Balancing Method of Multi-span, Multi-bearing Rotor System : 1st Report, Multiplane, Multispeed Balancing

The least-squares method which uses influence coefficients was applied to a multispan, multibearing rotor system (10 bearings, 5 spans), and its effect was investigated. In this paper, the above balancing method was applied in the case where unbalance is distributed in one of the rotors in a multispan rotor system. The experimental results were as follows; (i) Simultaneous multiplane, -multispeed, -2 directional balancing yielded excellent results. (ii) When both horizontal and vertical vibrations are considered in balancing test, accurate balancing is to be expected.