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Theoretical Model And Validation Of Delivery Time Of Ltp In Deep Space Communication, Wang Yang, Yang Hong, Xiaoguang Chen, Ding Kai 2020 Institute of Manned Space System Engineering, China Academy of Space Technology, Beijing 100094, China;

Theoretical Model And Validation Of Delivery Time Of Ltp In Deep Space Communication, Wang Yang, Yang Hong, Xiaoguang Chen, Ding Kai

Journal of System Simulation

Abstract: An accurate theoretical model of LTP in deep space communication was established, taking into account the characteristics of extremely long propagation delay, intermittent connectivity, asymmetric data rates and high error rates. Compared with the theoretical model built before, the model paid more attention to the different impacts of losses of different types of LTP data segments, multiple-session transmission characteristic of LTP, and calculated the expected value of transmission rounds. The performance of theoretical model with different channel BERs and file sizes was simulated and analyzed by MATLAB. A DTN testbed was built and the actual file transfer experiments …


Uav-Mimo Channel Characteristic Analysis Based On Gbsbcs Model, Xijun Gao, Zili Chen, Yongjiang Hu, Zidong Zhou 2020 Department of UAV Engineering, Ordnance Engineering College, Shijiazhuang 050003, China;

Uav-Mimo Channel Characteristic Analysis Based On Gbsbcs Model, Xijun Gao, Zili Chen, Yongjiang Hu, Zidong Zhou

Journal of System Simulation

Abstract: The simple form of UAV space-time-frequency channel correlation function was presented based on the three-dimensional geometrically based single bounce concentric elliptic ring scattering (GBSBCER) channel model of Multi-Input Multi-Output(MIMO)for Unmanned Aerial Vehicle (UAV). The analytic formula of UAV-MIMO normalized correlation matrix was deduced. The effect of antennas structures, flight distance and scatters distributing on the characteristic parameters such as the condition number of UAV-MIMO channel matrix and the channel capacity were analyzed by this formula. The simulation results show that, the performance of UAV-MIMO communication can be improved by reasonably arranging the antennas, adjusting the flight parameters, which …


Real-Time Simulation Of Realistic Melting In Fluid-Solid Interaction, Xuqiang Shao, Song Yu 2020 School of Control and Computer Engineering, North China Electric Power University, Baoding 071003, China;

Real-Time Simulation Of Realistic Melting In Fluid-Solid Interaction, Xuqiang Shao, Song Yu

Journal of System Simulation

Abstract: In order to realize real-time simulation of realistic melting in fluid-solid coupling, a particle-based GPU parallel simulation method was proposed. This method employed an implicit heat diffusion model which took the heat conduction properties of materials to update the temperatures of each particle. Based on the lattice shape matching method, a stable topology change method was proposed to simulate the conversion of solid particles to the fluid particles. In order to improve the time performance of each time step, a parallel simulation method entirely implemented on GPU was put forward, and an iterative filling algorithm was designed to dynamically …


Skeleton Extraction From Three-Dimensional Maize Based On Kinect, Zhili Fang, Weiliang Wen, Xinyu Guo, Jianwei Wu 2020 1. Beijing Research Center for Information Technology in Agriculture/ Beijing Key Lab of Digital Plant/ National Engineering Research Center for Information Technology in Agriculture/ Key Laboratory of Agri-information Ministry of Agriculture, P R China/ Beijing Agriculture Internet of Things Engineering Technology Research Center, Beijing 100097, China; ;2. Shanghai Ocean University Information College,Shanghai 201306, China; ;

Skeleton Extraction From Three-Dimensional Maize Based On Kinect, Zhili Fang, Weiliang Wen, Xinyu Guo, Jianwei Wu

Journal of System Simulation

Abstract: Aiming at acquiring three-dimensional skeleton of maize plant efficiently, an automatic three-dimensional maize plant skeleton extraction method based on Kinect data was proposed. Kinect data was transformed into point cloud data. Backgroundpoint cloud was deleted by threshold segmentation and the point cloud was stratified according to the height of the 3D model. Each layer was clustered by two circle iteration and the center points of each cluster could be obtained. The set of center points could be considered as the skeleton points of maize. The quadratic B-spline interpolation curve was used to obtain relatively accurate and smooth linear …


Research Of Modeling Of Spatial Information Support Sos Based On Complex Network Theory, Qingjun Zhang, Mingzhi Zhang, Qingjuan Zhang, Wu Xi 2020 1. Department of Information Operation & Command Training, National Defense University, Beijing 100091, China;;

Research Of Modeling Of Spatial Information Support Sos Based On Complex Network Theory, Qingjun Zhang, Mingzhi Zhang, Qingjuan Zhang, Wu Xi

Journal of System Simulation

Abstract: Spatial information support system as the main body of space operations, in the future network of joint operations, plays a central role. Based on the characteristics of spatial information support system, a modeling method combining multi-agent, multi-resolution and complex network was proposed, and the spatial information support system model framework was constructed. Multi-agent model, multi - resolution model and complex network model were established, and the connectivity rate in the complex network model was simulated and analyzed, so as to lay the foundation for further research on the modeling of spatial information support system.


Vulcanization Shop Scheduling Based On Distribution Estimation Algorithm, Shougang Zhang, Longcheng Wu, Wang Yan, Zhicheng Ji 2020 Engineering Research Center of IoT Technology Applications Ministry of Education, Jiangnan University, Wuxi 214122, China;

Vulcanization Shop Scheduling Based On Distribution Estimation Algorithm, Shougang Zhang, Longcheng Wu, Wang Yan, Zhicheng Ji

Journal of System Simulation

Abstract: Due to the characteristics of long time-consuming, energy consumption and high concentration in rubber tire vulcanization process, which is the tire production process bottlenecks process, a discrete distribution estimation algorithm (EDA) was proposed to solve the problem of vulcanization shop scheduling optimization with minimum maximum completion time as the optimization target. The algorithm was tested by different examples, and it was compared with the genetic algorithm and the harmony search algorithm. The experimental results show that the EDA algorithm is superior to the genetic algorithm and the harmony search algorithm in the quality of the solution and convergence speed, …


Off-Line Calibration Of Dynamic Traffic Assignment System Based On Flowsim, Yuhan Jia, Jianping Wu, Xu Ming, Mingyu Liu, He Lei 2020 1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;;2. Investment Banking Department, Profitability Units,Head Office of Industrial and Commercial Bank of China, Beijing 100140, China;;

Off-Line Calibration Of Dynamic Traffic Assignment System Based On Flowsim, Yuhan Jia, Jianping Wu, Xu Ming, Mingyu Liu, He Lei

Journal of System Simulation

Abstract: Advanced dynamic traffic assignment (DTA) system can be utilized to mitigate traffic congestion. Therefore, the calibration of DTA parameters is becoming increasingly significant in traffic research area. Based on extended Kalman Filter (EKF) and unscented Kalman Filter (UKF) algorithms, a case study for the off-line calibration of DTA was proposed using the microscopic traffic simulation system of FlowSIM. Experiments with a synthetic network validate the effectiveness of the two solutions, and the UKF shows better accuracy than the EKF algorithm. Furthermore, the performance of FlowSIM is promising to conduct the calibration of traffic system in future …


Agent Modeling Of Web Users Orientating Simulation Of Internet Public Opinion, Chuan Ai, Bin Chen, Liu Liang, Xiaogang Qiu 2020 National University of Defense Technology, Changsha 410073, China;

Agent Modeling Of Web Users Orientating Simulation Of Internet Public Opinion, Chuan Ai, Bin Chen, Liu Liang, Xiaogang Qiu

Journal of System Simulation

Abstract: People are individuals with independent behavior in society, and have important influence on the occurrence and development of public opinion emergencies. At the same time, the group composed of individuals is the disaster-bearing body of public opinion events. Therefore, the use of simulation modeling means to explore the occurrence and development of public opinion Mechanism, for the public opinion emergency response measures to provide decision support, the individual behavior of the modeling simulation is particularly important. Based on the analysis of the psychological behavior process of individual information processing, a complete mechanism model was put forward which could reflect …


Visual Simulation Of Eroded Rill Evolution Process On Graphics Processing Unit, Mansheng Long 2020 1. School of Electronics and Information Engineering, Jinggangshan University, Ji'an 343009, China; ;2. Key Laboratory of Watershed Ecology and Geographical Environment Monitoring, NASG, Ji'an 343009, China;

Visual Simulation Of Eroded Rill Evolution Process On Graphics Processing Unit, Mansheng Long

Journal of System Simulation

Abstract: A slope erosion model based on CA (Cellular Automata) and a corresponding simulation algorithm based on GPU (Graphics Processing Unit) were proposed to visualize rapidly the dynamic process of water erosion and microrelief development on hillslope under rainfall events. The model is composed of processes such as rainfall, infiltration, runoff, erosion, deposition, and sediment transport. At each time step, water and sediment were exchanged among adjacent cells observing sediment mass conservation law and flow continuity equation. All cells update their runoff and sediment simultaneously complying with the above simple rules so as to realize the evolution of hillslope microrelief. …


Research Of The Construction Of Gis-T Traffic Simulation Road Network, Huang Min, Zhongming Niu, Xiaolan Zhang, Jiajie Pan, Xueqiang Zhang 2020 1. Guangdong Provincial Key Laboratory of Intelligent Transportation System, Guangzhou, 510006, China; ;2. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China; ;

Research Of The Construction Of Gis-T Traffic Simulation Road Network, Huang Min, Zhongming Niu, Xiaolan Zhang, Jiajie Pan, Xueqiang Zhang

Journal of System Simulation

Abstract: In order to provide road network data for traffic simulation platform on the base of GIS-T, a GIS-T road network data model was created. The model put the emphasis on the description of traffic rules and road markings. On the basis of data model, a quantified cut method for linear referencing was proposed and the method was adopted to create road network element, such as lane boundary and road surface. Furthermore, the carriageway was regarded as the unit to keep the shape of road segment, and flow of building a road network was put forward. An intersection …


Study On Motion Cueing Algorithm Of High-Fidelity Based On Fuzzy Logic, Wang Hui, Daoyang Zhu, Ping Fan 2020 1. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China; ;

Study On Motion Cueing Algorithm Of High-Fidelity Based On Fuzzy Logic, Wang Hui, Daoyang Zhu, Ping Fan

Journal of System Simulation

Abstract: Because classical washout algorithm exists false cues and phase retardation, these problems cause the lack of motion proprioceptive fidelity in flight simulators. By combining human vestibular perception system and the theory of fuzzy logic control to regulate the feedback of its sensory error, the translational acceleration channel, the Tilt coordination channel and the angular velocity channel of classical wash out algorithm were compensated, respectively. Simulation and modeling was carried out by fuzzy logic washout algorithm, and simulation verification was conducted on a set of flight data within fuzzy logic washout algorithm. The simulation results show that the theory of …


Research On City Agglomeration Compound Traffic Reliability, Chengbing Li, Yucheng Hao, Wenying Wang 2020 School of Transportation, Inner Mongolia University, Hohhot 010070, China;

Research On City Agglomeration Compound Traffic Reliability, Chengbing Li, Yucheng Hao, Wenying Wang

Journal of System Simulation

Abstract: To improve the city agglomeration traffic network's ability to fight a sudden disasters, empirical research was made on city agglomeration traffic network reliability from a new view. The weighted traffic network model of the single transportation mode in urban agglomeration was built so that city agglomeration compound traffic network was formed by the superposition. The change of the traffic network reliability was quantified from relative size maximum connectivity graph, local efficiency rate, global efficiency rate. The nodes and edges of weighted road traffic network and compound traffic network face random attack and deliberate attack were simulated, analyzing …


Magnetic Levitation System Simulating And Its Chaos Research, Jiang Dong, Deshan Kong, Xukun Liu, Jiaxiang Yang, Deyu Wang 2020 College of Electrical & Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China;

Magnetic Levitation System Simulating And Its Chaos Research, Jiang Dong, Deshan Kong, Xukun Liu, Jiaxiang Yang, Deyu Wang

Journal of System Simulation

Abstract: The physical model, mathematical model and simulation model of the magnetic levitation system were set up. The function among magnetic force, electromagnet current and distance was deduced after the measuring. The dynamic equation of magnetic levitation ball was derived. The simulation model of the magnetic levitation ball system was set up. The simulation experiments for no vibration and external vibration and chaos state of the system were conducted. The phase trajectories of stable, quasi-periodic and chaotic states were researched. The waveforms of no vibration and external vibration and chaos state were measured. The tests show that the measured waveforms …


Research And Simulation On Control Algorithm For Multi-Objective Optimization Of Urban Rail Train, Jianjun Meng, Minggao Pei, Wu Fu, Tengzhou Wei, Hao Shuai 2020 1. School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; ;2. Mechatronics T & R Institute, Lanzhou Jiaotong University, Lanzhou 730070, China; ;3. Engineering Technology Center for Informatization of Logistics & Transport Equipment, Lanzhou 730070, China;

Research And Simulation On Control Algorithm For Multi-Objective Optimization Of Urban Rail Train, Jianjun Meng, Minggao Pei, Wu Fu, Tengzhou Wei, Hao Shuai

Journal of System Simulation

Abstract: According to the characteristics of urban rail train running multiple objective, the multi-objective operation model for urban rail train was established with the energy consumption, punctuality, accurate parking and comfort level as the optimization indexes. Genetic algorithms was used to optimize running multi-objective model of urban rail train, and according to train traction calculation and computer simulation, the train running target curve was obtained. The fuzzy control and PID control algorithm were applied to urban rail train system to establish adaptive fuzzy PID controller and PID control in order to track the target curve. Simulation results show that adaptive …


Soc-Based Bi-Directional Active Equalization Control For Lithium-Ion Power Battery, Shaojian Song, Zhihao Wang, Xiaofeng Lin 2020 School of Electrical Engineering, Guangxi University, Nanning 530004, China;

Soc-Based Bi-Directional Active Equalization Control For Lithium-Ion Power Battery, Shaojian Song, Zhihao Wang, Xiaofeng Lin

Journal of System Simulation

Abstract: The inconsistency of cell in the electric vehicles' lithium-ion power battery pack leads to decrease the battery pack's capacity and lifetime, and even seriously affect the electric vehicles' performance. An active equalization system was designed based on the bi-directional Buck-Boost topology. A novel active equalization control strategy was proposed to balance the lithium-ion battery pack in the process of charging and static state, which extreme learning machine (ELM) was used to predict the state of charge(SOC), and SOC was employed as the main balance criterion. The simulation results show that the proposed bi-directional active equalization method can realize the …


Optimal Configuration Method Of Block Spare Parts For K/N Systems Considering Cannibalization, Yongpan Wang, Chunhe Chang, Jiangping Yang 2020 1. Unit 93502 of PLA, Hohhot 010051, China; ;2. Air Force Early Warning Academy, Wuhan 430019, China;

Optimal Configuration Method Of Block Spare Parts For K/N Systems Considering Cannibalization, Yongpan Wang, Chunhe Chang, Jiangping Yang

Journal of System Simulation

Abstract: Aiming at the configuration problem of block spare parts in k/N systems, an optimal configuration method of block spare parts considering cannibalization and on-condition maintenance was proposed. A spare parts fill rate model for k/N systems was established on the basis of two parameters named cannibalization rate and SRU replacement rate, and the constraint conditions of both the parameters were given respectively. An optimal configuration model was built, which chose the minimum spare costs as the object and the spare fill rate as the subject, and a model solution algorithm based on the margin analysis theory was given. …


Radar Emitter Signal Identification Based On Slide+Svm, Yingkun Huang, Weidong Jin 2020 College of Electrical Engineering Southwest Jiaotong University, Chengdu 610031, China;

Radar Emitter Signal Identification Based On Slide+Svm, Yingkun Huang, Weidong Jin

Journal of System Simulation

Abstract: For the deficiency of traditional techniques of emitter signal feature extraction which heavily rely on experience, a model of radar emitting signal identification based on feature self-learning was proposed. This model consists of following 2 parts. Firstly, transform radar signal into frequency domain, then reduce signal dimension by using improved Piecewise Aggregate Approximation (PAA) method. Secondly, create the model of multi-layer Liner Denoiser (LIDE) to feature learning by using unsupervised training method. The validity of model was verified by simulating 5 different kinds of emitting signal with the outcome that excellent identification accuracy could be achieved at …


Work Mode Identification Of Phased Array Radar With Denoising Auto-Encoder, Haodong Liu, Weidong Jin, Chunli Chen, Cai Jian 2020 School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China;

Work Mode Identification Of Phased Array Radar With Denoising Auto-Encoder, Haodong Liu, Weidong Jin, Chunli Chen, Cai Jian

Journal of System Simulation

Abstract: A new method to recognize phased array radar in different work modes was proposed based on multi-level modeling combined with Marginalized Stacked Denoising Auto-encoder. In order to analyze the change law of pulses intercepted by surveillance radar, multi-level modeling was proposed to model the pulses at pulse level, pulse group level and work mode level. Marginalized stacked denoising auto-encoder was trained to extract amplitude characteristics at the work mode level. SVM (Support Vector Machine) was added to the top of deep network to realize work mode identification of phased array radar. Qualitative experiments show that the new method is …


Novel Automatic Pavement Crack Detection Algorithm, Shangbing Gao, Xie Zheng, Zhigeng Pan, Fangzhe Qin, Li Rui 2020 1. College of Computer and Software Engineering, Huaiyin Institute of Technology, Huaian 223001, China;;

Novel Automatic Pavement Crack Detection Algorithm, Shangbing Gao, Xie Zheng, Zhigeng Pan, Fangzhe Qin, Li Rui

Journal of System Simulation

Abstract: The complexity of noises covers a wide area of actual road images which causes that it is difficult to detect cracks. An automatic pavement crack detection algorithm was proposed in view of the characteristics of crack image in pavement disease. Gray-scale correction and filtering was used to preprocess the crack image. The maximum interclass variance method and Canny operator were used to detect the edge of the disease image, and then the localization and accurate segmentation algorithm was proposed for the crack image based on the maximum connectivity of the crack in the fracture image. The convolution neural network …


Novel Hierarchical Level Of Detail Combinatorial Optimization Method For Large-Scale 3d Scene, Che Li, Fengju Kang, Xueli Hou 2020 1. Marine College, Northwestern Polytechnical University, Xi'an 710072, China;;2. National Key Laboratory of Underwater Information Process and Control, Xi′an 710072, China;;

Novel Hierarchical Level Of Detail Combinatorial Optimization Method For Large-Scale 3d Scene, Che Li, Fengju Kang, Xueli Hou

Journal of System Simulation

Abstract: The traditional design process of large-scale 3D scene is cumbersome and lengthy and fail to provide ideal scene rendering effect. Aiming at this problem, a feedback mechanism based combinatorial optimization of level of detail (LOD) model for large-scale 3D scene was proposed. Through analyzing the influence of observation distance, moving speed and other factors on visual perception, the mathematical model of visual sensitivity was established. By the frame rate and visualization effect feedback, invoking the model level selection criterion to adjust the model's LOD level, and eventually an optimal scene model combination solution could be obtained. Experimental results demonstrate …


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