“…All the abovementioned variations use the same basic principle to detect the fault, that is, if the shape of wavelet base function selected to take wavelet transform matches or correlates at a specific scale and time with the shape of the burst or impulse created when the fault occurs in rolling element bearing, wavelet transform generates large wavelet coefficient value otherwise gives low wavelet coefficient value. For this reason, researchers used various types of wavelet base functions such as Morlet (Lin and Qu, 2000; Nikolaou and Antoniadis, 2002; Yan and Gao, 2009), Hermitian (Li et al, 2011), impulse (Junsheng et al, 2007), Laplace (Al-Raheem et al, 2007; Feng et al, 2011), and empirical (Wang et al, 2018) for taking wavelet transform. The main drawback of a wavelet transform is that an analyzing mother wavelet cannot be changed once it is fix because of this reason single as well as MF detection in vibration signal is a very difficult task as wavelet base function selected for taking wavelet transform is not adaptive for different types of faults and machine operating conditions.…”