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Vibration signal of the reciprocating engine may be described in several ways depend on the diagnostic purpose. For detecting non-uniform cylinder operation, for instance, lower harmonics of shaft vibration are interested. Then the signal can be assumed as stationary, ergodic and harmonic and may be expressed as a Fourier series. Assuming that transients are statistically independent some vibrations...
Main aim of paper is to present problems of use of physical probabilistic models in task of decreasing of uncertainty of prognosis of raise and evolution of failure. Presented considerations are supported by example of fatigue analysis of tooth breaking in gearbox.
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