BALANCING METHOD OF ROTOR ASSEMBLY OF CENTRIFUGAL COMPRESSOR Russian patent published in 2015 - IPC F04D29/66 

FIELD: machine building.

SUBSTANCE: balancing method of rotor assembly when shaft is preliminary divided to sections, directions of the radial runout of the sections are determined, shaft and installed rotor elements are balanced. During the rotor balancing direction of the residual unbalances of the shaft sections and rotor elements is kept towards the side opposite to the maximum radial runout of the rotor shaft sections, at that residual unbalances are determined: for unbalance in middle from equation: $$I_{middle}=\frac{M_{middle}}{M}{I}_{perm}$$ for unbalances at rotor periphery from equation: $$I_i=(I_{perm}-I_{middle})\frac{M_i{l}_i}{\Sigma M_i{l}_i},$$ where I_perm is permitted residual rotor unbalance, I_middle is residual unbalance of rotor middle part, I_i is residual unbalance of the rotor section, M is rotor weight, M_middle is weight of the rotor middle part, M_i is weight of the rotor section, l_i is distance of C.G. of the rotor section from C.G. of the rotor.

EFFECT: increased dynamic stability of the rotor during passing of the first critical frequency.

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