Simultaneous Optimization of Roughness Parameters using TOPSIS

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2017 by IJETT Journal
Volume-49 Number-3
Year of Publication : 2017
Authors : Ch. Maheswara Rao, S. Srikanth, R. Vara Prasad, G. Babji


Ch. Maheswara Rao, S. Srikanth, R. Vara Prasad, G. Babji "Simultaneous Optimization of Roughness Parameters using TOPSIS", International Journal of Engineering Trends and Technology (IJETT), V49(3),150-157 July 2017. ISSN:2231-5381. published by seventh sense research group

The present work is to explore the effect of EDM process parameters on the surface roughness characteristics Ra, Rq and Rz. For the experimentation, twenty seven alternatives of EDM process parameters, Pulse on time (TON), Pulse off time (TOFF), Wire Tension (WT) and Wire Feed (WF) were considered as per the Taguchi’s standard L27 Orthogonal Array. The Roughness characteristics of Arithmetic average (Ra), Geometric average (or) RMS value (Rq) and Ten point height average (Rz) were considered as the experimental responses. Multi-criterion decision making method, TOPSIS has been employed for the optimization of responses simultaneously. From the TOPSIS and main effect plots for Signal-to-Noise ratios of the relative closeness coefficient (Ci+), the optimal combination of the multi responses was found at twenty second alternative, i.e. Pulse on time (TON): 131μs, Pulse off time (TOFF): 58μs, Wire Tension (WT): 2 Kgf and Wire Feed (WF): 4 m/sec. Analysis of variance (ANOVA) was applied using the MINITAB-16 software to know the influence of EDM process parameters on the relative closeness coefficient (Ci+). From the results of ANOVA, it is clear that, Wire Feed (WF) has high influence (F = 30.38) and Pulse off time (TOFF) has low influence (F = 1.00) in affecting the multi-responses.


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Arithmetic Average Roughness (Ra), Geometric Average Roughness (Rq), Ten Point Height Average Roughness (Rz), TOPSIS and ANOVA.