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Table 5.

Comparison of RSM-predicted, ANN predicted and experimental results at RSM-based optimal parametric setting.

Expt. Experimental results RSM predicted results ANN predicted results Percentage of prediction error in RSM approach Percentage of prediction error in ANN approach
Nearer feasible setting of RSM predicted optimal parametric setting Surface roughness, Ra = 5.91 µm Surface roughness, Ra = 5.63 µm Surface roughness, Ra = 5.72 µm 4.74 3.21
(Avg. power = 7.81 watt; Pulse Freq. = 5600 Hz; Rotating sp. = 436 rpm; Air press. = 0.30 kg-cm−2; Y feed rate = 0.443 mm/s) Turning depth deviation = 0.00021 mm Turning depth deviation = −0.00020 mm Turning depth deviation = 0.000203 mm 4.76 3.33

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