Page 76 - Compression Machinery for Oil and Gas

Centrifugal Compressors Chapter
NC2 = 15,000 rpm
AF2= 2.05
Rotordynamic response plot
Operating
speed
Second critical
Second mode
speed
25
10
5
15
0
20
30
45
50
35
40
Response (microns pk-pk)
20,000 20,000 15,000 10,000 5000 0 Rotor speed (rpm) configurations. unbalance mode second and 3 67
NC1 = 4060 rpm AF1 = 5.84 First mode 18,000 16,000 14,000 first the for
Rotordynamic response plot Operating speed 12,000 10,000 8000 Rotor speed (rpm) examples plot response
First critical speed 6000 4000 2000 amplitude Unbalance

0
50 40 30 20 10 0 3.33
Response (microns pk-pk)
FIG.