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Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM
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SYSNO ASEP 0497737 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title Stiffening 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) RIDNumber of authors 5 Article number 62 Source Title Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM, Mechanisms and Machine Science. - Haarlem : Springer Netherlands, 2019 / Cavalca K. L. ; Weber H. I. - ISSN 2211-0984 - ISBN 978-3-030-20130-2 Pages s. 148-162 Number of pages 15 s. Number of copy 600 Number of pages 2212 Publication form Print - P Action IFToMM Rotordynamics 2018 VEvent location Rio de Janeiro Country BR - Brazil Language eng - English Country BR - Brazil Keywords bladed wheel ; dry-friction contacts ; damping Subject RIV BI - Acoustics OECD category Applied mechanics R&D Projects GA16-04546S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 EID SCOPUS 85051757019 DOI 10.1007/978-3-319-99270-9_11 Annotation Bladed 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.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
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