Selection of optimal processing condition is an issue associate with multi-criteria decision making (MCDM) which can be influenced by several conflicting processing variables. The present study have been devoted to the implementation of TOPSIS algorithm in coordination with the VIKOR technique to yield an optimistic processing criteria while machining of metal matrix composites under electro-discharge machining process. A decision-making module has been developed for selection of optimum processing conditions under specified machining conditions. An experimental investigation was performed based on Taguchi’s orthogonal array on the newly prepared AA6061-cenosphere MMCs to analyze the sensitivity of EDM attributes to the process parameters such as peak current, pulse on time, the percentage of reinforcement, and flushing pressure. The weighing factors for the criteria were determined using AHP method. The results concluded that both the applied MCDM approaches, TOPSIS and VIKOR accrue the similar possible optimal solution having optimal value of pulse current 10 A, pulse on time 1010 µs, percentage of reinforcement as 2% and flushing pressure as 0.6 MPa.

Common Rail Direct Engine (CRDI) engines are used for transportation and other sectors due to their high fuel conversion efficiencies. Waste plastic pyrolysis oil can be a substitute to the depleting petroleum reserves. Plastic oils are durable and takes longer time to degrade because of stronger molecular bonds and it repel to natural processes of degradation. This investigation deals with the effect of increasing the fuel blend ratio and with increasing the fuel injection pressures on single cylinder, CRDI diesel engine using plastic oil and diesel blend. The fuel blend varies from 5:95%, 10:90% and 15:85% (Plastic pyrolysis oil and diesel) respectively with various fuel injection pressures of 400 bar, 500 bar and 600 bar. The emission, performance and combustion characteristics were evaluated and analyzed in this work. Plastic oil blends were able to operate in diesel engines without any engine modifications. The results shows the brake thermal efficiency increases with the increasing fuel injection pressure. The engine with the fuel injection pressure of 600 bar gives better brake thermal efficiency at the full load condition for the 15PDB fuel blend. Hence it was concluded that the increasing the pressure, increases the performance and decreases the emissions.

Proper selection of manufacturing conditions is one of the most important aspects to take into consideration in the majority of manufacturing processes and, particularly, in processes related to Electrical Discharge Machining (EDM). These are the conditions that determine important characteristics such as material removal rate, Electrode Wear. In the present work experiments are conducted on EDM using Al6061+SiC (with 3%,6%,9% composition of SiC in Al 6061 Alloy ),Copper and Brass materials as electrodes and EN8 steel as work material. Discharge current (IP), pulse on time (TON), pulse off time (TOFF) are selected as inout process parameters, Metal Removal Rate (MR), Tool Wear Rate (TWR) as response. Taguchi design of experiment is used to find the influence of process parameters on response and a mathematical model is developed. Percentage contribution of each factor is determined.

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