Vibrations of blades couple connected by slip-stick dry friction

0434489 - ÚT 2015 RIV CZ eng A - Abstrakt
Půst, Ladislav - Pešek, Luděk - Radolfová, Alena
Vibrations of blades couple connected by slip-stick dry friction.
Computational Mechanics 2014 - Book of extended abstracts. Plzeň: University of West Bohemia, 2014 - (Adámek, V.). s. 117-118. ISBN 978-80-261-0429-2.
[Computational Mechanics 2014 /30./. 03.11.2014-05.11.2014, Špičák]
Institucionální podpora: RVO:61388998
Klíčová slova: dry friction * stick – slip models * hysteretic loops
Kód oboru RIV: BI - Akustika a kmity

The reduction of enormous great resonance vibrations of turbine blades is very often realized by using dry friction contacts between vibrating elements. Many theoretical, numerical and experimental investigations of dynamic properties of turbine blades were done also in Institute of Thermomechanics ASCR particularly with the main attention on the development of means for reduction of dangerous resonance amplitudes of blades. The dynamic systems investigated in previous papers were two-blades-models connected either by a rubber element, by direct friction contact or by inserted friction element. Prepared paper describes a mathematical model for analysing the dynamic characteristics of two-blades bunch with more complicated stick-slip damping connections among blades than previously used friction characteristics. Several types of stick-slip mathematical models are presented and analysed. Effects of tangential micro-deformations in contact surfaces as well as of dry friction forces and excitation amplitudes on hysterezis loops and on response curves are shown.
Trvalý link: http://hdl.handle.net/11104/0239227