Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking,
2020
College of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China;
Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking, Fangzhou Zhang, Ruixue Sun, Wenjing Zhang, Li Long, Li Qiang
Journal of System Simulation
Abstract: Well control training was explained mainly by teacher in recent years. Virtual simulation made it difficult for students to understand the actual operation. Application of drilling well control simulation training system solved effectively the problem of the scene seldom repetition and high cost of well control training. For the simulation of the process of ram blowout preventer shut-in locking in the well controlled physical simulation training system, the stepping motor driver and the stepping motor were installed in ram blowout preventer, and locking operation of the lock device was realized by using speed and torque of the stepping motor …
Direct Torque Control For Brushless Dc Motor With Optimal Voltage Space Vector,
2020
School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
Direct Torque Control For Brushless Dc Motor With Optimal Voltage Space Vector, Xianzhong Jian, Shuangjie Qian
Journal of System Simulation
Abstract: The current freewheeling phenomenon and its causation of torque ripple were analysed. With the relationship between rotor and coil position, the traditional selection rules of voltage space vector were modified. To effectively control the freewheeling current, two different voltage space vector under the three-phase conduction model was proposed, making current keep close to the ideal curve and inhibit torque ripple. For speed adjustment, the Pang-Pang control was carried out after flow stage. The simulation model was carried out under the Simulink environment. The simulation results show that the proposed voltage space vector can effectively adjust the freewheeling …
Risk Simulation Analysis Of Runway Incursions Based On Multi Agents,
2020
1. Air Traffic Management Research Base , Civil Aviation University of China, Tianjin 300300, China; ;
Risk Simulation Analysis Of Runway Incursions Based On Multi Agents, Baojun Huang, Xiaodan Fang, Jiening Wang
Journal of System Simulation
Abstract: Nowadays, runway incursions are important problems affecting flight safety in airport surface operation. According to this problem, a new method was proposed for the risk analysis of runway incursion by using multi agent modeling theory, which established a risk analysis agent model of runway incursion. Pointing at typical scenarios for runway incursion incidents, LEADSTO (Language and Environment for Analysis of Dynamics by SimulaTiOn) language was applied to realize the accident simulation by temporal logic. Simulation results show that specification for pilot or controller behavior and alertness can avoid accidents occurrence. The proposed method can simulate dynamic system, which has …
Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin,
2020
State Key Laboratory of Eco-Hydraulic Engineering in Shaanxi, Xi'an University of Technology, Xi'an 710048, China;
Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu
Journal of System Simulation
Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG k–ε turbulent model was used to close the two-phase flow time-averaged equations. The conditions properties of free hydraulic jumps on corrugated beds with a stilling basin under 9 kinds of conditions were studied by numerical simulation. Simulation research results show: There are vortexes generated by corrugated beds surfaces, rotating in the clockwise direction. The pressure distribution on corrugated beds in hydraulic jump region appears a wavy change, and the difference between the pressure values at adjacent crest and trough gradually decreases along …
Research And Simulation Of Satellite Channel Three-State Markov Model Under Fog-And-Haze Weather,
2020
1. College of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; ;2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing 210044, China;
Research And Simulation Of Satellite Channel Three-State Markov Model Under Fog-And-Haze Weather, Yecai Guo, Lijian Cai, Weijuan Zhao, Xiuzai Zhang
Journal of System Simulation
Abstract: To accurately reflect the influence on the statistical characteristics of satellite channel under the fog-and-haze weather, the fog-and-haze weather was divided into the fog state, mixed state, and haze state, respectively, and their statistical characteristics were described by Rice model, Corazza model, and Suzuki model. Based on analyzing the conversion relation between fog-and-haze weather states, the satellite channel three-state Markov model was proposed. The defined joint level pass rate, the average fading duration and its relative error were used as the performance index of the satellite channel model, and the simulation tests were carried out. The simulation results show …
Drawing Of Isocandela Diagram In Dynamic Detection Of Light Intensity Of Airport Flight Aid Light,
2020
1. College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China; ;2. Ground Support Equipments Research Base of Civil University of China, Tianjin 300300, China;
Drawing Of Isocandela Diagram In Dynamic Detection Of Light Intensity Of Airport Flight Aid Light, Lishan Jia, Liwen Wang
Journal of System Simulation
Abstract: To the drawing of isocandela diagram in dynamic detection of light intensity of airport flight aid light, the method of using Regular Rectangle Grid Algorithm was promoted. According to the theory of dynamic detection of light intensity of airport flight aid light, detection data was handled. The method combined virtual grid system with drawing area grid system. Changing trajectory of isocandela curves were searched in the virtual grid system. After searching, they were mapped onto the drawing area grid system and filled, and the isocandela diagram was generated eventually. Drawing program of isocandela diagram was written, simulation experiments were …
Precisely And Efficiently Vector Data Rendering Method In 3d Gis,
2020
Department of Computer Science and Information, Hefei University of Technology, Hefei 230009, China;
Precisely And Efficiently Vector Data Rendering Method In 3d Gis, Shanglin Li, Hu Xia, Xiaoping Liu
Journal of System Simulation
Abstract: In the geographic information system (GIS), vector data has many important applications in such aspects as orientation space location and spatial analysis. It is essential to make 2D vector data overlay mapping to the 3d terrain accurately and efficiently in 3D GIS. A method based on dynamic vector texture pyramid was proposed to render vector data. The real-time generated vector texture block corresponding with the level of the pyramid according to the current view position. Vector data texture block and terrain block are one-to-one correspondence, then they are unified rendering. Unconstrained anisotropic texture filtering methods was used to reduce …
Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times,
2020
Department of Computer and Information Science, Southwest University, Chongqing 400715, China;
Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times, Tao Li, Luo Liang, Zili Zhang, Lai Hong, Fuyuan Xiao
Journal of System Simulation
Abstract: In order to characterize the self-organized tempo-spatial patterns of wait times in a healthcare service system, a multi-agent cardiac surgery service model (MA-CSS model) was proposed based on the multi-agent modeling within the context of cardiac surgery services. This model pays a special attention to how patients' and hospitals' behaviors and interactions affect the dynamics and relevant patterns of wait times with respect to some key factors, such as geographic accessibility to services, hospital resourcefulness, and wait times. By experimenting with the MA-CSS model, it was observed that certain regularities in wait times emerged from the simulation, which were …
Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection,
2020
1. Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, School of Information Science and Technology, Xiamen University, Xiamen 361005, China; ;
Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection, Zhangting Zhong, Yuan Fei, Jiale Wang, En Cheng
Journal of System Simulation
Abstract: To find an efficient and convenient method to determine whether a dredging is illegal is a very meaningful research content. A method of detection of throwing sand behavior based on Chirp signal was studied and three implementation schemes (subsection FFT fast correlation), FRFT and DeChirp were designed. The feasibility of the three schemes was verified by Wu Yuan Bay experiment and the simulation results. Anti-multipath and anti-noise performance of FRFT transform is the best. The performance of dechirp is the worst. Through the analysis, it comes out the conclusion: when the multipath effect is serious, FRFT algorithm …
Improved Svdd For Speech Recognition And Simulation,
2020
1. College of Information Management, Shanxi University of Finance & Economics, Taiyuan 030006, China; ;
Improved Svdd For Speech Recognition And Simulation, Hao Rui, Xiaofeng Liu, Yanbo Niu, Xiu Lei
Journal of System Simulation
Abstract: Support vector data description (SVDD) defines multi-class data by their respective hyper-spheres. The computational complexity of the quadratic programming problem is reduced significantly and it is easier to solve multi-class classification problems. Thus, SVDD has attracted more and more attention in the field of speech recognition research. For the problems of the feature vectors of speech samples overlapping and updating, the conventional SVDD for multi-class classification was improved. On the one hand, the spatial position of the samples was fully used to construct the decision function in overlapping domain of hyper-spheres; On the other hand, based on class incremental …
Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity,
2020
College of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, China;
Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity, Wenwei Zhan, Jingke Xi, Zhixiao Wang
Journal of System Simulation
Abstract: Fast Unfolding is a hierarchical community detection algorithm based on modularity. It runs very fast, but the accuracy needs to be improved. Because the algorithm adopts traditional modularity to merger communities, it only considers node link information and ignores the neighbor nodes. Therefore, two nodes that have common neighbors and weak link information may not be merged, thus affecting the accuracy. In view of the shortcomings, a hierarchical agglomerative community detection algorithm based on similarity modularity was proposed through introducing optimized similarity to improve the modularity. It adopts NMI as the accuracy measurement. Experiments on the real network …
Simulation Research On The Multipath Effect Of Bds Geo/Igso Satellite Navigation Signals,
2020
1. The 54th Research Institute of CETC, Shijiazhuang 050081, China; ;2. State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China;
Simulation Research On The Multipath Effect Of Bds Geo/Igso Satellite Navigation Signals, Yachuan Bao, Baoguo Yu, Mingfeng Qin, Luo Yi
Journal of System Simulation
Abstract: Pseudo range measure error oscillation phenomenon was discovered in BDS GEO/IGSO satellites monitoring. Research on the phenomenon was made with multipath signal generation and multipath effect theory. The dynamic multipath effect of satellites including GEO, IGSO and MEO were simulated based on the construction of dynamic model of satellites and multipath mirror reflection model. Theory analysis and simulation were made on the pseudo range and carrier phase measure error caused by different dynamic multipath effect. The simulation result is similar with the measure result of practical observation, which gives a new reference for the final revelation of the reason …
Telemetry Parameters Simulation Of Spacecraft Based On Computation Tree,
2020
Beijing Aerospace Control Center, Beijing 100094, China;
Telemetry Parameters Simulation Of Spacecraft Based On Computation Tree, Ti Zhou, Miao Yi
Journal of System Simulation
Abstract: Simulation system of spacecrafts' Telemetry and Command (TT&C) needs to simulate lots of telemetry parameters in every missions, whose computing algorithms are different. In the past applications, these algorithms are fixed as codes in software programs, so it is very difficult to improve the maintainability and reuse of the simulation system. By studying the computing methods of telemetry parameters described in configuration files, a design scheme was given in which the algorithms of parameters were flexibly configured, and the principle of methods were described specially in computing parameters, software models, data structure and algorithms. In this framework, the algorithms …
Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network,
2020
1. Institute of Information, Hunan University of Humanities, Science and Technology, Loudi 417000, China; ;
Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang
Journal of System Simulation
Abstract: Because of the influence of node's own state and other factors, the node in mobile P2P network often shows the selfishness and resource preference, which greatly affects the resource search efficiency of the network system. Aiming at this problem, a novel resource search mechanism was proposed based cooperation degree of nodes in selfish mobile Peer-to-Peer network. In the search mechanism, through the comprehensive evaluation of the node's information forwarding rate, the overall similarity and the core degree, the node with the highest degree of cooperation was selected as the relay node for information forwarding. At the same time, through …
Lidar-Based Relative Position And Attitude Filtering For Unknown Targets,
2020
1. China Academy of Space Technology, Qian Xuesen Laboratory of Space Technology, Beijing 100091, China; ;
Lidar-Based Relative Position And Attitude Filtering For Unknown Targets, Song Liang, Li Zhi, Xingrui Ma
Journal of System Simulation
Abstract: A LIDAR-Based Extended Kalman Filter (EKF) for relative position and attitude estimation of unknowns target was proposed. The relative position and attitude between the target and a servicing spacecraft was solved by the Iterative Closet Point (ICP) using LIDAR point cloud data, which served as the EKF's measurement input. The system states of EKF include the relative attitude, angular velocity, inertia ratios, relative position, relative velocity, and the position/attitude of target measurement reference frame with respect to target principle frame. The proposed filter estimated the relative position and attitude as well as the unknown parameters of the target. …
Coverage Path Planning Algorithm Based On Centroidal Power Diagram,
2020
Schoolof Computer and Information, Hefei University of Technology, Hefei 230009, China;
Coverage Path Planning Algorithm Based On Centroidal Power Diagram, Liping Zheng, Yajun Cheng, Lu Chang, Ting Liao
Journal of System Simulation
Abstract: Coverage path-planning algorithm is widely used in mobile sensor networks, multi-robot system, and other fields. The coverage path planning algorithm based on CCCPD(Centroidal Capacity Constrained Power Diagram) was studied. The classical Lloyd based generating method for Centroidal Power Diagram was extended to PD-Lloyd algorithm, which could be used for path-planning. Two optimizing strategies were proposed to enhance the credibility of the PD-Lloyd algorithm by considering the physical moving characteristics of individuals in the real scene. Experiments prove that the proposed algorithm has advantages of well stability and inherent collision-free characteristic, and can generate more optimal motion path.
Real-Time Scheduling Algorithm Of Dynamic With Fault-Tolerant In Heterogeneous Distributed Systems,
2020
1. Dongguan Polytechnic, Dongguan 523808, China; ;
Real-Time Scheduling Algorithm Of Dynamic With Fault-Tolerant In Heterogeneous Distributed Systems, Chongjie Dong, Yuqiang Chen
Journal of System Simulation
Abstract: The traditional heterogeneous distributed real-time scheduling algorithm didn't give consideration to the dynamic behavior of tasks. An aperiodic non-preemptible and heterogeneous distributed dynamic fault-tolerant model and presenting two fault-tolerant scheduling algorithms was proposed based on this model: DRFSA algorithm and DSFSA algorithm. DRFSA(Dynamic and Reliability-driven of hybrid with Fault-tolerant Scheduling Algorithm)algorithm is to improve the system reliability as the scheduling objective through the reasonable scheduling. DSFSA (Dynamic and Schedulability-driven of hybrid with Fault-tolerant Scheduling Algorithm) algorithm is to improve schedulability as the scheduling objective and tries to enhance the schedulability through less task execution time. Both algorithms can dispatch …
Novel Method On Features Tracking For Multi-Image Matching,
2020
Information Engineering University, Zhengzhou 450000, China;
Novel Method On Features Tracking For Multi-Image Matching, Kaikai Jia, Zhenjie Zhang, Xiangyang Hao
Journal of System Simulation
Abstract: Considering the slow motion between adjacent frames in image sequence, optical flow can be applied on image matching. A novel method for multi-image matching based on features tracking was proposed. The algorithm tracked features between adjacent frames, combining with matching strategy and FB Error, to achieve fast and accurate matching. Multi-image matching was finished by tracking features between image sequence. The experimental results show that the novel algorithm improves the efficiency and ensure the accuracy.
Combination Model Of Network Security Situation Prediction Based On Cooperative Games,
2020
Department of Computer Engineering, Dongguan Polytechnic, Dongguan 523808, China;
Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang
Journal of System Simulation
Abstract: Influenced by a variety of complicated factors, the network security situation has many characteristics, such as highly nonlinear, time-varying, and mutant. It is difficult to predict accurately with a single prediction method. In response to this shortage, a new combined prediction model for network security situation was proposed based on cooperation policy theory. The network security situation was predicted respectively by using the Elman neural network model, GM(1,1)model, support vector machine (SVM) mode. The Shapley value method of cooperative games was applied to determine the weight of each single prediction model, and the prediction results were weighted calculated to …
Modeling Method Of Communication Networks Background Traffic For Counter-Command Simulation Training,
2020
Academy of National Defense Information, Wuhan 430010, China;
Modeling Method Of Communication Networks Background Traffic For Counter-Command Simulation Training, Yunjun Lu, Fuli Cai, Zhou Ming
Journal of System Simulation
Abstract: For the actual need of the communication networks modeling in combat command simulation, a modeling method of background traffic was proposed which was oriented towards counter-command simulation training under the guidance of basic idea of index modeling. The background traffic model was designed and the simulation verification was carried on. The results indicate that such method is able to generate background traffic rapidly and efficiently, meeting the requirement of simulation training.
