Operational Modal Analysis is a technique that aims to extract the modal model of a system from vibration data obtained in operational rather than laboratory conditions. The success of this technique comes from its capability of providing a modal model under real operating conditions (actual force and vibration level). This gives the possibility of using OMA for monitoring purposes and for having insight in the real behavior of the machine under investigation.
The application of OMA on rotating machines is still challenging. Due to the presence of harmonics, the unknown excitation input can not be considered the realization of a pure stochastic process. In this condition, OMA will give as a result a combination of structural modes and components already present in the input signal, that can be erroneously considered as structural modes of the system. Since the use of OMA on rotating machines is of high interest also in
industrial context, this project focuses on the research of reliable methods that allow the application of OMA even in presence of harmonics. The final goal of this project is to propose and validate a methodology that allows a continuous processing of long-term data acquired on rotating machines. The scope is to have insight in the modal behavior of the components under real operating conditions and propose ad-hoc updates for the new prototypes. To do so, not only harmonics have to be dealt with, but also an automatic OMA algorithm has to be developed.
Short titleFWO SB mandate
Effective start/end date1/01/1831/01/19

    Research areas

  • machines

ID: 36167039