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Using Cu-coated carbon fiber cloth (CFC) as reinforcement and Ti-6Al-4V (TC4) as matrix, the Cu-coated CFC/TC4 composite was fabricated by spark plasma sintering. The interface morphology, phase microstructure, phase distribution and mechanical properties of CFC/TC4 were characterized. Results show that carbon fibers are uniformly distributed in Cu-coated CFC/TC4. CuTi, Cu and trace TiC are distributed...
An efficient graph-based method to analyze fault propagation characteristics in the complex electronic systems is proposed. Firstly, two test node selection methods are proposed to meet different level of diagnosis requirements, and a greedy algorithm is applied to find the best test nodes. Then, a fault propagation characteristics analysis model based on hierarchical signed directed graph is established,...
Intelligent prosthesis is an important component of rehabilitation medicine works, and it plays a decisive role in people's lives. In order to reduce the unnecessary material and time-consuming, and improve design efficiency in the actual prosthetics physical prototype design process, this paper proposes a solution that studying virtual bionic hands in mechanical virtual prototyping, Adams software,...
In this paper, three experiments were conducted about the extension/flexion movements of the index finger at two speeds 0.4Hz and 0.8Hz of the 10 subjects. AR coefficients of sEMG signals were used as the feature parameters fed into the fuzzy neural network. The motion direction identification, fixed finger joint angle recognition and trajectory forecast are implemented in this study. The experimental...
In nowadays, fault diagnosis method for analog circuit based on support vector machines, has become a hot topic in research field of fault diagnosis. However, in practical application of this method, the imbalanced problem occurred in fault sample dataset has greatly influenced its effectiveness. To remedy this problem, this paper proposed an improved Support Vector Machines method based on biased...
Analog circuit fault diagnosis problem can be modeled as a pattern recognition problem and solved by machine learning algorithm. SVM is often chosen as the learning machine because of its good generalization ability in small sample decision problem. However, in practical applications, because the fault samples are hard to acquire, the number of fault sample is far less than that for normal samples,...
In designing the routing protocols for wireless sensor networks, clustering is one of the methods used to manage network energy consumption efficiently. LEACH is one of the most famous clustering mechanisms. It elects a cluster head based on probability model. This approach may reduce the network lifetime because LEACH does not consider the energy remains of each node. In this paper, we present an...
This paper proposes a nonuniform-bandwidth onboard channelizing and switching architecture for broadband satellite communications. Detailed simulations are carried out to explicitly verify the flexibility and scalability of the proposed architecture. Significant performance improvement and reduction in memory size have been demonstrated, making the digital channelization technique attractive for future...
With the wide application of modern electrical technique to weapon systems, weapons become more and more complicated, integrated, high-speed and intellectualized. To insure weapons in their good conditions, the function of fault diagnosis gets more important than before in the process of repairing. Now, it cannot give fault diagnosis quickly and correctly only by conventional means. So developing...
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