[Retracted] Surface Feature Prediction Modeling and Parameter Optimization for Turning TC17 Titanium Alloy

Table 9

Comparison of the measured and predicted value.

No.	Surface roughness (Ra)					Surface microhardness (HV)
	Ra (μm) exp	RSM pred	ANN pred	Error (%) (RSM)	Error (%) (ANN)	HV (%) exp	RSM pred	ANN pred	Error (%) (RSM)	Error (%) (ANN)
1	1.36	1.4483	1.3414	6.49	1.37	455	480.1878	455.8414	5.54	0.18
2	0.79	0.7693	0.7919	2.62	0.24	435	443.4931	434.5498	1.95	0.10
3	1.28	1.4483	1.3414	13.15	4.80	460	480.1878	455.8414	4.39	0.90
4	0.7	0.8362	0.7289	19.45	4.12	438	503.8056	437.634	15.02	0.08
5	0.68	0.8842	0.6828	30.02	0.41	440	445.1016	439.8475	1.16	0.03
6	2.51	2.4843	2.6508	1.02	5.61	449	514.1188	447.0804	14.50	0.43
7	2.17	2.2372	1.9451	3.10	10.37	450	487.6745	461.8817	8.37	2.64
8	0.74	0.7629	0.7444	3.10	0.60	456	482.2466	455.3319	5.76	0.15
9	1.81	2.1177	1.8151	17.00	0.28	412	473.7475	410.6579	14.99	0.33
10	1.35	1.4221	1.3597	5.34	0.72	440	476.2698	454.162	8.24	3.22
11	1.32	1.4483	1.3414	9.72	1.62	458	480.1878	455.8414	4.84	0.47
12	1.2	1.4483	1.3414	20.69	11.78	449	480.1878	455.8414	6.95	1.52
13	0.83	0.9613	0.8347	15.82	0.57	421	487.6771	418.8745	15.84	0.50
14	1.58	1.5113	1.5847	4.35	0.30	426	440.0838	434.1304	3.31	1.91
15	1.37	1.5113	1.3815	10.31	0.84	420	484.2918	418.2745	15.31	0.41
16	2.32	2.4363	2.3226	5.01	0.11	480	484.4068	479.3656	0.92	0.13
17	1.45	1.4483	1.3414	0.12	7.49	452	480.1878	455.8414	6.24	0.85
18	1.53	1.5480	1.4374	1.17	6.05	468	495.6513	462.1011	5.91	1.26
19	1.21	1.4483	1.3414	19.69	10.86	448	480.1878	455.8414	7.18	1.75
20	2.27	2.3097	2.3047	1.75	1.53	426	429.5155	425.728	0.83	0.06
Average				9.50	3.48				7.36	0.85