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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Vibration evaluation and identification in mechanical engineering
 Kozánek, Jan
This paper deals with parametric identification in mechanical engineering domain. We assume a linear mathematical model of vibrating machine in discrete form and in frequency domain, defined by stiffness, viscous damping and mass matrices and by the corresponding resolvent. Parametric identification is understood as the evaluation of the measured data from dynamic experiments and its methods can be divided into "indirect" (obtaining spectral and modal properties - modal analysis methods) and "direct" (determination of the coefficient matrices of the mathematical model). We mention also the parametric identification methods for parametric and evolutive dynamic systems , the loss of asymptotic stability and dynamic systems with weak nonlinearities.
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Spectral identification of ATUR rotor on aerodynamic bearings
 Kozánek, Jan ; Veselý, Jan ; Říha, I. ; Šafr, M.
In this paper the spectral identification of the rotor on aerodynamic tilting-pad bearings is presented. The identified resonances correspond to the calculated critical speeds from mathematical model and real parts of eigenvalues give us the additional iformation about the stability margin.
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Aerodynamic support for a big rotating machines
 Šimek, J. ; Kozánek, Jan ; Šafr, M.
Aerodynamic bearing support for a 100 kW input industrial turboblower was designed and partly tested. Rigid rotor with about 50 kg mass was run up to the maximum operating speed of 18.000 rpm. The rotor is supported in two aerodynamic tilting-pad journal bearings 120 mm in diameter, the axial forces are taken up by aerodynamic thrust bearing 250 mm in diameter. The tests showed trouble-free operation of journal bearings up to maximum operating speed.
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