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IEEE/ICACT20240429 Slide.17        [Big Slide]	Oral Presentation
	Fig. 1 indicates that some weak pulse-like pressures have been detected because the VE means the frequency component of pulse waveform. The fundamental frequency in the spectrograms is near 250 Hz. The fundamental frequency can be ideally computed as: fo = fr * N (4) where fo and fr denoted for fundamental frequency and rotating frequency in the operating condition, respectively. The number of ball is denoted by N. In this case fr =35 Hz, N = 8. Therefore, fo = 280 Hz. The frequencies of harmonics are kfo where k >1 and k are integers.

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