Browse Publications Technical Papers 1999-01-0221
1999-03-01

Time Irreversibility and Comparison of Cyclic-Variability Models 1999-01-0221

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.

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