This project is related to the section 4.1.3 of the FAPESP thematic project grant #2015/20363-6 and consists of a temporal response analysis of a rotor-bearing system under worn bearings condition, since these components significantly influence the dynamic response of rotors. In addition to the numerical results obtained by a proposed model, it will be evaluated the experimental dynamic response of the corresponding rotating system. It will be used an instrumented test rig so that the system time response can be studied by observing the sensitivity of this response to the wear parameters. It is expected to detect the rise of additional harmonics, as observed by Chasalevris et al. 2013. To achieve this goal, an external excitation is given, in addition to the mass unbalance, by an electromagnetic actuator, facilitating the variation of the excitation frequency, and enabling the application of forces without direct contact with the rotor. In the next stage, the aim is to validate the proposed numerical model for the worn bearing with experimental results and, consequently, obtain a robust model that is sensitive to the wear parameters. Finally, it is proposed a methodology for identifying the presence of wear in journal bearings, using information from harmonics that emerges in the frequency spectrum of the rotating system response.
News published in Agência FAPESP Newsletter about the scholarship: