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According to the AE (Acoustic Emission, AE) signal that caused by the aircraft structural crack, this paper proposed a health diagnosis approach based on ARMA model and SVM (Support Vector Machine, SVM). Firstly, this method apperceives the healthy information of a real aircraft stabilizer with real time by using AE detecting system. And then, deal with the information collected. Secondly, built an...
To monitor effectively the aerocraft structure fatigue damages, discover in good time hidden trouble, avoid fearful accident occurring, the advanced acoustic emission (AE) technology is used to monitor the aerocraft structure health state. The variance of the wavelet packet decomposition coefficients to the gathered AE signals are extracted as the aerocraft structure robust health state feature vectors...
For the problem that aviation generator lifetime prognostics is difficult, this paper proposes a prognostics method for aviation generator lifetime based on grey theory. A real military aviation generator is tested to obtain a large number of lifetime data. After the analysis about the military aviation generator lifetime data, the paper uses grey theory to design two models of aviation generator...
During the study of aircraft key components' performance, for achieving high efficient and low-cost simulation verification, it's needed to simulate the flight attitude under different tasks. The visual simulation technology based on flight attitude has been one of the hot topics of current research. In order to design the Aircraft Integrated Health Management System, visual simulation models of horizontal...
As the health status of aeroplane structural components has direct influence on the flight safety, it is important to monitor the health status of structural components timely. In this paper, acoustic emission technology is used to monitor the health status of the aeroplane structural component. The acoustic emission health information from the aeroplane structural component is analyzed and disposed...
The research of aeroplane structure fatigue life prediction has the important military significance and the conspicuous economic value. In this paper, the specific object of research is the pivotal aeroplane structural component-aeroplane stabilizer. Through the analysis of the aeroplane stabilizer stress, the mathematical model of fatigue crack was established in the paper. Take advantage of the...
In this paper, GM (l, 1) model in gray system theory is used to predict the weeks closing price on the Shanghai and Shenzhen 300 Index fell more than 2.5% and the months closing price fell more than 10%. The results showed that the accuracy of predictive value met the requirements and it indicates that the model can be used for the disaster forecast for the Shanghai and Shenzhen index in long-term...
The tracking of the weak aerial target (WAT) is very important for the air action. The missing of WAT is often occurrence due to the barrier in the sky. A new method for WAT based on the grey model is proposed to improve the tracking ability, when there is some temporary barrier in front of the target in the sky. The GM theory is used to forecast the position of the instantaneous missing target by...
To diagnose effectively the aerocraft key structure components fatigue damages, discover in good time hidden trouble, avoid fearful accident occurring, the advanced acoustic emission (AE) technique is used to monitor the aerocraft stabilizer health state and get the AE information. Chaos theory is used to extract the correlation dimension of the AE information and construct the character vector. And...
The aerial robotic visual servo system is in fact a feedback control system by visual information. When aerial robotic autonomous landing and tracking target, the servo system obtains control parameters on the basis of the target feature extraction and then sent out corresponding instructions. According to the problem of the identification of landing point, this article comprehensive uses the methods...
A cell-to-cell fusion technique using 3-D microelectrodes array microchip has been developed. It permits cell-to-cell fusion operation in large amount simultaneously. And it needs much lower voltage (alternating voltage and pulse voltage) than the conventional cell fusion techniques. An array of 16 (4times4) microelectrodes can be fabricated on a 1times1cm silicon wafer. And an experimental system,...
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