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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Phalke T.P.,College of Engineering, Pune | Mitra A.C.,College of Engineering, Pune
Materials Today: Proceedings | Year: 2017

Automobile industry is striving for improvement in design and to provide high speed vehicles with passenger comfort. Riders comfortbecomes a very important issue for new developed modern vehicles. Quarter-car model is being used for years to study the car dynamics.The present work is carried out to investigate performance of vehicles in terms ride comfort and road holding. Analysis of the dynamic response of ride performance and road holding is carried out using a two degree of freedom system quarter-car model. The equations of system are solved by MATLAB SIMULINK that used to analyses behaviour of system and find out effect damping coefficient, stiffness, sprung mass and velocity on ride comfort and road holding. © 2017 Published by Elsevier B.V.

Nalawade R.,College of Engineering, Pune
SAE Technical Papers | Year: 2017

The exhaust system of a vehicle is an integral part as it is responsible for reducing the noise of the exhaust gases and controlling the emissions as well. Mufflers are particularly the sub part of an exhaust system that reduce the sound level. Their geometry and size are meticulously calculated and decided so as to increase destructive interference of sound waves and their absorption by sound absorbent material packed around it. There are five types of basic mufflers which will be compared for their transmission losses. For this analysis of transmission losses, a software called Ricardo Wave Build has been used. Transmission loss is basically, the difference between the energy of the incoming charge and the energy of the outgoing charge of gases. So, more is the transmission loss, more efficient and productive is the muffler. Based upon the transmission loss characteristics, the mufflers are paired with their corresponding applications. Along with this, the concept of a resonating column is discussed. This is basically a chamber which helps in reducing sound by destructive interference and also promotes scavenging effect. The installation and its effect on transmission loss characteristics are observed. The feasibility and scope of the resonating chamber are further seen. It is seen that the resonating chamber gives positive results and is comparatively a simple addition to the muffler component of the exhaust system. All the types of mufflers are then combined with the resonating chamber and a table is constructed, comparing the transmission losses of all the mufflers depicted earlier. Copyright © 2017 SAE International and Copyright © 2017 SAE INDIA.

Badkas S.A.,College of Engineering, Pune | Ajmera N.,College of Engineering, Pune
International Journal of Mechanical Engineering and Technology | Year: 2016

Gear is the one of the important machine element in the mechanical power transmission system. Spur gear is most basic gear used to transmit power between parallel shafts. Spur gear generally fails by bending failure or contact failure. This paper analyses the bending stresses characteristics of an involute spur gear tooth under static loading conditions. The tooth profile is generated using Catia and the analysis is carried out by Finite element method using ANSYS software. The stresses at the tooth root are evaluated analytically using existing theoretical models. The theoretical and FEM results are compared. The results obtained theoretically are in good agreement with those obtained from software. Also an attempt is made to introduce Stress and displacement characteristics of tooth under dynamic loading conditions. © IAEME Publication.

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.

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.

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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