Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty

Table 2

The operating speeds.

Operating speeds	Value (rev/min)
ω 1	3000
ω 2	3500
ω 3	4000
ω 4	4500
ω 5	5000
ω 6	5500
ω 7	6000
ω 8	6500
ω 9	7000