Rainflow-counting Algorithm

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available from Wikipedia or other free sources online. The
rainflow-counting algorithm (also known as the "rain-flow counting
method") is used in the analysis of fatigue data in order to reduce a
spectrum of varying stress into a set of simple stress reversals. Its
importance is that it allows the application of Miner's rule in order to
assess the fatigue life of a structure subject to complex loading. The
algorithm was developed by Tatsuo Endo and M. Matsuiski in 1968. Though
there are a number of cycle-counting algorithms for such applications,
the rainflow method is the most popular as of 2008.