Monitorování signálu akustické emise ze zatížených axiálních ložisek

Monitoring of Acoustic Emission Signal of Loaded Axial Bearings

journal article - other

en

The disclosure of initial stadium of contact fatigue of rotating machines is very difficult. At present, some methods which are suitable for diagnosis exist, such as vibration method, shock pulse method, acoustic emission and others. The article describes laboratory tests with axial bearings which are monitored by acoustic emission method. In the article, experimental stands, measuring devices and chosen types of axial bearings are presented. The exploitation of acoustic emission signal for the lifetime evaluation of selected bearings is shown with the characteristics as number of counts, rise time, maximal amplitude or duration of event. The bearing lifetime is separated to three stages and a representative sample in its time and frequency domain for each of them is chosen. Final failures of the bearings are shown too. The paper is focused also on examples of results obtained with continuous AE signal sensing.

Popis identifikace vzniku iniciačních stádií kontaktního poškození rotačních strojů je velmi obtížné. V současné době existuje několik vhodných postupů, které jsou vhodné pro tento typ diagnostiky (vibrační diagnostika, shock pulse metoda, akustická emise atd). Článek popisuje laboratorní experimenty na axiálních ložiscích, které byly monitorovány metodou akustické emise. Článek popisuje experimentální zařízení, metodiku zkoušek a zpracování signálu.

The disclosure of initial stadium of contact fatigue of rotating machines is very difficult. At present, some methods which are suitable for diagnosis exist, such as vibration method, shock pulse method, acoustic emission and others. The article describes laboratory tests with axial bearings which are monitored by acoustic emission method. In the article, experimental stands, measuring devices and chosen types of axial bearings are presented. The exploitation of acoustic emission signal for the lifetime evaluation of selected bearings is shown with the characteristics as number of counts, rise time, maximal amplitude or duration of event. The bearing lifetime is separated to three stages and a representative sample in its time and frequency domain for each of them is chosen. Final failures of the bearings are shown too. The paper is focused also on examples of results obtained with continuous AE signal sensing.

akustická emise, axiální ložisko, doba náběhu, časová oblast, frekvenční oblast

Acoustic emission, Axial bearing, Rise time, Time domain, Frequency domain

2011

10.11.2011

David Publishing

Libertyville, USA

1934-8959

2011

5A

717–724

8