Formulation of a Transfer Function between （制定之间的传递函数）.pdfVIP

Energy and Power 2012, 2(6): 107-115 DOI: 10.5923/j.ep 01 Formulation of a Transfer Function between Rotor Responses on a High Speed Balancing Machine and in Turbo Machinery by System Identification 1,* 2 3 G. G. Muscolo , S. Casadio , P. Forte 1Humanot s.r.l., Via Armando Spadini, 16, 50142, Firenze (FI), Italy 2GE OilGas Headquarters, Nuovo Pignone S.p.A., via Felice Matteucci, 2 - 50127, Firenze (FI), Italy 3Dept. of Civil and Industrial Engineering, University of Pisa, Largo Lazzarino , 56122, Pisa (PI), Italy Abstract In this paper the authors propose an innovative method for the determination of a transfer function (MTF) between the rotor responses on a balancing machine (HSB) and on turbo machinery (SP). The prediction of the rotor behav ior in its turbo machine final housing is a crucial problem for turbo machinery manufacturers and very complex to solve using classical approaches. The proposed method uses a particular MTF formula, calculated with a black/box approach based on the application of the theory of System Identification, using the rotor responses in SP and in HSB as input and output respectively. MTF was determined by a regression analysis of the responses in HSB and SP of 10 rotors; subsequently it was tested and validated on other 15 rotors. The results demonstrate that proposed MTF simulates a rotor behavior in SP with a satisfactory overlapping of the measured output. Keywords Rotor Dynamics, Balancing, System Identification, Vibrations, Black-Box, Transfer Function to define the mathematical model.