College of Engineering, Pune

About: College of Engineering, Pune is a based out in . It is known for research contribution in the topics: Sliding mode control & Control theory. The organization has 4264 authors who have published 3492 publications receiving 19371 citations. The organization is also known as: COEP.

Validation of Capacitance and Equivalent Series Resistance Model of Manganese Oxide-based Aqueous Super-capacitor

Abstract: Electrical energy storage is a critical parameter in many advanced electric vehicles. Conventional batteries provide limited solution in this regard. Development of a battery compatible super-capacitor can give a good hybrid energy storage system consisting of a battery and super-capacitor. An aqueous metal oxide super-capacitor is voltage compatible with a conventional battery. Advances are required in improving both the energy and power density of this super-capacitor through a new electrode, electrolyte materials, and issues related to the construction of the device. Modeling with electrical parameters as an output and electrode/ electrolyte parameters as an input can be very effective in developing a low-cost super-capacitor. Electrode construction and material play important roles in its performance; these two aspects have been addressed in this article through a modeling approach to convert a manganese oxide-based aqueous super-capacitor into a cost-effective product. New super-capacitor st...

Experimental study of CFRP patches bonded on a cracked aluminum alloy panel

Abstract: An experimental study was conducted to arrest a crack in 1.0-mm-thick 6061-T6 aluminum single-edge-notch tension specimen. The specimen was repaired by symmetrical bonding of carbon fiber-reinforce...

Combination of Symbolic and Statistical Features for Symbols Recognition

Abstract: In this article, we have tried to explore a new hybrid approach which well integrates the advantages of structural and statistical approaches and avoids their weaknesses. In the proposed approach, the graphic symbols are first segmented into high-level primitive like quadrilaterals. Then, a graph is built by utilizing these quadrilaterals as nodes and their spatial relationships as edges. Additional information like relative length of the quadrilaterals and their relative angles with neighbouring quadrilaterals are associated as attributes to the nodes and edges of the graph respectively. However, the observed graphs are subject to deformations due to noise and/or vectorial distortion (in case of hand-drawn images) hence differs somewhat from their ideal models by either missing or extra nodes and edges appearance. Therefore, we propose a method that computes a measure of similarity between two given graphs instead of looking for exact isomorphism. The approach is based on comparing feature vectors extracted from the graphs. The idea is to use features that can be quickly computed from a graph on the one hand, but are, on the other hand, effective in discriminating between the various graphs in the database. The nearest neighbour rule is used as a classifier due to its simplicity and good behaviour

Secure Phase Comparison Schemes for Transmission-Line Protection Using Synchrophasors

Abstract: The segregated phase comparison technique is a notable form of differential protection which compares the phase angle of end currents of a transmission line. The literature shows that phase differential protection serves as a better option for transmission-line protection due to its simplicity, sensitivity, selectivity and comprehensibility. However, line-charging current causes a significant error in the phase angle of two end currents of a transmission line. This paper presents improved phase comparison which compensates error due to line-charging current and a function of a cosine scheme using the equivalent- $\pi$ model of the transmission line. The phase differential function is developed using phase coordinates. The scheme is compared with the existing scheme like, conventional scheme based on line currents, the positive-sequence component of line currents and a mixed combination of line currents. The global positioning system is used for time-synchronised measurements and fiber optics are considered for data communication. Simulations are carried out in an Alternate Transients Program/Electromagnetic Transients Program on an IEEE 14-bus system, and a protection scheme is implemented on one of the tie lines. The results demonstrate the accuracy of the proposed approach over the existing schemes.