| Autor(es): |
Dreher, Nathali
;
Storti, Gustavo
;
Machado, Tiago
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PROCEEDINGS OF THE 9TH INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE, IOMAC 2022; v. N/A, p. 8-pg., 2022-01-01. |
| Resumo | |
Operational Modal Analysis has been widely used to extract and monitor modal parameters of systems in operation. There is a great number of research in which OMA was successfully implemented, the majority encompassing civil structures, such as beams, bridges, and buildings. However, applying OMA to rotating machines can be a real challenge. These systems are usually subjected to non-stationarity, caused, for example, by changes in rotational speed. In addition, they can be installed in areas without the influence of excitation conditions that agree with OMA's main premise. However, even when the operating conditions are favorable, the identification of the rotor's modes is still a challenge. Due to the gyroscopic effect, the backward and the forward frequencies of each vibration mode may move away or towards each other, appearing sometimes as closely spaced frequencies that are difficult to identify and differentiate via OMA techniques. The transformation of the rotor's response from the physical coordinates to directional coordinates have been widely used to separate the forward and backward components of the rotor's response. The purpose of this paper is to employ this transformation and apply OMA to each directional coordinate, enabling the identification of both forward and backward frequencies of the rotor's modes and improving the results of OMA in rotating machines. The methodology was applied to a dataset of a test rig with a rotor supported by hydrodynamic bearings, and the results showed that directional coordinates are a promising tool to improve the identification of rotor modes. (AU) | |
| Processo FAPESP: | 19/00974-1 - Monitoramento da condição e prognóstico de mancais considerando incertezas |
| Beneficiário: | Katia Lucchesi Cavalca Dedini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |