Study of dry-friction damping effect on two simplified models of flutter oscillations

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00507377" target="_blank" >RIV/61388998:_____/19:00507377 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/978-3-030-20131-9_337" target="_blank" >http://dx.doi.org/10.1007/978-3-030-20131-9_337</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/978-3-030-20131-9_337" target="_blank" >10.1007/978-3-030-20131-9_337</a>

Result language
angličtina
Original language name
Study of dry-friction damping effect on two simplified models of flutter oscillations
Original language description
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.
Czech name
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Czech description
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Project
<a href="/en/project/GC19-02288J" target="_blank" >GC19-02288J: Robust reduced-order modeling of fluid-structure interaction problems</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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