Table 11.

Statistical result for tapered roller bearing

Bearing number	Optimization method	Best	Mean	Worst	STD
32207	HHO	68,199.43	50,422.74	42,447.67	8681.153
	Cha-HHO	66,916.79	48,827.31	44,035.26	7836.42
	Gau-HHO	62,472.2	55,858.61	52,381.36	3833.961
	CLS-HHO	58,549.38	51,582.96	34,497.03	9443.249
	Cha-Gau-CLS-HHO	63,363.86	54,171.72	45,688.48	5623.82
	DE-Pol-HHO	72,777.02	69,517.8	65,042.16	2953.21
	Cha-DE-Pol-HHO	74,132.74	69,715.49	65,524.29	2753.776
	Gau-DE-Pol-HHO	76,651.93	73,863.27	65,384.35	3386.548
	CLS-DE-Pol-HHO	73,378.96	68,353.78	62,805.36	3852.129
	EHHO	77,091.46	75,709.29	73,063.19	1264.924
30307	HHO	62,170.57	45,428.87	39,287.2	8619.527
	Cha-HHO	74,761.57	53,460.88	49,441.91	8823.459
	Gau-HHO	65,172.04	57,959.72	50,047.24	3569.721
	CLS-HHO	66,477.57	57,054.35	56,007.32	3310.984
	Cha-Gau-CLS-HHO	77,002.43	59,512.23	53,099.14	9651.839
	DE-Pol-HHO	79,627.92	71,732.16	46,078.51	10,340.03
	Cha-DE-Pol-HHO	81,008.2	76,080.66	68,414.83	4466.655
	Gau-DE-Pol-HHO	81,417.25	76,767.38	59,460.96	6366.401
	CLS-DE-Pol-HHO	81,663.6	74,097.82	70,330.55	3768.046
	EHHO	83,036.86	78,970.02	75,167.9	2782.379
32208	HHO	73,873.29	56,993.26	42,935.66	8777.11
	Cha-HHO	74,331.65	57,761.36	54,570.15	6962.738
	Gau-HHO	70,593.91	60,848.55	55,732.52	6369.845
	CLS-HHO	68,139.23	59,715.36	46,030.73	7312.302
	Cha-Gau-CLS-HHO	71,781.09	67,488.67	65,621.82	1777.807
	DE-Pol-HHO	83,381.08	77,385.17	70,067.29	4811.884
	Cha-DE-Pol-HHO	85,393.4	78,315.92	68,618.12	6102.392
	Gau-DE-Pol-HHO	85,506.08	83,351.81	78,067.71	2574.536
	CLS-DE-Pol-HHO	84,901.93	76,804.31	66,011.37	5429.324
	EHHO	86,603.7	84,233.2	80,135.14	2476.326

Bold values indicate the best results