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Articles 271 - 300 of 323
Full-Text Articles in Systems Science
Evolutionary Simulation Of Online Public Opinion Based On The Bert-Lda Model Under Covid-19, Muni Zhuang, Li Yong, Tan Xu, Taitian Mao, Kaicheng Lan, Lining Xing
Evolutionary Simulation Of Online Public Opinion Based On The Bert-Lda Model Under Covid-19, Muni Zhuang, Li Yong, Tan Xu, Taitian Mao, Kaicheng Lan, Lining Xing
Journal of System Simulation
Abstract: The construction of a large-scale online public opinion evolution simulation model has guidance value for differentiated emergency management and public opinion guidance in the worst-hit areas in Wuhan and the other areas in China during the outbreak of the COVID-19. In order to realize the fine-grained simulation of the public sentiment evolution of the topic, the LDA topic model is deeply integrated with BERT word vector to optimize the topic vector and power the text topic clustering. At the same time, on the basis of improving BERT pre-training task, the deep pre-training task is superimposed to improve the accuracy …
Research On Particle Filter Algorithm Based On Improved Grey Wolf Algorithm, Weigang Li, Li Yang, Yuntao Zhao, Baokang Yan
Research On Particle Filter Algorithm Based On Improved Grey Wolf Algorithm, Weigang Li, Li Yang, Yuntao Zhao, Baokang Yan
Journal of System Simulation
Abstract: The traditional particle filter algorithm is prone to particle depletion and weight degradation, and a large number of particles are needed to make an accurate estimation of non-linear system. A novel particle filter algorithm based on grey wolf optimization algorithm is proposed. The particles are employed to characterize the individuals of grey wolf and simulate the process of wolf hunting, which makes the particles move to the high likelihood region of posterior probability and improve the rationality of the distribution of the particles. Levy flight strategy is introduced in grey wolf algorithm to improve the convergence speed. The adaptive …
A Quantization-Based Integration Method For Stiff Ordinary Differential Equations, Zhihua Li, Jiang De, Chenjia Wu, Zhihua Fan
A Quantization-Based Integration Method For Stiff Ordinary Differential Equations, Zhihua Li, Jiang De, Chenjia Wu, Zhihua Fan
Journal of System Simulation
Abstract: QSS(Quantized State System) has advantages over the traditional time-discrete integration methods in solving general ordinary differential equation (ODE) systems, but it is not suitable for solving the stiff ODE systems. To effectively solve the stiff ODE systems, a step-correction optimization algorithm based on QSS (SCOA based-on QSS) is proposed, which combines the ideas of the QSS method and the implicit trapezoidal integral method. The simulation results of three typical stiff ODE cases show that the SCOA based-on QSS algorithm has advantages over other algorithms, and the simulation accuracy can be significantly improved by appropriately reducing the quantum size.
Cold Load Prediction Model Based On Improved Pso-Bp Algorithm, Junqi Yu, Wenqiang Jing, Anjun Zhao, Yanhuan Ren, Zhou Meng, Xinle Huang, Yang Xue
Cold Load Prediction Model Based On Improved Pso-Bp Algorithm, Junqi Yu, Wenqiang Jing, Anjun Zhao, Yanhuan Ren, Zhou Meng, Xinle Huang, Yang Xue
Journal of System Simulation
Abstract: Aiming at the low correlation between input and output data and the error of prediction model in PSO-BP neural network prediction model, a combined prediction method based on JMP, PSO-BP neural network and Markov chain is proposed. The method first uses JMP data processing software to process the input data and eliminating the low coupling degree samples, then conducts PSO-BP neural network training to obtain the cold load prediction results, and finally uses markov chain to eliminate the random errors generated by the system to obtain the final prediction results. The results show that the combined prediction method has …
Research On Intelligent Design And Simulation Method Of Screw Machine Process, Guodong Sun, Qichang He
Research On Intelligent Design And Simulation Method Of Screw Machine Process, Guodong Sun, Qichang He
Journal of System Simulation
Abstract: Aiming at the difficulty during the process design of the automatic screw machines, such as low efficiency and poor quality, a screw machine process design and verification system is developed. Supported by image recognition technology, the system would automatically obtain the quantity and the locations of the screwing holes from the top view. An optimization model will be established to optimize the tightening sequence of the screw according to RSA (Radar Spiral Algorithm) and improved genetic algorithm. An integration is conducted into Tecnomatix to simulate those optimized sequence in case of collision. The results indicate that the …
Research On Double Input Motion Somatosensory Algorithm Based On Logic Control, Wang Hui, Yingtao Liu
Research On Double Input Motion Somatosensory Algorithm Based On Logic Control, Wang Hui, Yingtao Liu
Journal of System Simulation
Abstract: Aiming at the two-input classic washout algorithm in the flight simulator, there are problems such as loss of perceived angular velocity signal, phase error, and insufficient fidelity. A logic control washing-out algorithm is proposed. Based on the vestibular system theory, the classic washout algorithm is used to improve the high-pass angular velocity channel structure. A logic controller and an angular displacement continuous generator are designed to optimize the coupling angular velocity in the high-pass angular velocity channel and the tilt coordination channel and stabilize the jump change washout angular displacement, so the improved algorithm is more consistent with the …
Visualization Of Finite Element Analysis Deformation Results Based On Hololens, Jinli Xu, Zhou Zheng
Visualization Of Finite Element Analysis Deformation Results Based On Hololens, Jinli Xu, Zhou Zheng
Journal of System Simulation
Abstract: An UWP application of virtual review of the finite element analysis based on Microsoft HoloLens is developed by using Unity3D software. A set of programs are completed to realize three-dimensional solid static finite element analysis in Matlab. To realize the visualization of the deformation effect, the useful information of the finite element analysis result is extracted and exported to VTK file, then converted into DAE file. A vertex shader is written in Unity3D software to realize the color display and the visualization of deformation effect of one-sided model, and finally the UWP application is released to HoloLens. The test …
Safety Evaluation And Risk Level Prediction Of Driving Behavior Considering Multi-Factors Influence, An Yu, Pengpeng Jiao, Zixiu Bai
Safety Evaluation And Risk Level Prediction Of Driving Behavior Considering Multi-Factors Influence, An Yu, Pengpeng Jiao, Zixiu Bai
Journal of System Simulation
Abstract: In order to study the influence of multi-factors of human-vehicle-road on driving behavior and vehicle safety status in road traffic system, a simulated driving comparison test of six scenarios combined by multiple factors is designed. Driving simulator, physiography and eye tracker are used to collect 19 indicators related to driving behavior respectively. The differences of sample data are compared by variance analysis. The nonlinear SVM(support vector machine) is used to classify and predict the sample data. The driving behavior risk level prediction model is established, and the validity of the model is verified by the experimental data. The …
Collision Simulation Analysis Of Sam Movable Guardrail, Hongjun Cui, Sixue Li, Minqing Zhu, Li Xia
Collision Simulation Analysis Of Sam Movable Guardrail, Hongjun Cui, Sixue Li, Minqing Zhu, Li Xia
Journal of System Simulation
Abstract: Aiming at the problem of low anti-collision grade of the movable guardrail at the opening of the central divding belt of the expressway, a SAm-level concrete movable guardrail and a new connecting device are proposed. Based on the finite element method, the collision model between the vehicle and the guardrail is established, and the collision process is also calculated by LS-DYNA. According to the collision results of different vehicle types, the safety performance of the guardrail is evaluated in terms of cushioning, blocking and guiding performance. The OIV value is less than 12 m/s for small vehicles' collision with …
Real-Time Prediction Of Primary Flow By Mpc Method In Heating System, Zhongbo Li, Jia Meng, Kang Yan, Haihong Wang, Li Miao, Lü Qing, Jingjing Xie, Dajun Fang
Real-Time Prediction Of Primary Flow By Mpc Method In Heating System, Zhongbo Li, Jia Meng, Kang Yan, Haihong Wang, Li Miao, Lü Qing, Jingjing Xie, Dajun Fang
Journal of System Simulation
Abstract: Based on the model predictive control method, this paper uses the discrete controlled autoregressive model to establish the dynamic heat transfer delay model of the secondary network and the thermal station model. The polynomial fitting method of machine learning algorithm is applied to identify and calibrate the parameters of the secondary network model and the thermal station model. The primary flow rate of the heating station under future operating conditions is predicted based on the model results, which provides a basis for the quality-based regulation of heating system. The model is verified by measured data, and the actual …
Research On Sins/Gnss/Train-Speed Integrated Navigation Algorithm, Wang Ke, Ligang Liu, Bin Zhou, Zhiyong Bu
Research On Sins/Gnss/Train-Speed Integrated Navigation Algorithm, Wang Ke, Ligang Liu, Bin Zhou, Zhiyong Bu
Journal of System Simulation
Abstract: The precise train positioning under complicated railway environment has been a key technical challenge for train navigation currently. In the conventional solutions, in case of satellite signals being weak or indiscernible, the task of positioning has to be undertaken by SINS alone. This will cause some serious error-accumulation problems, especially when low-cost inertial devices are used. In order to solve this problem, we propose a novel integrated train navigation algorithm, which includes two working modes. The SINS/GNSS mode is designed for the situation that satellite signals are valid, whereas the SINS/wheel-speed mode is for the weak signal environments. Both …
Threat Assessment For The Defense Penetration Paths Of Air Strike Aircrafts Based On Radar Chart, Shengli Liu, Wang Gang
Threat Assessment For The Defense Penetration Paths Of Air Strike Aircrafts Based On Radar Chart, Shengli Liu, Wang Gang
Journal of System Simulation
Abstract: Threat assessment for the defense penetration paths of air strike aircrafts provides important evidence for evaluating and improving the deployment of air defense. Considering that traditional threat assessment methods are difficult to intuitively reflect the threat degree of each path and the value of each evaluation indicator, a novel method of threat assessment for defense penetration paths based on radar chart is proposed. The threat assessment indicator system for the defense penetration paths of air strike aircrafts is put forward. The weights of threat assessment indicators are calculated by the group decision analytic hierarchy process (AHP) and the method …
Cpm-Ga For Multi-Satellite And Multi-Task Simulation Scheduling, Liheng Mao, Deng Qing, Rouni Liu, Xianglong Kong
Cpm-Ga For Multi-Satellite And Multi-Task Simulation Scheduling, Liheng Mao, Deng Qing, Rouni Liu, Xianglong Kong
Journal of System Simulation
Abstract: With the increase of the number of satellites and targets, the space for solving satellite task planning increases rapidly. For large-scale multi-satellite and multi-task planning, a hierarchical optimization method, which consists of Critical Path Method (CPM) and Genetic Algorithm (GA) is proposed. The method decomposes the satellite task planning into two subproblems: task allocation and single-satellite task processing. Task allocation is realized by GA and a task allocation result corresponds to an individual of the population. The CPM is used in the single-satellite task processing to solve the fitness of each individual, which improves the optimization efficiency, ensures the …
Impact Analysis Of Gun-On Target Parameters On The Blunting Effect Of The Soft Protective Human Body, Sun Fei, Wenmin Yan, Junbin Zhang, Yongjuan Wang, Xu Cheng
Impact Analysis Of Gun-On Target Parameters On The Blunting Effect Of The Soft Protective Human Body, Sun Fei, Wenmin Yan, Junbin Zhang, Yongjuan Wang, Xu Cheng
Journal of System Simulation
Abstract: In order to research the blunt impact effect of target-entry parameters of pistol bullets, the finite element models of the soft upper body of the pistol blunt with a soft-protected human body are developed. By hitting the heart, lung, liver and stomach at three target-entry velocities, the impact response of pistol bullet impacting on human torso with soft armor is numerically calculated by finite element method. The simulation results quantitatively reveal the pressure transmission mechanism of the human body with blunt body armor at different target speeds and positions and the law of blunt impact response at different target …
Modeling And Simulation Of Physical Layer Security Strategy In Two-Way Cognitive Networks, Pan Lei, Li Zan, Zhili Zhang, Xiangyang Li
Modeling And Simulation Of Physical Layer Security Strategy In Two-Way Cognitive Networks, Pan Lei, Li Zan, Zhili Zhang, Xiangyang Li
Journal of System Simulation
Abstract: In order to improve the performance of the mobile communication system, the physical layer security transmission models of a two-way cognitive relay network with the primary network and eavesdropper are established, and a joint optimization strategy for relay selection and power allocation is proposed to protect the source-destination transmission against the eavesdropper. It can be seen from the simulation analysis that this non-convex optimization problem has many restrictions, and it is difficult to guarantee the feasibility of the initial solution generated randomly by the PSO algorithm, resulting in the difficulty of obtaining solution. Therefore, a hybrid optimization algorithm based …
Architecture Design Of An Emergency Command Simulation Exercise Platform Based On Tena, Peng Zhang, Qinfu Li
Architecture Design Of An Emergency Command Simulation Exercise Platform Based On Tena, Peng Zhang, Qinfu Li
Journal of System Simulation
Abstract: Based on the analysis of the current situation and development needs of the emergency command simulation exercise platform and the common characteristics of most emergency command case scenarios, an emergency command simulation exercise platform architecture based on TENA (Test and Training Enabling Architecture) is designed and put forward, which can expand various simulation models such as disaster accidents, disaster-bearing subjects, higher-lower linkage command organizations, rescue forces, natural environment, etc. in a multi-granularity and modular manner, and interface with various exercise support and analysis evaluation tools, as well as heterogeneous systems such as external three-dimensional simulation, virtual reality/augmented reality equipment …
Study On Validation Of Simulation Models Based On Weight Matrix Gray Relational Analysis, Xiaolei Ning, Yingxia Wu, Zhanqi Chen
Study On Validation Of Simulation Models Based On Weight Matrix Gray Relational Analysis, Xiaolei Ning, Yingxia Wu, Zhanqi Chen
Journal of System Simulation
Abstract: When used to validation of simulation models, ordinary gray relational analysis (GRA) usually stresses the similarity but ignores the nearness between the simulation test time series and flight test time series, while the nearness is part of model error. To reduce the risk in application of GRA to validation of simulation models, a new matrix gray relational analysis was proposed, which was in view of the similarity and the nearness between the simulation test time series and flight test time series, so it had a higher accuracy and reliability. The new model could solve the relational analysis problem with …
Research On Simplified Approach Of Multi-Physics Coupling Simulation, Xuegong Sun, Liu Jing
Research On Simplified Approach Of Multi-Physics Coupling Simulation, Xuegong Sun, Liu Jing
Journal of System Simulation
Abstract: Multi- physics coupling simulation of aircraft is a highly coupled and advanced nonlinear process. Traditionally, the data of professional model was collected through engineering algorithm, experience. The over- simplfied approach reduced the accuracy of the simulation result. Therefore, a simplified but effective approach according to the characteristics of each multi-physics coupling model needed to be found. Through multi- physics coupling simulation research which focused on the main contradictions and engineering requirements, ignores minor contradictions, depending on characteristics of the various couplings and application requirements, the simplified approach and conclusions were put forward and verified by examples.
Inventory M Lodels With Transshipment Collaboration Among Bases Supporting Different Geographical Regions, Jinhong Zhong, Cheng Hao, Zhou Yun
Inventory M Lodels With Transshipment Collaboration Among Bases Supporting Different Geographical Regions, Jinhong Zhong, Cheng Hao, Zhou Yun
Journal of System Simulation
Abstract: A multi location inventory system composed of a depot and several bases that covers diferent geographical regions was addressed, where there was bidirectional transshipment between the locations at the same region, and unidirectional transshipment between the locations at the different region. Each location in the system faced isolated Poisson distribution demand and adopted continuous review (S-1, S) policy. According to the M/G/S/S queue theory, birth and death process model and approximate calculation thought, the inventory models for the loss sales case and backorder case were established respectively. A discrete event simulation procedure for the inventory system was designed to …
Simulation Of Multiple Diffraction For Uwb Signals Under Nlos Environment, Han Tao, Jianxun Song, Hongcheng Wang
Simulation Of Multiple Diffraction For Uwb Signals Under Nlos Environment, Han Tao, Jianxun Song, Hongcheng Wang
Journal of System Simulation
Abstract: A time domain (TD) solution based on uniform theory of diffraction-physical optics (UTD-PO) was presented to analyze the multiple diffraction propagation characteristics of UWB signals under NLOS environment. The solution provided a simplified method, which utilized a recursion relation and did not need to incorporate the slope diffraction in the transition zone. The channel impulse response of the renowned Bertoni models was derived and the received signals could be predicted through a simple operation of convolution. The numerical results show that the proposed solution based on UTD-PO can find application in the analysis of multiple diffi-action and significantly reduces …
Method For Real-Time Controllable Step-Length Human Leg Continuous Walking Motion Generation, Shuxu Jing, Zhang Di, Tinglei Zhang, Shaoxin Yuan
Method For Real-Time Controllable Step-Length Human Leg Continuous Walking Motion Generation, Shuxu Jing, Zhang Di, Tinglei Zhang, Shaoxin Yuan
Journal of System Simulation
Abstract: Based on a free walking description model which is not capable of step length control, an iteration algorithm was proposed for solving the corresponding straight walking motion according to the given single step length which could be continuously adjusted. The problem of smooth transition between two consecutive walking steps was solved by pose-wise Bezier weighting, which kept the starting and ending poses of a walking step constant. Continuous straight leg walking motion with continuously varied step length could be generated real-timely. The proposed method provided a solution for real-time continuoxis leg walking motion generation with known step lengths in …
Behavioral Simulation Modeling Of Single Photon Avalanche Diode, Xu Yue, Xiaopeng Xie, Yue Heng
Behavioral Simulation Modeling Of Single Photon Avalanche Diode, Xu Yue, Xiaopeng Xie, Yue Heng
Journal of System Simulation
Abstract: An accurate behavioral simulation model for single photon avalanche photodiode (SPAD) was proposed. This presented model solved the convergence problem existed in SPAD avalanche current simulation, and achieved the basic static DC and dynamic AC behaviors modeling. The model functions were extended. Two important statistical effects of dark-counting and after-pulsing phenomena were included in this model according to their physical mechanisms. The model has been written in Verilog-A hardware description language, showing good characteristics of transplantation and universality. A good agreement with more than 90% accuracy is achieved between the model basic simulations and the experimental results, proving the …
Decoupling And Partial Iterative Calculation Method Of Flexibility Dynamics, Xianzhong Wang, Minlan Tang, Jinfang Dong
Decoupling And Partial Iterative Calculation Method Of Flexibility Dynamics, Xianzhong Wang, Minlan Tang, Jinfang Dong
Journal of System Simulation
Abstract: Some spacecrafts have large solar panels and a lot of propellant. These spacecrafts with flexible modes can reach hundreds of order. High-powered computers are needed for these spacecrafts,flexibility dynamics iterative operation within several milliseconds. The measures of decoupling flexibility vibration from body rotation and partial iterative calculation were applied to avoid no convergence of the flexibility dynamics iterative operation because of iterative computing error. The parameters of flexible dynamics model which were decoupled could be calculated off-line. The amount of calculation was decreased for the decoupled flexibility dynamics model as parameters could be computed before simulation. The method doesn't …
Construction Of Real-Time Simulation Model Of Fire Fighting Pump System Of Airport Fire Engine, Lishan Jia, Liwen Wang
Construction Of Real-Time Simulation Model Of Fire Fighting Pump System Of Airport Fire Engine, Lishan Jia, Liwen Wang
Journal of System Simulation
Abstract: To the simulation of fire fighting pump system of airport fire truck in driving training simulator of airport fire engine, the method of construction of simulation model of fire fighting system was promoted. Simulation model of centrifugal pump of airport fire truck was constructed, which was designed for simplification to satisfy the real-time performance of running of system. Considering fire fighting operation of fire truck, simulation model of operation of fire fighting pump system was constructed, which could not only simulate common fire fighting operation of fire truck, but also simulate running status of low pressure of fire fighting …
Modeling And Simulation Of Detection Probability For Whole Airspace Oriented Optical Target, Hongie Dang, Haozhang Yu, Luofeng Deng, Guanlei Jiang
Modeling And Simulation Of Detection Probability For Whole Airspace Oriented Optical Target, Hongie Dang, Haozhang Yu, Luofeng Deng, Guanlei Jiang
Journal of System Simulation
Abstract: To ensure the target within view field is the precondition of the tracking measuring equipment working normally, which is described by probability in engineering. A precise method of optical equipment detection probability was addressed aiming at the maneuverable targets, an exact description method of the whole airspace detection according to optical sensor was put forward, and a detection probability model for optical target was set up. A calculation method suited the model was confirmed,which was given by simulation analysis of the algorithm's calculation performance, the influence of model various parameters on algorithm was analyzed, and a comparison was given …
Research On Safety Protection Compositive Simulation Test Bed For Electric Secondary System, Zheniu Zhou, Angang Zheng, Heping Zou
Research On Safety Protection Compositive Simulation Test Bed For Electric Secondary System, Zheniu Zhou, Angang Zheng, Heping Zou
Journal of System Simulation
Abstract: Existing information and network security simulation methodologies of model construction were analyzed and compared with each other, and applicability and limitations of each of them were summarized. Then according to safety protection needs to electric secondary system, based on previous research results of security simulation aiming at individual and partial objects, a safety protection compositive simulation test bed was designed and implemented in which eight kinds of simulation technology and solutions were integrated. This test bed included four simulation layers and seventeen categories of simulation test, and achieved a large scale, distributed, linkage-type simulation for comprehensive information security. This …
Rendezvous And Docking Digital Simulation System Based On Matlab, An Hao, Zhenshen Qu, Changhong Wang
Rendezvous And Docking Digital Simulation System Based On Matlab, An Hao, Zhenshen Qu, Changhong Wang
Journal of System Simulation
Abstract: On the background of lunar orbit rendezvous and docking (RVD), a framework of the simulation system was designed. The dynamics, navigation and controller of the RVD system were built in detail, and a Simulink model of the lunar orbit RVD was established based on these results. A user interface and a 3D dynamic demonstration were designed to make the operation convenient and intuitive.The digital simulation system can be used to verify the lunar orbit RVD missions incipiently. Furthermore,a semi-physical RVD simulation was taken by using the modified model. The simulation results show the effectiveness of the inertia-visual integrated navigation …
Study On Key Nodes Analysis Method Of Space Information Network, Mingzhi Zhang, Luo Kai, Wu Xi
Study On Key Nodes Analysis Method Of Space Information Network, Mingzhi Zhang, Luo Kai, Wu Xi
Journal of System Simulation
Abstract: Because of the dynamic of the Space Information Network (SIN), the key nodes analysis should be considered in a time section. The method of the key nodes analysis of SIN was introduced based on time slice. On this basis, combining with the features of satellite, a new method of the key nodes analysis of SIN based on accumulation pattern was proposed. The new method used the weighted processing technology to the access time and the access number, and then transformed the SIN to a static weighted network. Through the simulation using STK and MATLAB, the results of experiments show …
Interference Alignment Based Throughput Optimization Model Of Multi-Hop Networks, Zui Xiong, Keren Wang, Jin Hu, Feng Hui
Interference Alignment Based Throughput Optimization Model Of Multi-Hop Networks, Zui Xiong, Keren Wang, Jin Hu, Feng Hui
Journal of System Simulation
Abstract: Due to its benefits of enbancing the spectrum utility in information theory, interference alignment (IA) is quickly adopted in multi-hop wireless networks. The constraints of "node activity in the existing throughput optimization model with IA are insufficient for converging to the optimal solution; the feasibility of IA is not involved. Thus, some measures were taken to compensate for the problems above.The longitudinal constraints of node activity were presented, and the feasibility condition of IA was discussed by the means of setting constraints on the data rates and the macimal number of interfering links at each node. The simulation results …
Co-Simulation Of Intelligent Lower Limb Assist Device Virtual Prototype, Zhenze Liu, Fengming Wang, Xuange Zhang, Cangqiong Yin
Co-Simulation Of Intelligent Lower Limb Assist Device Virtual Prototype, Zhenze Liu, Fengming Wang, Xuange Zhang, Cangqiong Yin
Journal of System Simulation
Abstract: A virtual prototype model of power assist device for lower extremity was established to improve the efficiency and reliability of the power assist device design. The mechanical model using software CATIA was introduced to ADAMS to establish the virtual model, so as to carry out the kinematics and dynamics simulations, and combined the previous model established by ADAMS with the control model established in MATLAB/Simulink to realize the co simulation of the system. According to the characteristics of human gait data, PID control algorithm was used to control lower limb power system. The simulation results demonstrate that the control …