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Self excited two-mass system with soft impacts
Tondl, Aleš ; Kocanda, Lubomír
To a basic one-mass self-excited system a tuned absorber is attachedthe motion of which is influenced by soft impacts. The self-excitation is consideredas of van der Pol type one. The stops are symmetrically situated to the absorbermass equilibrium position. The results of numerical simulation are presented indiagrams showing the measure of extreme deflection of the basic system mass tothe amplitude of the basic system vibration without absorber in dependence on thetuning coefficient of the absorber.
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Self-excited oscilator with soft stops
Tondl, Aleš ; Kocanda, Lubomír
A self-excited system with one degree of freedom the motion of which is influenced by symmetrically situated soft stops in a certain distance from the equilibrium position is analysed. The stops are characterized by additional spring stiffness and stop deformation. The maximum deflection of the oscillator decreases with decreasing the stop distances and with increasing the stop stiffness and damping due to the stop deformation.
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Subharmonic motions of the oscillator with soft impacts
Peterka, František ; Tondl, Aleš
The excited one degree of freedom mechanical system with soft impacts, characterised by triangle hysteresis loop, is investigated using numerical simulation. Small viscous damping is assumed. Phenomena of subharmonic motions are explained by regions of their existence and stability in plane of dimensionless excitation frequency and static clearance. Bifurcation diagrams are evaluated during quasistationary changes of frequency by constant clearance.
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Dynamics of oscillator with piecewise linear model of soft impacts
Peterka, František ; Tondl, Aleš
The aim of this contribution is to present a more detail explanation of different types of motion of the oscillator with soft impacts using regions of existence and stability, phase trajectories and time series of impact motions. The explanation is exteded into lower and negative values of static clearance. Negative clearance corresponds to a static prestress of vibrating mass to the stop.
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