In this paper, a dynamic fault tree model was first applied to evaluate safety of the engine lubrication system with faulttolerance and redundancy configuration. Using the dynamic fault tree and classical fault tree methods, a typical failure condition of the lubrication system was modeled and analyzed. The results show that the classical fault tree model cannot quantify the dynamic behavior aspect of system safety in a reasonable fashion, and prediction of failure probability deviates far from the actual situation (analytical errors up to 20 times). Meanwhile, the dynamic fault tree model not only correctly describes the sequence-based failure conditions, but also efficiently yields better quantitative failure probability calculation, demonstrating that dynamic fault tree model will have high potential in safety analysis of engine systems.

engine  /  lubrication system  /  safety analysis  /  dynamic fault modeling