Nonstationary Envelope Process and First Excursion Probability

ABSTRACT The definition of stationary random envelope proposed by Cramer and Leadbetter, is extended to the envelope of nonstationary random processes possessing evolutionary power spectral densities. The density function, the joint density function, the moment function, and the crossing rate of a level of the nonstationary envelope process are derived. Based on the envelope statistics, approximate solutions to the first excursion probability of nonstationary random processes are obtained. In particular, applications of the first excursion probability to the earthquake engineering problems are demonstrated in detail.

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