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Articles 3721 - 3750 of 3973
Full-Text Articles in Systems Science
Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen
Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen
Journal of System Simulation
Abstract: Combined with the key link of the general cargo loading and unloading operations, the system simulation method is employed to analyze the production efficiency for the general cargo handling operation. The Plant Simulation software is used to design the main modules of the production process such as collection operation, vessel arrival, yard operation, horizontal transportation, ship-loading operation. The simulation model of general cargo handling operation is established based on the whole operation process. The simulation model is running based on the practical production data, and the efficiency of the crane, transitions time and the average storage period are analyzed. …
Gas-Liquid Flow Characteristics Study On The Amino Acid Fermentation Tank, Xiaodong Hu, Qinglei Liu, Fuyu Liu, Dexin Zhang
Gas-Liquid Flow Characteristics Study On The Amino Acid Fermentation Tank, Xiaodong Hu, Qinglei Liu, Fuyu Liu, Dexin Zhang
Journal of System Simulation
Abstract: Based on the Euler - Euler two-fluid model and population balance model, using MRF (multiple reference frame) method, the flow field of the rushton turbine stirred reactor and airfoil axial flow stirred reactor in fermentation tank is analyzed by Fluent. The information of the oxygen content and the size of bubble in the tank is obtained. The simulation results show that the axial flow produced by the airfoil axial flow stirred reactor and the radial flow produced by the rushton turbine stirred reactor interact with each other. The oxygen distribution is relatively uniform. There is an oxygen concentration near …
Multi-Tasks Channel Selection Algorithmic Modeling Based On Svm-Rfe, Jiankui Feng, Jin Jing, Wang Bei, Yugang Niu, Xingyu Wang
Multi-Tasks Channel Selection Algorithmic Modeling Based On Svm-Rfe, Jiankui Feng, Jin Jing, Wang Bei, Yugang Niu, Xingyu Wang
Journal of System Simulation
Abstract: Channel selection is used to locate the mental task related brain area in the brain computer interface systems. In the previous studies, the channels were selected based on the data recoded from the multi-mental tasks. However, the different mental tasks are corresponding to the different brain area. If one same brain area is selected for different mental tasks, the features of one mental task would be noises of another mental task. In this paper, a new method was presented to solve this problem based on the data of motor imagery tasks. The SVM-RFE method was used to select the …
Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang
Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang
Journal of System Simulation
Abstract: Since modern combats represent the development trend of systematization and network, it has become an essential requirement to build and use the equipment through a system-of-systems approach. The evaluation of contribution ratio to system-of-systems (CRSOS) is an important means to advance the development of weapon equipment systematization, and it is also urgently needed to carry out in-depth research on the theoretical concepts and methods. This paper establishes the research framework of CRSOS from the classification of contribution type and the equipment management life cycle. It proposes a CRSOS definition from the perspective of capability-efficiency dimension based on current …
Research On The Conceptual Modeling Of Coa For Analysis Of Wargaming, Zhaopeng Liu, Shaojun Liu, Guangya Si, Zhou Wen
Research On The Conceptual Modeling Of Coa For Analysis Of Wargaming, Zhaopeng Liu, Shaojun Liu, Guangya Si, Zhou Wen
Journal of System Simulation
Abstract: On the background of the Campaign COA analysis with simulation system wargaming, aiming at the information sharing problem in the course of wargaming, the composition and difference of the domestic and foreign COA are deeply analyzed, and the development trend of the COA modeling methods are also analyzed. The COA models are divided into the conceptual models and the solution models for the first time, and the limitation of the current COA conceptual models is analyzed with this viewpoint. For the characteristics of across the campaign level and tactical level during the process of the COA wargaming, utilizing …
Research And Realization Of 3d Scene Modeling In Chemical Industry Park, Hongyue Zhu, Bin Chen, Xiaodong Wang, Rongxiao Wang, Zhengqiu Zhu, Xiaogang Qiu
Research And Realization Of 3d Scene Modeling In Chemical Industry Park, Hongyue Zhu, Bin Chen, Xiaodong Wang, Rongxiao Wang, Zhengqiu Zhu, Xiaogang Qiu
Journal of System Simulation
Abstract: Aiming at the visualization of atmospheric pollution monitoring data in chemical parks, the method of 3D modeling in chemical industry parks is studied, and a remote-web-login and realistic three-dimensional visual information management system based on GIS remote sensing data and sensors’ monitoring data is realized. For simple objects such as buildings, rapid modeling based on GIS data is used; for complex objects such as chemical devices, 3ds Max and UAV tilt photography are combined to model; in terms of visualization, Cesium-based web front-end development technology is adopted. By adopting the above modeling methods in combination, not only the repetitive …
Evaluation Of Contribution Of Army Combined Arms In All-Domains Weapon System-Of-Systems Based On Critical Capability, Xiaochao Qian, Tang Wei, Chen Wei, Yingbo Lu, Zhifeng Lu
Evaluation Of Contribution Of Army Combined Arms In All-Domains Weapon System-Of-Systems Based On Critical Capability, Xiaochao Qian, Tang Wei, Chen Wei, Yingbo Lu, Zhifeng Lu
Journal of System Simulation
Abstract: To support equipment development demonstration of the army combined arms in all-domains weapon system-of-systems, an evaluate method of weapon system-of-systems contribution based on critical capability is studied. The critical capability of the army combined arms in all-domains weapon system-of-systems is analyzed based on the operational mission. A specified scenario of the army combined arms in all-domains weapon system-of-systems is given and the simulation system is constructed. The evaluation index systems and computation model of efficiency of the army combined arms in all-domains weapon system-of-systems are established under the specified scenario. The evaluation result can support the development demonstration …
Modeling, Simulation And Realization Of Writing System Based On Bci Technology, Chen Chao, Ping Yao, Bin Hao, Xu Rui
Modeling, Simulation And Realization Of Writing System Based On Bci Technology, Chen Chao, Ping Yao, Bin Hao, Xu Rui
Journal of System Simulation
Abstract: In order to solve the problem of insufficient information transmission and interaction between organisms and electromechanical devices in the integrated system of vital electricity, Emotiv EPOC and mechanical arm of eeg acquisition equipment were used to build a writing system based on brain-computer interface technology with faster information transmission rate The system modeling and simulation were conducted. In the system modeling, the frequency identification of steady-state visual evoked potential was carried out by a combination of bandpass filtering and Canonical Correlation Analysis algorithm, and the accuracy rate of the four classifications was as high as 91.6%. In the online …
Think Of The Dynamic Data Driven Application Systems In Simulation: From Physics Domain To Social Domain, Bin Chen, Yiping Wang, Xiaogang Qiu, Liu Liang, Ma Liang
Think Of The Dynamic Data Driven Application Systems In Simulation: From Physics Domain To Social Domain, Bin Chen, Yiping Wang, Xiaogang Qiu, Liu Liang, Ma Liang
Journal of System Simulation
Abstract: Dynamic data driven application systems (DDDAS) is an important part in the intelligent ACP based experimental approach. With the development of information technologies such as big data, intelligent learning, game play theory, the modes of application of DDDAS in simulation cases have changed a lot. In order to meet the requirements of the researches in both physics domain and social domain, the applications of DDDAS in classical cases are summarized. The data assimilation in the two physics cases is illustrated in detail. Then the cases in social domain which is focused by safety science are also discussed. The …
Uncertainty Quantification Method For Aircraft Using Pce Model, Liu Bo, Xiaobing Shang, Chao Tao, Ping Ma, Yang Ming
Uncertainty Quantification Method For Aircraft Using Pce Model, Liu Bo, Xiaobing Shang, Chao Tao, Ping Ma, Yang Ming
Journal of System Simulation
Abstract: In order to study uncertainty quantification of aircraft, which has the characteristics of many uncertainty parameters, complex model structures, and so on, an uncertainty quantification method based on polynomial chaos expansion is proposed. A method based on multi-dimensional polynomial chaos expansion (PCE) is used as an agent model to approximate aircraft so as to reduce the amount of calculation of transmitting by the vehicle dynamic system from uncertainty parameters. The Sobol index of the global sensitivity is calculated based on the approximate agent model. An example is presented to demonstrate the effectiveness of the polynomial chaos expansion method …
Computational Model And Analysis Of Parachute’S Opening Load In Rocket Sled Experiments, Conglei Wang
Computational Model And Analysis Of Parachute’S Opening Load In Rocket Sled Experiments, Conglei Wang
Journal of System Simulation
Abstract: The multi-bodies method with mass-spring damper model is used to analyze the parachute opening load in the rocket sled experiments. Results show that the computational model can be used to predict the opening load variation in rocket sled experiments. The computed maximum value and moment of opening load agree well with the experiment data. At the same time, the influences of fore-body mass and deploy velocity on the inflation load are analyzed. The analysis shows that in the range of 200~450 km/h, the peak value of the inflation load increases with the increase of the deploy velocity, and …
Facial Feature Points Tracking System And Simulation Analysis, Mingze Yuan, Shihong Xia
Facial Feature Points Tracking System And Simulation Analysis, Mingze Yuan, Shihong Xia
Journal of System Simulation
Abstract: Obtaining facial feature points from images are one of the fundamental research issues in computer vision and graphics. At present, most of face alignment methods obtain the position information of face feature points from a single static picture, i.e., a single still picture detection. Although these methods have obtained relatively accurate detection results, in the detection of feature points of continuous picture sequences, the feature point jitter may occur due to environmental changes such as illumination and background. Therefore, an embedded tracking system for a human face feature points is constructed using a tracking-based method for acquiring facial feature …
Cloud Job Scheduling Model Based On Improved Plant Growth Algorithm, Li Qiang, Xiaofeng Liu
Cloud Job Scheduling Model Based On Improved Plant Growth Algorithm, Li Qiang, Xiaofeng Liu
Journal of System Simulation
Abstract: The performance of cloud job scheduling algorithm has a great importance to the whole cloud system. The key factors that affect cloud operation scheduling are found out, and a resource constraint model is established. The existing simulation plant growth algorithm is improved based on the Logistic model of plant growth law, so that the plant growth way was made to change according to the energy power. The comparison of four different plant models was carried out and their different features were analyzed. Compared with 6 typical cloud job scheduling algorithms, it is concluded that the improved simulation plant growth …
Application Tests Of Mudis In Surface Ship Operation Training Simulation System, Xu Jing, Zhengxiang Xiong, Yongsheng Zhang, Xu Ming
Application Tests Of Mudis In Surface Ship Operation Training Simulation System, Xu Jing, Zhengxiang Xiong, Yongsheng Zhang, Xu Ming
Journal of System Simulation
Abstract: To meet the network communication demands of surface ship operation training simulation system, a multi-layer distributed service data interaction RTI was developed, which supported several system frameworks; and the main functions of HLA and DDS standards were realized. The distributed service with multiple key points was adopted; the data with several frequency response mechanisms and intelligent communication methods were provided; and the active analysis of data communication behavior was obtained. It had error-tolerance and adaptive load balancing capabilities. The MuDIS tests on data control, real-time data communication, time advance request delay, error-tolerance performance and so on were carried out …
Simulation-Based Acquisition Platform For Complex Equipment, Huiyang Qu, Yaoqin Zhu, Ruiying Pu, Junhua Zhou, Guoqiang Shi
Simulation-Based Acquisition Platform For Complex Equipment, Huiyang Qu, Yaoqin Zhu, Ruiying Pu, Junhua Zhou, Guoqiang Shi
Journal of System Simulation
Abstract: Based on the architecture of the simulation-based acquisition platform and the integrated modeling technology, the modeling and simulation technology based on virtual prototype is described. The modeling and simulation techniques for reliability, maintainability and supportability, and for the acquisition project management across the life-cycle are elaborated. Based on an aerospace complex equipment acquisition project, the application of the simulation-based acquisition platform in the aerospace equipment demonstration, development and support phase is introduced.
Low-Rank Sparse Joint Representation For Moving Object Detection In Video, Yang Lei, Pang Fang, Huosheng Hu
Low-Rank Sparse Joint Representation For Moving Object Detection In Video, Yang Lei, Pang Fang, Huosheng Hu
Journal of System Simulation
Abstract: For the video sequences with fixed cameras, it is a reasonable assumption that the fixed background has low-rank characteristic, and the dynamic foreground has sparse characteristic. A new motion detection method based on low-rank and sparse joint representation is proposed in this paper. The ideas of the proposed method are described as follows: The noise of video sequence is removed by image preprocessing. The optical flow between continuous video sequences is estimated, which is used to generate a binary motion mask as a movement weight matrix. An optimization model with low-rank background and sparse foreground is established based …
Mining And Validation Of Attacking Behavior In The Robocup 2d Simulation, Chen Bing, Zhang Heng, Zekai Cheng, Dong Peng, Lin Chao
Mining And Validation Of Attacking Behavior In The Robocup 2d Simulation, Chen Bing, Zhang Heng, Zekai Cheng, Dong Peng, Lin Chao
Journal of System Simulation
Abstract: Robocup is an international academic competition which focuses on artificial intelligence and robotics. The 2D simulation is one of the earliest and most influential projects in Robocup. Attacking is the core behaviour of the simulated football game, as well as the attack recognition is considered as an important part in team-confrontations. This paper selects some active and contribution index of attacking, extracts lots of attacking behaviour data of the key agents, proposes two kinds of attacking patterns of 2D simulation, as ‘separate attack’ and ‘cooperative attack’, according to the human-player actions. The following simulation tests give the accuracy of …
Real-Time Reconstruction And Simulation Of Police Dog Posture Based On Multi-Sensor Data Vest, Chaozheng Zhu, He Ming, Yang Sheng, Yang Cheng, Zhenhua Song
Real-Time Reconstruction And Simulation Of Police Dog Posture Based On Multi-Sensor Data Vest, Chaozheng Zhu, He Ming, Yang Sheng, Yang Cheng, Zhenhua Song
Journal of System Simulation
Abstract: Real-time police dog posture reconstruction provides an intelligent, convenient and over-the-horizon interactive way for police on duty with dogs. For the biological movement characteristics of police dogs, a new multi-sensor dog data vest was designed and implemented. Based on multiple small size and low power consumption sensors, a new police dog motion fusion method was proposed to capture the different posture data of police dogs, including standing, sitting and prone position, etc. For frequent jitter of police dogs, this paper proposed a method of dog posture reconstruction based on multi-sensor data vest, and introduced an improved kernel function ELM …
Uncalibrated Visual Servoing Based On Kalman Filter Optimized By Spsa, Jinqiang Zhang, Xianxia Zhang
Uncalibrated Visual Servoing Based On Kalman Filter Optimized By Spsa, Jinqiang Zhang, Xianxia Zhang
Journal of System Simulation
Abstract: Considering the problem of robot uncalibrated visual servoing, this paper presents a method for online estimation of image Jacobian matrix based on Kalman filter optimized by simultaneous perturbation stochastic approximation algorithm. This method takes the robot image Jacobian matrix as the system state, and uses Kalman filter to observe the system state. In order to improve the performance of the filter, the simultaneous perturbation stochastic approximation algorithm is used to optimize the filter parameters. This method is used to estimate the image Jacobian matrix and to design the control strategy, which can avoid complicated system calibration process. The simulation …
Construction And Application Of Low Altitude Multi-Path Simulation System Based On Volume Distributive Target Simulation, Xiaolei Wang, Baiting Liu, Chaolei Wang, Zhaowei Yang, Yuhui Tao
Construction And Application Of Low Altitude Multi-Path Simulation System Based On Volume Distributive Target Simulation, Xiaolei Wang, Baiting Liu, Chaolei Wang, Zhaowei Yang, Yuhui Tao
Journal of System Simulation
Abstract: With the continuous development of broadband high-resolution radar technology, the existing simulation technology cannot meet the needs of complex RF target and low altitude multi-path simulation with multi scattering center characteristics. The paper takes broadband high-resolution RF imaging guidance system as application background. A method for constructing a low altitude multi-path semi-physical simulation system based on volume distributive target simulation is put forward. The RF complex volume distributive target control model and low altitude multi-path simulation control model are developed. A hardware-in-the-loop system with low altitude multi-path simulation is constructed. The experimental results show that the simulation model …
Modeling And Simulation Of Pem Fuel Cell / Battery Hybrid Vehicle, Guizhi Sun, Sam Park, Zhongling Lin
Modeling And Simulation Of Pem Fuel Cell / Battery Hybrid Vehicle, Guizhi Sun, Sam Park, Zhongling Lin
Journal of System Simulation
Abstract: This paper describes modeling of a hybrid power system that supplies energy to an electric vehicle based on a hybrid system that uses a proton exchange membrane (PEM) fuel cell as a primary energy source and a battery pack as an ancillary energy storage system. A threshold approach has been employed for power control. When the power required by the vehicle exceeds a threshold, the battery works with the fuel cell to satisfy the dynamic response of vehicle. Otherwise the fuel cell works alone with regenerative braking enabling recharging of battery capacity. The proposed model has been simulated and …
Human Action Recognition Based On Depth Image, Tang Chao, Miaohui Zhang, Li Wei, Cao Feng, Xiaofeng Wang, Xiaohong Tong
Human Action Recognition Based On Depth Image, Tang Chao, Miaohui Zhang, Li Wei, Cao Feng, Xiaofeng Wang, Xiaohong Tong
Journal of System Simulation
Abstract: Because of the complexity and non-rigidity of human actions, traditional human action recognition based on RGB video data is a very challenging research topic. According to some deficiencies of existing recognition method based on RGB video data, a novel human action recognition method is proposed based on depth image data. In this new method, the block mean feature in the depth difference motion historical image is fused with the Gabor feature as mixed features and then a rotation forest algorithm is used to model. The experimental results show that the proposed method is simple, fast and efficient compared …
Design And Research On Mechanism Model Of Cyclone, Zhang Yue, Han Pu
Design And Research On Mechanism Model Of Cyclone, Zhang Yue, Han Pu
Journal of System Simulation
Abstract: The operating characteristics of the cyclone separator greatly affect the overall operating efficiency of the boiler, the gas-solid two-phase flow in the cyclone separator is complicated by the vortex flow. The mathematical model of different angles has been too complicated or one-sided to show its running mechanism. A mechanism model of the internal parameters of a cone assembly and a counter current cyclone separator has been established. The three cutting diameter calculation methods have been compared for grade separation efficiency. The pressure drop has been combined with the pressure drop of the subdivision of the system structure, and the …
Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui
Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui
Journal of System Simulation
Abstract: In order to improve the production process quality of four-roll plate bending machines, a four-roll bending mathematical model is established and a finite element simulation is used to verify its accuracy. The influence of side roller displacement, sheet thickness, and rotational speed on the radius and quality of the final shaped plate are analyzed. The simulation results show that as the displacement of side roll increases, the downtrend of the sheet forming radius gradually slows down and the quality of the formed sheet also decreases. Plastic strain fluctuation on plate surface decreases as the thickness increases, quality of thick …
Application Of Stochastic Petri-Net In Dynamic Evaluation Of Ecological Environmental Vulnerability In Mining Area, Guangqiu Huang, Quanchen Liu, Qiuqin Lu
Application Of Stochastic Petri-Net In Dynamic Evaluation Of Ecological Environmental Vulnerability In Mining Area, Guangqiu Huang, Quanchen Liu, Qiuqin Lu
Journal of System Simulation
Abstract: In order to establish the simulation model of vulnerable process of ecological environment in mining and evaluate ecological environment vulnerability dynamically, stochastic Petri-net (SPN) was adopted. The place set was divided into destruction state set, repair state set and virtual place set. Ways of representation and calculation method of these three types of places were given respectively. The state value of a place was to record actual change quantity of this place. The calculation of vulnerability was integrated into network system running naturally. Vulnerability algorithm based on SPN was given. In case study, a simplified SPN model …
Analysis Of Uas Avoidance Warning Criteria Based On "Τ-Τ", Zhiwei Zhang, Jianwu Tao, Shao Xiao
Analysis Of Uas Avoidance Warning Criteria Based On "Τ-Τ", Zhiwei Zhang, Jianwu Tao, Shao Xiao
Journal of System Simulation
Abstract: In the process of UAV avoiding obstacles, the tau warning logic based on time is introduced. Based on the tau warning logic, the τ-τ warning logic is proposed, and the equal τ-τ warning curve is constructed. According to the range of maneuver of the own UAV, three warning areas are defined, including high-risk area, low-risk area and non-risk area. Aiming at the two planes in the case of parallel encounter and vertical encounter, in accordance with three different situations of the UAV’s speed greater than, equal to and less than the intruder’s speed, the method simulates the warning …
Cfd Based Analysis And Improvement Of The Flow Field Of Stirred Tank Reactor For Crystallization, Zewen Ma, Liu Tao, Xudong Sun
Cfd Based Analysis And Improvement Of The Flow Field Of Stirred Tank Reactor For Crystallization, Zewen Ma, Liu Tao, Xudong Sun
Journal of System Simulation
Abstract: The computational fluid dynamics (CFD) method is adopted to analyze the flow field of 1L stirred tank reactor for crystallization. A popular CFD software named FLUENT is used to analyze the influence of a single layer turbine agitator on the flow field in a stirred tank reactor. The standard turbulence model of k-ε is employed to simulate a three-dimensional single-phase flow field of water solution. Simulation studies indicate that the simulated flow field is consistent with real distribution of the flow field, while it is seen that uniform blending can be achieved in the lower and middle parts of …
Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu
Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu
Journal of System Simulation
Abstract: Aiming at the uncertainty of the dynamics system of reconfigurable manipulator, a control law based on the fuzzy adaptive algorithm is proposed to adaptively approach the friction and external disturbance in the system, achieving the compensation control of the reconfigurable robot arm. At the same time, the robust items are added in the control law in order to improve the compensation precision and anti-interference performance of the control law, and reduce the approximation error of the algorithm. By Lyapunov stability theory, it is proved that the proposed fuzzy adaptive control law and the robust fuzzy adaptive control law can …
Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li
Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li
Journal of System Simulation
Abstract: As only small proportion of labeled data can be obtained from chemical processes, an online soft sensing modeling method based on semi-supervised locally weighted partial least squares is proposed . The labeled and unlabeled historical data are accumulated to construct training database. The similarity between the newly measured data and the sample points in the database are calculated and used as the weight of each data point. The semi-supervised locally weighted partial least squares model is constructed, and the Expectation Maximization (EM) algorithm is employed to estimate the parameters of the model. Online prediction achieves simulation results of debutanizer …
Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin
Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin
Journal of System Simulation
Abstract: Aiming at the problem that the conventional historical data modeling method can not overcome the influence of disturbance on modeling accuracy, a historical data modeling method based on state observation is proposed. In this method, the data with the characteristic from dynamic to steady state are selected from the historical data as the modeling data, which is subjected to zero initialization processing based on the final steady state value. The processed data is then divided into two segments. The first segment is used to track the state of the prediction model, and the final observed state is used as …