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Have you forgotten your login? Create your web page Haltools: Vibration-based condition monitoring of rotating machines in nonstationary regime.

Dany Abboud 1 Details. Dany Abboud 1 AuthorId: In the last decades, vibration-based condition monitoring of rotating machine has gained special interest providing an efficient aid for maintenance in the industry.

Nowadays, many efficient techniques are well-established, rooted on powerful tools vibratoiree in particular by the theory of cyclostationary processes. However, all these techniques rely on the assump-tion of constant— or possibly fluctuating but stationary— operating regime i.


Unfortunately, most monitored machines used in the industry operate under nonstationary regimes in order to fulfill the task for which they have been designed. In this case, these techniques fail in analyzing the produced vibration signals.

This issue, therefore, has occupied the scientific committee in the last decade and some sophisticated signal processing techniques have been conceived to deal with regime variability. But these works remain limited, dispersed and generally not supported by theoretical frameworks. The principal goal of this thesis is to partially fill in this gap on the basis of a theoretical formalization of the subject and a systematic development of new dedicated signal processing tools.

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In this work, the nonstationarity of the regime is confined to that of the speed— i. In order to reach this goal, the adopted methodology consists in extending the cyclostationary framework together with its dedicated tools. We have elaborated this strategy by distinguishing two types of signatures.


Machinne first type includes deterministic waveforms known as first-order cyclostationary. The proposed solution consists in generalizing the first-order cyclostationary class to the more general first-order cyclo-non-stationary class which enfolds speed-varying deterministic signals. The second type includes machihe periodically-correlated waveforms known as second-order cyclostationary.


Three different but complementary visions have been proposed to deal with the changes induced by the nonstationarity of the operating speed. Many tools have been conceived whose performances have been successfully tested on simulated and real vibration signals.

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