Ajuste de modelos lineares aplicado a maquinas rotativas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

Generally, when talking about the design procedure and simulation of rotors, the approaches and inherent hypotheses to the applicable mathematical models to such types of machines bring numerical responses different from that obtained in experimental mensurements. The models updating theory has for objective to minimize such kind of errors through techniques that, starting from experimental data measured in machines or structures, and comparing with the respective mathematical models, can fit the model so that it is more reliable and representative of the real system. The present work proposes the use of this theory applying unrestricted optimization methods to obtain a design methodology that makes possible the calibration of mathematical models. For that, a rotor with a centered disk in rigid foundation and supported by two hydrodynamic cylindrical bearings, was used as object of study of this work. The displacements of the shaft were monitored, as well the bearing housings displacements and the dynamic forces acting in the bearings. In the math_matical model, based on the fmite element model ofthe rotor and in the Reynolds equation solution for finite differences to the bearings, the parameters monitored in the real rotor can be obtained numerically. There are defined error vectors based on the answers that represent the parameters to be minimized inside a direct updating method, through parameters optimization that durectly influence in the system response, as the stiffness and damping coefficients of the bearings. As conclusion, it is possible to verify the validity of the proposed procedure, once the method was capable to calibrate the mathematical model and then, to obtain more reliable results of the physical system. The work still presents a significant contribution for the design area of rotating machines, because the methodology is relatively simple and sufficiently robust for ftting and validation of computational rotors and bearings models in laboratories

ASSUNTO(S)

mancais hidrostaticos otimização matematica rotores - dinamica - metodos experimentais

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