College of Engineering, Pune

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

Observer-Based Sliding Mode Control for a Class of Noncommensurate Fractional-Order Systems

Abstract: This paper investigates an application of fractional theory for control and state estimation for a class of noncommensurate systems. A single-link flexible manipulator is considered as a representative example of this class of second-order underactuated systems. A fractional model is proposed and validated experimentally. The fractional-order sliding mode control is synthesized using a novel stable fractional surface. A fractional sliding mode observer is designed for state estimation necessary for implementing the control. The proposed method is validated through simulation and experimentation both.

IoT based solid waste management system for smart city

Abstract: Today, waste management from its inception to its disposal is one of the important challenges for the municipal corporations in all over the world. Dust bins placed across cities set at open places are flooding because of increment in the waste each day and making unhygienic condition for the citizens, to maintain a strategic distance from such a circumstance we have proposed wireless solid waste management system for smart cities which allows municipal corporations to monitor status of dustbins remotely over web server and keep cities clean very efficiently by optimizing cost and time required for it. As soon as dustbin has reached its maximum level, waste management department gets alert via SMS via gsm module placed at dustbin so department can send waste collector vehicle to respective location to collect garbage. The objective of the project is to enhance practicality of IoT based solid waste collection and management system for smart city.

Flow around six in-line square cylinders

Abstract: The flow around six in-line square cylinders has been studied numerically and experimentally for and , where is the surface-to-surface distance between two cylinders, is the size of the cylinder and is the Reynolds number The effect of spacing on the flow regimes is initially studied numerically at for which a synchronous flow regime is observed for , while quasi-periodic-I, quasi-periodic-II and chaotic regimes occur between , and , respectively These regimes have been confirmed via particle-image-velocimetry-based experiments A flow regime map is proposed as a function of spacing and Reynolds number The flow is predominantly quasi-periodic-II or chaotic at higher Reynolds numbers The quasi-periodic and chaotic nature of the flow is due to the wake interference effect of the upstream cylinders which becomes more severe at higher Reynolds numbers The appearance of flow regimes is opposite to that for a row of cylinders The Strouhal number for vortex shedding is the same for all the cylinders, especially for synchronous and quasi-periodic-I flow regimes The mean drag () experienced by the cylinders is less than that for an isolated cylinder, irrespective of the spacing The first cylinder is relatively insensitive to the presence of downstream cylinders and the is almost constant at 12 The for the second and third cylinders may be negative, with the value of increasing monotonically with spacing The changes in root mean square lift coefficient are consistent with changes in Interestingly, the instantaneous lift force can be larger than the instantaneous drag force on the cylinders These results should help improve understanding of flow around multiple bluff bodies

Taguchi analysis of surface modification technique using W-Cu powder metallurgy sintered tools in EDM and characterization of the deposited layer

Abstract: The present study describes an experimental research on surface modification during electrical discharge machining (EDM) by depositing a hard layer over the work surface of C-40 grade plain carbon steel using specially prepared powder metallurgy compact tools The investigated process parameters were composition, compaction pressure, sintering temperature, pulse on-time, peak–current setting, and duty factor Measurements of deposited layer thickness, mass transfer rate, tool wear rate, surface roughness and microhardness were undertaken on the EDM-ed specimens Different studies like X-ray diffraction, optical microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy were carried out to ascertain the characteristics of the deposited layer on the work surface These analyses confirmed the presence of the tool materials in the work surface layer At first, an L-16 orthogonal array was applied as Taguchi DOE technique and the ANOVA was done to study the effects of pertinent process parameters An optimum condition was achieved using overall evaluation criteria Later on, a detailed study was carried out to get a smooth and regular deposition of material The characterization of the deposited layer is presented The deposited layer with a wide range of average layer thickness of 3–785 μm, enriched with tool materials (W and Cu) and with the formation of tungsten carbide, and having microhardness of 981–1275 GPa at the hardest zone was successfully deposited over the work surface

Security Issues in IIoT: A Comprehensive Survey of Attacks on IIoT and Its Countermeasures

Abstract: Industrial Internet of Things (IIoT) applications connect machines, sensors and actuators in high-stake manufacturing industries. Industrial systems are using the potential of IoT to reduce the unnecessary operational cost and increase the usability and reliability of the industrial assets to achieve more profits. However, such smart Industries need connectivity and interoperability to enhance performance which makes them susceptible to various attacks. Recent attacks on Cyber-physical systems raise a strong security concern as such attacks causes a huge property loss and may also lead to life threatening situations. In this paper we discuss the potential security threats to the Industries adapting to IIoT and study the various attacks that are possible on the components in the layered IIoT architecture and some of the preventive measures. Finally, we propose IIoT attack taxonomy which would help in mitigating the risks of the attacks.