Dynamic Characteristics of Air Cycle Machine Rotor System

Table 3

Resonance separation for the critical speed region.

Bearing stiffness (N/m)	Conical whirling critical speed region			Cylindrical whirling critical speed C (Hz)
	Separation point A (Hz)	Separation point B (Hz)	Difference value (Hz)
2.5 × 10^6	145.00	158.75	13.75	385.00
3.0 × 10^6	158.75	173.75	15.00	421.25
3.5 × 10^6	172.5	187.50	15.00	453.75
4.0 × 10^6	183.75	200.00	16.25	485.00