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Circuit resistance modeling in failing heart rotary pump support
Musil, Jan ; Pražák, Josef ; Leitermann, D.
The stepwise resistance increase caused by the throttle valve usage in the mock-line circuit comprising the pulsating ventricle in failing heart modus and supported by rotary pump set up in parallel was studied. It appears thus important to regulate support system producing a continuous type of flow to such a regime not allowing the pulsating flow of the failing heart to disappear and preventing the mean systemic pressure value before substantial increase.
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Dynamics of permanent magnetic bearing
Půst, Ladislav
The basic analysis of radial bearings properties including nonlinear characteristics are presented. The mathematical models of vertical and horizontal rotors supported by permanent magnetic bearings are derived. Splitting of resonance's due to the rotor weight and existence higher harmonics are mentioned as well.
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Global view on dynamics of impact oscillator
Peterka, František
Impact oscillator is the simplest mechanical system with one degree of freedom, the periodically excited mass of which can impact on the stop. The aim of this paper is to explain the dynamics of the system, when the stiffness of the stop changes from** to infinity. It corresponds to the transition from the linear system into strongly nonlinear system with rigid impact.
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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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