density by more than 175% as compared with the use of the monometallic Pd catalyst, 108% as compared with the use of the bimetallic PdNi catalyst, and 42% as compared with the use of the bimetallic PdAu catalyst. The higher yield of the reaction products CH3CO2 - and CO3 2- on the PdAuNi catalyst compared to its single and binary counterparts in alkaline medium, as estimated by ion chromatography, further substantiates the catalytic superiority of the PdAuNi catalyst to a remarkable extent over the other catalysts studied. © 2012 American Chemical Society.

Chatterjee S.,Bengal Engineering and Science University
Journal of Sound and Vibration | Year: 2010

An active, standalone vibration absorber utilizing the state feedback taken from the absorber mass is proposed. Expressions of the optimum absorber parameters are obtained both by optimizing the Η∞ norm of the frequency response function. For improved transient response featuring low peak response and fast attenuation, the design procedure utilizes the mode equalization followed by the maximization of the damping. An interesting feature of the proposed absorber is that the performance of the absorber does not require having its natural frequency close to the natural frequency of the primary system as is generally the case for tuned passive absorbers or other active and semi-active tuned vibration absorbers. In fact, the performance of the proposed system can be progressively enhanced by increasing the absorber frequency. Compared to the optimum passive absorber, the optimal active absorber can yield wider bandwidth of operation around the natural frequency of the primary system and lower frequency response within the suppression band. The active absorber also offers better transient response compared to the passive absorber both optimized for the best transient responses. The efficacy of the absorber is analyzed both for a single-degree-of-freedom and beam like primary structure. © 2010 Elsevier Ltd.

Saha S.K.,Bengal Engineering and Science University
Chemical Engineering Communications | Year: 2013

The experimental friction factor and Nusselt number data for laminar flow through a circular duct having integral helical corrugations and fitted with a helical screw-tape insert are presented. Predictive friction factor and Nusselt number correlations are also presented. The thermohydraulic performance was evaluated. The major findings of this experimental investigation are that the helical screw-tape insert in combination with integral helical corrugations performs significantly better than the individual enhancement technique acting alone for laminar flow through a circular duct up to a certain value of the fin parameter. This research finding is useful in designing tubes carrying solar thermal mass of viscous oil in a parabolic trough solar collector used in environmentally sound and increasingly cost-effective solar thermal electric power plants. The result is also useful in designing heat exchangers used in process industries. © 2013 Copyright Taylor and Francis Group, LLC.

Chattopadhyay A.K.,Bengal Engineering and Science University
IEEE Industrial Electronics Magazine | Year: 2010

With the rapid developments of high-power semiconductors and microprocessordigital signal processor (DSP)-based control and estimation technologies, high-power, high-performance ac drives using either induction motors (IMs) or synchronous motors (SMs) with cycloconverters or inverters have replaced the earlier dc drives for applications in the steel industry during the last 30 years. In this article, a review of the state-of-the-art high-power devices, such as silicon-controlled rectifiers (SCRs), gate turn-off thyristors (GTOs), insulated-gate bipolar transistors (IGBTs), integrated gate-commutated thyristors (IGCTs), and injection-enhanced gate transistors (IEGTs), converters, such as cycloconverters and three-level inverters, and control technologies adopted for such drives, such as the vector control (VC) and the direct torque control (DTC), is presented with brief features of the industrial ac drives developed for the steel industry by the leading drive manufacturers worldwide. © 2010 IEEE.

Chatterjee S.,Bengal Engineering and Science University
Journal of Sound and Vibration | Year: 2013

The present paper analyzes the dynamics of some simple models of a mechanical vibratory system kinematically driven by dry and nonlinear viscous friction dampers. Three different types of models of the mechanical system, viz., single and two degrees-of-freedom linear systems and a single degree-of-freedom Duffing oscillator are considered in the article to explore the dynamics of dry friction driven oscillation. Through detailed analysis it is shown that such systems can lock with the oscillating friction slider, particularly around wide frequency bands near the resonances of mechanical systems. Such a phenomenon is termed as the resonant locking in the present paper. The analytical results are substantiated by direct numerical simulations. Finally a slightly general case is analyzed where a simple system is considered to be driven by a nonlinear damper (pth power damper). Resonant locking is found to exist also for a nonlinear damper driven system. © 2013 Elsevier Ltd. All rights reserved.

Chatterjee S.,Bengal Engineering and Science University
Journal of Sound and Vibration | Year: 2011

Several important applications use nonlinear feedback methods for synthetically inducing self-excited oscillations in mechanical systems. The van der Pol and saturation function type feedback methods are widely used. The effects of time-delay on the self-excited oscillation of single and two degrees-of-freedom systems under nonlinear feedback have been studied in this paper. It is shown that a single degree-of-freedom oscillator with the van der Pol type nonlinear feedback can produce unbounded response in presence of time-delay. In general, an uncontrolled time-delay in the feedback changes the state of oscillations in an uncertain manner. Therefore, a bounded saturation type feedback with controllable time-delay is proposed for inducing self-excited oscillations. The feedback signal is essentially an infinite weighted sum of a nonlinear function of the state variables of the system measured at equal intervals in the past. More recent is the measurement, higher is the weight. Thus, the feedback signal uses a large amount of information about the past history of the dynamics. Such a control signal can be realized in practice by a recursive means. The control law allows three parameters to be varied namely, the time-delay, feedback and recursive gains. Multiple time scale analysis is used to plot amplitude vs. time-delay curves. Time-delay can be controlled to vary the amplitude of oscillation as well as to switch the oscillation from one mode to the other in a two degrees-of-freedom system. It is shown that a higher recursive gain can exercise a better and a more robust control on the amplitude of oscillation of the system. Analytical results are compared with the results of numerical simulations. © 2010 Elsevier Ltd. All rights reserved.

Datta S.,Bengal Engineering and Science University | Chattopadhyay P.P.,Bengal Engineering and Science University
International Materials Reviews | Year: 2013

Current trends in the progress of technology demand availability of materials resources ahead of the advancing fronts of the application areas. During the last couple of decades, significant progress has been made in computational and experimental design of materials. Among the potential computational techniques, soft computing stands in distinction due to the inherent flexibility in capturing the complexity of the problem in global scale. Since 1990s remarkable success has been achieved in soft computing activities in different facets of materials science and engineering. Extensive efforts have been devoted in design of metals and alloys based on composition-process- microstructure-property correlation. The present review aims to address the contribution of soft computing in the field of structural metals and alloys including processing and joining. The critical issues concerning applicability of particular techniques in specific materials problem have been particularly emphasised encompassing the scope of integrating the gradual progress in different techniques in hybrid and tandem framework to address greater complexities in larger length and time scale. Attempt has also been made to emphasise on the evolution of newer knowledge and materials through soft computing activities. Finally, the potential of soft computing techniques in futuristic design approaches has been critically enumerated. © 2013 Institute of Materials, Minerals and Mining and ASM International.

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