Page 331 - Intro Predictive Maintenance

322 An Introduction to Predictive Maintenance

Figure 14–39 Typical spectral plot (i.e., vibration profile) of a defective belt.

Figure 14–40 Spectral plot of shaft rotational and belt defect (i.e.,
imbalance) frequencies.

Belts
V-belt drives typically consist of multiple belts mated with sheaves to form a means
of transmitting motive power. Individual belts, or an entire set of belts, can generate
abnormal dynamic forces and vibration. The dominant sources of belt-induced vibra-
tions are defects, imbalance, resonance, tension, and wear.