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Shi X.,Shenyang Aerospace University | Shi X.,Liaoning University | Zhang J.,Liaoning University | Dai Q.,Shenyang Institute of Engineering | And 2 more authors.
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2016

This paper addresses the tracking drift problem in deformable target tracking, which is caused by the target segmentation and modeling with color features. To this end, we propose a novel tracking method based on saliency segmentation and target detection. We utilize graph-based manifold ranking to obtain salient and high-quality target pixels, and quantify these pixels by color and gradient. Then, the quantized values of target pixels and the relative position to the center of the target are used to represent the target model, which is used for tracking target by detecting the target center. A drifted constraint based on the global color features is used to correct the central position drift caused by the continuously deforming the target. Moreover, the tracking results are adopted as the constraints of saliency segmentation and global color features, and the target model is updated according to the segmentation results. The experimental results demonstrate that the proposed method is able to improve the precision and stability for deformable target tracking. © 2016, Institute of Computing Technology. All right reserved. Source

Wang G.,Liaoning General Aviation Academy | Wang G.,Shenyang Aerospace University | Chen H.,Shenyang Aerospace University | Lv S.,Shenyang Aerospace University | And 2 more authors.
Journal of Reinforced Plastics and Composites | Year: 2015

A new fractal model for predicting the permeability of satin fabrics is proposed mainly based on the fractal theory. The repetitive unit was selected first according to the structural characteristic of a fabric. Then, the tortuosity fractal dimension was figured out after the actual length of a pore channel calculated by the minimum potential energy method. The maximum equivalent diameter, on which the structure fractal dimension can be computed depends, was obtained later by the microscopic measurement technique. Subsequently, the permeability was expressed as the explicit equation of various structural parameters, such as the representative length, the tortuosity fractal dimension, and the structure fractal dimension, which makes the physical meanings of each parameter intuitive and clear. Finally, the permeability of a five-harness fabric and an eight-harness fabric was predicted according to the new fractal models. In order to validate the new model, contrast experiments were designed. The results show that the predicted values agree well with the experimental values, which illustrate that the new method is feasible and effective. © The Author(s) 2015 Source

Xiang S.,Shenyang Aerospace University | Xiang S.,Liaoning General Aviation Academy | Li G.-C.,Shenyang Aerospace University | Zhang W.,Shenyang Aerospace University | Yang M.-S.,Shenyang Aerospace University
Applied Mathematics and Mechanics (English Edition) | Year: 2012

Love's first approximation theory is used to analyze the natural frequencies of rotating functionally graded cylindrical shells. To verify the validity of the present method, the natural frequencies of the simply supported non-rotating isotropic cylindrical shell and the functionally graded cylindrical shell are compared with available published results. Good agreement is obtained. The effects of the power law index, the wave numbers along the x- and θ-directions, and the thickness-to-radius ratio on the natural frequencies of the simply supported rotating functionally graded cylindrical shell are investigated by several numerical examples. It is found that the fundamental frequencies of the backward waves increase with the increasing rotating speed, the fundamental frequencies of the forward waves decrease with the increasing rotating speed, and the forward and backward waves frequencies increase with the increasing thickness-to-radius ratio. © 2012 Shanghai University and Springer-Verlag Berlin Heidelberg. Source

Xiang S.,Shenyang Aerospace University | Xiang S.,Liaoning General Aviation Academy | Chen Y.-T.,Shenyang Aerospace University
Gongcheng Lixue/Engineering Mechanics | Year: 2013

Three-dimensional governing differential equations are derived based on the linear elasticity theory and the equations are discretized using the meshless collocation method based on the inverse multiquadrics radial basis function. Through the numerical examples, the convergence characteristics and the choice of shape parameter are studied. It is found that the natural frequencies computed with shape parameter c=0.5/√Nx (Nx is the number of node at the x side) converge most rapidly. The natural frequencies of orthotropic and isotropic plates under different boundary conditions are calculated by the proposed method. The proposed results are in good agreement with the available published results. Source

Lin F.,Shenyang Aerospace University | Li H.,Shenyang Aerospace University | Zhang X.,Shenyang Aerospace University | Zhang X.,Liaoning General Aviation Academy
International Conference on Signal Processing Proceedings, ICSP | Year: 2015

A model of solar radiation intensity is established which can help analysis the issue better, because the UAV has a tall order in weight control and yet it consumes much electricity. By using MATLAB, the mode can simulate the solar cell's output power during the daylight well and in this way proved that the solar panel can give sufficient power for the testing UAV. To ensure the UAV can work without faults, a monitoring system is developed to monitor the power supplied by solar panel and the built-in battery. The following test also shows that the system can work properly and have a satisfying accuracy. The energy monitoring system measures and displays for energy system data, and provides the first data when a small solar unmanned demonstrator flies in the test process. © 2014 IEEE. Source

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