College of Engineering, Pune
Pune, India

College of Engineering, Pune is an autonomous engineering college with an affiliation to the University of Pune in Pune, Maharashtra, India. Established in 1854, it is the third oldest engineering college in Asia, after the College of Engineering, Guindy and IIT Roorkee . The students and alumni of College Of Engineering, Pune are colloquially referred to as COEPians. The college's study model was referred to, in the early 1950s, as the "Poona Model".College of Engineering, Pune is located at the confluence of two rivers, the Mula and the Mutha. Wikipedia.

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Talole S.E.,Indian Defence Institute of Advanced Technology | Kolhe J.P.,Indian Defence Institute of Advanced Technology | Phadke S.B.,College of Engineering, Pune
IEEE Transactions on Industrial Electronics | Year: 2010

In this paper, a feedback linearization (FL)-based control law made implementable using an extended state observer (ESO) is proposed for the trajectory tracking control of a flexible-joint robotic system. The FL-based controller cannot be implemented unless the full transformed state vector is available. The design also requires exact knowledge of the system model making the controller performance sensitive to uncertainties. To address these issues, an ESO is designed, which estimates the state vector, as well as the uncertainties in an integrated manner. The FL controller uses the states estimated by ESO, and the effect of uncertainties is compensated by augmenting the FL controller with the ESO-estimated uncertainties. The closed-loop stability of the system under the proposed observercontroller structure is established. The effectiveness of the ESO in the estimation of the states and uncertainties and the effectiveness of the FL + ESO controller in tracking are demonstrated through simulations. Lastly, the efficacy of the proposed approach is validated through experimentation on Quanser's flexible-joint module. © 2010 IEEE.

Goyal R.K.,College of Engineering, Pune | Katkade S.S.,College of Engineering, Pune | Mule D.M.,College of Engineering, Pune
Composites Part B: Engineering | Year: 2013

Barium titanate (BaTiO 3) filled polymethylmethacrylate (PMMA) composites were prepared using the simple solution method followed by hot pressing. The content of BaTiO 3 was varied from 0 to 65 vol.%. Scanning electron microscopy showed good dispersion and adhesion of BaTiO 3 with the PMMA matrix. The dielectric constant of the composites increased significantly. There was weak dispersion in the dielectric constant of the composites (up to 45 vol.%) with frequency between 100 Hz and 15 MHz. The dissipation factor of the composites increased from 0.021 for pure PMMA to 0.029 for 45 vol.% composites. However, 65 vol.% composite showed dispersion in dielectric constant with increasing frequency and higher dissipation factor. The Lichtenecker equation agreed well with the experimental data. The microhardness and the glass transition temperature of the composites increased approximately 4.7-fold and 42 °C, respectively, compared to pure PMMA. The CTE of the 65 vol.% composite is close to that of copper. © 2012 Published by Elsevier Ltd.

Performance analyses of an HFC-404A refrigeration system for a smooth U-tube condenser and a micro-fin U-tube condenser are carried out for various operating conditions. This article mainly reports performance testing of the above-mentioned condensers for various operating parameters and their effect on the performance of refrigeration systems. The condensers used are shell and U-tube types, with refrigerant through a tube and cooling water through a shell. It also reports the performance enhancement of the system using a micro-fin tube condenser relative to a smooth-tube condenser system. The cooling capacity of the system is increased by 10%, and the coefficient of performance of the system is improved up to 17% using a micro-fin tube condenser. © 2012 Copyright Taylor and Francis Group, LLC.

The cost efficient expanded graphite (EG) filled polyetheretherketone (PEEK) nanocomposites were prepared by hot pressing, which exhibited an electrical conductivity percolation threshold of 1.5 wt%. The electrical conductivity of the 1.5 wt% nanocomposite increased approximately eleven orders of magnitude than that of pure PEEK. The conductivities of 5 wt% and 10 wt% nanocomposites were increased to about 3.24 S cm-1 and 12.3 S cm -1, respectively. Scanning electron microscope showed 3-dimensional conductive network of EG across the PEEK matrix. The significant increase in electrical conductivity of the nanocomposites leads to the tremendous increase in electromagnetic interference shielding effectiveness. © 2013 Elsevier B.V. All rights reserved.

Phadke S.B.,College of Engineering, Pune | Talole S.E.,College of Engineering, Pune
IEEE Transactions on Aerospace and Electronic Systems | Year: 2012

A novel formulation of sliding mode control (SMC) based proportional navigation (PN) guidance law is presented. Unlike conventional SMC-based guidance laws, the law presented here does not need any knowledge of bounds of target acceleration. The target acceleration is estimated using the so-called inertial delay control (IDC). Closed-loop stability for the guidance loop is established. Simulations are carried out by considering highly-maneuvering targets and constant as well as varying missile velocity and the results are presented to demonstrate the effectiveness of the proposed formulation. © 1965-2011 IEEE.

Goyal R.K.,College of Engineering, Pune | Yadav M.,College of Engineering, Pune
Journal of Applied Polymer Science | Year: 2013

The wear rate and coefficient of friction for graphite flake (GF)-filled polytetrafluoroethylene (PTFE) composites were evaluated on a pin-on-disk wear tester under dry conditions. Scanning electron microscopy showed significant reduction in the abrasive wear of the composites. The wear rates of 5 and 10 wt % GF composites were reduced by more than 22 and 245 times, respectively, at sliding speed of 1 m/s. With increasing sliding distance from 1 to 8 km, the wear rate of pure PTFE decreased by 1.4 times whereas that of composites, it decreased up to three times. The significant decreased in wear rate and coefficient of friction might be attributed to the formation of a thin and tenacious transfer film on the counter-surface. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 Copyright © 2012 Wiley Periodicals, Inc.

Pisal A.Y.,College of Engineering, Pune
International Journal of Advanced Structural Engineering | Year: 2015

The effectiveness of passive multiple-tuned mass friction dampers (P-MTMFDs) over a single passive-tuned mass friction damper (P-TMFD) is investigated. The governing differential equations of motion are solved numerically using state-space method. The response of a five-story structure is investigated for four considered earthquake ground motions. The number of P-TMFD units of P-MTMFDs is varied and the response of five-story structure with single P-TMFD is compared with the response of the same structure with P-MTMFDs. A parametric study is also conducted to investigate the effects of important parameters like number of P-TMFD units in P-MTMFDs, frequency spacing, mass ratio, tuning ratio and damper slip force. It is found that at a given level of excitation; an optimum value of considered important parameters exists at which the peak displacement of structure attains its minimum value. The response time history of the structure with single P-TMFD and P-MTMFDs, with respect to their optimum parameters is compared. It is found that the P-MTMFDs are more effective in controlling the response of the structure to which it is attached in compare to the single P-TMFD having same mass. © 2015, The Author(s).

Matekar S.B.,College of Engineering, Pune | Gogate G.R.,College of Engineering, Pune
Mechanism and Machine Theory | Year: 2012

This paper proposes a new error function that can be used for optimum synthesis of path generating mechanisms. The proposed error function is formulated in a way that makes it suitable for use in applications when the primary requirement is that the synthesized path should match closely with the prescribed path. The proposed error function is used in the optimum synthesis of four-bar mechanisms. The method of differential evolution is used to carry out the optimization. Results for three path synthesis problems are presented. Results obtained by using the proposed error function are compared with those obtained by using the commonly used cumulative squares of Euclidean distance error function, on the basis of the values of transverse and longitudinal errors between the prescribed and synthesized paths. The usefulness of the proposed error function is established on the basis of the comparative results. © 2012 Elsevier Ltd. All rights reserved.

Ginoya D.,College of Engineering, Pune | Shendge P.D.,College of Engineering, Pune | Phadke S.B.,College of Engineering, Pune
IEEE Transactions on Industrial Electronics | Year: 2014

This paper extends a recent result on sliding mode control for general $n$ th order systems with mismatched uncertainties. In this paper, a control is proposed to handle a larger class of mismatched uncertainties by extending the disturbance observer and modifying and generalizing the sliding surface. The practical stability of the overall system is proved and the results are verified by simulation of an illustrative example. © 2013 IEEE.

Singh A.R.,S.G.G.S.I.E.T | Dambhare S.S.,College of Engineering, Pune
International Journal of Electrical Power and Energy Systems | Year: 2013

In this paper, the analytical and simulation results of the application of adaptive distance protection scheme for the transmission line incorporating Static Var Compensator (SVC) connected at the mid-point is presented. The mal-operation of the distance protection for the transmission line with SVC at various locations are studied. The simulation results show the under-reaching and over-reaching is more severe with SVC at mid-point of the transmission line. To mitigate the mal-operation of the distance protection, the adaptive scheme is presented based on recursive simulation study. The simulation result with adaptive scheme is outperformed as compared with the conventional scheme. Electro-magnetic Transient Program (EMTP) simulations on two machine system is used to substantiate the claim. © 2013 Elsevier Ltd. All rights reserved.

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