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Research related to the effect of roughness on the sealing performance was reviewed, and the orientation effect of a microstructure with orderly roughness was introduced to improve the performance of dry gas seal. A microstructure was established for the flow field of dry gas film in a pair of seals. The results showed that the microstructure improves the opening performance while maintaining a reasonable...
Quad-rotor helicopter is a popular platform for unmanned aerial vehicle (UAV) research due to its simplicity of structure and maintenance as well as the capability of hovering and vertical take-off and landing. The attitude controller is of great importance since it ensures the vehicle to keep balance and perform the desired maneuver. In this paper, sliding mode controller for attitude regulation...
In this paper, to solve the problems that matching an image through the SURF (Speeded Up Robust Features) algorithm spends too much time, a novel image matching algorithm to improve surf will be introduced. While surf is known to be strong but computationally still expensive, it has not attained real-time performance yet. Thus this algorithm is based on the heavily modified SURF feature descriptors...
A motion simulator of deep-sea mining ship is designed for the 6000m deep-sea poly-metallic mining system, the control methods and the performance of the simulator are researched and tested. PID control is chosen. To determine PID control parameters, mathematical model of valve controlled cylinder system is established and validated by simulation tests. Based on the mathematical model, PID control...
AFDX is a new generation network system of airborne devices. It is superior to use the simulation technology of network to research the real-time and deterministic performance in the AFDX system. For realizing the simulation of AFDX system, the simulation model of AFDX system should be built at first. Therefore, modeling has become the core issue about the simulation of AFDX system. After briefly...
The AFDX (Avionics Full DupleX Switched Ethernet) network simulation is an effective tool for AFDX network technology and performance research. Based on the established AFDX end system, switch and virtual link simulation models, the AFDX network simulation system is implemented on NS2 (Network Simulation 2) network simulation platform. The key algorithm of each simulation model is designed in detail...
This paper developed a pipeline leak detection system based on virtual instrument LabVIEW and described the system principle, composition structure and development progress in detail. The pipeline leak detection system acquired pressure and flow at two ends of the pipeline real time, analyzed data by wavelet analysis functions offered by LabVIEW, detected leak through flow changes and located leak...
In order to speed up support vector classification, a novel algorithm by the names of SVM Decision Tree is proposed in this paper. In the decision tree, several linear SVM are constructed which can achieve the highest detection rate on the negative samples, the negative samples which can be correctly classified by the hyperplane are removed from the original samples, and train one nonlinear SVM using...
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