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Abstract: The orbit is expressed as complex process, the theory of
complex process high-order cumulant is used in analysis of orbit. The
frequency domain characteristic of orbit complex process is discussed
combining with shape of orbit. It’s proved that the high-order cumulant
of gauss complex noise and noncorrelative noise between Re-part and Impart
is zero, and it is explained that this theory can depress broad noise
and narrow band noise. The operating frequency slicing and half
operating frequency slicing of bispectrum are defined. The numerical
value calculating method of analyzing orbit using bispectrum and slicing
of bispectrum is put forward. This method is introduced in the
identification of orbit of non-concentric rotor, the analysis result
show that this method has two function at the same time, which are orbit
purifying and fault signature extracting. The operating slicing of
bispectrum is used to analysis the orbit of several faults, the results
show that different orbit can be transformed into different value or
vectors.
Key words: Orbit High order cumulant Complex process Signature
extracting
CLC No: TH113
国家自然科学基金资助项目(50275024).
Received 20040410, received in revised form 20041010
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