| It is observed in Table 2.3.1 that the balancing masses and their locations (radial as well as angular) are unknowns while the location of the balancing plane itself is treated as a known (any accessible location near the bearings etc). The resultant total forces and moments must sum up to ZERO and therefore we have four equations but six unknowns. Thus any two of the six unknowns can be freely chosen and the other four determined from the computations given in the table. This method of balancing is known as the “two-plane balancing technique” since balancing masses are kept in two planes.
We will now work out an example, to illustrate the procedure.
Ex. 2.3.1 For the rotor shown in Fig. 2.3.2, find the magnitude and the angular location of the balancing masses.
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