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4,171 full-text articles. Page 133 of 207.

Doppler Ultrasound Blood Flow Signal Simulation Of Aneurysm Based On Analytical Velocity Distribution, Gao Lian, Yufeng Zhang, Jine Yan, Zhiyao Li, Kexin Zhang, Xiong Min, Suya Han 2020 1. Department of Electronic Engineering, Information School, Yunnan University, Kunming 650091, China;;

Doppler Ultrasound Blood Flow Signal Simulation Of Aneurysm Based On Analytical Velocity Distribution, Gao Lian, Yufeng Zhang, Jine Yan, Zhiyao Li, Kexin Zhang, Xiong Min, Suya Han

Journal of System Simulation

Abstract: For simulating the Doppler ultrasound blood flow signals in the vessels with aneurysms at different stages of development, this paper presents a simulation model in which the Doppler ultrasound blood flow signals are obtained by employing cosine-superposed constituents which are modulated by a power spectral density (PSD) estimated from velocity profile calculated by analytically solving the Navier-Stokes equations according to the axis-centerline velocity at the upstream faraway segment of the aneurysms. In the experiments, the Doppler ultrasound blood flow signals in the normal vessels and vessels with aneurysms having different dilations are generated, respectively. The simulated Doppler ultrasound blood …


Sub-Zero Cold Start Simulation Of Hybrid Fuel Cell Vehicle Drivetrain, Xinfeng Zhang, Minghui Luo, Chuanqi Yao, Dai Wei, Guofeng Chang 2020 Clean energy Automotive Engineering Center, Tongji University, Shanghai 201804, China;

Sub-Zero Cold Start Simulation Of Hybrid Fuel Cell Vehicle Drivetrain, Xinfeng Zhang, Minghui Luo, Chuanqi Yao, Dai Wei, Guofeng Chang

Journal of System Simulation

Abstract: Sub-zero cold start is a major obstacle for PEM fuel cell vehicle's commercialization. This paper aims to study the sub-zero cold starting process of hybrid fuel cell vehicle. A thermo-electro-mechanical coupling model was built based on the electro-chemical and thermal dynamic performance of battery and fuel cell, as well as the mechanical dynamic performance of fuel cell's auxiliary system. A computational model was also set up based on MATLAB/simulink. Through simulations under different heat powers, the energy consumption and battery state of charge are analyzed, which help to optimize power train's configuration and control strategy.


Chemical Reaction Optimization Algorithmfor Solving Quaycrane Scheduling Problems Of Container Terminal, Wang Xu, Shixin Liu, Ruiyou Zhang, Wang Jia 2020 1. SchoolofEconomics, Hebei University of Environmental Engineering, Qinhuangdao 066102, China;;2. College of Information Science & Engineering,Northeastern University, State Key Laboratory of Synthetical Automation for Process Industries, Shenyang 110819, China;;

Chemical Reaction Optimization Algorithmfor Solving Quaycrane Scheduling Problems Of Container Terminal, Wang Xu, Shixin Liu, Ruiyou Zhang, Wang Jia

Journal of System Simulation

Abstract: This paper researches on quay crane scheduling for unloading operations in container terminal. Considering quay crane work within its time window, an unloading scheduling simulation model is established.According to the characteristics of the unloading scheduling simulation model,a DoubleList Molecular Structure-based Chemical Reaction Optimization(DLMCRO) algorithm is developed. There are two parts in coding: one is the priority relation of the task, and the other is the task-to-quay-node mapping.Discrete Event Dynamic Simulation(DEDS)is used to simulate the decoding process. Four elementary chemical reaction operations against the problem are designed. The simulation experiment is …


Application Of Virtual Reality In Plc Gas-Fired Boiler Training System, Dahu Wang, Chen Xia, Huizheng Gao 2020 School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China;

Application Of Virtual Reality In Plc Gas-Fired Boiler Training System, Dahu Wang, Chen Xia, Huizheng Gao

Journal of System Simulation

Abstract: In view of the problem that traditional training methods for PLC debugging can not show the running states of controlled objects in full angles, a PLC virtual simulation training platform is designed based on virtual reality technology. The system is composed of upper computer and lower computer connected by RS232 bus. The upper computer uses 3ds Max to model and render facilities, and uses Unity3D to construct the complete virtual scene. The lower computer designs PLC control board to control the virtual gas-fired boiler, which transmits data between PLC and virtual scene through the communication module. The test result …


Modeling And Simulation Of Heat Transfer Process Of Coke Oven Twin Flue, Kun Shen, Wang Ling, Tianyu Ma 2020 1. Institute of Physics and Information Science, Hunan Normal University, Changsha 410081, China;;2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;

Modeling And Simulation Of Heat Transfer Process Of Coke Oven Twin Flue, Kun Shen, Wang Ling, Tianyu Ma

Journal of System Simulation

Abstract: To study the heat transfer process of flues in 5.5m coke oven with waste gas circulation, the heat transfer mechanism of flue in coke oven's combustion chamber and gas exchange process of twin flue were analyzed; the simulation models of upflow flue and downflow flue were built respectively. According to tables of coke pushing and coal charging sequence in coking production, combining with gas exchange process in twin flue, the simulation analysis on surface temperature characteristics of twin flue walls in real coking production process were achieved by the designed simulation model. The simulation results show that …


Credibility Evaluation Of Hardware-In-The-Loop Simulation Test For Guided Weapons, Jianbin Dou, Xiaobing Wang, Bin Shan, Zhang Yan 2020 China HuaYin Ordnance Test Center Key Lab of Guided Weapons Test and Evaluation Simulation Technology, Huayin 714200, China;

Credibility Evaluation Of Hardware-In-The-Loop Simulation Test For Guided Weapons, Jianbin Dou, Xiaobing Wang, Bin Shan, Zhang Yan

Journal of System Simulation

Abstract: The thesis explained the concept of credibility evaluation of hardware-in-the-loop simulation. The models and the processes were introduced in three parts: credibility evaluation of simulation system, monitoring of simulation test process, and credibility evaluation of simulation results. The credibility evaluation model of hardware-in-the-loop simulation system was built based on TOPSIS and the credibility evaluation model of simulation results was built based on simulation and firing practace. This way could answer the credibility of hardware-in-the-loop simulation, and provide strong support for hardware-in-the-loop simulation in guided weapons test and evaluation.


Application Of Distributed Clustering In Anomaly Detection Of Farm Environment Data, Deng Li, Honglin Pang, Ling Wang, Minrui Fei 2020 1. School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China;;2. Shanghai Key Laboratory of Power Station Automation Technology, Shanghai 200072, China;

Application Of Distributed Clustering In Anomaly Detection Of Farm Environment Data, Deng Li, Honglin Pang, Ling Wang, Minrui Fei

Journal of System Simulation

Abstract: The massive farm environment data stored in the distributed system should be dealt with so as to provide abnormal environment reference and make preventive strategies for crop yield. Considering the characteristics of the farm environment data, the Dirichlet Process Mixture Model (DPMM) clustering is implemented with the farm environment data on Hadoop and the anomaly detection method of the farm environment is proposed based on clustering analysis. Under the framework of MapReduce, Map stage implements the distribution of the sample points to the models; Reduce stage completes the update of models and the number of clusters. The performance has …


Application Of Kpca-Esn Method In Wi-Fi Based Indoor Positioning, Li Jun, Chen Ying 2020 College of Automation and Electrical Engineering, Lanzhou Jiao Tong University, Lanzhou 730070, China;

Application Of Kpca-Esn Method In Wi-Fi Based Indoor Positioning, Li Jun, Chen Ying

Journal of System Simulation

Abstract: Aiming at the problem that the positioning accuracy is affected by the dynamic indoor environment and time-varying received signal strength (RSS) values, a Wi-Fi based indoor positioning method using kernel principal component Analysis (KPCA) and echo state networks (ESN) is proposed. The KPCA method is used to preprocess the RSS fingerprints effectively and extract the nonlinear principal components of the inputs of the model. On the basis of KPCA, the extracted principal components are taken as the inputs to the ESN network, the nonlinear mapping between corresponding positioning features and physical locations is then established by the ESN. …


Truck Scheduling For Delivering Containers Among Multiple Container Terminals Based On Truck Appointment System, Houming Fan, Zhenfeng Guo, Yang Yu 2020 1. School of Transportation Management, Dalian Maritime University, Dalian 116026, China;;2. Institute of Strategy Management and System Planning, Dalian Maritime University, Dalian 116026, China;

Truck Scheduling For Delivering Containers Among Multiple Container Terminals Based On Truck Appointment System, Houming Fan, Zhenfeng Guo, Yang Yu

Journal of System Simulation

Abstract: Based on thetruck appointment system which is used for coping with the serious congestion in the port caused by trucks irregular arrival at peak time, the truck scheduling problem for delivering containers from outside yard to multiple container terminals is studied.Under the premise of meeting the requirements of container arrivals for export vessels, a truck scheduling model is built to reduce the outside yard's operation cost with the objective of minimizing the quantity of the dispatched trucks. A modified ant colony algorithm is designed to solve the model, and the truck scheduling plan for delivering containers to different terminals …


Compressed Cooperative Eigenvalue Spectrum Sensing For Radio Signal, Jingjing Yang, Feng Yun, Zhigang Chen, Tang Hao, Huang Ming 2020 1. Wireless Innovation Lab, School of Information Science and Engineering, Yunnan University, Kunming 650091, China;;

Compressed Cooperative Eigenvalue Spectrum Sensing For Radio Signal, Jingjing Yang, Feng Yun, Zhigang Chen, Tang Hao, Huang Ming

Journal of System Simulation

Abstract: Detecting the abnormal radio emission through radio monitoring is an important task of radio management. A regional cooperative compressed spectrum sensing model is proposed. A multi-node sensing system based on software defined radio platform is built, and the effectiveness of cooperative spectrum sensing is demonstrated. Results show that a high detection probability could be achieved at a suitable decision threshold based on the test statistics extracted from the eigenvalue of the received signal; what's more, compressed spectrum sensing employed to the detection system greatly reduced the size of the data transmitted from the sensing nodes to the fusing node. …


A Dynamic Routing Protocol Which Can Achieve Fast Convergence Of Meo/Leo Network, Chengsheng Pan, Weigeng Lai, Huaifeng Shi 2020 Key Laboratory of Communication and Network, Dalian University, Dalian 116622, China;

A Dynamic Routing Protocol Which Can Achieve Fast Convergence Of Meo/Leo Network, Chengsheng Pan, Weigeng Lai, Huaifeng Shi

Journal of System Simulation

Abstract: In view of the routing convergence slow problem caused by the large delay and the topological structure high dynamic performance of the satellite network, a dynamic routing protocol which can achieve fast convergence of MEO/LEO double-layer satellite network routing is put forward. The protocol based on the combination of Virtual Topology Routing Strategy and link state routing protocol introduces the idea of network clustering. In the process of satellite network routing convergence, the whole network is divided into cluster management, and a covering clustering algorithm for MEO/LEO double layered satellite networks is proposed, which reduces …


Research And Implementation Of Egr Performance Evaluation For Turbocharged Diesel Engine, Xianghuan Zu, Yinyan Wang, Chuanlei Yang, Jianwei Du, Jialun Wang 2020 1. Harbin Engineering University, College of Power and Energy Engineering, Harbin 150001, China;;

Research And Implementation Of Egr Performance Evaluation For Turbocharged Diesel Engine, Xianghuan Zu, Yinyan Wang, Chuanlei Yang, Jianwei Du, Jialun Wang

Journal of System Simulation

Abstract: To solve the optimization of turbocharged diesel engine combustion and emissions performance for different EGR rate under different working conditions, the operation parameters of the diesel engine under different EGR rate was obtained through experiment at first; then the specific fuel consumption, NOx, soot and cylinder pressure were selected as decision targets and the evaluation model for turbocharged diesel engine performance under different EGR rate was established based on multi-objective grey decision, finally optimum EGR scheme was achieved. A simulation platform for EGR performance evaluation was designed by MATLAB which simplifies the modeling process and improves the …


Distributed Power Emergency Rescue Perception And Cooperative Information Interaction Technology, Xiaojun Xie, Hanchen Lu, Ruoxin Shi 2020 1. Information and Telecommunication Branch, State Grid Anhui Electric Power Company, Hefei 230061, China;;

Distributed Power Emergency Rescue Perception And Cooperative Information Interaction Technology, Xiaojun Xie, Hanchen Lu, Ruoxin Shi

Journal of System Simulation

Abstract: An emergency rescue technology for modern vehicle was proposed based on the implementation process of positioning, communication and task. The key subsystems of information processing and multi-link message in the rescue system were developed. The cooperative interaction method and technical scheme of emergency command system were based on multi-link communication. To improve the communication effectiveness between the emergency command center and emergency rescue vehicles under harsh conditions, the problems of short message communication and vehicle data transmission were solved by establishing a framework for directing side and the vehicle side. Design and implementation of the system through the field …


Modeling And Simulation Of Radar Networking Anti-Stealth Based On The Detection Probability, Bin Chen, Chuangming Tong, Ximin Li 2020 Air Force Engineering University, Xi'an 710051, China;

Modeling And Simulation Of Radar Networking Anti-Stealth Based On The Detection Probability, Bin Chen, Chuangming Tong, Ximin Li

Journal of System Simulation

Abstract: For the scene of stealth target penetration against radar network, an evaluation model of detection effectiveness is established by taking the detection probability of the netted radar as an evaluation index. Based on the target's Radar Cross Section (RCS) data, the relationships among the false alarm probability, detection probability and signal to noise ratio are analyzed. A method using signal detection probability of the radar network is proposed with the Rank “K” principle of the fusion center. The RCS of stealth target is analyzed utilizing physical optics and method of equivalent currents. The detection probability of radar …


Simulation Of Influence Of Lightning On Internal Electromagnetic Environment Of Computer, Gaihong Du, Yangmeng Tian, Caixia Wang, Hongwei Wang 2020 School of Applied Science of Beijing Information Science and Technology University, Beijing 100192,China;

Simulation Of Influence Of Lightning On Internal Electromagnetic Environment Of Computer, Gaihong Du, Yangmeng Tian, Caixia Wang, Hongwei Wang

Journal of System Simulation

Abstract: Through XFDTD software simulating strong lightning electromagnetic pulse of 50KV lightning electric field strength, rising edge about 50ns, and pulse width about 2000ns coupled with a desktop computer, the curves of the coupled electric field with time and the curves of the energy density with time at several typical locations in the chassis are obtained; the shielding effectiveness of different locations inside the computer is analyzed. Simulation results suggest that the electromagnetic field strength produced in the chassis has no damage to the computer node while coupling energy generated in the hole is large in comparison with the threshold …


Hybrid Rzf Precoding Algorithm For Massive Mimo System, Bin Xie, Shumin Xie, Shurui Liu 2020 School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;

Hybrid Rzf Precoding Algorithm For Massive Mimo System, Bin Xie, Shumin Xie, Shurui Liu

Journal of System Simulation

Abstract: In view of the high system complexity and high cost of the multi-user Massive MIMO system based on the traditional full digital precoding, a hybrid analog and digital RZF precoding is proposed. Based on the consideration of the channel noise, the inter-user interference and the system structure, the analog precoding matrix is sectionally designed with the combination of MRT precoding and RZF precoding, and for the digital part, a low dimension RZF precoding is used on the basis of the optimized channel matrix. After the optimization design, both the number of RF chain and the dimension of the digital …


Distributed Estimation Algorithm For Multi-Dimensional Multi-Choice Knapsack Problem, Tan Yang, Liu Zhang, Zhou Hong 2020 1. College of Computer Science, Human Normal University, Changsha 410081, China;;2. Human Radio and Television University, Changsha 410004, China;

Distributed Estimation Algorithm For Multi-Dimensional Multi-Choice Knapsack Problem, Tan Yang, Liu Zhang, Zhou Hong

Journal of System Simulation

Abstract: As it is difficult to realize local optimization of the Multidimensional Multiple-choice Knapsack Problem (MMKP), the Estimation of Distribution Algorithms (EDA) is applied to optimize the MMKP. In order to improve the local optimization ability of EDA, value weight factors of items for selection are built to improve the EDA initial model and probabilistic model updating methods. The impact of the extreme effects on the algorithm optimization process is balanced to overcome the defect that the local optimization ability of the traditional EDA is weak. A new non-feasible solution repair mechanism is adopted to maintain the facilitation of machine …


Sensorless Control Of Permanent Magnet Synchronous Motor With Improved Sliding Mode Observer, Li Jie, Wang Yan, Zhicheng Ji, Dahu Yan 2020 Engineering Research Center of Internet of Things Technology Applications Ministry of Education,Jiangnan University, Wuxi 214122, China;

Sensorless Control Of Permanent Magnet Synchronous Motor With Improved Sliding Mode Observer, Li Jie, Wang Yan, Zhicheng Ji, Dahu Yan

Journal of System Simulation

Abstract: With the purpose of improving the performance of sensorless control system of permanent magnet synchronous motor (PMSM), an improved sliding mode observer based on stator resistance online identification is proposed. These ctional hyperbolic tangent function is adopted as switching function, combined with variable sliding mode gain to weaken the high frequency chattering. Through the use of Lyapunov stability theory, the stator resistance online identification is adapted for improving the estimation accuracy of observer. Fractional order phase-locked loop is employed to estimate the rotor position and speed information from observed back EMF so that computing complexity caused by traditional phase …


Thermodynamic System Analysis Of A New Double-Bladder Accumulator, Zhao Wei, Ye Qian 2020 1. Fujian University of Technology, Fuzhou 350108, China;;

Thermodynamic System Analysis Of A New Double-Bladder Accumulator, Zhao Wei, Ye Qian

Journal of System Simulation

Abstract: A new double-bladder accumulator is introduced to improve the efficiency of bladder accumulator, and the dynamic equations for the new type accumulator are established. Based on the simulation results of temperature and pressure, the generalized Maxwell model of double-bladder accumulator is deduced, and the concept of thermodynamics spring is put forward. On account of simulation results, it shows that the new double-bladder accumulator has better operational efficiency and losses coefficient than that of the old type. The internal relations among the generalized Maxwell model, thermodynamics spring and operating parameters are analyzed with the purposes of upgrading design and proper …


Design Of Anti -Windup Controller For Srmdirect Instantaneous Torque System, Xiaofei Qin, Liu Jie, Li Feng 2020 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

Design Of Anti -Windup Controller For Srmdirect Instantaneous Torque System, Xiaofei Qin, Liu Jie, Li Feng

Journal of System Simulation

Abstract: In the direct instantaneous torque control system of switched reluctance motor, there is a nonlinear saturation in the speed outer loop controller. The integral control link of the controller will accumulate the error and increase the error gradually, resulting in the saturation effect of the controller and reducing the performance of the system. In this regard, an anti- windup adaptive PID controller is proposed on the basis of the traditional speed controller. This method integrates the input saturation error of controller and adjusts the integral term of controller by adaptive coefficient, so that it can quickly desaturation when the …


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