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Yang W.,Nankai University | Song Y.,Engineering Design and Research Institute of the Second Artillery Corps | Zhao X.,Nankai University
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

A virtual reality platform for space simulation was developed to simplify the implementation of weapon and based design. First, the architecture of the simulation system was described briefly; Second, based on the characteristics of space simulation platform, several key modules were introduced, including terrain real-time generation, analysis of space layout, and closest distance calculation. The terrain generation for space simulation platform was based on database management. The closest distance calculation was based on nearest neighbor k-d tree searching. In addition, a three-dimensional (3-D) model library, containing vehicles, test equipment, plant facilities, and other tools, was established for dynamic loading and planning. The simulation results show that the virtual reality system is robust, efficient, and realistic, which can meet the requirement of real time simulation of space planning and designing. © 2015, The Editorial Board of Journal of System Simulation. All right reserved. Source

Yang R.,Engineering Design and Research Institute of the Second Artillery Corps | Liu J.-H.,Beihang University | Li S.-M.,Beihang University
International Journal of Minerals, Metallurgy and Materials | Year: 2011

In-site regenerated titanium dioxide-activated carbon fibers (TiO 2-ACFs) photocatalyst was prepared by the sol-gel method. Detailed surface and structural characterization of the TiO2-ACFs photocatalyst was carried out. The photoactivity of TiO2-ACFs under ultraviolet irradiation was compared with original ACFs and pure TiO2 by the degradation of methylene blue aqueous solution. The degradation efficiency by the TiO2 (5wt%)-ACFs sample is much higher than that by TiO2 and ACFs. The results show that the photocatalysis by TiO 2-ACFs is a six-step process. The adsorption-transfer-photocatalysis rate of TiO2-ACFs is higher than the adsorption-photocatalysis rate of TiO2, so the photocatalysis rate of the TiO2-ACFs system is higher than that of TiO2 photocatalyst. © University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2011. Source

Zhang Y.,Nankai University | Fei Y.,Engineering Design and Research Institute of the Second Artillery Corps | Xu L.,Nankai University | Sun G.,Nankai University
Chinese Control Conference, CCC | Year: 2015

This paper presents the development of a low cost wireless real-time inertial body tracking system for virtual training. The system is designed to provide highly accurate human body motion capture and interactive three-dimensional (3-D) avatar steering, by combining low cost MEMS inertial measurement units (IMUs), wireless body sensor network (BSN), and Unity 3D virtual reality game engine. First, several wearable MEMS IMU sensors are placed on user's body and limbs according to human skeletal action, and each sensor performs a 9 degrees of freedom (DOF) tracking at a high-speed update rate. Second, a Zigbee-based BSN is designed to support up to 20 MEMS IMU sensor nodes data transmission at 50 Hz sampling frequency. All collected sensors' data are loaded to a Matlab-based PC program by means of serial port. In order to accurately estimate the local orientation of each IMU sensor, an optimized gradient descent algorithm is implemented. The algorithm uses a quaternion representation, which allows accelerometer and magnetometer data to be fused to compute the gyroscope measurement error as a quaternion derivative. Finally, the estimated orientation data by fusion algorithm are imported to a virtual environment, consisting of the 3-D virtual skeletal representation and the virtual scene for specific training. Experimental results indicate that the system achieves < 1 static RMS error and <2 dynamic RMS error. The systems further expand the usability of low cost body tracking solution to virtual training in virtual environments. © 2015 Technical Committee on Control Theory, Chinese Association of Automation. Source

Wu H.X.,PLA University of Science and Technology | Wu H.X.,Engineering Design and Research Institute of the Second Artillery Corps | Yue S.L.,PLA University of Science and Technology | Shi C.C.,PLA University of Science and Technology | Chu C.,PLA University of Science and Technology
Applied Mechanics and Materials | Year: 2013

In the deep rock mass surrounding, rock burst, large deformation, zonal fracturing and phenomena like these may occur in the tunnel excavation process. When zonal fracturing happens, it is essential to reconsider the types of support, the boundary of support and the approach of tunnel excavation. In this paper, the control theory about the surrounding rock stability under high pre-existing stresses was researched, and the efficient support form which was the combination of high strength anchor bar and anchor cable was ascertained to be adaptive to deep tunnel excavation. According to the deformation and zonal fracturing mechanism of the surrounding rock, a comprehensive support program that combined intensive short anchor bars and long anchor cables was established, and the numerical simulation was carried out to verify the feasibility of the support form. © (2013) Trans Tech Publications, Switzerland. Source

Fei Y.,Engineering Design and Research Institute of the Second Artillery Corps | Song Y.,Engineering Design and Research Institute of the Second Artillery Corps | Sun G.,Nankai University
2015 IEEE International Conference on Cyber Technology in Automation, Control and Intelligent Systems, IEEE-CYBER 2015 | Year: 2015

A simulation system for real-time closest distance searching is developed using GPU-based massive parallel computation technology. The system can be used for minimum distance detection between two three-dimensional (3-D) objects in a virtual environment. First, two 3-D models are converted into vertex/mesh format; then, CUDA-based GPU parallel computation is performed for the nearest neighbor searching, in order to find the closest separation Euler-distance of two objects; at last, Unity3D game engine is used as a testing platform for visualization. Experimental results indicate that the system not only works for arbitrary complex objects (i.e., non-convex object), but also has good real-time capability and high accuracy. Compared with traditional brute force algorithm, our parallel searching is about 50 times faster. © 2015 IEEE. Source

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