Archives of Acoustics, 31, 2, pp. 167-177, 2006
Demodulation of non-stationary machine vibration using cycle-time scale
Inner time-scale affects the operation of angle demodulator. Can linear approximation of monotonic variations in carrier-cycle improve the recovery of unknown low-energy signal modulating observable vibration processes? Authors make an attempt to answer using phase-locked loop PLL as demodulator. Simulations conducted for complex phase model indicate potentially vast possibilities of recognizing and selection of information component. Appropriate selection of approximation time-range enables to achieve acceptable RMS value loads and harmonics of rotational speed of outgoing estimates.
Keywords: diagnostics, modulation, synchronism
Full Text: PDF
Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN)