Continuous Rotor Dynamics of Multi-Disc and Multi-Span Rotors: A Theoretical and Numerical Investigation of the Identification of Rotor Unbalance from Unbalance Responses

Rotor unbalance identification plays a critical role in balancing rotors. In this paper, concerned with multi-disc and multi-span rotor-bearing systems, two novel algorithms called the Single Direction Algorithm (SDA) Two Orthogonal (TODA) are proposed for identifying rotor from responses. A matrix method is to solve problem of equations being non-linear transcendental, there too many unknown variables equations, unbalances bearing coefficients coupled together. The responses at all eccentric discs necessary their unbalances. Numerical simulations conducted validate methods. Moreover, an adjustment point found, proper sensor resolution suggested achieve high accuracy by means numerical studies. addition, SDA better than TODA, more practical suitable medium-speed high-speed have flexibility incorporate any number bearings provide technique monitoring without test runs or external exciters.