MONITORING NATURAL PIT PROGRESSION ON A SLOW SPEED THRUST BEARING WITH ACOUSTIC EMISSION

Detecting the onset, propagation and location of non-artificial defects in a slow rotating thrust bearing with acoustic emission

Acoustic emission (AE) is defined as the phenomenon whereby transient elastic waves are generated by the rapid release of energy from localised sources within a material[1]; typical frequency content of AE is between 100 kHz to 1 MHz. The high sensitivity of AE in detecting the loss of mechanical integrity, as compared to the well-established vibration monitoring technique, has become its princ...

Acoustic Emission Application for Monitoring Bearing Defects

μ Control of a High Speed Spindle Thrust Magnetic Bearing

Experimental results demonstrate that μ synthesis provides an excellent tool for increasing the dynamic stiffness of thrust magnetic thrust bearings. Accurate system modeling and appropriate uncertainty descriptions are critical to obtaining such results and are described in detail. Both complex μ and mixed μ synthesis were used to design controllers. The performance of the μ controllers is com...

Flexural monitoring of carbon fiber/epoxy composite by acoustic emission

Carbon / epoxy composite is one of the most useful polymer matrix composites that has special properties such as high strength-to-weight ratio, high hardness, high corrosion resistance, Resistance to nuclear radiation has high consumption in different industries such as aerospace industry. Therefor monitoring of loading of this type of composite is important. In order to determine failure mecha...

Acoustic Emission-Based Prognostics of Slow Rotating Bearing Using Bayesian Techniques Under Dependent and Independent Samples

This study develops a novel degradation assessment index (DAI) from acoustic emission signal obtained from slow rotating bearings and integrates same into alternative Bayesian methods for the prediction of remaining useful life (RUL). The DAI is obtained by the integration of polynomial kernel principal component analysis (PKPCA), Gaussian mixture model (GMM) and exponentially weighted moving a...