为解决航空发动机滑油系统安全性分析中容错与余度备份系统的故障建模与分析,提出了基于动态逻辑门和模块化思想的动态故障树分析方法。针对滑油系统某典型的故障状态,开展动态故障树建模,与传统的静态故障树建模方法进行比较。分析结果表明,使用静态故障树建模得到的滑油系统故障发生频率远远偏离系统真实的故障发生频次(误差将近20 倍);动态故障树建模可以准确描述系统故障的时序关系,且在保证分析效率的前提下精确评估滑油系统的故障发生概率。动态故障树建模方法在航空发动机系统尤其是民用航空发动机系统安全性评估中具有非常广泛的应用前景。
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.
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