Page 123 - Improving Machinery Reliability

Machinery Reliability Audits and Reviews 95

pling and another equal unbalance is used out-of-phase on the impeller or wheel far-
thest from the coupling or on the other coupling if it is a drive-through machine. This
type of unbalance was used in the mechanical mn sensitivity test shown in Figure 3-5.

Sensitivity to Bearing Clearance. The computer response analyses for coupling
unbalance are given in Figures 3-8, 3-9, and 3-10 for minimum, nominal, and maxi-
mum clearances. In order to compare the computer results with the test data, the corn-

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RoloR spm <rn)
Figure 3-8. Rotor response calculations for coupling unbalance and minimum clearance.

Figure 3-9. Rotor response calculations for coupling unbalance and nominal clearance.