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Articles 3331 - 3360 of 3895
Full-Text Articles in Systems Science
Simulated Analysis Of Temporal Robustness For Composite Service, Hengzhou Ye, Taoshen Li, Yunhui Guan
Simulated Analysis Of Temporal Robustness For Composite Service, Hengzhou Ye, Taoshen Li, Yunhui Guan
Journal of System Simulation
Abstract: The execution time of a service may fluctuate due to the variety of network, CPU, disk I/O and workloads, which will affect the makespan of the composite service. It is crucial to study the probability distribution and influencing factors of the real makespan to guarantee the performance of the composite service. This paper adopts directed acyclic graph (DAG) to describe the composite service. Also, with the goal of evaluating the variety degree of the makespan, we propose a temporal robustness metric for composition services. Through the rigorous analysis, we can find the boundary of this metric. By the analysis …
Permanent Magnet Synchronous Motor Fuzzy Forgetting Factor Recursive Least Squares Parameter Identification, Yanxia Shen, Baolong Jin
Permanent Magnet Synchronous Motor Fuzzy Forgetting Factor Recursive Least Squares Parameter Identification, Yanxia Shen, Baolong Jin
Journal of System Simulation
Abstract: In order to improve the stability and convergence rate of permanent magnet synchronous motor (PMSM) on-line identification, this paper proposes a fuzzy forgetting factor least squares algorithm based on the least squares algorithm with forgetting factor. The linear regression model of permanent magnet synchronous motor is established by using the linearization technique of Pade approximation method. A fuzzy controller is designed by using the current error and the forgetting factor can be adjusted adaptively. The proposed method is applied to the field of on-line identification of permanent magnet synchronous motor stator resistance, which solves the contradiction between the result …
Simulation Study On Vibration Absorption Efficiency Of Parallel Nonlinear Energy Sinks, Jian’En Chen, He Wei, Weimin Ge, Liu Jun, Zhong Rui
Simulation Study On Vibration Absorption Efficiency Of Parallel Nonlinear Energy Sinks, Jian’En Chen, He Wei, Weimin Ge, Liu Jun, Zhong Rui
Journal of System Simulation
Abstract: Parallel nonlinear energy sinks are used to suppress the vibration of the primary structure. The vibration absorption efficiencies of the single and parallel NESs are comparatively investigated. The dynamic equation under harmonic excitation is derived and the dynamic responses are analyzed by using numerical method. Through studying the influences of the installation locations and parameters of the single and parallel NESs respectively, it is found that, under normal temperature, the vibration absorption efficiency of the parallel NESs is better than that of the single NES which having the equal mass with the former absorber. Considering that the resonance frequency …
Detection Method Of Weak Signal With Multi-Stable Stochastic Resonance Under Color Noise, Zhang Gang, Yi Tian, Li’Na He
Detection Method Of Weak Signal With Multi-Stable Stochastic Resonance Under Color Noise, Zhang Gang, Yi Tian, Li’Na He
Journal of System Simulation
Abstract: The color noise is combined with a multi-stable stochastic resonance system. The characteristics of stochastic resonance in multi-stable system are analyzed deeply under color noise which is more close to reality, and the signal-to-noise ratio gain is regarded as the measurement index. The self-adaptive method is used to study multi-stable stochastic resonance system parameters a, b, c and intensity amplification facto D on the resonant output. Based on the above analysis, different signals are detected. Multi-stable system is applied in rolling bearing fault diagnosis. Experimental results demonstrate that the parameters induced multi-stable system has significant detection effect on weak …
Auxiliary Docking Maneuver Control Simulation Of Dual-Arm Space Manipulator After Capturing Operation, Cheng Jing, Chen Li
Auxiliary Docking Maneuver Control Simulation Of Dual-Arm Space Manipulator After Capturing Operation, Cheng Jing, Chen Li
Journal of System Simulation
Abstract: The auxiliary docking maneuver coordination control problems for dual-arm space robot capturing a target are discussed. The dynamic model of closed chain composite system is established based on theorem of impulse and closed-loop constraints, the impact effect of composite system after capturing operation is analyzed at the same time. The robust coordinated control method based on extended state observer (ESO) is designed for the composite system with uncertain parameters. The extended state observer is used to estimate and compensate the unknown dynamics; the precision of docking maneuver is guaranteed by composition and state feedback control. The stability of system …
A Composite Islanding Detection Method Based On Ndz Pre-Estimation Mechanism, Long Xin, Ziwei Zhu, Xu Min
A Composite Islanding Detection Method Based On Ndz Pre-Estimation Mechanism, Long Xin, Ziwei Zhu, Xu Min
Journal of System Simulation
Abstract: Islanding detection methods are divided into passive and active types. The former has a large detection blind area and low success rate. The latter has high accuracy and reliability, but it reduces the power quality of the grid by continuously adding disturbances. Thus, this paper proposes a compound islanding detection method based on NDZ pre-estimation. Several electrical parameters of the load flow on the grid side and the flow load on the inverter side are separately calculated and pre-evaluated, and Sandia frequency offset method is selectively introduced according to the evaluation result to complete the islanding detection. The …
A Novel Dual Random Pwm Scheme And Its Simulation Analysis, Haopeng Wu, Tinglong Pan, Dinghui Wu, Zhicheng Ji
A Novel Dual Random Pwm Scheme And Its Simulation Analysis, Haopeng Wu, Tinglong Pan, Dinghui Wu, Zhicheng Ji
Journal of System Simulation
Abstract: In the consideration that random pulse position pulse width modulation (PWM) still contains discrete spectral components, a novel strategy of dual randomized modulation is presented. The proposed method is based on dual zero vector random pulse position PWM, in which zero vector is selected as V(1 1 1) when M≥0.7 and as V(0 0 0) when M<0.7, and the random variation of the pulse position and the switch frequencyis realized by increasing the switch frequency randomization. To insure better random variation degree of dual random PWM,WELL algorithm is introduced to generate random number. Simulation results show that the proposed scheme can …
Dropouts Processing In Ads-B Real-Time Monitoring Based On Hybrid Filtering, Xiaoyun Shen, Jinxing Shen, Siyuan Zhang, Weidong Jiao
Dropouts Processing In Ads-B Real-Time Monitoring Based On Hybrid Filtering, Xiaoyun Shen, Jinxing Shen, Siyuan Zhang, Weidong Jiao
Journal of System Simulation
Abstract: Due to the bad real-time performance of variable dimension Kalman filter in dealing with the leakage of ADS-B real-time monitoring, a position/speed hybrid filter method is proposed. The variable dimension Kalman filter is improved based on the characteristic that the position message and the velocity message of ADS-B message are sent at different time. Two measurement equations for position and speed are designed, and different measurement equation is selected according to message category. The speed/position and navigation accuracy category in message is utilized to estimate the position/speed of present moment, so as to effectively solve the problem of data …
Optimal Closed-Loop Guidance For Cruise Missiles Based On Pseudospectral Method, Liao Ying, Haiyu Ji, Gaoxiong Xue
Optimal Closed-Loop Guidance For Cruise Missiles Based On Pseudospectral Method, Liao Ying, Haiyu Ji, Gaoxiong Xue
Journal of System Simulation
Abstract: Cruise missiles facing complex constraints are prone to deviation from the intended trajectory due to disturbances and unexpected situations in flight. Based on solving the optimal control problem of trajectory optimization with pseudospectral method, the optimal closed-loop guidance is realized by continuous on-line trajectory reconstruction using the rolling time-domain strategy. The simulation experiments are also undertaken for the unexpected events and disturbances that may be encountered during flight to verify the capability and feasibility. Simulation results show that this method can meet the requirements of real-time and accuracy, and has good adaptability to different interference errors and task …
Study On Control Method Of Plane Steering Electro-Hydraulic Load Simulator, Xiaolin Liu, Jianmin Yin, Kun Yuan
Study On Control Method Of Plane Steering Electro-Hydraulic Load Simulator, Xiaolin Liu, Jianmin Yin, Kun Yuan
Journal of System Simulation
Abstract: Aiming at the problems of low stability, low loading precision and slow response of the servo hydraulic load simulator, a control method based on the combination of the optimal quadratic theory and the improved feedforward compensation is proposed. This method is based on the optimal quadratic theory to design the optimal control algorithm to optimize the structural characteristics. The hydraulic cylinder piston displacement signals are used as the input of feedforward compensation control to design improved feedforward compensation controller. The simulation results show that this control method can not only improve the dynamic performance of the aircraft rudder electro-hydraulic …
Analysis Of Reconnaissance System Modeling And Simulation In Combat Simulation, Fan Rui, Yaxin Tan, Junqing Huang
Analysis Of Reconnaissance System Modeling And Simulation In Combat Simulation, Fan Rui, Yaxin Tan, Junqing Huang
Journal of System Simulation
Abstract: Reconnaissance system is a complex system that integrates various types of reconnaissance equipment and is an important component of the combat capabilities of the current system. Therefore, the reconnaissance system is modeled and simulated in the army combat simulation. It is a key research to discuss its operational effectiveness in a certain combat background. This paper starts from the basic concept of reconnaissance, abstracts the basic flow of reconnaissance activities, analyzes the composition of the equipment in the reconnaissance system, summarizes the simulation flow of the reconnaissance system in combat simulation, and gives the modeling analysis of the reconnaissance …
A Simulation Study Of Power Battery Grouping Equalization System, Zhu Hao, Daxing Xia
A Simulation Study Of Power Battery Grouping Equalization System, Zhu Hao, Daxing Xia
Journal of System Simulation
Abstract: A grouping equalizer scheme of lithium-ion battery pack is proposed based on cuk chopper circuit and flyback transformer balanced circuits. The grouping equalizer process could be divided into two stages: balance of cell sub-group and balance between cell sub-group. Cuk chopper circuit is used in the balance of cell sub-group for transferring the energy between adjacent cells. Bidirectional flyback transformer is employed in the balance between cell sub-group. Any optional sub-group can be balanced and the balanced energy can be transferred bidirectionally. Finally, a balanced circuit model is created in Matlab/Simulink for simulation. Simulation results show that the grouping …
Oth Target Tracking Based On Transverse Earth Coordinate System In Arctic Region, Yongkan Sun, Pingping Zhang
Oth Target Tracking Based On Transverse Earth Coordinate System In Arctic Region, Yongkan Sun, Pingping Zhang
Journal of System Simulation
Abstract: Aiming at the problem of the deviation of the target information when taking the geographic north as the azimuth datum in the horizon target tracking in Arctic region (especially in the polar regions), a virtual method to re-partition the surface of the earth is proposed which can transform the geographic pole region into a virtual equatorial region. On the basis of the above, the transverse latitude and longitude grid, the transverse earth coordinate system and the transverse geographic coordinate system are constructed, The transverse geographic north is proposed as the azimuth datum, the target range is represented with the …
Air Defense Fire Distribution Based On Cloud-Genetic Algorithm, Lei Ming, Bin Xie
Air Defense Fire Distribution Based On Cloud-Genetic Algorithm, Lei Ming, Bin Xie
Journal of System Simulation
Abstract: Air defense fire distribution is a critical problem in the researches on air defense operation. This paper builds a fire distribution model with the maximization of strike as its optimization objective, and proposes a cloud model-based modified genetic algorithm based on the advantageous characteristics of cloud model in combination of genetic algorithm, which not only accelerates the rate of convergence and increases search efficiency of the original algorithm, but also preferably avoids the problems of local optimum and premature convergence. Simulation experiments have verified the feasibility of the modified algorithm.
Hydrodynamic Characteristics Study Of Expendable Probe At Multi Cross Flow And Multi Attack Angle, Zhentao Chen, Liu Feng, Xiaolei Wang, Ye Song
Hydrodynamic Characteristics Study Of Expendable Probe At Multi Cross Flow And Multi Attack Angle, Zhentao Chen, Liu Feng, Xiaolei Wang, Ye Song
Journal of System Simulation
Abstract: The cross flow and attack angle are the two main influencing factors in the process of expendable probe releasing and sinking. The numerical simulation model is developed based on the hybrid grid and $k-\varepsilon$ turbulent model, and the hydrodynamic characteristics of five cross flows and five attack angles are analyzed. The results show that the drag coefficient of the probe in the horizontal direction increases gradually, while the drag coefficient of the probe in the vertical direction increases slowly with the increase of the cross flow. The drag coefficient in the horizontal direction increases gradually with the increase of …
Optimization Of Frictionless Cylinder-Structure Based On Pso, Liu Yu, Gouxin Zhao
Optimization Of Frictionless Cylinder-Structure Based On Pso, Liu Yu, Gouxin Zhao
Journal of System Simulation
Abstract: Aerostatic frictionless cylinder is the critical component of pneumatic gravity compensation device, the key of its design is to take all related factors into consideration for optimum performance. To optimize the structure of aerostatic frictionless cylinder, the optimal parameters in the cylinder are proposed, which maximizes the bearing capacity in radial direction and keeps the leakage at a relatively low level. Through analyzing the structure of the aerostatic frictionless cylinder, a mathematic model of the aerostatic frictionless cylinder is deduced. Based on simulations, the relationship during the structural parameters, the bearing capacity and the leakage is acquired. It is …
Design Of Imu/Gps-Based Seamless Location System For Android, Sun Wei, Wang Ye, Ruibao Li, Yang Dan
Design Of Imu/Gps-Based Seamless Location System For Android, Sun Wei, Wang Ye, Ruibao Li, Yang Dan
Journal of System Simulation
Abstract: The method of seamless combination of IMU and GPS module based on Android mobile terminal is researched and implemented, and the design scheme and experimental results are given. When the GPS signal is missing, the gait detection, heading calculation and track estimation can be carried out by using the IMU inertial sensor which is inherent in the mobile terminal to complete the seamless positioning. Based on the Android system and the open platform of Baidu map, the algorithm implementation and human-computer interaction can be completed in the mobile terminal. The test results show that the relative error of the …
Event-Triggered Scheme And Co-Design Of $H_{\Infty}$ Control In Networked Control System, Jingqi Fu, Wu Jie, Weili Shen
Event-Triggered Scheme And Co-Design Of $H_{\Infty}$ Control In Networked Control System, Jingqi Fu, Wu Jie, Weili Shen
Journal of System Simulation
Abstract: Since the wireless network time-varying delay and communication channel bandwidth have great effects on networked control systems(NCSs), this paper studies an event-triggered scheme and a $H_{\infty}$control co-design method. Initially, a delay mathematic model of NCSs is constructed. In consideration of wireless network time-varying delay between event generator and zero order holder, this paper designs an improved event-triggered communication scheme. Furthermore, by applying a new Lyapunov-Krasovskii functional and linear matrix inequality method, a criterion for the delay-independent $H_{\infty}$ stabilization is derived, and the co-design method for gaining the trigger parameters and state feedback $H_{\infty}$ control is …
An Improved Algorithm Of Vire Based On Bp Neural Network, Hongshan Kong, Bin Yu
An Improved Algorithm Of Vire Based On Bp Neural Network, Hongshan Kong, Bin Yu
Journal of System Simulation
Abstract: Aimed at the problem that the proper threshold affects the accuracy of positioning in VIRE algorithm, a RFID positioning method combining BP neural networks with VIRE algorithm is presented and is named BP-VIRE. BP-VIRE utilizes the same reader’s configuration and deployment as that of VIRE, and regards referenced tag RSSI and coordinate values as training samples, and constructs the positioning model based on neural networks with the help of BP algorithm which uses the method of error back propagation. According to the simulation results, compared with VIRE, BP-VIRE performance is better in the capability of positioning, esp. in the …
Simulation Of Automated Terminal With Dual-Rail Transport Trolley And Hollow Track Layout, Pengfei Zhou, Xiaowei Xing
Simulation Of Automated Terminal With Dual-Rail Transport Trolley And Hollow Track Layout, Pengfei Zhou, Xiaowei Xing
Journal of System Simulation
Abstract: Container terminals with dual-rail transport trolley and hollow track layout (CTTH) are novel concept, for which a simulation model is developed with stochastic Petri nets. The simulation realization is discussed using Plant Simulation platform. A CTTH simulation system is developed to analyze its operational efficiency and parameter effects. Experiments show that CTTHs are more efficient than container terminals with automated RMGs. The study findings are helpful reference for the simulation models of automated container terminal and CTTH developments.
Finite Element Numerical Simulation Of Pre-Damaged Reinforced Concrete Beam, Jiaquan Wu, Hongyan Li, Ye Fei, Xinyu Zhang, Kun Ma
Finite Element Numerical Simulation Of Pre-Damaged Reinforced Concrete Beam, Jiaquan Wu, Hongyan Li, Ye Fei, Xinyu Zhang, Kun Ma
Journal of System Simulation
Abstract: Based on the theory of model analysis, the general variation of model parameters, such as the structure natural frequency, displacement mode, curvature mode and strain mode etc.model of reinforced concrete beams with different damage locations and different damage states are reversely studied by finite element numerical simulation with the pre-damaged reinforced concrete beam structure as the research object, model and the aptability, sensitivity in the reinforced concrete structure damage identification are discussed. The results show that the frequency and displacement mode can not effectively reflect the existence of structural damage, but curvature mode and strain mode can reflect the …
Modeling And Simulation Of Initial Loading Balls And Replenishing Balls Of The Duplex Inlet & Outlet Coal Mill, Junjie Gu, Yukun Wang, Zhizhong Bai
Modeling And Simulation Of Initial Loading Balls And Replenishing Balls Of The Duplex Inlet & Outlet Coal Mill, Junjie Gu, Yukun Wang, Zhizhong Bai
Journal of System Simulation
Abstract: To solve the problems of excess of abrasion of steel balls and high power consumption used for grinding of the duplex inlet & outlet coal mill, a method that can calculate the initial balls loading, the period and quantity of adding balls for the mill is presented on the basis of building up the models of steal balls’ abrasion and motion. Setting #E coal mill as example, period and quantity of adding balls are confirmed accurately in consideration of variation of power, the maximum capacity and fineness of coal powder, compensatory quantity of each grade of balls are also …
Blind Equalization Algorithm Of Variable Segment Error Function Based On Catfish Effect Particle Swarm Optimization, Yecai Guo, Jiping Wu
Blind Equalization Algorithm Of Variable Segment Error Function Based On Catfish Effect Particle Swarm Optimization, Yecai Guo, Jiping Wu
Journal of System Simulation
Abstract: In order to overcome the disadvantage of the slow convergence rate and big steady state error of constant modulus algorithm (CMA), a variable segment error constant modulus blind equalization algorithm based on the catfish effect particle swarm optimization algorithm (CEPSO-VSCMA) is proposed. The algorithm introduces catfish effect particle swarm optimization on the base of VSCMA, finding the globally optimal solution with the global searching of particle swarm. Meanwhile, vibrant and competitive catfish individual are employed to reactivate particle swarm and accelerate convergence. The simulation results show that the proposed algorithm performs better in improving convergence rate, decreasing inter-symbol …
Modeling And Simulation On Entities’ Belief In Cyberspace, Jiuyang Tao, Wu Lin, Xiaoyuan He, Rong Ming
Modeling And Simulation On Entities’ Belief In Cyberspace, Jiuyang Tao, Wu Lin, Xiaoyuan He, Rong Ming
Journal of System Simulation
Abstract: Of all cyber-attacks, 'fabrication' which is aimed at impacting one’s awareness is becoming the common means, so it is of great importance to explore ways so as to defend such attacks. An attack can success or not always rely on the entities’ belief of certain events. In this paper, two different ways of 'fabrication' attack are put forward, and three essential conditions for 'fabrication' attack are analyzed. Second, a cyberspace belief model in terms of the Dempster-Shafer framework based on situation awareness theory is built to study the evolution of the cyber entities’ belief under the 'fabrication' attack. In …
Design Of Remote Medical Care Service Robot System, Yulin Xu, Chen Ling, Li Xin, Aolei Yang, Yanran Long, Chunli Zhu, Yanbo Liu, Yuzhang Jin
Design Of Remote Medical Care Service Robot System, Yulin Xu, Chen Ling, Li Xin, Aolei Yang, Yanran Long, Chunli Zhu, Yanbo Liu, Yuzhang Jin
Journal of System Simulation
Abstract: This paper introduces a service robot system for remote medical inspection. The robot is developed with the following functions: it is able to navigate in working area autonomously and be controlled remotely by doctors through a handheld terminal device; it is able to follow a fixed target such as nurses and doctors to reach any area; it has a touch-control interactive interface which can realize remote audio and video interaction between doctors and patients; it is embedded with portable type-B ultrasonic device, sphygmomanometer and thermometer for doctors to obtain physiological data of patients. With the above-mentioned functions, the robot …
Intelligent Diagnosis Of Aircraft Electrical Faults Based On Rmbp Neural Network, Lishan Jia, Zhe Liu, Sun Yi
Intelligent Diagnosis Of Aircraft Electrical Faults Based On Rmbp Neural Network, Lishan Jia, Zhe Liu, Sun Yi
Journal of System Simulation
Abstract: To the characteristics of multiple properties, hard to remove and high cost of time and manpower of aircraft electrical faults maintenance in aircraft maintenance of civil aviation, construction of intelligent aircraft electrical faults diagnosis system using RMBP neural network is proposed. RMBP algorithm is used to study sample data in the intelligent faults diagnosis system as it can overcome the faults of long time of convergence and easy to go into local minima of common BP algorithm, and is suitable for training large-scale neural network,. Experience data are collected, samples are made, samples training and experiment are carried out. …
Complex Network Modeling And Visualization Analysis For Ocean Observation Data, Sun Xin, Zhenhua Li, Junyu Dong, Xinyan Luo, Yuting Yang
Complex Network Modeling And Visualization Analysis For Ocean Observation Data, Sun Xin, Zhenhua Li, Junyu Dong, Xinyan Luo, Yuting Yang
Journal of System Simulation
Abstract: Ocean data analysis is one of the important foundations in marine science research. Analysis on the sea surface temperature based on complex network theory helps explore the marine dynamics in a new perspective. The ocean is divided into grids, and the annual average of the sea surface temperature is calculated to reflect the properties of the corresponding grid area. The mutual information and the Pearson correlation coefficient are used to measure the similarity between different areas. The nonlinear and linear complex network models which reflect the station of the global marine climate can be built. Finally some popular measures …
Variable Scale Point Cloud Registration Algorithm, Shuifa Sun, Zhun Li, Kun Xia, Yunfei Shi, Jiquan Yang, Fangmin Dong
Variable Scale Point Cloud Registration Algorithm, Shuifa Sun, Zhun Li, Kun Xia, Yunfei Shi, Jiquan Yang, Fangmin Dong
Journal of System Simulation
Abstract: To address the low registration accuracy issue caused by scale mismatch of two point clouds, a multi-scale point cloud registration algorithm is proposed based on the distance ratio invariance of the geometric center of gravity and centroid. The point cloud is firstly filtered. Then, the scale ratio calculation model of the point cloud data is established by computing the point cloud’s gravity center and centroid. Finally, according to the relationship between the registration error and the scale true value, the scale factor is refined step by step with ICP algorithm. For the noise and the inconsistent point in the …
Virtual-Reality Video Fusion System Based On Video Model, Zhou Yi, Meng Ming, Wu Wei, Zhou Zhong
Virtual-Reality Video Fusion System Based On Video Model, Zhou Yi, Meng Ming, Wu Wei, Zhou Zhong
Journal of System Simulation
Abstract: The aim of virtual reality integration is to reduce the visual difference of virtual object and real video image. However, it still has several problems, including heavy imagery distortion when the user deviates from the source viewport, and huge modeling cost of virtual scene. For these issues, this paper proposes a novel virtual-reality video fusion system based on video model. We firstly introduce how we register and build video model with interactive operations, then present the fusion method of video and virtual scenes. On the design and implementation stage, we introduce the architecture of our system. Finally, we …
Optimization Of Material Release For Printed Circuit Board Template Based On Data Mining, Shengping Lü, Qiangsheng Yue, Liu Tao
Optimization Of Material Release For Printed Circuit Board Template Based On Data Mining, Shengping Lü, Qiangsheng Yue, Liu Tao
Journal of System Simulation
Abstract: Data mining were employed for the optimization of material release of PCB (Printed Circuit Board) template. PCB scrap ratio related parameters were specified and prediction model variables were chosen according to hypothesis test. Multiple linear regression (MLR), Chi-squared automatic interaction detector, artificial neural network and support vector machine approaches for the prediction of scrap ratio were employed. Evaluation indictors called as superfluous ratio, supplement release ratio and weighted sum of the two were presented; the material release simulation was conducted and then the four approaches were compared and MLR was taken as the preferred one. Adjust coefficient …