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.

Theoretical and experimental study for identification of crack in cantilever beam by measurement of natural frequencies

Abstract: Most of the rotating machines used in process industries or in manufacturing plant need maintenance and repair. However, failure of just one of these machines can disturb an entire process with losses in terms of production, manpower, and equipment repair or replacement. Also failure of a single machine component in process industries like petrochemicals or power stations can result in the loss of millions of rupees per down time hour. These facts together with higher costs for new equipment have placed increased demand on plant maintenance to keep existing equipment operating efficiently with higher availability. A number of non-destructive crack detection techniques have been developed, such as ultrasonic testing, X-ray technique, magnetic particle method etc. Every method has some advantages and disadvantages. In recent years, ultrasonic testing has gained greater attention for monitoring the cracks in structures and machine components. Most of these methods are very laborious and time consuming, in th...

A Threshold Band Based Model for Automatic Load Balancing in Cloud Environment

Abstract: Virtualization technology used in Cloud computing shares the underlying hardware and provides computing resources through virtual machines (VM). VMs provide isolation among different operating systems.Resource utilization could be improved by balancing the loads on the cluster which can be achieved through dynamic migrations of virtual machines wherever desirable.Manual load balancing becomes very tedious, since an administrator has to continuously monitor the system to determine which VMs to be migrated across the cluster.Maximum resource utilization can be achieved using Automatic load balancing across the cluster by doing dynamic migrations of virtual machines. It is very important in such migrations of VMs to decide when to move which VM to what physical machine. Random or naive migrations may result into degradation in overall performance of the cluster. The proposed solution involves a model which dynamically determines overloaded hosts and chooses the best VM and destination host for migration to achieve better load balanced environment.

PEEK/SiO 2 composites with high thermal stability for electronic applications

Abstract: Thermal and mechanical properties of new high performance polymer matrix composites based on poly(etheretherketone) (PEEK) as matrix and crystalline-silica (SiO2) as reinforcement were discussed for application in electronic packaging substrates or printed circuit boards. The content of SiO2 was varied between 0 and 50 wt. %. Scanning electron microscopy showed uniform dispersion of SiO2 particles in the matrix. Thermogravimetry analysis showed significant increase in thermal stability and char yield with increase in SiO2 content in the matrix. Differential scanning calorimetry showed that SiO2 had a heterogeneous nucleating effect on PEEK, leading to an increase in peak temperature of crystallization and onset crystallization temperature of the composites compared to a pure matrix. The microhardness increased approximately 42%. A modified rule of mixtures with a strengthening efficiency factor equal to 0.06 fit the data nicely. The results show that the prepared PEEK/SiO2 composites may have potential applications in electronics.

Output feedback control of flexible link manipulator using sliding modes

Abstract: Control of flexible link manipulators poses a challenge due to flexible modes This paper presents output feedback control for positioning a tip of flexible link manipulator(FLM) using sliding modes Sliding mode observer(SMO) is designed for estimation of system states Output estimation error becomes zero in finite time due to sliding modes The SMC with SMO is designed for positioning a tip of FLM The method is validated in simulation and experiment both

Evaluation of the Permeability Behaviour of Sand-Bentonite Mixtures Through Laboratory Tests

Abstract: In recent years, when suitable impervious soils are not available for containing the waste, barriers constructed using sand-bentonite mixtures are being frequently adopted to contain the waste. This paper presents the laboratory evaluation of permeability of sand-bentonite mixtures through falling head tests performed with rigid wall permeameter and oedometer on different categories of sand-bentonite mixtures. Five different categories of sand-bentonite mixtures were formulated by varying bentonite content in increments of 5 % from 5 to 25 % by dry weight. Atterberg limits and compaction characteristics of sand-bentonite mixtures were evaluated. With an increase in bentonite content, the unconfined compressive strength of the sand-bentonite mixture was found to increase linearly and a sharp decrease in permeability was registered up to a bentonite content of 15 % and beyond this the decrease in the permeability was marginal. Permeability tests were carried out with and without prior saturation of the samples. It was found that permeability behavior of sand-bentonite mixtures was affected by the initial saturation process and type of permeability testing method.