In this paper, a fault diagnosis method for spacecraft based on telemetry data mining and fault tree analysis was proposed. Decision trees are constructed from the history telemetry data of the spacecraft, and are used to classify the current data which is unknown whether it is fault. If there is a fault, the fault tree method will be used to analyze the fault reason and the impact on the spacecraft system. This method can effectively solve the problem of diagnostic knowledge acquisition. We design and construct a fault diagnosis expert system for spacecraft based on this diagnosis method. An experiment is presented to prove the effectiveness and practicality of the expert system.
Based on the analysis and the induction of electronic control fuel injection engine common failure which can't start, and according to the engine’s working principle and failure mechanism, established the electronic control fuel injection engine’s fault tree, and having made qualitative analysis about the working reliability of the engine by using the fault tree analysis method. This paper offered the electronic control fuel injection engine’s failure form which can’t start in classification, discussed the process of establishing the fault tree at length, even built and mapped the engine’s fault tree which can’t start; According to the natural gas compressor’s fault tree diagram, and applying the descending method to get the fault’s minimal cut sets. By making qualitative analysis, finding out the main influence factors of failure, and putting forward quite perfect methods of removing fault, which providing electronic fuel injection engine maintenance with the beneficial reference.
Make a tower calculation model according to the requirement, this paper using i-deas software the finite element analysis on it. According to given all kinds of tower under the condition of displacement field, stress field, the analysis process of tower adopts hexahedral and tetrahedral entity processing units mapping, analysis of the results using i-deas software in the post-processing module for data processing and graphical display
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