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Articles 121 - 150 of 864
Full-Text Articles in Systems Science
Simulation Research On Operation Effect Of Vav Air-Conditioning System With Variable Water Temperature Strategy, Qinglong Meng, Zhibo Zhang, Xiong Cheng
Simulation Research On Operation Effect Of Vav Air-Conditioning System With Variable Water Temperature Strategy, Qinglong Meng, Zhibo Zhang, Xiong Cheng
Journal of System Simulation
Abstract: Aiming at the problem of coordinated operation between VAV (variable air volume) and variable water temperature in central air conditioning system, a TRNSYS dynamic simulation model of air conditioning system with adjustable air supply and water supply temperature is established, and the accuracy of the model is proved by experiments. By controlling the terminal air volume to simulate the effect of variable water temperature operation on the air conditioning system under different load rates, the optimal water supply temperature of the air conditioning system under different load rates is obtained, and the variable water temperature operation strategy of the …
Synthetic Aperture Ultrasonic Imaging Algorithm Based On Robust Capon Beamforming In Eigenspace, Yecai Guo, Xiaoxing Ji
Synthetic Aperture Ultrasonic Imaging Algorithm Based On Robust Capon Beamforming In Eigenspace, Yecai Guo, Xiaoxing Ji
Journal of System Simulation
Abstract: In order to lower the main lobe width and side lobe amplitude of SAF beams ,improve the robustness of ultrasound imaging algorithm, resolution, contrast in images, a synthetic aperture ultrasonic imaging algorithm based on robust Capon beamforming in eigenspace is proposed. Under the principle of MV, this algorithm firstly uses the Toeplitz to realize the reconstruction of the interference-noise covariance matrix and keep it nonsingular. Secondly, the vector error is constrained by the signal subspace and the elliptic constraint set in feature space. Finally, the optimal weight vector which is used to weight and image the echo data is …
Differential Evolution Quantum Particle Swarm Optimization For Parameter Estimation Of Fractional-Order Chaotic System, Dong Ze, Ma Ning
Differential Evolution Quantum Particle Swarm Optimization For Parameter Estimation Of Fractional-Order Chaotic System, Dong Ze, Ma Ning
Journal of System Simulation
Abstract: In order to accurately estimate the unknown parameters for fractional order chaotic systems, a quantum particle swarm optimization algorithm based on differential quantum properties is proposed. On the basis of quantum behaved particle swarm optimization, variation, crossover and selection operation are utilized by particles, which can better keep the diversity of the particles in the population, avoiding the local optimum in the later phase of the iteration. The multi-neighborhood local search strategy is used for particles’ local search to improve search precision. Standard test functions are used to test the algorithm, and the test results show that the …
The Simulation Of Ac Servo Network Control System, Wang Lin, Chongquan Zhong
The Simulation Of Ac Servo Network Control System, Wang Lin, Chongquan Zhong
Journal of System Simulation
Abstract: The networking trend of AC servo system is becoming more and more remarkable. The research on permanent magnet synchronous motor(PMSM) mainly focuses on the continuous improvement of control strategy. It is rarely combined with solving real network delay and packet loss problems. The vector control strategy of PMSM is studied. In view of the delay and packet loss in the network environment, the mathematical model of network control system (NCS) is derived, and a simulation model based on TrueTime and Simulink is established to simulate the delay and packet loss phenomenon in the network transmission. The results show that …
Multi-Objective Model Of Distribution Route Problem For Fresh Electricity Commerce Under Uncertain Demand, Zhang Qian, Xiong Ying, Mingke He, Zhang Hao
Multi-Objective Model Of Distribution Route Problem For Fresh Electricity Commerce Under Uncertain Demand, Zhang Qian, Xiong Ying, Mingke He, Zhang Hao
Journal of System Simulation
Abstract: Considering the distribution cost, freshness of fresh products, carbon emissions and customer demand uncertainty and other factors, a multi-objective optimization model of distribution path planning is established. Based on the robust optimization method for dealing with uncertain problems, the multi-objective model of distribution routing planning is optimized for the situation that the discrete demand belongs to the uncertainty set of ellipsoid. The model is solved by using the main target method and fruit fly algorithm. It is proved that the model and algorithm are robust and can effectively suppress the disturbance caused by the uncertainty of the demand. This …
Research On Urban Rail Transit Route Choice Decision Based On The Improved Imperialist Competition Algorithm, Xiaofeng Lian, Ye Lu, Wang Yan, Limin Jia, Huiru Ma
Research On Urban Rail Transit Route Choice Decision Based On The Improved Imperialist Competition Algorithm, Xiaofeng Lian, Ye Lu, Wang Yan, Limin Jia, Huiru Ma
Journal of System Simulation
Abstract: This paper proposes a method of passenger route selection based on the imperialist competition improvement algorithm (FAST-ICA) to improve the efficiency of passenger route selection. Six key factors influencing the choice of passenger route are selected. On this basis, the generalized travel cost function is constructed and the passenger route selection model is established. By improving the imperial competition way in the imperialist competition algorithm (ICA), the weakest imperial groups are quickly divided up in each iteration of ICA algorithm to accelerate the convergence rate. Based on the proposed FAST-ICA algorithm, the problem of passenger choice in different environments …
Multi-Channel Transmission Optimization Of Campus Internet Of Things Based On Pheromone Genetic Algorithm, Zhiyong Chen, Liu Hao
Multi-Channel Transmission Optimization Of Campus Internet Of Things Based On Pheromone Genetic Algorithm, Zhiyong Chen, Liu Hao
Journal of System Simulation
Abstract: Aiming at the difficulty in selecting and optimizing the multi-path transmission of campus Internet of Things information, an optimization algorithm of network multi-path transmission based on intelligent optimization algorithm is proposed. Based on the standard genetic algorithm and the concept of pheromone concentration in ant colony algorithm, this algorithm improves the global optimization ability and convergence efficiency by controlling the evolution direction of individuals, and designs and constructs an evaluation index mathematical model which conforms to the characteristics of multi-channel information transmission optimization in the Internet of Things. The mathematical model of the evaluation index realizes the multi-channel comprehensive …
Wood Surface Defect Detection Based On Adaboost And Cnn, Hongjun Wang, Zouzou Li, Xiangjun Zou
Wood Surface Defect Detection Based On Adaboost And Cnn, Hongjun Wang, Zouzou Li, Xiangjun Zou
Journal of System Simulation
Abstract: In order to obtain the location information and category information of wood surface defects in the early stage of intelligent wood cutting, a combined algorithm for fast identification and location of wood surface defects is proposed based on digital image processing technology for fast recognition and location of wood surface defects. The Adaboost cascade classifier algorithm is used to extract the candidate frames of the wood surface defect region in the image in order to solve the problem that the traditional segmentation method is not effective for multi objects processing. A CNN model with self-learning ability is used to …
Joint Resource Partitioning And Offloading Analysis In Heterogeneous Ultra-Dense Networks, Zhen Yan, Jiangpan Shi, Qiaoshou Liu
Joint Resource Partitioning And Offloading Analysis In Heterogeneous Ultra-Dense Networks, Zhen Yan, Jiangpan Shi, Qiaoshou Liu
Journal of System Simulation
Abstract: For the problem of load balancing between macro base station and small base station in heterogeneous ultra-dense networks, a general offloading framework is proposed based on the distance between users and the nearest base station. By partitioning network spectrum resource and using stochastic geometry, the expression of coverage probability and average ergodic rate of users in the fixed region and the random region are deduced on the basis of guaranteeing the quality of service of the macro users offloaded. The simulation results show that the combination of resource partitioning and offloading effectively improves the coverage probability and average ergodic …
Research On Fluid Dynamics Simulation Of Welding Pool Based On Sph Method, Benkai Xie, Zhou Qiang, Li Qin, Ruijun Lin
Research On Fluid Dynamics Simulation Of Welding Pool Based On Sph Method, Benkai Xie, Zhou Qiang, Li Qin, Ruijun Lin
Journal of System Simulation
Abstract: In the development of virtual welding training equipment, real-time interactive simulation of weld forming is the key technology. The current simulation method of weld formation is studied in this pape..For the problem of long time computation and no sense of fluid motion in weld simulation process, a simulation method of weld forming simulation based on smooth particle hydrodynamics is proposed. This method includes the calculation of temperature field which can calculate the fluid particle temperature and modify the updating step of fluid particles according to the temperature of fluid particles. This can realize the transformation of fluid particles from …
Power Quality Disturbance Recognition Base On Maximum Variance Unfolding, Linlin Che, Yinghui Kong, Zhixiong Chen
Power Quality Disturbance Recognition Base On Maximum Variance Unfolding, Linlin Che, Yinghui Kong, Zhixiong Chen
Journal of System Simulation
Abstract: In view of the complexity of power quality disturbance (PQD), a recognition method of PQD feature extraction method based on maximum variance unfolding (MVU) is proposed and PQD recognition is completed by combining classifier algorithm in this paper. The wavelet energy features of PQD are extracted by wavelet transform to construct the original feature set.For the reason that non-convex quadratic programming is transformed into convex semi-definite optimization problem by kernel function, the MVU method is applied to compress the sample features into 3-dimension features which keep low dimensional structure in high dimensional space and make a rough recognition of …
Research On Fast Acquisition Algorithm For High Bit Rate Spread Spectrum System, Aizhen Wang, Meisong Luan, Hu Jiao, Zhumei Tian, Guofeng Ren
Research On Fast Acquisition Algorithm For High Bit Rate Spread Spectrum System, Aizhen Wang, Meisong Luan, Hu Jiao, Zhumei Tian, Guofeng Ren
Journal of System Simulation
Abstract: In a high-bit-rate spread spectrum communication system, due to the limitation of hardware processing speed, traditional acquisition methods cannot accomplish quick capture of PN code. In order to solve this problem, parallel structure is usually used in high-bit-rate receivers. In this paper, several traditional acquisition methods are analyzed and compared, and a parallel fast acquisition algorithm based on PMF-FFT for large frequency offset is proposed. This algorithm is based on parallel matched filtering and parallel FFT, and can accomplish the capture of multiple code phases and frequency offsets simultaneously. The principle of the algorithm is deduced in …
Review Of The Weapon System Simulation Technology, Yan Jie, Wenxing Fu, Zhang Kai, Chen Kang, Xiaofei Chang, Zhang Tong, Bin Fu, Sijie Wu
Review Of The Weapon System Simulation Technology, Yan Jie, Wenxing Fu, Zhang Kai, Chen Kang, Xiaofei Chang, Zhang Tong, Bin Fu, Sijie Wu
Journal of System Simulation
Abstract: Nowadays, the simulation technology are playing a more and more important role in the whole life cycle of weapon system design and application. In this paper, the state of the simulation technology in weapon system design and application is reviewed. And then, to meet the requirement of some brand new warfare styles like combat in complex environment, man-machine cooperation, cyberspace operation, intelligent system operation, combat training, new concepts of weapon simulation are developed, new demand of weapon simulation is introduced and new problems that must be solved are discussed. At last, the necessity and development trend of the …
Simulation Analysis Of Viral-Style Information Diffusion In Small World Networks, Li Feng, Wei Ying
Simulation Analysis Of Viral-Style Information Diffusion In Small World Networks, Li Feng, Wei Ying
Journal of System Simulation
Abstract: Since the small world network is one of the most common complex networks in the real world, this paper focuses on information diffusion on the small world network platform. In order to explore the relationship between structural features of the small world network with a well-accepted feature for information diffusion, network coverage ratio named, the methodology of multi-agent based modeling and simulation is introduced, instead of mathematical modeling. Through simulation, the impact of only two parameters in the small world network generation algorithm, that is Watts-Strogatz algorithm, is analyzed, where the process of information diffusion acts as the …
Design And Simulation Analysis Of Epr Contract From The Perspective Of Government Regulation, Benhong Peng, Yuanyuan Wang, Tu Yu
Design And Simulation Analysis Of Epr Contract From The Perspective Of Government Regulation, Benhong Peng, Yuanyuan Wang, Tu Yu
Journal of System Simulation
Abstract: Government regulation is an important means to promote the extension of producer responsibility. Through the establishment of the agency model based on the public, the government and the producer, the situation of non-cooperation and the cooperation regulation between the public and the government respectively is modeled and analyzed, and the simulation is carried on. The study finds that the cooperation regulation is better than the non-cooperation regulation. The cooperation regulation should take into account the factors such as the risk aversion degree of the manufacturers, the uncertainty of the external environment, the cost coefficient, the comprehensive ability level, the …
Operation Control Method For Connected And Autonomous Vehicles At Intersection, Linguo Chai, Baigen Cai, Shangguan Wei, Wang Jian, Junjie Chen
Operation Control Method For Connected And Autonomous Vehicles At Intersection, Linguo Chai, Baigen Cai, Shangguan Wei, Wang Jian, Junjie Chen
Journal of System Simulation
Abstract: A novel approach for coordinating connected and autonomous vehicles at intersection is proposed in this paper. The road connecting the specific intersection is divided into two areas: status calculation area and status adjustment area. When the vehicle enters the status calculation area, LOOSE algorithm which is implemented in the infrastructure would be triggered to calculate the target status of the vehicle for it to avoid collision in the intersection. The results of LOOSE would be optimized by COMPACT algorithm with the objective of minimum queue length. And then operational suggestions for the vehicle to …
Application Of Myo Gesture Recognition Method In Ancient Building Roaming System, Yanping Xue, Xuesong Wang, Zhongke Wu, Xingce Wang, Mingquan Zhou
Application Of Myo Gesture Recognition Method In Ancient Building Roaming System, Yanping Xue, Xuesong Wang, Zhongke Wu, Xingce Wang, Mingquan Zhou
Journal of System Simulation
Abstract: Museum display many exhibits, but its display way is single. The ancient buildings are displayed by texts and pictures, so it cannot bring a realistic experience to the visitors. Therefore, the ancient architectural scene roaming based on Myo combined with virtual reality is proposed. Kaifeng Tower Park is used as an example to achieve the system. In the design, system gets visitors’ acceleration and gyroscope values of forward, turn, squat and stop by wearing Myo. SVM-based gesture recognition algorithm is designed to complete the classification of feature values. Contrast experiment is designed to verify accuracy and efficiency of …
Design And Analysis Of Sustained-G Flight Simulator Control Algorithm, Xiaoguang Zhou, Yihong Fang, Huaiying Tian, Mingzhi Yao
Design And Analysis Of Sustained-G Flight Simulator Control Algorithm, Xiaoguang Zhou, Yihong Fang, Huaiying Tian, Mingzhi Yao
Journal of System Simulation
Abstract: In order to solve the problem of mismatch exist between angular motions by Sustained-G Flight Simulator pilot through his proprioceptive receptors and visual receptors, the control algorithm of Sustained-G Flight Simulator is designed. The formulas relative to control input is derived; the mathematical model of human proprioceptive system is researched, the relationship between pilot's perceptual angular and rotating linear acceleration vectors and angular accelerations is given, based on that, the control algorithm of Sustained-G Flight Simulator is proposed, which can make a match existence between the angular motion perceived by Sustained-G Flight Simulator pilot and aircraft pilot. The simulation …
Research On Internal Resistance Monitor System Of Vehicle Fuel Cell Integrated With Dc/Ac/Dc, Deng Jian, Haiquan Lü, Liyan Zhang, Shuhai Quan
Research On Internal Resistance Monitor System Of Vehicle Fuel Cell Integrated With Dc/Ac/Dc, Deng Jian, Haiquan Lü, Liyan Zhang, Shuhai Quan
Journal of System Simulation
Abstract: In order to solve the problem of complicated and costly on-line impedance monitoring operation of vehicle fuel cells, a test method that can obtain the electrochemical impedance spectroscopy (EIS) of fuel cell by Fourier transformation against output voltage and output current of fuel cell through DC/DC generation of micro-current signal is proposed. This method is integrated in a cascaded system of parallel Boost and DC/AC/DC. The parallel Boost can realize the decoupling of power transmission and disturbance signal, the DC/AC/DC converters can achieve higher boost ratios, which makes the test system more suitable for higher voltage levels such as …
Control Optimization Of Hybrid System With Hybrid Power Based On Dp Algorithm, Deng Tao, Haoyuan Yu, Bin Xu
Control Optimization Of Hybrid System With Hybrid Power Based On Dp Algorithm, Deng Tao, Haoyuan Yu, Bin Xu
Journal of System Simulation
Abstract: Aiming at the complexity and diversity of energy management for HEV(hybrid electric vehicle) with hybrid power, taking the State of Charge of power battery and ultracapacitor as state variable, the torque distribution ratio between engine and motor, and the power distribution ratio between power battery and ultracapacitor as control variables, the fuel economy and emission performance as objective function, the Dynamic Programming (DP) control strategy for HEV with hybrid power is proposed. The working rules of the engine, motor, battery and ultracapacitor, are extracted from the results, and the rules of engine and motor and the fuzzy control …
Recurrent Cmacnn Control For Space Robot With Fully Flexible Arms And Elastic Base, Xiaoqin Huang, Chen Li
Recurrent Cmacnn Control For Space Robot With Fully Flexible Arms And Elastic Base, Xiaoqin Huang, Chen Li
Journal of System Simulation
Abstract: The trajectory tracking of elastic base and double flexible arms for a free-floating space robot system with fully flexible arms and elastic base is discussed. The elastic connection between the base and the arm is considered as a linear spring and dynamics model of the system which is regarded as a two- time scale system is derived. For the slow-varying subsystem, the recursive CMAC neural network (CMACNN) which has good dynamic characteristics is used to approximate uncertainties of dynamical equation and a recursive CMAC neural network control scheme which improves the tracking performance is designed to improve the …
Dynamic Matching Of Power Transmission Efficiency Of Bulldozer Under Operation Condition, Shengping Fu, Shengbo Li, Luo Ning
Dynamic Matching Of Power Transmission Efficiency Of Bulldozer Under Operation Condition, Shengping Fu, Shengbo Li, Luo Ning
Journal of System Simulation
Abstract: When a high-power bulldozer works with the heavy load for a long time, the efficiency of hydraulic mechanical transmission decreases obviously. To solve this problem, the dynamic simulation model of bulldozer power transmission is constructed based on modularization theory. And a dynamic match strategy of guaranteeing the high transmission efficiency is designed. Moreover, a load control model and a throttle opening control model are constructed. And then the optimizing design platform is established to confirm and optimize the PID parameters of load control and throttle opening control model adopting Isight and Matlab software. Eventually, hardware-in-the-loop test is designed and …
Nonlinear Sliding Mode Control For Robotic Manipulator Based On Disturbance Observer, Gensuo Mi, Huaqi Liang
Nonlinear Sliding Mode Control For Robotic Manipulator Based On Disturbance Observer, Gensuo Mi, Huaqi Liang
Journal of System Simulation
Abstract: A nonlinear sliding mode control strategy of manipulator based on disturbance observer is designed for the characteristics of the manipulator which is sensitive to internal parameter disturbance and the external disturbance in the position tracking. According to the system dynamics model and Lyapunov stability theory, the uncertainties and external disturbances of the system are observed by disturbance observer. At the same time, the nonlinear sliding mode controller is designed and the Lyapunov function is constructed to verify the stability of the system. On this basis, the system control law and the sliding mode control law are designed to compensate …
The Method Summary Of Generating Large-Scale Artificial Population In An Artificial Society, Yuanzheng Ge, Zhichao Song, Rongqing Meng
The Method Summary Of Generating Large-Scale Artificial Population In An Artificial Society, Yuanzheng Ge, Zhichao Song, Rongqing Meng
Journal of System Simulation
Abstract: The generation of large-scale artificial population is the fundamental data of high-resolution agent-based artificial society. By the comparison of typical artificial population models, the basic elements, generating methods, and evolving rules, the development of artificial society, generation of population database, the establishment of spatial-temporal relationship, evolving rules of behavior, and reconstruction of social relationship are analyzed. Furthermore, data-driven method and open interface framework of artificial population are discussed, and the future direction and development are listed.
A Review Of Modeling Human Travel And Social Contacts For Public Health Management, Duan Wei, Guo Gang, Bin Chen, Duan Hong
A Review Of Modeling Human Travel And Social Contacts For Public Health Management, Duan Wei, Guo Gang, Bin Chen, Duan Hong
Journal of System Simulation
Abstract: It is significant to understand the patterns of human mobility and social contacts for epidemic prevention and control. This paper analyses the regularities and the statistical properties of human behaviors at the perspective of human dynamics. Various models of human mobility and social contacts are comparatively investigated , including Brownian movement, random walks, spatial network, Motifs, bipartite graph model, gravity models, contact rate, the distribution of daily contact number, social networks, etc. The models of human behavior changes in the course of epidemic outbreak are also analyzed. The challenges of modeling human mobility and social contacts are discussed …
Research On Topology Mapping Method For Multiscale Integration Network Emulation, Liu Yuan, Changling Qiu, Xiaofeng Wang, Jiang Min
Research On Topology Mapping Method For Multiscale Integration Network Emulation, Liu Yuan, Changling Qiu, Xiaofeng Wang, Jiang Min
Journal of System Simulation
Abstract: For large-scale and scalable network emulation requirements, multi-scale integration emulation based on lightweight virtualization and full virtualization is the trend. In order to take into account the advantages of both virtualizations and enhance the performance of network emulation, a topology mapping method (TMMI) is proposed for multi-scale integration network emulation. This method divides the network topology into lightweight virtualization mapping area and integration virtualization mapping area, and according to different mapping areas uses the optimized multi-level partitioning method to map the network topology reasonably. Experiments show that the proposed method can effectively balance the load and communication overhead …
Research On Fuzzy Adaptive Somatosensory Algorithm For Flight Simulator, Wang Hui, Baofeng Zhang
Research On Fuzzy Adaptive Somatosensory Algorithm For Flight Simulator, Wang Hui, Baofeng Zhang
Journal of System Simulation
Abstract: In order to improve the dynamic fidelity of flight simulator and make full use of the working space, the corresponding improvement scheme of the classical washout algorithm is proposed based on the Stewart motion platform. A two-way fuzzy adaptive elution algorithm is proposed.The algorithm is more in line with the sensory model of the human body by combining the two-way filtering algorithm improvement and the one-dimensional fuzzy adaptive adjustment to compensate the displacement of the high-pass acceleration channel according to the fuzzy rule. The results show that the improved two-way fuzzy adaptive filtering algorithm improves the displacement space from …
Study On Ecological Compensation Of Three Gorges Basin Based On Evolutionary Game Theory, Guangming Yang, Yanjun Shi
Study On Ecological Compensation Of Three Gorges Basin Based On Evolutionary Game Theory, Guangming Yang, Yanjun Shi
Journal of System Simulation
Abstract: Under the background of the green development of the Yangtze River Economic Belt, based on the evolutionary game theory, the game model of the upstream and downstream governments of the Three Gorges Basin and the central ecological compensation behavior are constructed to analyze the interests appeal and compensation behaviors among the three parties, so as to have a complex interest game relationship in the Yangtze River and analyze the cases of ecological compensation in the Three Gorges Basin. The research shows that without the restriction of central government, it is difficult for the upstream and downstream governments in the …
Research On Vibration Characteristics And Parameters Influence Of A Nonlinear Vibration Absorber, Lilan Liu, Bolin Ren, Guodong Zhu
Research On Vibration Characteristics And Parameters Influence Of A Nonlinear Vibration Absorber, Lilan Liu, Bolin Ren, Guodong Zhu
Journal of System Simulation
Abstract: The bistable nonlinear electromagnetic vibration energy harvester (BNEVEH) is used as a vibration absorber to absorb harmful vibration and transfer it into useful electric energy. The mechanical model and governing equation of the main system with BNEVEH are established. The effect of Gauss white noise intensity on large amplitude motion is analyzed by simulations. And the effect law of mass ratio and tuning frequency ratio on the vibration reduction of the main system and power generation of bistable vibration absorber under Gauss white noise excitation is analyzed from the point of vibration reduction and vibration energy harvesting. The optimal …
High-Order Reconstruction Of Maneuvering Decision-Making Process In Close Air Combat, Ya’Nan Kou, Longting Jiang, Wang Dong
High-Order Reconstruction Of Maneuvering Decision-Making Process In Close Air Combat, Ya’Nan Kou, Longting Jiang, Wang Dong
Journal of System Simulation
Abstract: Aiming at the reconfiguration of maneuvering decision-making in air combat, an extraction model of key maneuvering decision-making points is constructed. Based on the actual aircraft flight status data, by introducing the concept of jerkiness degree in physics, four indexes of pitching Angle, yaw Angle, roll Angle and speed jerkiness, are selected to construct evaluation index system of key maneuvering decision point. By using the theory of information entropy , the relevant indexes are reduced and the comprehensive evaluation value are obtained. Then maneuvering area is divided according to time domain, the decision points are extracted, and maneuvering decision-making refactoring …