Mechanical Vibrations Analysis in Direct Drive Using CWT with Complex Morlet Wavelet

Abstract Modern industrial process and household equipment more often use direct drives. According to European policy, Industry 4.0 new 5.0 need undertake the effort required ensure a sustainable, human-centric, resilient industry. One of main problems rotating machines is mechanical vibrations that can limit lifetime final product or machine in which they are applied. Therefore, analysis vibration electrical drives crucial for appropriate maintenance machine. The present article undertakes an measured at laboratory stand with multiple dominant frequencies range 50–500 Hz. fast Fourier transform (FFT) gives information about frequency component without its time localisation. While solution made available by short-time (STFT) able overcome problem FFT, it still has limitations, particularly terms there being lacuna localisation; accordingly, felt other methods give good localisation frequency. In article, continuous wavelet (CWT) was investigated, requires selection function (kernel transformation). complex Morlet selected description central bandwidth. CWT STFT time-frequency capabilities were compared investigate data registered from direct-drive stand. better than even same resolution. Vibration near-locations separated joined them into one wide pick. To extraction features electric drive systems, author, based on analysing results study, recommends be used instead STFT.