Number of the records: 1  

Stiffening Effect and Dry-Friction Damping of Bladed Wheel Model with “Tie-Boss” Couplings - Numerical and Experimental Investigation

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    SYSNO ASEP0499318
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeThe record was not marked in the RIV
    TitleStiffening Effect and Dry-Friction Damping of Bladed Wheel Model with “Tie-Boss” Couplings - Numerical and Experimental Investigation
    Author(s) Pešek, Luděk (UT-L) RID
    Půst, Ladislav (UT-L) RID
    Šulc, Petr (UT-L) RID
    Šnábl, Pavel (UT-L) ORCID
    Bula, Vítězslav (UT-L) RID
    Number of authors5
    Article number62
    Source TitleMechanisms and Machine Science 2018. - Switzerland : Springer Naure Switzerland AG 2019, 2018 / Cavalca K.L. ; Weber H.I. - ISBN 978-3-319-99261-7
    Pagess. 148-162
    Number of pages15 s.
    Publication formPrint - P
    ActionIFToMM Rotordynamics 2018
    Event date23.09.2018 - 27.09.2018
    VEvent locationRio de Janeiro
    CountryBR - Brazil
    Event typeWRD
    Languageeng - English
    CountryBR - Brazil
    Keywordsbladed wheel ; dry-friction contacts ; damping
    Subject RIVBI - Acoustics
    OECD categoryApplied mechanics
    R&D ProjectsGA16-04546S GA ČR - Czech Science Foundation (CSF)
    Institutional supportUT-L - RVO:61388998
    DOI10.1007/978-3-319-99262-4
    AnnotationBladed wheel model with tie-boss couplings for numerical and experimental investigation of stiffening and friction damping between tie-bosses is introduced. The modal behavior of FE numerical models of the wheel for two contact limit states, i.e. open and bonded contacts, was ascertained. The experimental modal analysis of the wheel both for open and pre-stressed contacts were performed, too. For detail stiffening and damping effect investigationthe physical model of three-blade-bundle was elaborated. The experiments were performed for different excitation forces, excitation frequencies and contact prestresses.The dynamics of the bundle with respect to different contact states was evaluated from vibration attenuation after short resonant excitation. It was observed that if the macroslips arise in contacts that eigen-frequencies of the bundle are very close to the eigen-frequencies of open contact model bundle and high damping effect is achieved. If the microslips arise in contacts the eigenfrequencies are close to eigen-frequencies of the bond contact model and lowdamping is achieved. Hence the stiffening effect is high only in the case of
    microslips. The slip transition is conditioned by the level of adhesion that must be exceeded by excitation force. The FE model of the wheel and blade triple model with dynamic frictional contacts in the tie-boss couplings were developed and calculated results are compared with experiment.
    WorkplaceInstitute of Thermomechanics
    ContactMarie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823
    Year of Publishing2019
Number of the records: 1  

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