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The Fe-B alloy containing chromium and nickel was prepared, and the microstructure and erosion-corrosion behavior of the alloy were investigated by means of scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction analysis, Leica digital image analysis, a hardness tester and an erosion-corrosion tester. Cr28 white cast iron was used for comparison. Results show that the...
The microstructures and abrasion wear resistance of directional solidification Fe-B alloy have been investigated using optical microscopy, X-ray diffraction, scanning electron microscopy and laser scanning microscopy. The results show that the microstructure of as-cast Fe-B alloy consists of ferrite, pearlite and eutectic boride. After heat treatment, the microstructure is composed of boride and martensite...
Anomaly detection is to identify abnormal behaviors of a system. It plays an important role in Prognostics and System Health Management (PHM) which is applied to monitor spacecraft's performance, detect faults, identify the root cause of the fault, and predict the remaining useful life (RUL) in order to increase safety and reduce downtime of spacecraft in—orbit.
As the number of spacecraft growing and the spacecraft playing a significant role in many aspects, it is necessary to research the prognostics in order to find the spacecraft fault in advance. This paper puts forward a method of particle swarm optimized neural network used to realize prognostics for spacecraft considering the importance of prognostics in the field of PHM study. Firstly based on the...
This paper studies a real-time prediction method associated with the state and event of spacecraft in-orbit. The process includes the following steps: 1) Access the information about the parameter and state configuration related to the state and event of spacecraft, and construct the SERTS model (State-Event-Related-Time-Series model) of the changed parameters; 2) Select the parameters used to characterize...
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