TY - JOUR N2 - Acoustic signal is more and more frequently used to diagnose machines operated in industrial conditions where installation of sensors is hindered. Impact of background noise seems to be the major problem as part of analysis of such signal. In most cases of industrial environments, background level is high; thus, it prevents against concluding as per standard methods that have been used in diagnostic testing. This study specifies the problem related to diagnosing machines operated under variable loads. Synchronous methods are used for diagnosing these types of machines, those include synchronisation of diagnostic signal with revolutions of the diagnosed machine. For the purpose of this study an acoustic signal was used as the diagnostic signal. Application of the synchronous method (order analysis) enables eliminating an impact of background noise derived from other sources. This study specifies application of acoustic signal to diagnose planetary gear in laboratory testing rig in order to discover damages at early stage of degradation. This method was compared with the method basing on measurement of vibrations. L1 - http://journals.pan.pl/Content/116317/PDF/aoa.2020.133147.pdf L2 - http://journals.pan.pl/Content/116317 PY - 2020 IS - No 2 EP - 270 DO - 10.24425/aoa.2020.133147 KW - acoustic diagnostics KW - vibroacoustics KW - order analysis A1 - Pawlik, Paweł PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 45 DA - 2020.05.10 T1 - The Use of the Acoustic Signal to Diagnose Machines Operated Under Variable Load SP - 263 UR - http://journals.pan.pl/dlibra/publication/edition/116317 T2 - Archives of Acoustics ER -