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.

Ruggedisation methodologies for GPS based Vehicle Tracking System

Abstract: Main objective of this research proposal is to develop ruggedised strategic GPS based Vehicle Tracking System (VTS). For ruggedisation, system needs to be tested for specifications according to the different standards such as JSS-55555 / MIL-STD-810E (Environmental) and MIL-STD-461E (EMI/EMC). This paper gives brief survey of strategic testing procedures, typical severities of the tests, and probable failures/damages in the electronics / communication systems /circuits. The tests include Environmental, Dynamic, Corrosion, Mould growth, Radiated / Conducted Emission and Susceptibility, ESS and Burn-in, etc. This paper also explains the effect of all these tests on the equipment leading to probable damages/failures in the system for which cognizance must be taken in the design for improvement of reliability of the equipment to make the equipment compatible with stringent requirements. The outcome of these tests may be probable damages like failure of semiconductor devices and components, destruction of electronic circuits, breakage of PCB, damages in the enclosures, drift in the specifications / parameters, functional impairments, malfunctioning of the equipment, etc. The brief methodologies of ruggedisation such as selection of MIL grade components, use of shock mounts, specialized enclosure design, balanced mechanical layout, and use of protective coatings are recommended. These methodologies are useful to ensure the compatibility of GPS based Vehicle Tracking System with different standards like JSS-55555 / MIL-810E (Environmental).

Microstructural Characterization and High Strain Rate Plastic Flow Behavior of SMAW Armox500T Steel Joints from Spherical Indentation Experiments

Abstract: Static indentation and uniaxial compression tests have been conducted on Armox500T steel and its weldments to predict the constraint factor (CF), i.e., ratio of Meyer’s hardness to uniaxial flow stress. Series of dynamic indentation experiments were carried out at impact velocities ranging from 5 to 300 m/s to estimate dynamic hardness as a function of average strain. Subsequently, dynamic indentation (DI) test data and CF determined under static indentation conditions have been used to study the high strain rate plastic flow behavior of Armox500T weldments in comparison with the base metal. It was observed that flow stress for Armox500T and its weldments under dynamic loading conditions (104 s−1) are significantly higher than flow stress measured under static loading conditions (10−3 s−1). The plastic flow behavior computed from DI is in good agreement with the data evaluated through conventional split Hopkinson pressure bar technique. Further, the study of the microstructure of base metal and weldments by optical microscopy and SEM revealed a considerable variation in the microstructure.

Assessment of municipal solid waste management system in Lae City, Papua New Guinea in the context of sustainable development.

Abstract: Lae City (LC) of Morobe Province is the second-largest city in Papua New Guinea. Due to the abundant natural resources it inherits, the resultant urbanization has led to an influx of the human population. This increase in population as a result of industrialization has led to increased municipal solid waste (MSW) accumulation. To address this exigent issue, which affects the nation’s carbon footprint, it is imperative to review socio-economic and geographic factors to establish a feasible approach for managing MSW efficiently and sustainably. In the quest to achieve the same, the present assessment focuses on the 3 core waste management hierarchy systems to support sustainable development for LC by reviewing existing opportunities and challenges associated with the current MSW management system and the associated policies. The result shows that as a sustainable approach to MSW management of LC, a zero-waste campaign for resource recovery engaging all stakeholders can be implemented since the organic content of MSW generated in LC is as high as 70%. Moreover, the dumping of MSW at the dedicated dumpsite site can be minimized if policies are strengthened and the proposed waste avoidance pathway is implemented strictly. In addition to this, to avoid the contamination of groundwater and recovery of methane, the use of the Fukuoka approach in the existing landfills has been suggested to capture leachate without any huge expenditure.

Entropy analysis for identifying significant parameters for seismic soil liquefaction

Abstract: A novel application of multi-criteria decision making (MCDM) technique to seismic soil liquefaction, a complex problem in earthquake geotechnical engineering, is presented. Seismic soil liquefaction depends on a diversified set of physical parameters with highly non-linear interconnections. Factors governing liquefaction may broadly be grouped as seismic parameters, site conditions and primarily dynamic soil properties, as the stimulus itself is manifestly dynamic. Each of these factors incorporates a wide range of variety of parameters that characterize liquefaction, to a varying degree of significance, such as: the magnitude, effective overburden pressure, shear modulus, normalized standard penetration blow count [N1]60, etc. Estimating rapid, yet accurate and reliable liquefaction susceptibility requires identification of the most significant factors controlling liquefaction. Thus a new concept of extracting significant parameters and gauging their importance is carried out by assigning them weights by...

Influence of Tertiary Carbides on Improving Fatigue Limit of H13 Die Steels

Abstract: Forging dies are subjected to fatigue failures for which different surface treatments are used as most of the failures begin from the surface. In this work, the influence of cryogenic treatment on fatigue limit of die steels has been discussed with hardening of fatigue specimens of AISI H13 die steels at 1020 °C, oil quenching, double tempering at 500 °C, cryogenic treatment at minus 185 °C for 16 h followed by soft tempering at 100 °C. The fatigue limit analysis had been carried out with constant amplitude rotating bending fatigue testing at room temperature, at 3000 rpm with load variations which indicated improved fatigue limit for 16 h cryogenically treated specimens in the high cycle fatigue regime. This has been attributed to decreased surface roughness, increased hardness and precipitation of finer tertiary carbides as an influence of microstructure. The minimum value of fatigue strength exponent, in Basquin equation, has also depicted the increased fatigue limit for cryogenically treated H13 specimens.