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The gear cases are widely used in aviation engines. The gear cases faults affect somewhat the safety of the engines and aircrafts. Gear faults detection is very important because the majority fault of gearbox is caused by the gears. The time-frequency distribution based cepstrum approach is applied to identify the gear fault in this paper. Both the Wigner-Viller distribution and Fourier transformation...
A novel blind source separation (BSS) method of Frequency-Hopping (FH) signals based on time frequency ratio is proposed in this paper. The Short Time Fourier Transform (STFT) of each observation is computed firstly. Then the TF Ratios information of the mixed signals is used to localize the single source zone. Finally, we can obtain an estimation of the separating matrix and output signals. Comparing...
Random carrier-frequency (RCF) modulation has been applied to DC/DC converters, reducing conducted EMI significantly. The selection of the duty cycle is critical in terms of suppressing EMI level in RCF modulation. But limited related literature is available. In this paper, we analysis the effect of duty cycle on suppressing EMI level by deduced the expression of the amplitude of switching voltage...
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