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2020

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Articles 1261 - 1290 of 1941

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Research On Force Compliance Of The Hydraulic Control System In Major-Motion Mechanism For Manipulator, Geqiang Li, Jingwei Zhang, Yuesong Li, Bin Zhou, Shuye Ma Jun 2020

Research On Force Compliance Of The Hydraulic Control System In Major-Motion Mechanism For Manipulator, Geqiang Li, Jingwei Zhang, Yuesong Li, Bin Zhou, Shuye Ma

Journal of System Simulation

Abstract: The force compliance method of the hydraulic control system in major-motion mechanism was proposed during the forging process. Taking the major-motion mechanism of the forging manipulator as the target, the inverse kinematics model of major-motion mechanism was established, and the dynamic model of hydraulic control system was built. Through taking the pressure as the controlled variable, the model of the lifting hydraulic control system was obtained by using the co-simulation technology. Based on the principle of the horizontal buffering system, the model of the buffering hydraulic system which was made up of the buffering cylinder and the accumulator …

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In-Cylinder Flow Analysis And Verification Of Opposed-Piston Two-Stroke Engine, Fukang Ma, Changlu Zhao, Zhenfeng Zhao, Wang Hao, Yu Xia, Cao Yan, Jiqing Zhang Jun 2020

In-Cylinder Flow Analysis And Verification Of Opposed-Piston Two-Stroke Engine, Fukang Ma, Changlu Zhao, Zhenfeng Zhao, Wang Hao, Yu Xia, Cao Yan, Jiqing Zhang

Journal of System Simulation

Abstract: The effects of flat piston uniform scavenging chamber, flat piston non-uniform scavenging chamber and pit piston non-uniform scavenging chamber on the in-cylinder flow were analyzed. Uniflow scavenging zero-dimensional model was used to qualitative analysis in-cylinder flow organizational process and influence rule for opposed-piston two-stroke engine. Results show that uniform scavenging chamber can organize swirl and increase scavenging efficiency and non-uniform scavenging chamber can organize tumble and increase turbulent kinetic energy. Scheme 3 is favorable to organize tumble and maintain the in-cylinder turbulence intensity, which is increased by 150 percent.

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Dfig Grid Connection Simulation Method Used For Transient Analysis Of Black-Start, Liqing Liu, Zengqiang Mi, Du Ping, Yuliang Wan, Yuan He Jun 2020

Dfig Grid Connection Simulation Method Used For Transient Analysis Of Black-Start, Liqing Liu, Zengqiang Mi, Du Ping, Yuliang Wan, Yuan He

Journal of System Simulation

Abstract: Establishing a grid connection model of doubly-fed induction generator based wind turbine (DFIG) could be useful in the research and verification of black-start strategy in isolated power grid containing wind power. A DFIG grid connection simulation method based on Simulink was proposed. Through analyzing the operation characteristics of doubly-fed induction generator in no-load and grid-connected conditions, its dual-operation simulation model was established. According to the grid-connection theory of DFIG, the established doubly-fed induction generator model was combined with wind turbine, converter and other built-in modules, and the DFIG grid connection model was built with its control system added. …

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Research On Intelligent Hauling Speed Regulation System Based On Shearer's Reliability, Xunan Liu, Lijua Zhao, Dongmin Gai, Zhangyu Du, Liangying Hao Jun 2020

Research On Intelligent Hauling Speed Regulation System Based On Shearer's Reliability, Xunan Liu, Lijua Zhao, Dongmin Gai, Zhangyu Du, Liangying Hao

Journal of System Simulation

Abstract: Under the mine, Shearer's hauling speed affected the shearer's efficiency and reliability. Taking MG32570*2/325-BWD shearer as research object, from shearer's reliability, by using Simulink, the intelligent speed regulation system was established, based on shearer key parts' reliability. The building & simulation of hauling motor load torque block and recommended optimum hauling speed generation block which was fitted by neural network was solved. The simulation results show that: this system can achieve the recommended speed, which is traced by hauling speed rapidly and accurately. When consistent coefficient and cutting depth are 2.85 and 0.58m, the hauling motor's maximum speed is …

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Eigen-Value Combination Approach For Speech Enhancement, Huijuan Lu, Yaqing Liu, Yanqiu Liu, Guan Wei Jun 2020

Eigen-Value Combination Approach For Speech Enhancement, Huijuan Lu, Yaqing Liu, Yanqiu Liu, Guan Wei

Journal of System Simulation

Abstract: In order to further suppress noise, a kind of speech enhancement algorithm based on Eigen-value merge was proposed. Eigen-values combination was used to improve the speech quality on the basis of the classic embedded pre-whitening subspace methods. The study shows that, after decomposing the covariance matrix of speech signals with noise, the larger Eigen-value component mainly includes speech information, and the smaller Eigen-value component mainly contains noise. Sorted by Eigen-values from small to big, the adjacent large Eigen-value component replaces with small Eigen-value component, which can effectively suppress noise and improve the quality of speech. Compared with other speech …

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Gm-Cphd Filter With State-Dependent Clutter, Lili Ma, Xiaoshan Qin, Jinguang Chen Jun 2020

Gm-Cphd Filter With State-Dependent Clutter, Lili Ma, Xiaoshan Qin, Jinguang Chen

Journal of System Simulation

Abstract: For many sensors the clutters observed are easier to concentrate in the area around targets, namely the state-dependent clutter, which is different from the known clutter distribution in traditional filtering algorithms. So, the accuracy the real-time performance and of traditional multi-target tracking will be greatly degraded. To solve this problem, a kind of GM-CPHD filter with state-dependent clutter was proposed. The relationship between clutter and state was modeled. The clutter intensity was recalculated according to the distribution of clutter in the whole surveillance area and applied to update process; at the same time, in order to reduce the time …

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Research On Static Behavior Of Xx-Joints Based On Ansys, Pan Ying, Linxiao Qin Jun 2020

Research On Static Behavior Of Xx-Joints Based On Ansys, Pan Ying, Linxiao Qin

Journal of System Simulation

Abstract: Nonlinear finite element analysis was used in the ultimate bearing capacity on planar XX-joints by ANSYS software. The stress distributions of the joints were demonstrated, the main failure modes of the joints were determined, and the influences of some fundamental geometric parameters on the ultimate strength were the research points. The results show β (diameter ratio of the branch to the chord), θ (axial angle of the chord and the branch), γ (the ratio of the diameter of the chord to the thickness of the walls of the chord) are the main …

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Research Of Impact Point Accuracy Of One-Dimensional Trajectory Correction Projectile Based On Monte Carlo, Xiaoyun Lei, Zhian Zhang Jun 2020

Research Of Impact Point Accuracy Of One-Dimensional Trajectory Correction Projectile Based On Monte Carlo, Xiaoyun Lei, Zhian Zhang

Journal of System Simulation

Abstract: After the one-dimensional trajectory correction projectile out of the muzzle, various disturbance factors caused the impact point dispersion. Monte Carlo method was utilized on the shooting accuracy analysis. Based on the practical test datasets, three major factors were determined, namely, time delay of opening-damper mechanism, error of drag coefficient and measurement error of target. As to the disturbances, function randn was used for the analysis of the three major factors on the flat of Matlab. According to error distribution of the factors, the probability distribution and dispersion of the impact point were obtained. The maximum and minimum ranges of …

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Potato Storage Temperature Prediction Control Based On Pso And Esns, Junxia Liu, Xinrong Xiong, Hu Bing Jun 2020

Potato Storage Temperature Prediction Control Based On Pso And Esns, Junxia Liu, Xinrong Xiong, Hu Bing

Journal of System Simulation

Abstract: According to the current situation of potato storage and serious waste of raw materials and human resources of potato processing enterprises, combined with temperature data characteristics of potato storage from Xinjiang Great Russell Agricultural Science and Technology Development LTD., and control effect of the conventional control methods which is not ideal, a new temperature predictive control method was proposed, which rolled to optimize the input control variable by using particle swarm optimization algorithm and get the actual output values, use ESNs to forecast the temperature in the storage, the system was corrected by deviation between forecasting output and actual …

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Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei Jun 2020

Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei

Journal of System Simulation

Abstract: A new method measuring the atmospheric parameters was proposed based on acoustic vector sensors located at the wing leading edge, and the atmospheric parameters model was set up based on the airflow velocity distribution sensed by acoustic vector sensor over wing leading edge. According to the symmetric, swept character of wings, velocity vector was decomposed to solve the non-linear equation of model. The expressions of angle of sideslip, angle of attack and free stream velocity were derived. The feasibility of the expressions was verified by wing simulation data from Fluent.

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Fractional Modeling And Simulation Analysis Of Single-Phase Pwm Rectifier, Zheng Zheng, Fangjun Ma, Yanfang Wei Jun 2020

Fractional Modeling And Simulation Analysis Of Single-Phase Pwm Rectifier, Zheng Zheng, Fangjun Ma, Yanfang Wei

Journal of System Simulation

Abstract: The modeling problem of single-phase PWM rectifier was studied, based on the fact that actual capacitance and inductance is the fractional in nature. The mathematical model of single-phase PWM rectifier was established by using fractional calculus theory, based on modeling method analysis of fractional Caputo definition and PWM rectifier topology. According to instantaneous power theory, for DC component value, the peak to peak value AC component, and the time of dynamic response of the DC side capacitor voltage were analyzed. In theory, DC component value does not change with the order number capacitance, while the AC component is opposite, …

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Modeling And Simulation Of Marine Traffic Macroscopic Flow Complexity, Yuanqiao Wen, Du Lei, Yamin Huang, Tengda Sun, Changshi Xiao, Chunhui Zhou Jun 2020

Modeling And Simulation Of Marine Traffic Macroscopic Flow Complexity, Yuanqiao Wen, Du Lei, Yamin Huang, Tengda Sun, Changshi Xiao, Chunhui Zhou

Journal of System Simulation

Abstract: To accurately describe the difficulty of cognitive traffic in the view of traffic managers, a method for quantitative calculation of marine traffic macroscopic flow complexity was proposed. The similar ships were cataloged into a traffic cluster; According to the historical traffic flow field by interpolation method, the aggregation complexity, the speed-diachronic complexity and the density-diachronic complexity were evaluated. The cognitive complexity was obtained by the marine traffic macroscopic flow complexity, showing the cognitive complexity in the macroscopic complexity map. The simulation experiment shows the macroscopic complexity model is available for demonstrating the distribution of complexity in space.

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Risk Simulation Analysis Of Runway Incursions Based On Multi Agents, Baojun Huang, Xiaodan Fang, Jiening Wang Jun 2020

Risk Simulation Analysis Of Runway Incursions Based On Multi Agents, Baojun Huang, Xiaodan Fang, Jiening Wang

Journal of System Simulation

Abstract: Nowadays, runway incursions are important problems affecting flight safety in airport surface operation. According to this problem, a new method was proposed for the risk analysis of runway incursion by using multi agent modeling theory, which established a risk analysis agent model of runway incursion. Pointing at typical scenarios for runway incursion incidents, LEADSTO (Language and Environment for Analysis of Dynamics by SimulaTiOn) language was applied to realize the accident simulation by temporal logic. Simulation results show that specification for pilot or controller behavior and alertness can avoid accidents occurrence. The proposed method can simulate dynamic system, which has …

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Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu Jun 2020

Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu

Journal of System Simulation

Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG k–ε turbulent model was used to close the two-phase flow time-averaged equations. The conditions properties of free hydraulic jumps on corrugated beds with a stilling basin under 9 kinds of conditions were studied by numerical simulation. Simulation research results show: There are vortexes generated by corrugated beds surfaces, rotating in the clockwise direction. The pressure distribution on corrugated beds in hydraulic jump region appears a wavy change, and the difference between the pressure values at adjacent crest and trough gradually decreases along …

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Dynamic Simulation For Tethered Trailer Vehicle, Chen Ning, Hongchao Ma Jun 2020

Dynamic Simulation For Tethered Trailer Vehicle, Chen Ning, Hongchao Ma

Journal of System Simulation

Abstract: Tethered trailer vehicle is a non professional tractor that drags an unpowered vehicle with hemp rope. This conduct has many problems: poor operating stability, and high incidence of traffic accident. A nonlinear dynamic model for longitudinal, lateral, and yaw motions was developed. The model considers nonlinearity through a modified Dugoff's tire friction model, and is seven-degree-of-freedom. A new nonlinear tethered tractor-trailer combination model was created to simulate critical parameters which would cause unstable state. Then, a trailer front-wheel steering feedback control strategy was derived with the goal of improving stability and trajectory tracking feature of the tractor-trailer system. The …

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Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity, Wenwei Zhan, Jingke Xi, Zhixiao Wang Jun 2020

Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity, Wenwei Zhan, Jingke Xi, Zhixiao Wang

Journal of System Simulation

Abstract: Fast Unfolding is a hierarchical community detection algorithm based on modularity. It runs very fast, but the accuracy needs to be improved. Because the algorithm adopts traditional modularity to merger communities, it only considers node link information and ignores the neighbor nodes. Therefore, two nodes that have common neighbors and weak link information may not be merged, thus affecting the accuracy. In view of the shortcomings, a hierarchical agglomerative community detection algorithm based on similarity modularity was proposed through introducing optimized similarity to improve the modularity. It adopts NMI as the accuracy measurement. Experiments on the real network …

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Study On Effect Of Neglecting Transient Terms Of Momentum Equations On Simulation Models Of Single Phase Heated Tubes, Yingwei Kang, Yanan Wang, Daogang Peng, Pengyuan Zheng, Yang Ping Jun 2020

Study On Effect Of Neglecting Transient Terms Of Momentum Equations On Simulation Models Of Single Phase Heated Tubes, Yingwei Kang, Yanan Wang, Daogang Peng, Pengyuan Zheng, Yang Ping

Journal of System Simulation

Abstract: A model of single phase heated tubes was presented, based on which the effect of neglecting transient terms of momentum equations on model performance was investigated by simulating a heated tube of the superheater of a power plant boiler. It is found that neglecting the transient terms of momentum equations can significantly decrease the dynamic accuracy of the model; under various step disturbances, neglecting the transient terms of momentum equations can speed up the dynamic response of the enthalpy-temperature channel of the model nearly 4 times; under the step disturbance of the inlet steam flux, neglecting the transient terms …

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Surrogate Model Based Processor Architectural Design Space Exploration Algorithm, Hongwei Wang, Ziyuan Zhu, Jinglin Shi, Yongtao Su, Hongmei Shi, Zhiguo Liu Jun 2020

Surrogate Model Based Processor Architectural Design Space Exploration Algorithm, Hongwei Wang, Ziyuan Zhu, Jinglin Shi, Yongtao Su, Hongmei Shi, Zhiguo Liu

Journal of System Simulation

Abstract: A novel surrogate model based penalty-distance multi-objective expected improvement (PDMOEI) algorithm was proposed for processor architectural design space exploration (DSE): first using a Kriging interpolation technique to construct a surrogate model, then adopting the surrogate model based PDMOEI algorithm to search the Pareto points and finding the globally multi-objective optimized architectural parameter configurations. The proposed algorithm was compared with the multi-objective expected improvement (MOEI) algorithm, the non-dominated sorting genetic algorithm II (NSGA-II) algorithm and the metamodel-assisted NSGA-II (MA-NSGA-II) algorithm by performing two experiments. Experimental results show that, the proposed algorithm achieves better Pareto points pursuing performance than …

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Research On Semi-Active Control Strategy Of High Speed Railway Pantograph-Catenary System Based On Model Predictive Control, Zhiling Ren, Lin Dong, Wang Yue, Guangquan Zhang Jun 2020

Research On Semi-Active Control Strategy Of High Speed Railway Pantograph-Catenary System Based On Model Predictive Control, Zhiling Ren, Lin Dong, Wang Yue, Guangquan Zhang

Journal of System Simulation

Abstract: For the pantograph catenary coupling problem, the semi-active control strategy of pantograph catenary system was proposed. According to the established pantograph catenary model and the contact force history data, it used the MPC prediction technique to predict the next moment of contact force. The predicted value and the theoretical value error were calculated, and the MPC controller output the calculated results to the ER damper. The change of the control input of the contact force was provided by the current damper, which made the actual value close to the theoretical value. Experimental results show that the semi-active …

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Coverage Path Planning Algorithm Based On Centroidal Power Diagram, Liping Zheng, Yajun Cheng, Lu Chang, Ting Liao Jun 2020

Coverage Path Planning Algorithm Based On Centroidal Power Diagram, Liping Zheng, Yajun Cheng, Lu Chang, Ting Liao

Journal of System Simulation

Abstract: Coverage path-planning algorithm is widely used in mobile sensor networks, multi-robot system, and other fields. The coverage path planning algorithm based on CCCPD(Centroidal Capacity Constrained Power Diagram) was studied. The classical Lloyd based generating method for Centroidal Power Diagram was extended to PD-Lloyd algorithm, which could be used for path-planning. Two optimizing strategies were proposed to enhance the credibility of the PD-Lloyd algorithm by considering the physical moving characteristics of individuals in the real scene. Experiments prove that the proposed algorithm has advantages of well stability and inherent collision-free characteristic, and can generate more optimal motion path.

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Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang Jun 2020

Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang

Journal of System Simulation

Abstract: Because of the influence of node's own state and other factors, the node in mobile P2P network often shows the selfishness and resource preference, which greatly affects the resource search efficiency of the network system. Aiming at this problem, a novel resource search mechanism was proposed based cooperation degree of nodes in selfish mobile Peer-to-Peer network. In the search mechanism, through the comprehensive evaluation of the node's information forwarding rate, the overall similarity and the core degree, the node with the highest degree of cooperation was selected as the relay node for information forwarding. At the same time, through …

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Analysis Of Static Equilibrium Workspace For Under-Constrainted Cable-Driven System With Multi-Robots, Zhigang Zhao, Li Wei, Youde Li, Yanlin Wang, Ma Yan Jun 2020

Analysis Of Static Equilibrium Workspace For Under-Constrainted Cable-Driven System With Multi-Robots, Zhigang Zhao, Li Wei, Youde Li, Yanlin Wang, Ma Yan

Journal of System Simulation

Abstract: For the under-constrainted system that multi-robots tow the payload by cables, which does not meet the condition of force closure and equations are generally not compatible, so the accurate workspace can't be found out. The static equilibrium equation of the system was established, and then the least squares principle combined with the Monte-Carlo method was put forward. When the movement is low speed or quasi static for the payload, the approximate static equilibrium workspace can be found out quickly and the expression of the cable tension is given by using the normal equations and QR decomposition respectively. When position …

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Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You Jun 2020

Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You

Journal of System Simulation

Abstract: A modeling approach for predictive maintenance (PdM) scheduling model based on decision variable conversion was proposed. Based on the proposed approach, a PdM scheduling model could be established by replacing the time decision variable in the corresponding classical time-based preventive maintenance (PM) scheduling model with product condition variable(s) and checking the correlation of the model parameters, maintenance effect and maintenance constraints with product condition. Based on the proposed modeling approach, the application case study considered an unreported predictive maintenance model in which system benefit was correlated with its condition. The proposed approach used the existing PM scheduling …

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Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking, Fangzhou Zhang, Ruixue Sun, Wenjing Zhang, Li Long, Li Qiang Jun 2020

Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking, Fangzhou Zhang, Ruixue Sun, Wenjing Zhang, Li Long, Li Qiang

Journal of System Simulation

Abstract: Well control training was explained mainly by teacher in recent years. Virtual simulation made it difficult for students to understand the actual operation. Application of drilling well control simulation training system solved effectively the problem of the scene seldom repetition and high cost of well control training. For the simulation of the process of ram blowout preventer shut-in locking in the well controlled physical simulation training system, the stepping motor driver and the stepping motor were installed in ram blowout preventer, and locking operation of the lock device was realized by using speed and torque of the stepping motor …

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Research On Network-On-Chip Synthesis Flow Based On Hybrid Optimization Mapping Algorithm, Junyi Li, Yijun Liu, Le Jianliang Jun 2020

Research On Network-On-Chip Synthesis Flow Based On Hybrid Optimization Mapping Algorithm, Junyi Li, Yijun Liu, Le Jianliang

Journal of System Simulation

Abstract: To solve the problem of particle swarm optimization algorithm, which is easy to fall into local optimum in network on chip mapping, a hybrid optimization mapping Algorithm based on particle swarm optimization and genetic algorithm was proposed. It implemented GA and PSO separately with two groups, by the superior individuals from GA algorithm instead of the initial random particles from PSO algorithm, which not only maintained the diversity of the group but also improved search efficiency. Simulation results based on NS-2 show that the Network-on-Chip from the automatic generation tools have a good performance in network latency, throughput, and …

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Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang Jun 2020

Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang

Journal of System Simulation

Abstract: Influenced by a variety of complicated factors, the network security situation has many characteristics, such as highly nonlinear, time-varying, and mutant. It is difficult to predict accurately with a single prediction method. In response to this shortage, a new combined prediction model for network security situation was proposed based on cooperation policy theory. The network security situation was predicted respectively by using the Elman neural network model, GM(1,1)model, support vector machine (SVM) mode. The Shapley value method of cooperative games was applied to determine the weight of each single prediction model, and the prediction results were weighted calculated to …

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Coordinated Control Of Power System Based On Direct Neural Dynamic Programming Method, Yu Miao, Weipeng Shang, Lu Ning Jun 2020

Coordinated Control Of Power System Based On Direct Neural Dynamic Programming Method, Yu Miao, Weipeng Shang, Lu Ning

Journal of System Simulation

Abstract: Inter-area low frequency oscillation with weak damping is a key issue affecting the security and stability operation of power grid. Currently, the implementation of wide-area DC and generator control has become one of the important means to improve inter-area low frequency oscillation damping. But the coordination among the controllers of generator, HVDC and FACTS needs to further studying. The application structure of direct neural dynamic programming method in power system stability control was proposed, and based on phase-shift neural network of general lead-lag link, the proposed method was embedded in the traditional power system stability controller. It was applied …

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Co-Design Between New Event-Triggered Communication Scheme And Less Conservative Robust H∞ Fault-Tolerant Control For Networked Control Systems, Li Wei, Pengfei Zhai, Yajie Li Jun 2020

Co-Design Between New Event-Triggered Communication Scheme And Less Conservative Robust H∞ Fault-Tolerant Control For Networked Control Systems, Li Wei, Pengfei Zhai, Yajie Li

Journal of System Simulation

Abstract: Based on the analysis for the disadvantage of the current discrete event-triggered communication schemes, a new kind of event-triggered communication scheme constrained by transient and stead-state process was proposed to perfect the conservatism and isolation of the fault-tolerant controller. A closed-loop failure model which was concerned with state-error was established for networked control system. Using the improved Wirtinger's inequality and the improved reciprocally convex combination inequality, the co-design between new event-triggered communication scheme and less conservative robust H∞ fault-tolerant control for networked control systems was focused on. The simulation results show that the new discrete event-triggered …

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Modeling And Simulation Of Hvdc Systems By Three-Phase Dynamic Phasor, Yunhao Zhao, Chongru Liu, Gengyin Li, Feilong Yun Jun 2020

Modeling And Simulation Of Hvdc Systems By Three-Phase Dynamic Phasor, Yunhao Zhao, Chongru Liu, Gengyin Li, Feilong Yun

Journal of System Simulation

Abstract: A three-phase dynamic phasor (TPDP) model of High Voltage Direct Current (HVDC) systems was proposed. The proposed model could rapidly solve the dynamic characteristics of HVDC systems for AC system symmetrical and asymmetrical operating conditions. Switch functions model of converter was enhanced according to commutation process analysis of the converter. Due to the frequency characteristics analysis results, the TPDP model of HVDC systems with the converter, DC line and controller were established through dynamic phasor theory. Simulation results show that the proposed model is effective and acceptable..

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Forestry Fire Spatial Diffusion Model Based On Integration Of Multi-Agent Algorithm With Cellular Automata, Zhao Di, Zhisheng Xu Jun 2020

Forestry Fire Spatial Diffusion Model Based On Integration Of Multi-Agent Algorithm With Cellular Automata, Zhao Di, Zhisheng Xu

Journal of System Simulation

Abstract: In view of the existing ultrasonic detection signal attenuation, directional difference, complex propagation paths, and characteristics of the components of complex, a kind of intelligent concrete defect nondestructive detection algorithm based on multi resolution singular entropy was put forward. By using the wavelet algorithm, the ultrasonic signal was decomposed into high, low frequency components of multi scales for each component, then each component was decomposed by singular spectrum analysis, at the same time using the information entropy theory, the calculation of singular entropy as the characteristic defect detection value, using the GA-SVM algorithm was used to train the singular …

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