Single Plane Balancing

Tutorialpg. 105Balancing rotating equipment is a form of correction for things that were either not uniform in material sciences or in assembly of components on a rotating shaft. The single plane balancing procedures are addressed, wherein one substitutes a corrective mass moment to compensate for these nonuniform distributions of imbalance. The approach to be used concentrates in several areas. The first area is the vibration sensors and related instrumentation. The next area is the response of a rotor as it runs up to operating speeds, with some introduction to the mode shapes involved. The third area is the plotting of data, specifically the polar plot, to give the balancer some insight on the “heavy spot” vs “high spot” relationship. Fourth, the balancing procedures creating a response vector (T) from a calibration or trial weight and shifting that vector to effectively cancel the “original” vector, resulting in smooth 1x synchronous motion are discussed. The fifth area is the calculation of the correcting influence coefficient in terms of a weight (or moment) vector unit per vibration unit with an “additive” angle to affect a future “one shot correction.” Finally, some other single plane techniques are discussed balancing with the coupling’s original residual unbalance, balancing without phase information, introduction of static-couple vector logic, and the review of some of the industry balancing standards. The tutorial will, in fact, takes a “balanced rotor,” unbalance it, plot its runup, determine a correction, vectorially, and plot the result. Multiple plane balancing will not be reviewed herein, primarily because of timing and the addition of three other vector triangle relationshi