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4,171 full-text articles. Page 122 of 207.

Fault Spatial-Temporal Detecting And Diagnosis For Power Grid Based On Wavelet Analysis, Li Gang, Pengcheng Xu, Longmei Han 2020 1. School of Control and Computer Engineering, North China Electric Power University, Baoding 071003, China; ;

Fault Spatial-Temporal Detecting And Diagnosis For Power Grid Based On Wavelet Analysis, Li Gang, Pengcheng Xu, Longmei Han

Journal of System Simulation

Abstract: The monitoring data of modern power system have strong intrinsic relationship and its abnormal and fault signal is often hidden in big data sets, so the traditional Fourier transform analysis methods don't have the ability of time domain localization analysis. A new method based on time-frequency characteristics of wavelet analysis was proposed for singularity detection of transient signals in power system, which through decomposing the multi-scale one-dimensional transient signal wavelet, extracted high frequency and low frequency coefficient, and got fault time information while the signal de-noising; then based on the singularity detection of modulus maxima, the fault location information …


Attitude Control Of Vtol Hexrotor Aircraft Based On Lyapunov Theory, Xuemin Yuan, Kecai Cao 2020 1. Nanjing University of Posts and Telecommunications, Nanjing 210023, China; ;

Attitude Control Of Vtol Hexrotor Aircraft Based On Lyapunov Theory, Xuemin Yuan, Kecai Cao

Journal of System Simulation

Abstract: The considered hexrotor is a symmetric VTOL-UAV with six rigid mono-directional propellers, and the interval between each propeller is 60°. In order to overcome the inherent geometric singularity of Euler angle description, quaternion representation was used to model. The effect of gyroscopic torques and reactive torques was taken into account when simplifying our model. An approach for hexrotor was proposed in which two nearly equivalent control laws were used to obtain asymptotic stability of attitude angles and attitude angular velocity of the hexrotor UAV. Simulation results emphasize the effectiveness of the proposed control scheme.


Optimized Composite Input Shaping Based On Residual Oscillation Suppressing, Huasen Liu, Wenming Cheng 2020 Research Institute of Mechanical Engineering; Southwest Jiaotong University, Chengdu 610031, China;

Optimized Composite Input Shaping Based On Residual Oscillation Suppressing, Huasen Liu, Wenming Cheng

Journal of System Simulation

Abstract: The optimized input shaping control method was proposed to reduce the under actuated overhead crane’s oscillation caused via the inertia force. The dynamic model of the overhead crane was proposed according to the physics structure of the crane. The probability distribution function of the crane’s swing frequency was obtained. The optimized multi-model composite based on the probability distribution function of the crane’s swing frequency was used as the feed-forward input to increase the frequency of robustness. Simulation results indicate that the optimized multi-model composite input shaping can reduce the oscillation the overhead crane.


Modeling And Quaternion Control Of X-Type Quadrotor, Shaobin Ding, Changshi Xiao, Jingen Liu, Yuanqiao Wen 2020 1. Hubei Inland Shipping Technology Key Laboratory, Wuhan 430063, China; ;2. Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, School of Information Engineering,Wuhan University of Technology, Wuhan 430070, China;

Modeling And Quaternion Control Of X-Type Quadrotor, Shaobin Ding, Changshi Xiao, Jingen Liu, Yuanqiao Wen

Journal of System Simulation

Abstract: A comprehensive dynamic model of X-type quadrotor was established and simulated. Different from other widely used models that usually treated quadrotor as a single-rigid-body system, the rotors, propellers and the aircraft body were treated as a multi-rigid-body system in the proposed model. The 3D model wireframe was constructed using Solidworks and the important inertial parameters were extracted from the design data. Two types of multi-channel-double-loop vector PD flight controller were designed and fine tuned, one was based on quaternion feedback and the other was based on Euler angle feedback. The close-loop systems were simulated on Matlab/Simulink. The simulation results …


Research On Bifurcation Of A Class Of Cortical Eeg Model With Time Delay, Chunsheng Li, Zhang Xue 2020 1. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China; ;

Research On Bifurcation Of A Class Of Cortical Eeg Model With Time Delay, Chunsheng Li, Zhang Xue

Journal of System Simulation

Abstract: The bifurcation characters of a cortical-model with bidirectional time delays were studied, proposed by Robinson, et al. before. Considering transmitting delay between excitatory and inhibitory populations, the stability, bifurcation characters and bifurcation region were achieved. The relationship of cortical potential spectrum density and transmit delay was analyzed when white noise was introduced. Result shows that time delay between different population acts as an important role of model’s dynamic characters and stability, and numerical simulation verifies the theoretical analysis. This research shows the importance of transmit delay in cortical-model, and provides theoretical illustration for further research of epileptic …


Pinning Control For Synchronization Of Hr Biological Neural Networks:Linear Active Disturbance Rejection Approach, Wei Wei, Wen Jiao 2020 School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China;

Pinning Control For Synchronization Of Hr Biological Neural Networks:Linear Active Disturbance Rejection Approach, Wei Wei, Wen Jiao

Journal of System Simulation

Abstract: Synchronization of a complex network whose nodes are Hindmarsh-Rose biological neurons was considered. Coupling strengths of the whole network were always taken as the tuning variables. However, coupling strengths may not be changeable. In addition, synchronization was affected by different disturbances. In view of above factors, pinning control was utilized and linear active disturbance rejection control (LADRC) was designed. By this approach, synchronization was achieved in according to synchronization errors of the controlled nodes and the couplings among nodes. In the simulations, coupling strength was fixed at a relative small value, and no external disturbance case …


Optimization Model Of Cis Network Architecture Based On Information Flow, Jianhua Li, Junwei Zhao 2020 School of Information and Navigation Air Force Engineering University, Xi’an 710077, China;

Optimization Model Of Cis Network Architecture Based On Information Flow, Jianhua Li, Junwei Zhao

Journal of System Simulation

Abstract: In order to explore the internal relationship between Command Information System (CIS) network and combat system, a layered combat system model was built, including organizational relationship layer, information interaction layer and communication link layer. Conception of the system coupling intensity was defined, which reflected the influence of network architecture to combat system. An optimization model of CIS network architecture aimed at maximizing the ratio of system coupling intensity to cost coefficient was built. A route programming genetic algorithm was designed and applied into simulation of Air Offensive Campaign (AOC) system network. The results show that the model and algorithm …


Research On Damage Ratio Considering Target-Location Error, Xieen Song, Weidong Song, Ma Qian 2020 1. The Artillery Engineering Department, Ordnance Engineering College, Shijiazhuang 050003, China; ;

Research On Damage Ratio Considering Target-Location Error, Xieen Song, Weidong Song, Ma Qian

Journal of System Simulation

Abstract: Different computing methods for target-location error have much influence on the result of cluster target damage ratio. In order to find a suitable method, based on existing damage ratio analytical method and error combination method, several new ideas, such as error synthesis method, random target method, were proposed. By analyzing specific examples and comparing the results, the accuracy and application conditions for each method were reached. Random target method was proved to be the best on the whole; error combination method was optimal when it could meet the conditions of analytical method and data error combination; target-location …


Simulation On Spontaneous Combustion Of Goaf Under “U” Type Ventilation And Improvement, Tiejun Cui, Yundong Ma, Laigui Wang 2020 1. College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China; ;2. Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Fuxin Liaoning 123000, China; ;3. Tunnel & Underground Structure Engineering Center of Liaoning, Dalian Jiaotong University, Dalian 116028, China; ;

Simulation On Spontaneous Combustion Of Goaf Under “U” Type Ventilation And Improvement, Tiejun Cui, Yundong Ma, Laigui Wang

Journal of System Simulation

Abstract: To understand the change of temperature and heating area, in different time, in the process of spontaneous combustion of goaf under “U” type ventilation, the model was proposed based on the theory of particle flow. The three basic problems of Oxygen equivalent flow and reaction with the coal were solved, and implemented with FISH. According to the actual working condition, the heating process was simulated, which could be divided into three stages, and the characteristics of the six warming development time were analyzed, finding that the heating area change was related with the oxygen flow in the process of …


Modeling And Simulation On Influence Of Complex Network Nodes Based On Data Field In, Chenxi Shao, Xiaoqi Chen, Xingfu Wang, Fuyou Miao 2020 School of Computer Science and Technology of University of Science and Technology of China, Hefei 230022, China;

Modeling And Simulation On Influence Of Complex Network Nodes Based On Data Field In, Chenxi Shao, Xiaoqi Chen, Xingfu Wang, Fuyou Miao

Journal of System Simulation

Abstract: Research on the influence of complex network nodes is an important part of data mining. Mining the influential nodes in complex networks not only has important academic significance, but also helps to suppress the outbreak of epidemics, control the spread of rumors, and promote e-commercial products and so on. By selecting the Mixed Degree Decomposition (MDD) value of each node as its mass, the complex network is abstracted into a data field, the influential nodes are identified by combining the data field model, and some well-known centralities are compares with. The classical Susceptible-Infected-Recovered (SIR) epidemic model is …


Foot Measurement Based On Deep Alignment Network, Shi Min, Hanqin Yao, Chunpeng Li, Liangchen Chen 2020 1. School of Control and Computer Engineering, North China Electric Power University, Beijing 102206,China;;

Foot Measurement Based On Deep Alignment Network, Shi Min, Hanqin Yao, Chunpeng Li, Liangchen Chen

Journal of System Simulation

Abstract: Foot measurement plays an important role in many areas. Limited by equipment and algorithms, three-dimensional foot measurement cannot make a convenient and quick foot measurement. A method is proposed by combining the image measurement with the deep neural network. Based on the physiological structure analysis of foot, key points are extracted and the measurement parameters are defined. During the key point detection of foot, the activation function and loss function of DAN (Deep Alignment Network) model is optimized, and a data acquisition method is defined based on the handheld camera. Foot key points are detected, and main parameters are …


Mobile-Phone-Oriented Stereoscopic Display And Interaction Framework For Cloud-Based Virtual Reality 3d Scenes, Jiazhe Liu, Chunyi Chen, Xiaojuan Hu, Weidong Liang, Qiwei Xing, Huamin Yang 2020 School of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China;

Mobile-Phone-Oriented Stereoscopic Display And Interaction Framework For Cloud-Based Virtual Reality 3d Scenes, Jiazhe Liu, Chunyi Chen, Xiaojuan Hu, Weidong Liang, Qiwei Xing, Huamin Yang

Journal of System Simulation

Abstract: A VR application framework based on cloud computing is proposed to overcome the difficulty of interactively generating high quality 3D scene images on mobile phones. We combine the cloud-based rendering and the VR technology. Our framework uses a mobile browser as a client, transmits the image data by the video block stream, processes the interactive data by the anti-jitter algorithm, and has accomplished the web-based lightweight rendering. The framework reduces the cost of data visualization on mobile phone and avoids the need of installing a plug-in package. The experimental results show that our display rate could be improved to …


Maintenance Operation Control Of Virtual Human In Collaborative Virtual Maintenance, Liang Feng, Zhili Zhang, Xiangyang Li 2020 Rocket Force University of Engineering, Xi'an 710025, China;

Maintenance Operation Control Of Virtual Human In Collaborative Virtual Maintenance, Liang Feng, Zhili Zhang, Xiangyang Li

Journal of System Simulation

Abstract: Aiming at the operators being not able to move freely in the limited capture area of optical motion capture devices, the maintenance operation control of virtual human in Collaborative Virtual Maintenance is studied. The lower limb action of operators is captured by the optical motion capture devices, and the wide range motion of the virtual human is controlled according to the real-time recognition results. In order to control the hand motion process of the virtual human in the maintenance operation, the hand interaction of the virtual human is analyzed and an intelligent assistant method for the maintenance operations based …


Simulation Research On Cooperative Control Of Multi Intelligent Ground Platform Based On Agent Theory, Yunrong Zhang, Zhili Zhang, XiangYang Li, Hongguang Wang, Wenpeng Mi, Xiangtong Kong, Pengpeng Liu 2020 1. Rocket Sergeant School, Qingzhou 262500, China;;

Simulation Research On Cooperative Control Of Multi Intelligent Ground Platform Based On Agent Theory, Yunrong Zhang, Zhili Zhang, Xiangyang Li, Hongguang Wang, Wenpeng Mi, Xiangtong Kong, Pengpeng Liu

Journal of System Simulation

Abstract: In order to improve the cooperative control ability of the multi Intelligent ground platform and to adapt to the trend of intelligent war in the new situation, a multi intelligent ground platform cooperative Control simulation system based on jade and world wind Java is constructed. Based on multi-agent theory, the simulation model of intelligent ground platform is build. Based on JADE, the cooperative Control simulation platform is constructed. The task allocation mechanism is optimized by the particle swarm optimization algorithm. The simulation results show that the cooperative Control simulation platform has good robustness and flexibility. The optimized task allocation …


A Survey On Visual Slam Based On Deep Learning, Ruijun Liu, Xiangshang Wang, Zhang Chen, Bohua Zhang 2020 Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China;

A Survey On Visual Slam Based On Deep Learning, Ruijun Liu, Xiangshang Wang, Zhang Chen, Bohua Zhang

Journal of System Simulation

Abstract: Following the development of computer vision and robotics, visual Simultaneous Localization and Mapping becomes a research focus in the field of unmanned systems. The powerful advantages of deep learning in the image processing offer a huge opportunity to the wide combination of the two fields. The outstanding research achievements of deep learning combined with visual odometry, loop closure detection and semantic Simultaneous Localization and Mapping are summarized. A comparison between the traditional algorithm and method based on deep learning is carried out. The development direction of visual Simultaneous Localization and Mapping based on deep learning is …


Visual Tracking And Localization Based On Confidence Evaluation Of Adjacent Targets, Youquan Liu, Pei Xue, Li Wan, Zhengxiong Liu 2020 1. School of information Engineering, Chang'an University, Xi'an 710064, China;;

Visual Tracking And Localization Based On Confidence Evaluation Of Adjacent Targets, Youquan Liu, Pei Xue, Li Wan, Zhengxiong Liu

Journal of System Simulation

Abstract: In visual target tracking and localization, the target could not be located due to the lack of features or the severe occlusion. Aiming at this, an algorithm based on confidence evaluation of neighboring targets is designed. In the tracking process, by detecting and extracting the marker features of neighboring targets, and combining the Hamming distance of each feature marker and the normalized result with respect to other markers as well as the probability of occurrence of each marker, the final confidence of each marker is obtained. The marker with the maximum confidence is to used determine the target …


Simulation Of Dongba Art Style Painting, Wenhua Qian, Xu Dan, Xu Jin, He Lei, Zhang Bo 2020 1. Department of Computer Science and Engineering, Yunnan University, Kunming 650504, China;;

Simulation Of Dongba Art Style Painting, Wenhua Qian, Xu Dan, Xu Jin, He Lei, Zhang Bo

Journal of System Simulation

Abstract: An interactive technique that can generate the Dongba art paintings from 2D images is proposed. A Dongba painting line drawing system is designed and developed which adopts the interactive selection method to obtain the smooth and continuous line drawings. To produce the foreground image of the Dongba styles, a multi-frequency noise integral convolution algorithm is utilized to simulate the block texture color of the Dongba paintings. Texture synthesis algorithm is used to generate the image of large sizes from samples to simulate the background image. Based on the layer-mapping technique and local color transmission methods, the final artistic style …


Mrmark: A Machine Performance Evaluation Method For Three-Dimensional Video Fusion, Yifei Sun, Liangliang Cai, Zhou Yi, Zhou Zhong 2020 1. State Key Laboratory of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China;;2. Beijing Bigview Technology Co., Ltd, Beijing 100088, China;

Mrmark: A Machine Performance Evaluation Method For Three-Dimensional Video Fusion, Yifei Sun, Liangliang Cai, Zhou Yi, Zhou Zhong

Journal of System Simulation

Abstract: The three-dimensional video fusion system needs the calculation of video and graphics, and requires high machine performance. The existing commercial evaluation tools lack the corresponding considerations, which may cause the inconsistency of a machine's performance from the score. A machine performance evaluation method for three-dimensional video fusion is proposed and an evaluation tool MRMark is implemented. Several sets of standard 3D test scenes are designed according to the characteristics of the video fusion system, the statistics on the frame rate, the number of video channels played and the other parameters during the test are collected to calculate the …


Research On Highway Bim Perception And Engineering Evaluation Based On Virtual Reality, Zhaohui Wu, Zhiqiang Fu, Wang Liang, Dou Fei 2020 China Academy of Transportation Sciences, Beijing 100029, China;

Research On Highway Bim Perception And Engineering Evaluation Based On Virtual Reality, Zhaohui Wu, Zhiqiang Fu, Wang Liang, Dou Fei

Journal of System Simulation

Abstract: Virtual reality technology is a new way for the highway BIM to upgrade from 2D to 3D. Based on the analysis of the characteristics of highway engineering and the travel needs of traffic participants, five methods are proposed to perceive highway BIM and evaluate the engineering design results of different road users, including virtual driving, virtual flight, virtual riding, virtual walking and augmented reality. These methods provide technical and tool support for the people-oriented road BIM perception, engineering evaluation, collaborative work, and design optimization. The experiment tests show that virtual reality connects the BIM models with human perception, …


Icp Optimized B-Spline Non-Rigid Registration For 4d-Ct Images, Wenjie Tang, Ruotong Li, Xuesong Deng, Weixin Si, Wang Qiong 2020 1. Wu Han University of Technology, Wuhan 430070, China;;2. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen 518500, China;;

Icp Optimized B-Spline Non-Rigid Registration For 4d-Ct Images, Wenjie Tang, Ruotong Li, Xuesong Deng, Weixin Si, Wang Qiong

Journal of System Simulation

Abstract: In order to improve the accuracy and speed of registration between two groups of 4D-CT images under different physiological activities, based on FFD model of multi-resolution B-spline, a registration algorithm using ICP to optimize the model is proposed. The ICP algorithm is added before the traditional b-spline to realize the point cloud registration between two groups of 4D-CT images: the appropriate model is generated from the two segmented groups of 4D-CT images, then the two groups of point clouds in the model are registered with ICP. The improvement rates of similarity measurement at level 1, level 2 and …


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