Hybrid modelling for analysis and identification of rotors

In this paper a rotating shaft-disc system, modelled as a series of interco nnected, distributed and lumped elements is considered. The overall transfe r matrix of the system formed by series flexible distributed elements and r igid disc elements is determined, then applying supporting end boundary con ditions the characteristic determinant of the system is computed. The dampe d natural frequency of the system is computed by a direct determinant searc h method. Thereafter a novel method is proposed for the determination of th e frequency response function. The overall system is identified as a linear multivariable dynamic system with secund order transfer function elements, Future applications of this hybrid technique are discussed. (C) 2000 Elsev ier Science S.A, All rights reserved.