An adaptive wavelet packet transform (AWPT) algorithm is proposed to process synthetic aperture radar (SAR) imagery and remove background clutters from target images. Since target features are more efficiently represented using the wavelet packet bases, higher signal-to-clutter ratios (SCR) can be achieved in the wavelet transform domain. Consequently, clutters can be more effectively separated...

Wing-assisted technology is an effective way to reduce emissions and promote the decarbonization of shipping industry. The lifting lowering wing-sail usually driven by hydraulic system. Leakage, as important failure form, directly affects safety well functioning To increase system reliability improve wing-assisted effect, it essential conduct leakage fault diagnosis In this paper, AMESim simula...

Recently, it was suggested that spectrum estimation can be accomplished by applying wavelet denoising methodology to wavelet packet coefficients derived from the logarithm of a spectrum estimate. The particular algorithm we consider consists of computing the logarithm of the multitaper spectrum estimator, applying an orthonormal transform derived from a wavelet packet tree to the log multitaper...

This paper presents a methodology for an automation of fault diagnosis of ball bearings having localized defects (spalls) on the various bearing components. The system uses the wavelet packet decomposition using ‘rbio5.5’ real mother wavelet function for feature extraction from the vibration signal, recorded for various bearing fault conditions. The decomposition level is determined by the samp...

Chatter is one of the biggest unfavorable factors during high speed machining process a machine tool. It severely affects surface finish and geometric accuracy workpiece. To address this obstacle improve quality efficiency products, it significantly essential to detect chatter machining. Therefore, multi-feature recognition system for detection on basis fusion technology wavelet packet transfor...

In this paper, an improved algorithm of wavelet packet-chaos model for life prediction of space relays based on volterra series is proposed. In the proposed method, the high and low frequency time sequence components of performance parameters are obtained by employing the improved wavelet packet transform to decompose the performance parameters of the relay into multiple scales. Then the optimi...