Maximum Likelihood Estimation of Equispaced Sinusoids in Rotating Machine Fault Detection
نویسندگان
چکیده
Rotating machines can generate signals composed of sinusoids equispaced in frequency. The spectrum of such signals is useful in detecting faults. Traditional Fourier–based spectrum estimation methods are often not sufficient due to the nonstationarity of measured signals. We propose maximum likelihood method for estimating the constant spacing of frequencies, when the number of samples is to be minimised. The spacing can be used to estimate the spectrum of the equispaced signal. Minimizing the measurement time reduces the undesirable effects of nonstationarity because short measurements are often almost station-
منابع مشابه
Estimation of Equispaced Sinusoids Using Maximum Likelihood Method
A signal composed of sinusoids equispaced in frequency appears in certain applications. One such applicationis fault detection of rotating machines. We propose maximum likelihood method for estimating the spacing of frequencies, when the number of samples is to be minimised. The application of maximum likelihood method is feasible because the equispaced property of the signal allows easy maximi...
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