Abstract Damage detection in rotating machines is well established for vibration signals. Unfortunately, there are situations, where usage of not possible. Then, acoustic signal could be used instead. usually more noisy and require special treatment obtain successful damage detection. In the paper we propose to use Variational mode decomposition (VMD) omit noise finding de-noise signal. We data...

Acoustic emission (AE) technology can predict the occurrence of partial discharge (PD) faults, which is used to improve safe operation level gas-insulated switchgear (GIS) equipment. However, strong noise interference from production site still main factor affecting identification accuracy. In this study, a simplified model designed approximate accumulation free metal particles on surface GIS i...

This study is a contribution to link the abstract phonological level to the acoustic signal level by identifying the main acoustic correlates for the distinctive feature set developed by Chomsky and Halle (1968). The acoustic features were extracted by the openSMILE toolkit from spontaneous speech data. For each distinctive feature a set of closely related acoustic features was derived by means...

A right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs again to produce another acoustic excitation. Correspondingly, two pairs of rigid metal tubes were used as acoustic resonators with resonance ...