Number of the records: 1
Study of dry-friction damping effect on two simplified models of flutter oscillations
- 1.
SYSNO ASEP 0507377 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Study of dry-friction damping effect on two simplified models of flutter oscillations Author(s) Pešek, Luděk (UT-L) RID
Půst, Ladislav (UT-L) RID
Šnábl, Pavel (UT-L) ORCIDNumber of authors 3 Article number 00730337 Source Title Advances in Mechanism and Machine Science, Mechanisms and Machine Science. - Krakow : Springer Nature Switzerland, 2019 / Uhl T. - ISSN 2211-0984 - ISBN 978-3-030-20130-2 Pages s. 3419-3428 Number of pages 10 s. Publication form Print - P Action IFTOMM /15./ Event date 30.06.2019 - 04.07.2019 VEvent location Krakow Country PL - Poland Event type WRD Language eng - English Country PL - Poland Keywords flutter oscillations of turbine blades ; dry friction ; damping of vibration ; modes ; nodal diameters Subject RIV BI - Acoustics OECD category Applied mechanics R&D Projects GC19-02288J GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 EID SCOPUS 85067561678 DOI 10.1007/978-3-030-20131-9_337 Annotation Dry-friction damping effect to reduction of self-excited vibrations due to aero-elastic instability is studied on numerical reduced model of rotating turbine wheel with 30 blades. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blades cascade. Dry friction contact damping is considered as one of the very effective methods for self-excited “flutter” vibrations. The study is oriented on the narrow frequency range and therefore the blades are modelled as systems with one degree of freedom (DOF). The selfexcited aero-elastic forces of blades are described by two different types of Van der Pol model. It is shown for both self-excitation models that the dry friction forces needed for suppression of dangerous flutter vibrations strongly depends on the complexity of modes and also on the mutual positions of excitation forces to damping elements. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020
Number of the records: 1