REDUÇÃO DE RUÍDOS EM SINAIS DE VIBRAÇÕES DE IMPLOSÃO DE BOLHAS NA CAVITAÇÃO EM GRANDES DUTOS DE ÁGUA.

This paper presents a mathematical analysis of the signal waves of the vibration caused by the implosion of water bubbles during the fluid flow in water ducts of greater size. Therefore, the main purpose of this study was to identify the duration and the frequency of such vibrations, which are important for the study of the phenomenon of bubble implosion due to its consequences. The methodology consisted of using signal analysis techniques like the analysis of the original signal by Fourier transform and the power spectrum to distinguish the frequency of the pulses of noise peaks. The signal spectrogram helped to define the temporal location, by using different parameters, raising its temporal resolution. For the temporal determination of pulses it was used a low-pass filter around every determined frequency in Fourier transform. We concluded that summing up all signal filtered components resulted in an approximation of the original signal without noises. [ABSTRACT FROM AUTHOR]