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Based on the structure and operation mechanism of the dual-stage lithographic system, fault tree analysis for the key subsystem, wafer stage, is performed. Since the system is very complexity, the BDD (binary decision diagram) and DFTA (dynamic fault tree analysis) technique are introduced to make up the disadvantages of the traditional static FTA (fault tree analysis) method. Event “The kinematic...
Dynamic fault tree analysis method can be used to model and analyze reliability of complex engineering systems with dynamic failure characteristics. By incorporating the Bayesian Networks into dynamic fault tree method can alleviate the state space explosion problem involving in the latter. Based on Bayesian networks, a novel dynamic fault tree analysis method under fuzzy numbers is presented in this...
Fault tree analysis (FTA) is a popular methodology for system reliability analysis. The occurrence probability of the basic event is accurate in traditional fault tree (FT). Owe to the lack of the reliability data, especially in early design stage; a large amount of uncertainties may be included in FTA. In this study, the Dempster-Shafer (D-S) evidence theory is employed to quantify the uncertainty...
According to the necessity of reliability analysis for satellite system subjected to common-cause failures, the unreliability expression under a variety of common-cause condition is developed to analyze the unreliability of satellite system in this paper. Based on static fault tree analysis of satellite system, the binary decision diagram is used to evaluate the reliability considering common-cause...
Fuzzy fault tree analysis of uncontained event for aero-engine rotor is performed. The theory of fuzzy fault tree analysis was introduced firstly. Then the fault tree of uncontained event for aero-engine rotor is established, in which the descending method is used to find minimal cut sets. Further more, the interval representation and calculation strategy is presented when the symmetrical L-R type...
Maintainability analysis method combined with FMECA and FTA is proposed for the failure analysis of a type of diesel engine combustion system. Failure modes and cause analysis for this type of diesel engine combustion system are identified, and the hazard is analyzed. Finally, the real failure situation of this diesel engine is presented to validate the analysis results from the proposed method, which...
Ring-standby is a type of structure that has been used in complex systems with high reliability requirement. This paper presents a Monte Carlo based reliability evaluation method for this type of structure. The analysis results obtained from this method are compared with those from Markov and Dynamic Fault Tree (DFT) approaches. It is shown that the Monte Carlo simulation can yield additional useful...
System reliability modeling is one of the most important reliability modeling methods for satellite system. Based on the reliability characteristics of satellite system, we used reliability block diagram, fault tree, dynamic fault tree, Markov, and Monte Carlo modeling methods to build reliability models and summarize logic relationships of all kinds of modeling methods, the principle of choosing...
Accurate assessment of system reliability with limited or insufficient statistical data is difficult. This paper presents a method which overcomes the drawbacks of traditional fault tree analysis (FTA) by using FTA based on possibilistic measures and fuzzy logic. This method is designed specifically for situations wherein reliability and safety assessment is imprecise by nature and necessary statistical...
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