Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor,
2020
Engineering Research Center of Internet of Things Technology Applications Ministry of Education, Jiangnan University, Wuxi 214122, China;
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: With the aim of improving the performance of the vector controlled induction motor system, a novel control method which combines variable structure PID speed control with online identification of rotor resistance based on model reference adaptive system (MRAS) is proposed. The rotor resistance is identified by self-adaptive adjustment in the model reference adaptive system based on the instantaneous reactive power. Given that the parameters can not change on line and the integral saturation phenomenon often exists in traditional PID speed regulator, a variable structure PID speed controller is designed by integrating anti-windup technology with fuzzy theory based on traditional …
Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks,
2020
1. 3 JiLing University of Tech., Najing 211106, China, China;;
Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks, Su Cheng, Wentong Wang, Shibao Yang, Xv Linlin, Xinan Tang
Journal of System Simulation
Abstract: Defenses approach against DDoS(Distributed Denial of Service) attacks is currently an important hot issues. We propose a new efficient defenses approach which adopts a detection system based on metadata analysis to identify the packages of DDoS attacks. The flow control rules are formed based on the summarized experience data. ACL (Access Control List) is applied through inline devices (firewalls and load balancers) or divider to limit rate, clean flow or drop package. 10Gbps bandwidth HTTP requests, which contain malicious DDoS attacks packages, can be detected and cleaned completely in line-rate speed. We especially summarize th traffic characteristics …
Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr,
2020
1. Changchun University of Science and Technology, Changchun 130000, China;;
Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr, Weixin Zheng, Jinyuan Jia
Journal of System Simulation
Abstract: Considering the weak rendering ability of web browser, the authenticity and aesthetics of Web3D rendering are always hot topics.In particular, the realization of PBR in the web-side and even dynamic editable are difficult.The realization and dynamic edit of PBR in the web end are especially difficult. Based on the problem mentioned, this paper presents a web-based lightweight real-time rendering algorithm with authenticity and high quality based on the PBR algorithm, which simplifies the complex calculation steps of the algorithm and reduces the computational complexity for rendering. The LPM (Lightweight Progressive Mesh) algorithm is reused to simplify the model file …
Two Image Watermarkingmethodsbased On Compressive Sensing,
2020
Hangzhou Institute of Service Engineering, Hangzhou Normal University, Hangzhou 311121, China;
Two Image Watermarkingmethodsbased On Compressive Sensing, Yidi Miao, Lü Ju, Xiumei Li
Journal of System Simulation
Abstract: As an emerging sample theory, compressive sensing attracts wide attention because it breaks through the Nyquist sampling theorem. , Two different methods of watermark embedding and extraction are presented by measuring the carrier image and watermark image respectively based on compressive sensing. Moreover, the attack tests, such as the Gaussian noise, pepper and salt noise, filtering, compression, and cropping, are implemented to watermarked images. Experiment results show that although the two different methods for image watermarking have different processing procedure, both can guarantee the robustness and security of embedded digital watermark.
Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid,
2020
Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, China;
Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid, Bingchuan Jiang, Wan Gang, Li Feng, Zhang Wei, Zhenfa Yang
Journal of System Simulation
Abstract: According to the requirements of specific application of robotic localization and navigation, a spatial modeling method of the robotic navigation map with ultra-high resolution volumetric grid model is proposed. The geographic spatial three-dimensional grid model is combined with the robotic navigation map and the consistency of spatial span, grid cell and data organization is analyzed. The characteristics of the robotic navigation map, the source and classification of the data, and the difference and relationship between SLAM are analyzed in detail. The robotic spatial data sets are discretized with the ultra-high resolution volumetric grid units as the data organization units. …
Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle,
2020
Hebei Engineering Research Center of Simulation & Optimized Control for Power Generation (North China Electric Power University), Baoding 071003, China;
Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle, Han Pu, Ting Zhang
Journal of System Simulation
Abstract: A multiple model predictive control strategy based on offline linear model is proposed for controlling the ORC-based WHRSs (waste heat recovery systems). The proposed control strategy is described for a wide operation region of the ORC system. A switching mechanism considering both instant output errors of each model and error accumulation is applied for the switch of local controllers in different operation regimes. Simulation results demonstrate that the proposed method can effectively regulate the evaporating pressure and the superheating temperature for the ORC-based WHRS throughout a wide operation region.
Bi-Layered Network Model Of Command Information System Based On Task Flow,
2020
1. Information and Navigation College, Air Force Engineering University, Xi'an 710077, China;;
Bi-Layered Network Model Of Command Information System Based On Task Flow, Cui Qiong, Jianhua Li, Haodan Ran, Mingli Nan
Journal of System Simulation
Abstract: As the monolayer and static network model can not reflect the hiberarchy and task property of command information system, a bi-layered network model of command information system based on task flow is established. The dynamic operation mechanism and layered network structure are descripted on the basis of task、structure and function of the system. The bi-layered network consisting of communication network and function network is defined based on the task property and layered network theory. The simulation takes the joint air defense operation command information system as an example and the results demonstrate the effectiveness of the model. The proposed …
Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method,
2020
School of mechanical engineering, Hebei University of Technology, Tianjin 300130, China;
Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method, Yuanfei Zhu, Sixiang Zhang, Zhou Wei, Xiaochen Wang, Zhidong Li
Journal of System Simulation
Abstract: In order to accurately segment the multi-objective image whose objective area is too small, and the background gray value is similar to the objective, a threshold segmentation algorithm based on statistical curve difference method is proposed. The mountain model of multi-objective gray image is established and the gray image is normalized. The number of connected area is counted by threshold division. The statistical curve is plotted with the horizontal coordinate being the gray level with equal interval, and the vertical coordinate being the counting result. The threshold point is the point where the difference value of the statistical …
Survey On Parallel Collision Detection Algorithms,
2020
Digital Media and HCI Research Center, Hangzhou Normal University, Hangzhou 310012, China;
Survey On Parallel Collision Detection Algorithms, Fuchang Liu, Shuangjian Wang, Zhigeng Pan, Jinrong Wang
Journal of System Simulation
Abstract: The demand for real-time collision detection is increasing in different applications. Exploiting the parallel computing capability of multi-core CPUs and GPUs to accelerate the speed of collision detection algorithms has attracted abroad attention. This paper reviews the development history of collision detection algorithms and classified the existing algorithms from multiple perspectives. Moreover, we analyze the strengths and weaknesses of more than ten representative parallel collision detection algorithms based on multi-core CPUs and GPUs from the aspects of the scalability, memory consumption and workload balancing. Finally, the problem of present parallel collision detection research and potential direction of following research …
Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data,
2020
1. Advanced Computing and System Laboratory, Zhejiang University, Hangzhou, 310027, China;;
Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data, Wanxian Guan, Wanpeng Li, Ge Lin, Huagen Wan
Journal of System Simulation
Abstract: In recent years, urban mobile augmented reality has important application prospects. However, with the large-scale scenes in the cities, how to collect and reasonably manage and organize as well as efficiently use the big data sets has become an important issue for the performance of mobile augmented reality. To solve this problem, this paper proposed an urban mobile augmented reality method based on the free organization of multi-modal data, with the application scenario of urban streetscape enhancement. The proposed method takes the multi-modal data as the centric context and aims at how to acquire and process raw data effectively, …
Denoising Algorithm Based On Neighborhood Expansion Clustering,
2020
School of Information, Yunnan Normal University, Kunming 650500, China;
Denoising Algorithm Based On Neighborhood Expansion Clustering, Xinggang Li, Yaping Zhang, Yuwei Yang
Journal of System Simulation
Abstract: Aimed at the three dimensional point clouds model with outliers and noises which is reconstructed based on 2D images, a new denoising algorithm based on neighborhood expansion clustering is proposed. The search for other neighboring points of each data point is conducted by using the Euclidean distance between data points and the transitive property of the neighborhood location relation. All points are processed for cluster partition, which detects and filters the outliers in the point clouds model. The concept of neighborhood expansion clustering and the fast search algorithm based on dynamic grids division are discussed. It solves the …
Surface Reconstruction Of Point Cloud Based On Geometric Structure,
2020
China Simulation Federation
Surface Reconstruction Of Point Cloud Based On Geometric Structure, Zhenfa Yang, Wan Gang, Xuefeng Cao, Li Feng, Lixiang Xie
Journal of System Simulation
Abstract: To solve the problems that the existing noise in dense point cloud generated from sequential images dense matching affects the accuracy, and geometric structure such as flat exists in urban scenes, a surface reconstruction method of dense point cloud based on geometric structure is proposed in this paper. RANSAC algorithm is applied to extract planar structure. The original points were structured into planar points, crease points of two planes intersecting, corner points of three or more planes intersecting and clutter points. Then the structured point cloud is divided into tetrahedron by 3D Delaunay, improving the penalty term …
Pcnl: A Visual Analysis Method For Comparing Homogeneous Hierarchical Data,
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;
Pcnl: A Visual Analysis Method For Comparing Homogeneous Hierarchical Data, Dong Yu, Chen Yi, Yuehong Sun
Journal of System Simulation
Abstract: According to the requirements of comparing homogeneous hierarchical data in different fields, a visual analysis method called PCNL is presented in this paper. Homogeneous information is extracted from the multiple levels of the heterogeneous hierarchical data set, and isomorphic node-link trees are constructed. Parallel coordinates are combined with node-link trees, which displays attribute values of leaf nodes in multiple isomorphic trees. Interactive techniques are introduced to help users to compare and analyze multiple attributes of each leaf node in multiplehomogeneous hierarchical structures. Applying this method to compare multi-national MRL data in food safety field can help users to …
Role And Background Effects Enhancement In Holographic Projection,
2020
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;
Role And Background Effects Enhancement In Holographic Projection, Desheng Lü, Zhiye Lin, Kong Lu
Journal of System Simulation
Abstract: Although holographic projection technology combined with three-dimensional animation can be seen on many shows nowadays, the poor ability to identity the black color and the high requirement for camera's placement, which lead to the lack of content and high complexity, have become main restrictions for the development of holographic animation. An algorithm is proposed to replace or adjust the lightness of black color in holographic animation to improve the projection. The linkage of camera in four directions is studied to facilitate the acquisition of holographic projection images, which enhances the holographic animation effect. Finally, a real projection platform …
Coveragedetecting Algorithm Based On Sub-Pixel Geometricprimitives,
2020
1. School of Computer Science and Technology, Changchun University of Science and Technology, Changchun130022, China;;2. National Local combined Engineering Research Center of Special Film Technology and Equipment, Changchun130000, China;
Coveragedetecting Algorithm Based On Sub-Pixel Geometricprimitives, Li Hua, Huamin Yang, Han Cheng, Jianping Zhao
Journal of System Simulation
Abstract: A hard shadow anti-aliasing rendering algorithm with sub-pixel accuracywas proposed. The method focused on addressing aliasing artifacts of the shadow map due to the sample density mismatching between light space and camera space. The method extracted geometric primitives from the scene's front view from a light source and storedscene visible triangles with fixed-size and local approximation using conservative rasterization; An algorithm was proposed to detect the covered plurality primitives in one texel based on the texel's vertices, and reconstruct testing depth of shadow ray precisely. The experiment results showed that covered primitives' detection algorithm was able toidentify …
Simulation On Switch Reluctance Motor Vibration Under Load Condition Based On Ansys,
2020
Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
Simulation On Switch Reluctance Motor Vibration Under Load Condition Based On Ansys, Luan Ru, Jinru Guo
Journal of System Simulation
Abstract: At present, the research on the vibration problem of switched reluctance motor is limited to the natural mode analysis under no-load condition. The coupling calculation of transient electromagnetic field and structure dynamic field in SRM is deduced. It is proved that the vibration results of SRM can be obtained under the load. An improved simulation method is proposed to improve the data link of Workbench ANSYS, and to realize the direct coupling of the whole data link between the transient electromagnetic field and the transient structural dynamic field. The simulation method is described in detail for a specific SRM …
3d Simultaneous Localization And Mapping Based On Rgb-D Images,
2020
1. School of Information Engineering, Nanchang University, Nanchang 330031, China;;
3d Simultaneous Localization And Mapping Based On Rgb-D Images, Lingyan Hu, Cao Lu, Pengwen Xiong, Xin Yong, Zekun Xie
Journal of System Simulation
Abstract: To reduce the accumulated pose error of robots during the three-dimensional simultaneous localization and mapping, a global optimization method is proposed to improve the positioning accuracy and the quality of the map. This method, which is based on the visual odometry of the frame and frame registration model, adds the pose-constraints by closed-loop detection based on image matching. Local loop is combined with random loop to improve the optimization efficiency. The general graph optimization algorithm is used to globally optimize the robot poses. A key-frame selection strategy is also proposed to decrease the consumption of the …
Flight Support Service Time Estimation Of Hub Airport,
2020
1. R&D Base of Special Ground Equipment, CAUC, Tianjin 300300, China;;2. College of Electronic Information and Automation, CAUC, Tianjin 300300, China;
Flight Support Service Time Estimation Of Hub Airport, Zhiwei Xing, Yunxiao Tang
Journal of System Simulation
Abstract: For the convenience of airport to publish the accurate information about flight status to passengers in time, estimating the service time of airport flight support is needed. Because the flight support service is a mixed procedure of job shop and fixed site, and has characteristics of time window constrains and resource demand difference, a model of flight support service procedure based on vehicle routing problem with time windows (VRPTW) was built. For the strong NP nature of vehicle routing problems, a two phase hybrid heuristic algorithm based on greedy algorithm and tabu search was proposed. It was applied to …
Fault Diagnosis Method Of Pmsm Based On Adaptive Dynamic Cat Swarm Optimization Of Svm,
2020
Engineering Research Center of Internet of Things Technology Applications Ministry of Education, Wuxi 214122, China;
Fault Diagnosis Method Of Pmsm Based On Adaptive Dynamic Cat Swarm Optimization Of Svm, Wang Yan, Wang Xin, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: In order to solve the problems of common inter-turn short circuit faults of permanent magnet synchronous motor (PMSM), a corresponding motor fault model based on the existing basis of PMSM is established. The eigenvector is extracted by energy spectrum analysis. The penalty factor and RBF-kernel parameter of SVM are optimized by adaptive dynamic cat swarm optimization (ADACSO) algorithm. The optimized SVM is adopted to motor fault diagnosis. The eigenvector obtained by energy spectrum analysis is taken as sample data to conduct simulation experiment. The experiment results indicate that, compared with other optimization algorithms, using ADACSO to optimize …
Design And Implementation Of Online Interactive Educational Game Based On Somatosensory,
2020
1. Digital Media and HCI Research Center, Hangzhou Normal University, Hangzhou 310012;;
Design And Implementation Of Online Interactive Educational Game Based On Somatosensory, Ban Rui, Dandan Ding, Mingmin Zhang, Huaqing Shen
Journal of System Simulation
Abstract: The somatic game has been widely used in the educational field because of the advantages of excellent experience, multi sense and student-centered. But now, the commonly used somatic game equipment is based on PC, such as Kinect, which does not support browsing on web and requires long period development, failing to meet the teaching demands. This leads to the slow and imbalanced developments of somatic-based education game. To solve those problems, this paper puts forward a solution, which combines Websocket communication mechanism and Kinect recognition mode. In order to promote the integration of education and games, this paper further …
