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Articles 241 - 270 of 1494
Full-Text Articles in Systems Science
Research On Model Predictive Control With Dual Feedback Based On State Extension, Zho Xilin, Lijuan Yin
Research On Model Predictive Control With Dual Feedback Based On State Extension, Zho Xilin, Lijuan Yin
Journal of System Simulation
Abstract: Depending on the online implementation demand of Model Predictive Control (MPC) for the receding horizon control characteristic, a control strategy of dual feedback structure based on state extension was proposed. The control strategy was aimed to improve the online computational capability about the control system to achieve the control target without any change of the system information. Based on the analysis of the characteristic of MPC, the extension and conversion method of state variable was proposed according to the relationship between state variable, control variable, output variable and system model. And the structure of the control system after state …
Prediction And Estimation Of 95% Distillation Point Diesel In Delayed Coking Unit Based On Kernel Partial Least Squares, Cheng Jian, Lingbo Zhang, Xingsheng Gu
Prediction And Estimation Of 95% Distillation Point Diesel In Delayed Coking Unit Based On Kernel Partial Least Squares, Cheng Jian, Lingbo Zhang, Xingsheng Gu
Journal of System Simulation
Abstract: In order to save labor cost and time of 95% distillation point of diesel analysis, and improve the efficiency of adjusting the device, an algorithm was proposed to predict 95% distillation point of diesel based on Kernel Partial Least Squares(KPLS), on the basis of studying the process of delayed coking unit and analyzing the main factors related to 95% distillation point of diesel. The experiment results show that this algorithm can deal with the non-linear relationship among the variables effectively and quickly. Furthermore, the results also show that the model based on KPLS is better than that based on …
Research On Electronic-Protection Circuit Of Chopper Cascade Speed System Based On Matlab, Yongguang Ma, Zhaoyan Zhang, Xingwu Wang, Bingshu Wang, Yaming Yuan
Research On Electronic-Protection Circuit Of Chopper Cascade Speed System Based On Matlab, Yongguang Ma, Zhaoyan Zhang, Xingwu Wang, Bingshu Wang, Yaming Yuan
Journal of System Simulation
Abstract: According to the topology of conventional chopper cascade speed system, the transient process of main loop during of contactor operation was analyzed when device failed. Because the contactor action required a longer time, equipment was vulnerable to the impact of high voltage, high current during the contactor action, which caused damage to power electronic devices. For contactors' drawbacks, the main circuit topology with electronic protection circuit was designed. Then transient process of conventional chopper cascade speed system and chopper cascade speed system with electronic protection circuit under high voltage power failure conditions was analyzed, and theoretics was detailedly deduced. …
Infrared Radiation Modeling Of Planets Based On Vsop87 Theory, Guo Feng, Xiaojian Xu
Infrared Radiation Modeling Of Planets Based On Vsop87 Theory, Guo Feng, Xiaojian Xu
Journal of System Simulation
Abstract: Based on the Variations Seculaires des Orbites Planetaires (VSOP) 87 theory, an approach for generating infrared radiant scene of planetary background was presented. With the VSOP87 theory, the heliocentric coordinates of eight planets in the solar system were worked out at given time. The coordinates were revised by time correction so that real coordinates were achieved. The corrected heliocentric ecliptic coordinates of planets were converted into geocentric horizontal coordinates according to the position of the observer. After that, the projected coordinates and projected radiuses of planets were achieved from projection transformation based on the field of view (FOV) and …
Two-Level Systematic Calibration Method Of Fog Strap-Down Inertial Navigation System, Guiling Zhao, Qihang Yang, Li Song
Two-Level Systematic Calibration Method Of Fog Strap-Down Inertial Navigation System, Guiling Zhao, Qihang Yang, Li Song
Journal of System Simulation
Abstract: According to the characteristics of traditional systematic calibration method that of high state variable dimension, poor observability and easy filtering divergence, a two-level systematic calibration method was proposed. By merging the accelerometer calibration errors and FOG calibration errors, the dimension of Kalman filter was reduced. The systematic calibration method took speed error and attitude error as observation vector and designed six positions to estimate the state vector, then decoupled the estimation and calculated the calibration errors. For the characteristics that the estimated time of FOG calibration error was long and the beginning of Kalman filter convergenced rapid, it estimated …
Simulation Study Of Soft Switching Technology For Quasi-Z-Source Boost Converter, Kun Xia, Yanneng Zeng, Ge Yue, Xiaodi Li
Simulation Study Of Soft Switching Technology For Quasi-Z-Source Boost Converter, Kun Xia, Yanneng Zeng, Ge Yue, Xiaodi Li
Journal of System Simulation
Abstract: With the same input voltage and duty cycle, quasi-Z-source boost converter can provide higher output voltage than traditional boost converter. It has the advantages of high efficiency, wide range of practical output voltage. A quasi-Z-source boost converter topology with soft switching technology was proposed. Using assist switch replaced the diode of original topology, which could accomplish the zero voltage switching on state of the main switch. The MATLAB/Simulink simulation results show that the new topology can reduce the switch stress of main switch and increase the system stability, also it can prolong the life time of switching devices.
Research Progress On Virtual Pruning Fruit Trees, Mengmeng Lü, Shenglian Lu, Xinyu Guo
Research Progress On Virtual Pruning Fruit Trees, Mengmeng Lü, Shenglian Lu, Xinyu Guo
Journal of System Simulation
Abstract: The tree structure has a strong influence on fruit yield and quality, and pruning is one of the most important management measures of tree shapes with high yield and good quality. Pruning test or technology demonstration in real fruit trees are irreversible defects, high cost, and difficult to fast rendering of pruning. Virtual pruning of fruit trees, which is in this context with rapid progress of virtual reality technology has developed rapidly and becomes the hot research topic. The aim is to create a space of virtual and simulate fruit tree pruning and the influence of pruning, so as …
Gait Planning And Control Of Quadruped Robot With High Payload, Hu Nan, Shaoyuan Li, Huang Dan, Gao Feng
Gait Planning And Control Of Quadruped Robot With High Payload, Hu Nan, Shaoyuan Li, Huang Dan, Gao Feng
Journal of System Simulation
Abstract: A position controller for a quadruped robot with high payload was proposed. The robot was developed by the lab, and the high payload capacity was realized by the specific design of its actuation system, integrating novel high precision actuators, and by its legs, composed by a new family of parallel mechanisms. The foot trajectory was scheduled based on the Bezier curve in order to improve the stability of quadruped robot. The performance and efficiency of the proposed methods were verified by simulation and experiments.
Light Illumination Simulation Approach For Remote Sensing Image Based On Geometric Mapping, Chenhao Wang
Light Illumination Simulation Approach For Remote Sensing Image Based On Geometric Mapping, Chenhao Wang
Journal of System Simulation
Abstract: Light Illumination is one of the most important parts of imaging simulation research. A new light illumination simulation approach for remote sensing image based on geometry mapping was proposed. The first step was the geometric calibration of the input image, and the visible light reflection property was extracted by the inverse rendering approach; Second, geometric information of each pixel in the input image was obtained by geometric mapping; and the simulation output of new light illumination condition could be got with the imaging calculation in the image space. Results show that the new approach can achieve simulation image of …
Traction Calculation Analysis And Simulation Of Urban Rail Train On Multi-Particle Model, Jianjun Meng, Xiaoqiang Chen, Ruxun Xu, Yanlong Zhang, Tengzhou Wei, Xiaoqi Jiang
Traction Calculation Analysis And Simulation Of Urban Rail Train On Multi-Particle Model, Jianjun Meng, Xiaoqiang Chen, Ruxun Xu, Yanlong Zhang, Tengzhou Wei, Xiaoqi Jiang
Journal of System Simulation
Abstract: In order to optimize the traction operation of urban rail train, and make the train operation more accurately and closely to the reality, train multi-particle model was established on the basis of train kinematic equations and hybrid optimization traction strategy. Linear interpolation was adopted in the process of traction and braking force analysis, and the selection of braking point was obtained by reverser trial method. Then, according to the set parameters of train and line, traction operation was simulated by Matlab. Simulation results show that multi-particle model compared with single-particle model, can effectively improve precision of additional resistance on …
Flow Distribution Simulation About Slipper Pair Of Hydraulic Axial Ram Pump, Wang Hui, Yuning Song, Yejiao Song
Flow Distribution Simulation About Slipper Pair Of Hydraulic Axial Ram Pump, Wang Hui, Yuning Song, Yejiao Song
Journal of System Simulation
Abstract: Slipper pair is one of the most important frictional pairs of hydraulic axial ram pump, which is supported by static pressure to facilitate good lubricating. The fluid in the slipper pair was analyzed by using Reynolds number. The length when the flow in plunger damping hole was turbulence was shorter than that when it was laminar. To reduce the leak and prove the performance of slipper, the moisture film of sealing strip should be laminar. The flow distribution of slipper pair was analyzed by FLUENT after the model of moisture film was created. The distribution of pressure and velocity …
Study Of Cognitive Model For Survivable System Based On High-Order Multi-Type Π Calculus, Guosheng Zhao, Zhang Nan, Wang Jian
Study Of Cognitive Model For Survivable System Based On High-Order Multi-Type Π Calculus, Guosheng Zhao, Zhang Nan, Wang Jian
Journal of System Simulation
Abstract: A cognitive model for survivable system with a multilayer cognitive ability was proposed, and based on high-order multi-type π calculus, combining formal modeling of cognitive model with quantitative analysis of cognitive performance, thus can obtain the quantitative evaluation of system cognitive performance after formal modeling of system operation state, system service and internal structure. A cognitive model for survivable system with a multilayer cognitive ability was proposed. Based on high-order multi-type π calculus, formal modeling of cognitive model for survivable system in two aspects was taken. By using the tool MWB, the tests were achieved about system availability, instantaneous …
Signaling Game Analysis And Simulation On Network Decoy Defense Strategies, Leyi Shi, Junnan Zhao, Li Qin, Wen Xiao, Liu Xin
Signaling Game Analysis And Simulation On Network Decoy Defense Strategies, Leyi Shi, Junnan Zhao, Li Qin, Wen Xiao, Liu Xin
Journal of System Simulation
Abstract: The network decoy confrontation is regarded as a kind of observable behavior of a multi-stage signaling game. Four types of gaming models for decoy confrontation process were constructed step by step using signaling game theory, i.e. the normal service, the mixed system of normal service and honeypot, the mixed system with two kinds of signaling, and the mixed system with two kinds of signaling and three actions. In these signaling game models, the server sent a normal signaling or honeypot signaling as the sender, while the attacker chose to access, give up or access in condition as the …
New Energy-Saving Control Of Induction Motor Considering Core Loss, Bulai Wang, Wei Biao, Zhang Fan, Zhenzhen Huang, Yunfei Zhang
New Energy-Saving Control Of Induction Motor Considering Core Loss, Bulai Wang, Wei Biao, Zhang Fan, Zhenzhen Huang, Yunfei Zhang
Journal of System Simulation
Abstract: In order to further improve the running efficiency of induction motor, a new energy-saving control method was proposed. Considering the influence of varied flux, a control strategy coordinating the optimal flux with the optimal slip angular frequency based on the slip angular frequency control was built. The mathematical model of induction motor considering core loss was established. The expression of the optimal flux and slip angular frequency was obtained according to the Lagrange multiplier method when system was the highest efficiency. By using MATLAB simulation platform, a simulation model of the energy saving control system was built doing a …
Research On Radar Anti-Jamming Performance Evaluation Index System Based On Rough Set Theory, Zongfeng Qi, Han Shan, Jianxun Li
Research On Radar Anti-Jamming Performance Evaluation Index System Based On Rough Set Theory, Zongfeng Qi, Han Shan, Jianxun Li
Journal of System Simulation
Abstract: The applications of generalized rough set theory were researched for the construction and optimization of radar anti-jamming performance evaluation index system. A mass of real-valued data was converted to some interval-valued data to avoid the difficulty of classification. The H'- information entropy-based information filling technique was employed to solve the problem of missing evaluation data. The E-condition entropy-based heuristic algorithm was applied to make attribute reduction, optimize evaluation index system, and extract final decision rules. The feasibility, validity and practicability of proposed method were testified by a simulation example.
Facial Vital Sign Based Countermeasure Against 3d Mask Attacks, Xiaojing Gu, Chuanqing Fu, Xingsheng Gu
Facial Vital Sign Based Countermeasure Against 3d Mask Attacks, Xiaojing Gu, Chuanqing Fu, Xingsheng Gu
Journal of System Simulation
Abstract: Vulnerability to spoofing attacks is the main drawback for current face authentication systems. Traditional spoofing attacks include displaying printed photos and replaying recorded videos. With the development of 3D printing technology, the 3D mask spoofing attack has been becoming the new threat. A novel anti-spoofing feature was proposed to 3D mask attacks. A liveness feature from the power spectrum of facial color signal was extracted based on a physiological phenomenon that the color of real human face changed periodically due to the blood circulation. The performance of countermeasure jointly using the liveness feature and facial texture feature was evaluated …
Modeling And Control Of Shaking Motion Of Aerial Refueling Hose-Drogue, Zhang Jin, Suozhong Yuan, Quanquan Gong
Modeling And Control Of Shaking Motion Of Aerial Refueling Hose-Drogue, Zhang Jin, Suozhong Yuan, Quanquan Gong
Journal of System Simulation
Abstract: Hose-Drogue fly with the tanker in the air can produce shaking motion which increases the difficulty of coupling with a refueling drogue for a receiver plane safely and accurately. A mathematical model of shaking motion of aerial refueling hose drogue under the tanker wake and atmospheric turbulence was proposed by the method of rigid multibody dynamics. Then the balance drag wake of hose-drogue and the atmospheric turbulence on hose-drogue in different flight conditions were analyzed based on this model. To reduce the movement amplitude of the hose-drogue in the air, the controller to the motion of the hose-drogue …
Cellular Automata Model Of Non-Motor Vehicle Flow Considering Reverse Vehicles, Xianyan Kuang, Weihua Cao, Wu Yun
Cellular Automata Model Of Non-Motor Vehicle Flow Considering Reverse Vehicles, Xianyan Kuang, Weihua Cao, Wu Yun
Journal of System Simulation
Abstract: The phenomenon of non-motor vehicle reverse driving in one-way non-motor vehicle road occurs in most China's cities. A cellular automata model of non-motor vehicle flow mixed with reverse driving vehicles was established, which considered the different lane-changing rules of the reverse and forward vehicle. The results of the computer numerical simulation for the model show that, in low density stage, the ratio of reverse vehicles has little effect on flow and speed, and the capacity and the avenge speed decrease as the ratio of reverse vehicles increases. Lane-changing ratio has a great influence on the mixed non-motor vehicles …
General Modeling Method Of Aircraft Constant-Altitude Flight, Xiaowen Duan, Xiaoguang Gao, Li Bo
General Modeling Method Of Aircraft Constant-Altitude Flight, Xiaowen Duan, Xiaoguang Gao, Li Bo
Journal of System Simulation
Abstract: An algorithm for the aircraft constant-altitude long-distance flight consider earth curvature studied. The required overload was calculated using the error between the real position and the ideal trajectory for two basic long-distance flight styles, i.e. great circle flight and circular flight, the simulation model of the two basic constant-altitude flight styles was established. On this basis, taking the modeling of constant-altitude box maneuvering and 8-shape constant-altitude flight as an example, the modeling process of constant-altitude combined model was studied. The simulation result shows the constant-altitude flight model can be widely used, easily implemented and easily expanded. Meanwhile, the model …
Research And Design Of All-Purpose Simulation Platform Of Fault Injection, Wenbin Yao, Zhao Ling, Wang Zhen, Yao Xiang
Research And Design Of All-Purpose Simulation Platform Of Fault Injection, Wenbin Yao, Zhao Ling, Wang Zhen, Yao Xiang
Journal of System Simulation
Abstract: Focusing on the limited injection position and single target system problems existing in the simulation research of fault injection, combined with the NS2 simulation technology and fault injection method, an all-purpose simulation platform of fault injection was proposed. The layered model of the targeted information system was constructed, whose topology information and service performance information was given by the matrix, and improved the generality of the simulation platform of fault injection. Based on the configuration information, the platform constructed the fault library, which brought the cost reduction and reliability promotion of the system faults. The quadruple design of the …
Software Technology Of Transportation Virtual Simulation Experiment Teaching Center, Shiwei He, Leishan Zhou
Software Technology Of Transportation Virtual Simulation Experiment Teaching Center, Shiwei He, Leishan Zhou
Journal of System Simulation
Abstract: The general architecture and experiments of Transportation National Virtual Simulation Experiment Teaching Center (TNVSETC) were introduced. The features of simulation platforms which include “huge, multi-sources, iomerous” big-data platform, “whole procedure, semi-object, virtual reality” railway planning, design and operation integrated simulation platform, roadway planning, design, control and operations evaluation simulation platform were analyzed. The main modeling techniques and technique characteristics of simulation software including traffic circumstance construction technology, vehicle behavior model, pedestrian behavior model, transporation supplying model and management methods were summarized. The advice on the future development of TNVSETC simulation software was proposed.
Fusion Comparing Visualization Method For Pesticide Residue Detection Data, Hongqian Chen, Li Hui, Fang Yi, Qixian Liu, Chen Yi
Fusion Comparing Visualization Method For Pesticide Residue Detection Data, Hongqian Chen, Li Hui, Fang Yi, Qixian Liu, Chen Yi
Journal of System Simulation
Abstract: To express efficiently the association and difference among cities, categories and standards in pesticide residue detection data analysis, a fusion visualization method based on data statistic and OpenGL graphics library was proposed. The method can accelerate the dataset comparing and selecting for the expert interaction and data analysis. The method firstly summarizes the detection data in pesticide residue detection database according to its various category and belonging region. All the data are shown in one fusion visualization result. The result can assist expert to compare efficiently and analysis intuitionally the dataset. The data of the selected dataset in …
Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu
Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu
Journal of System Simulation
Abstract: Typical sources of switched current mirror mismatch were discussed. The most important three parameter of mismatch: transconductance, threshold voltage and the sub threshold slope were analyzed, due to the switch current circuit adopts the width to length ratio characteristic for calibration design. SPICE model using Hspice platform and 0.18 um BSIM3_V3.1 were proposed for circuit simulation. The simulation and analysis of mismatch were executed based on two kinds of operating rules of weak inversion and strong inversion. The compensation ability for mismatch was provided by floating gate switch current mirror which was also verified by simulation. Analysis and simulation …
Modeling And Simulation Of Multi-Nozzle Ejector Based On Flowmaster, Lan Jiang, Zhu Lei, Jingquan Zhao
Modeling And Simulation Of Multi-Nozzle Ejector Based On Flowmaster, Lan Jiang, Zhu Lei, Jingquan Zhao
Journal of System Simulation
Abstract: A mathematical model of multi-nozzle ejector was established according to the mass conservation, energy conservation and momentum conservation, and a modification was achieved with the introduction of momentum correction coefficient and discharge coefficient. On this basis, linear coefficients used in the fluid network method were determined, then a system-level simulation model of multi-nozzle ejector was first developed with C# language on the fluid system simulation software of Flowmaster. The simulation and experimental results of the multi-nozzle ejector in an aircraft environmental control system shows that the entrainment ratio decreases with the increasing pressure ratio of primary and secondary flow. …
Simulation On Aircraft Infrared Exposed Range And Detection Probability, Yunfei Zhang, Mengyue Hu, Dexiong Lai, Gengjun Ma
Simulation On Aircraft Infrared Exposed Range And Detection Probability, Yunfei Zhang, Mengyue Hu, Dexiong Lai, Gengjun Ma
Journal of System Simulation
Abstract: According to the infrared-detector operating range equation, the method used to simulate the infrared detection probability and exposure of an aircraft was established, with the use of atmospheric transmission rate calculation method, the critical radiation strength calculation method and the detection probability calculation method. The physical meaning of the exposed range was analyzed, and an infrared detection simulation system was established. The system could be used to assess the infrared stealth performance of an aircraft, which includes the curve of detection probability and the curve of exposed range, giving the flight route and the infrared radiation intensity distribution of …
Adaptive Minimum Entropy Blind Equalization Algorithm Based On Quantum Artificial Fish Swarm Optimization, Yecai Guo, Wu Xing, Huang Wei, Wang Hui
Adaptive Minimum Entropy Blind Equalization Algorithm Based On Quantum Artificial Fish Swarm Optimization, Yecai Guo, Wu Xing, Huang Wei, Wang Hui
Journal of System Simulation
Abstract: In order to improve the equalization performance of high order inconstant modulus signals, adaptive minimum entropy super-exponential iteration blind equalization algorithm based on quantum artificial fish swarm optimization was proposed. The proposed algorithm could accelerate convergence rate via super-exponential iteration algorithm and could further decease the mean square error of the super-exponential iteration adaptive minimum entropy blind equalization algorithm via using the global optimization of the quantum artificial fish swarm algorithm designed by Schrodinger equation. The simulation results demonstrate that the proposed algorithm has fast convergence rate and lower mean square error for different higher modulation signals comparison with …
Short -Term Prediction Of Wind Power Based On Ide-Wnn And Probabilistic Evaluation, Zengliang Liu, Songlin Zhou, Tongxu Zhou
Short -Term Prediction Of Wind Power Based On Ide-Wnn And Probabilistic Evaluation, Zengliang Liu, Songlin Zhou, Tongxu Zhou
Journal of System Simulation
Abstract: Wind power prediction usually concludes determined and uncertainly prediction. The former puts important on prediction accuracy and the later focus on the the risk of prediction results. For increase the prediction accuracy, an improved differential evolution algorithm was applied to widely search the optimal solution of wavelet neural network in different directions. By calculating joint conditional probability of wind power predictions about prediction error and power fluctuation, the risk of prediction results could be more fully assessed. The effectiveness of the proposed method was verified by simulation experiments.
Analysis And Simulation Of A Class Of Time-Varying Wireless Networked Control Systems, Weihua Deng, Minrui Fei
Analysis And Simulation Of A Class Of Time-Varying Wireless Networked Control Systems, Weihua Deng, Minrui Fei
Journal of System Simulation
Abstract: The problem of stabilization was investigated for a class of discrete time-varying systems over a physical IEEE 802.11b wireless channel. The wireless network-induced delays were characterized by an inverse Gaussian distribution model (IGDM) and the time-varying nature was depicted by uncertain parameter model. The model-based state feedback controller was designed to compensate the influence of delays and time-varying nature. And the stochastic stabilisability of discrete time-varying networked control system was analyzed and the solution of controller was given in the form of linear matrix inequalities (LMIs). The effectiveness of the proposed methods was illustrated by numerical simulation examples.
Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning
Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning
Journal of System Simulation
Abstract: The application of virtual reality in the rehabilitation has been extensively studied, which helps patients after a stroke independently perform daily living activities, while saving time, money and other costs. This study used Microsoft Kinect virtual reality game to assess the movement of the users. The game required movement outside of the head, torso and arms. In nine games exercise, the average and maximum amount of movement remained unchanged. However, with the increase of exercise, the frequency of head movement increased. The results show that by head movement, video games can be used to balance the posture rehabilitation, …
Dynamic Arrival Sequencing & Scheduling Based On Branch & Bound Algorithm, Junfeng Zhang, Wang Fei, Tengteng Ge
Dynamic Arrival Sequencing & Scheduling Based On Branch & Bound Algorithm, Junfeng Zhang, Wang Fei, Tengteng Ge
Journal of System Simulation
Abstract: Optimization of arrival sequencing and scheduling is not only the prerequisite for properly allocating and fully utilizing the runway resource, but also the fundamental element for improving terminal operation efficiency. Dynamic arrival sequencing was obtained by time-triggered sliding time window method. On the basis of accurate 4D trajectory prediction, branch and bound algorithm was adopted to generate an optimal sequence, combined with the actual operation constraints. Taking Shanghai Pudong Airport as an example for simulation, the optimization results were compared with the actual landing time and simulation results based on first come first serve strategy. The results indicate that …