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《Application of Empirical Mode Decomposition Method in spacecraft Fault Diagnosis》

CHEN Ting-yan;JING Jian-ping;CHEN Tie-feng;JIN Chang-ming

2010, 30 (4): 76-80. DOI: 10.3969/j.issn.1006-1355.2010.04.021

Abstract （1960）

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Independent fault diagnosis for orbited spacecraft in real time is always the bottleneck in the development of aerospace engineering. In this paper, the empirical mode decomposition (EMD) is employed for fault diagnosis of moving component parts of spacecrafts. The stepout fault characteristic is extracted effectively and the base frequency is obtained. This method provides with the basis for fault diagnosis of orbited spacecrafts under the blackbox condition. In addition, in comparison with FFT and wavelet analysis, it is found that the EMD method is more efficient and advanced in the fault diagnosis of moving component parts of spacecrafts.

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《Analysis of Fluidconveying Pipe with Transfer Matrix Method》

JIN Chang-ming;WANG Gan-cheng;GAO Kang;CHEN Ting-yan;LI Hong-guang

2009, 29 (6): 30-33. DOI: 10.3969/j.issn.1006-1355.2009.06.030

Abstract （2939）

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The transfer matrices of the axial, flexible and torsional modes of fluidconveying elbow pipe are deduced considering fluidstructure interaction between pipe and fluid. Calculate the modal frequency and shape of a “U” shape pipe with Transfer Matrix Method and ANSYS software respectively. The results indicate that Transfer Matrix Method is an effective way to analyze fluidconveying pipe. The effect of fluidstructure interaction can not be ignored which will depress the modal frequency of the pipe.