Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Table 4

Comparison of the optimized solution and random solutions under allowable film thickness of ℎ_𝑎=3.0×10⁻⁶ (m).

Case	Obj. f(X) (N/m)	𝜑1 (deg)	𝜑2 (deg)	𝜑3 (deg)	𝜑4 (deg)	𝑁	𝑟𝑠	ℎ𝑔 (m)	𝛼
Optimum solution	1.89×10^6	4.46	−11.2	68.1	26.4	11	0.69	7.50×10^−6	0.45
Random 1	2.91×10^5	−60.0	−105.7	−31.4	82.8	6	0.79	1.47×10^−6	0.87
Random 2	2.04×10^5	−54.3	−37.1	159.9	162.8	9	0.44	7.90×10^−6	0.79
Random 3	4.05×10^5	−131.4	−42.8	−125.7	57.1	11	0.4	1.20×10^−5	0.66
Random 4	8.90×10^5	17.1	−5.7	−128.5	88.5	7	0.65	1.08×10^−5	0.49
Random 5	1.02×10^6	−168.5	142.8	−97.1	−25.7	10	0.44	1.09×10^−5	0.73
Random 6	4.25×10^5	20.0	17.1	−119.9	−105.7	11	0.68	1.09×10^−5	0.5
Random 7	1.44×10^6	40.0	−60.0	74.2	−91.4	6	0.58	8.10×10^−6	0.58
Random 8	4.85×10^5	77.1	62.8	−117.1	−14.3	12	0.64	1.25×10^−5	0.72
Random 9	3.46×10^5	102.8	−42.8	−165.6	−122.8	6	0.71	1.21×10^−5	0.41
Random 10	3.54×10^5	131.4	142.8	−142.8	−157.1	8	0.45	1.30×10^−5	0.85