|
| |
|
|
Lubrication of artificial joints -an essentially interdisciplinary problem
Pražák, Josef
The contemporary prevailing practice in the artificial joints application assumes implicitly a sufficient lubrication of the hoint surfaces by the spontaneous effusion fouid of the body liquids. The latter assumption is not apparently universally found and in many cases probably substantially limits the replacement usefulness. One assumes namely that the main cause of the definitive unstable fixation of endoprostheses in the bone structure is caused by the immunobiological reaction of the organism.
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
Simulation of impact´s effects in nonlinear parametric systems
Škuderová, Alena
The creation of gear pair model with elastic bearings was the aim this work. The model considers the influence of motion in bearings nor only at direction of line of mesh, but and at normal direction, the damping and periodically variable stiffness in the gear mesh, frictional forces, possibly eccentricity of gears or manufacturing inaccuracy of teeth profile and influence of impacts caused by existence of backlash.
|
|
| |
|
|
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 .
|
guest ::
