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Joseph A.,Albertian Institute of Science and Technology AISAT | Thampi G.K.,Cochin University of Science and Technology
FME Transactions

Engine knocking acts as an obstruction for improving the engine performance, hence limiting the compression ratio below the highest usable compression ratio (HUCR). Even though the design condition is kept much below HUCR, knocking occurs during the long-running conditions due to the reduction in the heat carrying capacity of the coolant. The present study focuses on the prediction of knocking from the acoustic signals produced by the engine using Wavelet theory. Thermodynamic modelling of the spark ignition engine is done to analyse the performance enhancement that could be achieved by increasing the amount of cooled exhaust gas recirculation (EGR). During the occurrence of knocking, cooled exhaust gas is recirculated to control the in-cylinder temperature and hence the knocking. In addition to the reduction in temperature, the analysis shows that the thermal efficiency of the engine has increased about 12% with the cooled EGR. © Faculty of Mechanical Engineering, Belgrade. Source

Geo C.J.,Government Engineering College at Thrissur | Nair P.P.,Government Engineering College at Thrissur | George K.E.,Albertian Institute of Science and Technology AISAT
International Journal of ChemTech Research

Wastepolystyrene (Thermocol) was modified with rubber and nano clay by using two separate blending technique. In the first method polystyrene was dissolved in toluene, the rubber was added to the solute and finally nanoclay was added. In the second method nanoclay was added to rubber and the compound was added to polystyrene solution. The study shows that the first method result in better nanofillers dispersion and hence mechanical properties. Source

Wilson B.,Albertian Institute of Science and Technology AISAT
Proceedings - 2015 5th International Conference on Advances in Computing and Communications, ICACC 2015

MANET (Mobile Ad Hoc Network) consists of mobile nodes having no fixed infrastructure. These networks have dynamic topology and all the nodes are in general autonomous. Normally network comprises of selfish individuals that are not willing to forward the packets but wants to forward their own messages. In ad hoc network throughput increases when all available nodes are used for routing and forwarding. So instead of avoiding selfish nodes from the routing path the network can effectively utilize all the existing nodes. In this research, selfishness of the nodes is studied and better security methods are proposed to ensure reliable delivery of messages. Simulation results shows that the proposed system ensures less message overhead, memory and time. Also it tries to improve the packet delivery ratio. © 2015 IEEE. Source

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