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The following parameters have the most influence on the dynamics of a high-speed turbomachine’s rotor system: mass and stiffness distribution of a rotor; damping properties of materials of rotor’s elements; location of bearings, sealings and dampers; type, design and operational conditions of bearings, sealings and dampers; mass and inertia characteristics of machine’s housing; operational conditions of a turbomachine itself. It should be noted that presence of fluid-film bearings complicates the dynamic analysis, since such bearings: 1) are not standard elements and require adequate mathematical models for every application; 2) can initiate occurrence of self-excited, parametric and chaotic oscillations; 3) can vary their dynamic characteristics in a wide range depending on the combination of operational and geometric parameters.
It is thus obvious quite urgent to search for some rational parameters if a rotor system during design and preliminary calculation, which in many cases leads to the problems of optimal parametric design. One of the main yet controversial problems of parametric design in the field of rotor system dynamics is determination of quality indicators for a particular case of a rotor system. The present paper a criterion is proposed based on efficiency of rotor system’s input energy. Analysis of a number of parameters’, e.g. values of constant external forces (rotor’s mass), varying external forces (imbalance) and types of bearings, influence on this criterion has also been carried out.