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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Judgement of Possibilities of Decrease of Vibration Magnitude of Forced Response by Actuating Kinematic Excitation Effect
 Markopoulos, A. ; Ondrouch, Jan ; Ferfecki, Petr
Summary: The task is to determine time history of a kinematic excitation so that after the initial transient component dies out, the magnitude of displacement a kinematicaly excited system has been lower than the magnitude of the system without kinematic excitation. The best solution of the investigated problem can be calculated by means of a procedure using minimization of the functional. However, numerical simulations shows that due to complexity of analysis proposed approach is not useful for solving systems with more than one of degree of freedom. They also tell that the best approaches to decrease a vibration magnitude of a rotor system supported by hydrodynamic bearings are methods using linearization equation of motion.
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Numerical Simulation of a Two-Crack Rotor System Supported by Radial Active Magnetic Bearings
 Ferfecki, Petr ; Ondrouch, Jan
In this work a computational simulation is utilized to investigate the steady-state response of a two-crack rotor system supported by radial active magnetic bearings on an excitation by centrifugal forces of discs unbalances. The static deflection of a shaft is considered larger than vibration amplitude of a shaft and therefore a so-called breathing behaviour of cracks is introduced. Parametric study has been carried out in order to investigate influence of different values of the angle between cracks on the steady-state response of a rotor system. The results presented in this work can therefore help with detection of cracks in the shaft.
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Comparison of numerically computed and experimentally measured response of a rotor system Rotor Kit 4 with a shaft weakened by a notch excited by a centrifugal force
 Ferfecki, Petr ; Ondrouch, Jan ; Sikora, R.
Shaft of a rotor system Rotor Kit 4 (RK 4) is weakened by a transverse notch. The response of a rotor system RK 4 with a shaft weakened by a notch excited by imbalance force is numerically computed on the basis of theory for transverse open crack. The stability of periodic vibration of a rotor system RK 4 was investigated by means of Floquet theory. Comparison of experimentally measured stiffnesses of a shaft, vibration responses and trajectories of a centre of a shaft is used for judgement of the computational model of rotor system RK4.
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Numerical Computation of a Response of the Rotor System RK 4 (Rotor Kit 4) with the Shaft Failured by Crack Excited by Centrifugal Force
 Ferfecki, Petr ; Ondrouch, Jan
A fatigue crack in rotor systems may cause large damage to the system if undetected and the economic loss is tremendous. The computational procedures for investigation of lateral vibration of a rotor system with a shaft containing open crack are developed. The response of rotor system is computed from equations of motion by means of Newmark method, trigonometric collocation method and stability of lateral vibration was investigated by means of Floquet theory.
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