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National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Influence of non-ideal driving motor on stability of vibrating system
 Půst, Ladislav ; Radolfová, Alena
Vibrations of mechanical 1DOF system excited by electric driving motor with limited power and inertia were analysed. Equations describing stationary and transient motions are derived by means of averaging method. Unstable section of response curves was ascertained and computing method for analysis of motion inside this section derived.
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Chaotické kmitání rázové soustavy s měkkým zdrojem energie
 Půst, Ladislav
Influence of weak source of exciting on the vibrations of mechanical system with elastic stop is investigated. Level of hard energy source changes damping of oscillating system and influences origine of quasi periodic and chaotic oscillations. Weak source of excitation increases of motion and suppresses dangerous chaotic motions.
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Vazba kmitajícího systému a zdroje energie
 Půst, Ladislav
Majority of publications on mechanical vibrations are based on the assumption that the external excitation is produced by an ideal source of power with prescribed frequency. But in reality, the excitation sources are non-ideal with limited power, limited inertia and their frequency fluctuates according the instantaneous state of oscillating system. The paper presents on overview of systems and results gained during the several dozens of years on this interaction problem. The most characteristic properties of systems excited by source of limited power and limited inertia are variation of revolution, distortion of harmonic motion, instability and non-uniform passage through resonance zone.
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Dynamical coupling between vibrating impact system and source of excitation
 Půst, Ladislav
Oscillations of 1DOF mechanical system containing one-sided weak or hard stop excited by means of a spring and a cam driven by a motor with limited power and limited inertia are investigated. Records of transient oscillations when passing through the resonance zone with increasing input energy into the motor show the retardation of frequency-increase in front of the resonance peak and the acceleration of frequency sweep at the jump in behind-resonance zone. The influence of clearance between the vibrating system and the stop, as well as of its stiffness and damping is investigated, too.
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