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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.


Papers
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Proceedings ArticleDOI
01 Dec 2014
TL;DR: In this paper, the authors have discussed the optimization of the DC-DC converters of the 1-U Pico-satellite "Swayam", where a boost converter is used to step up solar panel voltage to regulated 5V and charge the battery pack.
Abstract: This paper discusses the optimization of the DC-DC Converters of 1-U Pico-satellite "Swayam". Swayam Satellite has two DC-DC Converters on-board. A Boost converter is used to step-up solar panel voltage to regulated 5V and charge the battery pack. A Buck converter is used to power all the active subsystems on the 3.3V bus. Special techniques and trade-offs ensure that both the converters perform optimally in the expected region of operation. Efficient system design has averted the requirement of Maximum Power Point Tracking (MPPT) algorithm and has greatly reduced system complexity. Apart from Space heritage and reliability, converter component selection, setting converter parameters such as switching frequency and printed circuit board (PCB) layout contributes to the overall system performance. Current-mode control in DC/DC Converters faces an inherent stability issue, leading to sub harmonic oscillations. The unstable mode of operation when the duty cycle exceeds 50% has been resolved by loop compensation techniques. When the EPS is powered up, the high current demands of the boost converter damage the module as well as the solar panels. A specially designed soft start technique helps in delaying the start-up of the converter, thus snubbing the current overshoots. A perfect jitter-free gate drive minimizes the switching noise generated by the DC/DC converter. Moreover, component layout and changing loop areas in converters, ground returns, ground bounce and star connections ensure superior performance. The design accounts for system engineering factors like size and mass constraints as well as providing a magnetically clean environment for any sensitive payloads of the satellite. The DC/DC converters of Swayam satellite have been designed to cater to the power demands of a small satellite profile.

10 citations

Proceedings ArticleDOI
01 Mar 2016
TL;DR: This paper concentrates on the components of versatile and adaptable parallel file system framework named Lustre, and implementation work of innovative scalable file system is been presents which solves many research Questions and space in file system research domain.
Abstract: File System is Data-Structure with Logic (method) to handle efficiently a group of information on disk. File systems come are classified according to their structure method of operation, speed of operation, scalability and flexibility size and security. A file system framework is an intends to sort out data anticipated that would be retained after a program terminates by giving methodology to store, retrieve and update information, and also deal with the accessible space on the device(s) which contain it. A file system framework sorts out information in a proficient way and is tuned to the particular attributes of the device. Individual device partitions can be setup utilizing one of the wide ranges of file systems. Each has its own particular features, impediments, and unique characteristics. This paper concentrates on the components of versatile and adaptable parallel file system framework named Lustre. A null hypothesis work has been presented on Luster file system which is a step in HPC(high performance computing). The hypothesis accepts research scope from survey of articles from various portals and presents in better approach developed by our team in research domain of file system to handle issues and built a better scalable file system like luster. A sequential survey analysis has been done on file system for articles from last three decades in File system research. The research scope unwrapped by scholars is been highlighted in this article and implementation work of innovative scalable file system is been presents which solves many research Questions and space in file system research domain. Performance evaluation helps in assisting File system in current scenario. A systematic literature survey has been incorporated in manuscript for finding research directions. Twenty research articles have ben breakdown in abstract methodology and research scope to find in challenges and subsequent methods to overcome those challenges.

10 citations

Journal ArticleDOI
TL;DR: FMEA methodology is used to analyze the risk involved in the operation of CNC turning centers to identify critical failure modes, components and sub-systems and results are useful for system reliability improvement and optimizing maintenance.
Abstract: The intensity growth of manufacturing industry in India is increasing the demand of CNC turning centers. The producers of CNC turning centers are trying to fulfil this demand. The quality and reliability of such CNC turning centers is critical for manufacturers and users to meet the market demand. In this context, it is required to identify the potential failures and minimize their occurrence probability. Failure modes and effects analysis (FMEA) is a robust methodology used to study the risk and reliability of various systems. In this paper, FMEA methodology is used to analyze the risk involved in the operation of CNC turning centers. The objective of the analysis was to identify critical failure modes, components and sub-systems. The study uses field failure data from more than 50 CNC turning centers and more than five industrial experts. FMEA results are further compared to the failure rates obtained from the field failure data. The results of the FMEA analysis are useful for system reliability improvement and optimizing maintenance. Electrical and electronic components have higher failure rates compared to mechanical components. CNCS, MT, XZAS, HS, ChS and SS are found to be critical sub-systems.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed the use of waste pomegranate fruits as a source for production of second-generation ethanol if after treatments be performed to reduce NOx emissions.
Abstract: Fossil fuel depletion and strict government regulations have necessitated the finding of alternatives to conventional fuel sources. The growing population and better transport are increasing the need for energy every day. The pollution and disposal of agriculture and food waste are still serious problems to be tackled. Bioethanol has proved an alternative to S.I. engine diesel and gasoline. 10% ethanol blending is widely used by passenger cars worldwide and countries such as India have announced the implementation of a 20% ethanol blending in petrol. As a result, demand for ethanol is growing and there is inadequate bioethanol supply to meet demand. This paper portrays the extraction of ethanol from the waste pomegranate fruits and effect of its different blends on the spark ignited engine performance. Ethanol was extracted using fermentation and steam distillation processes from waste pomegranate fruit. Four blends were prepared on volumetric basis and tested for various performance and emission parameters at a constant compression ratio of 10:1 and wide-open throttle at various engine speeds. Indicated power, volumetric efficiency, and mechanical efficiency were improved by ethanol enrichment. Enrichments of ethanol decrease emissions of HC, CO and CO2, however increase nitrogen oxide emissions. The engine performance was found optimal for WPFE15 among all fuel blend studied. This study recommends the use of waste pomegranate fruits as a source for production of second-generation ethanol if after treatments be performed to reduce NOx emissions. This study proposes the use of waste pomegranate fruits for second-generation ethanol processing, if NOx pollution after treatment is carried out.

10 citations

Proceedings ArticleDOI
13 Oct 2014
TL;DR: In this paper, the design, fabrication and characterization of 32nm HfO 2 /TiSi 2 PMOS device is presented; replacing the conventional SiO 2 dielectric and Poly-Silicon.
Abstract: The evolution of MOSFET technology has been governed solely by device scaling, delivered an ever-increasing transistor density through Moore's Law. In this paper, the design, fabrication and characterization of 32nm HfO 2 /TiSi 2 PMOS device is presented; replacing the conventional SiO 2 dielectric and Poly-Silicon. The fabrication and simulation of PMOS transistor is performed via Virtual Wafer Fabrication (VWF) Silvaco TCAD Tools namely ATHENA and ATLAS. Taguchi L9 Orthogonal method is then applied to this experiment for optimization of threshold voltage (V TH ) and leakage current (I OFF ). The simulation result shows that the optimal value of V TH and I OFF which are 0.1030075V and 3.4264075×10−12A/um respectively are well within ITRS prediction.

10 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202227
2021491
2020323
2019325
2018373
2017334