Abstract
Very well elaborated recent methods for balancing flexible rotors are based on the approximation of the deflection brought about by its unbalance, by the normal modes of the rotor. Since normal modes depend on boundary conditions, the so performed balancing of the rotor also depends on them. This fact may lead to some difficulties if the stiffness of the rotor bearings is considerably unisotropic in various radial directions or if the rotor has been balanced on the balancing machine with stiffness characteristics of bearing mounting essentially other under actual operation. — A method is suggested in the paper that removes the mentioned dependence of flexible rotor balancing on its boundary conditions. It is based on the approximation of the deflection by a complete system of coordinate functions independent on the stiffness of supporting its ends. Hence the flexible rotor, one balanced according to this method, will continue to be balanced even under an arbitrary stiffness of its bearings.
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