|
| |
|
|
Q-learning used for control of AMB: reduced state definition
Březina, Tomáš ; Krejsa, Jiří
Previous work showed that stochastic strategy improved model free RL method known as Q-learning used on active magnetic bearing (AMB) model. So far the position, velocity and acceleration were used to describe the state of the system. This paper shows simplified version of controller which uses reduced state definition - position and velocity only. Furthermore the controlled initial conditions domain and its development during learning are shown.
|
|
|
Force calculations in permanent magnetic bearing
Bachorec, T. ; Šafr, M. ; Kozánek, Jan
Calculation of forces in permanent magnetic radial bearing by means of finite element method is presented and its results are compared with analytical estimates. From these results, the (slightly non-linear) relationship force versus radial displaceme is derived and the working position of rotor in the stator and predicted bearing stiffness are determined.
|
|
|
Modal and spectral properties of the rotor on permanent magnet bearings
Kozánek, Jan ; Scopel, D. ; Svoboda, R. ; Šafr, M.
In this article the spectral and modal properties of the rotor on contactless bearings are investigated. The dynamic behaviour, especially the eigenfrequencies and corresponding modes have been calculated in two different ways, by the FEM ANSYS software in the Institute of Thermomechanics and by the program DYNROT in TECHLAB company. The importance of this analysis is supported by the fact that the first non-rigid body resonance is not far from the working rotation speed 40 000 rpm .
|
|
| |
|
| |
|
|
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.
|
|
| |
|
|
Permanent and active magnetic bearings
Kozánek, Jan ; Stolařík, M. ; Šafr, M.
In this paper, the design of a permanent contactless radial bearings was studied. The motor will be used as dynamic stand for further research in the field of vibration and stability problems in rotor dynamics. Due to insufficient reliability of analytical calculation of permanent magnet forces, preliminary measurements on a simple device were performed. The results obtained were used for the dimensioning of the bearings to be designed.
|
|
| |
guest ::
