Time irreversibility and comparison of cyclic-variability
J.B. Green, Jr., C.S. Daw, J.S. Armfield Oak
Ridge National Laboratory
University of Tennessee
J.A. Drallmeier University of Missouri-Rolla
University of California, San Diego
P. Durbetaki Georgia Institute of
We describe a method for detecting and quantifying time irreversibility in
experimental engine data. We apply this method to experimental heat-release
measurements from four spark-ignited engines under leaning fueling conditions.
We demonstrate that the observed behavior is inconsistent with a linear
Gaussian random process and is more appropriately described as a noisy
nonlinear dynamical process.
Green JB Jr, Daw CS, Armfield JS, Finney CEA, Wagner RM, Drallmeier JA, Kennel
MB, Durbetaki P (1998). Time irreversibility and comparison of
cyclic-variability models. SAE Paper 1999-01-0221.
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