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RESEARCH PAPERS: Offshore Mechanics

Parallel System Approach for Vector Out-Crossing

[+] Author and Article Information
O̸. Hagen, L. Tvedt

A.S. Veritas Research, Ho̸vik, Norway

J. Offshore Mech. Arct. Eng 114(2), 122-128 (May 01, 1992) (7 pages) doi:10.1115/1.2919959 History: Received January 21, 1992; Online June 12, 2008

Abstract

The mean crossing rate of a stochastic process out-crossing a safe domain is calculated using methods from time-independent reliability theory. The method is developed from Madsen’s formula which expresses the mean up-crossing rate of a scalar process through a specified level as a parallel system sensitivity measure. The method is applicable to stationary as well as nonstationary stochastic vector processes provided the random variables describing the process and the time-derivative process at time t can be mapped jointly into a set of independent standardized random normal variables. This is identical to the restriction imposed on the random variables using the first and second-order reliability methods (FORM, SORM), and is not very restrictive. Thus, quite general stochastic models can be treated. Also, closed-form results have been developed. In this paper the mean crossing rate for the stationary Gaussian process crossing into a polyhedral convex set is given. The method is demonstrated to give good results by examples.

Copyright © 1992 by The American Society of Mechanical Engineers
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