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A numerical study of a high efficiency propeller in the aerodynamic noise generation is carried out. Based on RANS, three-dimensional numerical simulation is performed to obtain the aerodynamic performance of the propeller. The result of the aerodynamic analysis is given as input of the acoustic calculation. The sound is calculated using the Farassat 1A, which is derived from Ffowcs Williams–Hawkings...
In fault detection of power system, the detection for mutations signal is very important. The application of wavelet coefficients correlation denoising in signal detection for noisy fault problem is relatively widespread. However, after doing wavelet transform to the noisy signal, the wavelet coefficients of each scale will produce a small offset. This paper presents a wavelet coefficients correlation...
In order to improve the denoising accuracy of X radial diffraction signal, based on the introduction of stationary wavelet theory and analysis of existing problems of traditional threshold functions, a novel wavelet threshold denoising method is proposed. In the Matlab experimental platform we prove that this new threshold method can compensate for the deficiency the traditional soft/hard threshold...
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