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EnglishIn mechanical systems coupled with joints, accurate prediction of the joint characteristics is extremely important. Despite years of research, a lot is yet to be learnt about the joints’ interface dynamics. The problem becomes even more difficult when the interface Degrees-of-Freedom (DoF) are inaccessible for Frequency Response Function (FRF) measurements. This is, for example, the case of bladed-disk systems with dove-tail or fir-tree type joints. Therefore, an FRF based expansion method called System Equivalent Model Mixing (SEMM) is used to obtain expanded interface dynamics. The method uses numerical and experimental sub-models of each component and their assembly to produce the respective expanded or hybrid sub-models. By applying substructure decoupling to these sub-models, the joint can be identified. However, the joint can be noisy due to expansion and measurement errors which propagate to the hybrid sub-models. In this paper, a correlation based approach is proposed in the SEMM method wherein the quality of the expanded sub-models is improved. In this new approach, several expanded models are generated systematically using different combinations of the experimental FRFs and computing a parameter, Frequency Response Assurance Criteria (FRAC), to evaluate quality of the contribution of the different measurements. The lowest correlated channels or FRFs can be filtered out based on a certain threshold value of FRAC. Using the improved hybrid sub-models, the joint identification also shows a remarkable improvement. The test object for the method is an assembly of disk and one blade with a dove-tail joint.
Joint identification through hybrid models improved by correlations / Saeed, Zeeshan; Firrone, Christian Maria; Berruti, Teresa Maria. - In: JOURNAL OF SOUND AND VIBRATION. - ISSN 0022-460X. - ELETTRONICO. - 494:3 March 2021(2020), pp. 1-19.
| Titolo: | Joint identification through hybrid models improved by correlations |
| Autori: | |
| Data di pubblicazione: | 2020 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.jsv.2020.115889 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Preprint_00_Manuscript_v1_r2.pdf | Preprint_Non-reviewed_Manuscript | 1. Preprint / Submitted Version |  | Visibile a tuttiVisualizza/Apri |
| 1-s2.0-S0022460X20307288-main.pdf | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia | |
| Postprint_AuthorManuscript_00_Manuscript_JSV_v4_r1.pdf | Accepted author's manuscript of the article | 2. Post-print / Author's Accepted Manuscript | | Embargo: 27/11/2022 Richiedi una copia |
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