Abstract
The aim of the research is to select the best experimental setup and optimal process parameters of EDM process. Mathematical models are developed combining ENTROPY-COPRAS methodologies with ENTROPY-TOPSIS methodologies to solve a multi-response parameter optimization problem. Initially, ENTROPY method is used to calculate the weights on the output parameters of the experimented result. Thereafter, preference value of each parameter influences the decision matrix. Finally, COPRAS and TOPSIS are used to calculate the rank of the experiment performed for optimal process parameter analysis. The result shows that experiment no. 5 is the optimal experimental setup, and corresponding values of the output parameters are peak current of 4.5 A, pulse duration of 261 µs, dielectric level of 80 mm and flushing pressure of 0.3 kg/cm2 according to COPRAS method, and using TOPSIS method, it revealed that experiment no. 6 is the optimal experimental setup with the corresponding optimized values as peak current of 4.5 A, pulse duration of 520 µs, dielectric level of 40 mm and flushing pressure of 0.5 kg/cm2.
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