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Full-degrees-of-freedom frequency based substructuring [Elektronski vir]Drozg, Armin ; Čepon, Gregor ; Boltežar, MihaDividing the whole system into multiple subsystems and a separate dynamic analysis is common practice in the field of structural dynamics. The substructuring process improves the computational ... efficiency and enables an effective realization of the local optimization, modal updating and sensitivity analyses. This paper focuses on frequency-based substructuring methods using experimentally obtained data. An efficient substructuring process has already been demonstrated using numerically obtained frequency-response functions (FRFs). However, the experimental process suffers from several difficulties, among which, many of them are related to the rotational degrees of freedom. Thus, several attempts have been made to measure, expand or combine numerical correction methods in order to obtain a complete response model. The proposed methods have numerous limitations and are not yet generally applicable. Therefore, in this paper an alternative approach based on experimentally obtained data only, is proposed. The force-excited part of the FRF matrix is measured with piezoelectric translational and rotational direct accelerometers. The incomplete moment-excited part of the FRF matrix is expanded, based on the modal model. The proposed procedure is integrated in a Lagrange Multiplier Frequency Based Substructuring method and demonstrated on a simple beam structure, where the connection coordinates are mainly associated with the rotational degrees of freedom.Source: Mechanical systems and signal processing [Elektronski vir]. - ISSN 1096-1216 (Vol. 98, jan. 2018, Str. 570-579)Type of material - e-articlePublish date - 2018Language - englishCOBISS.SI-ID - 15565339
Author
Drozg, Armin |
Čepon, Gregor |
Boltežar, Miha
Topics
mehanske strukture |
dinamične lastnosti |
modalni parametri |
eksperimentalne modalne analize |
piezoelectric rotational accelerometer |
rotational degrees of freedom |
experimental modal analysis |
modal shape slopes |
FRF synthesis |
frequency-response functions |
experimental frequency based substructuring
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Database name | Field | Year |
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Drozg, Armin | |
Čepon, Gregor | 25798 |
Boltežar, Miha | 02034 |
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