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4,223 full-text articles. Page 135 of 209.

Study On Tracking Filter Algorithms For Nonballistic Targets In Near Space, Yajie Cao, Junlong Li, Qin Lei 2020 1. Unit 95899 PLA, Beijing 100085, China;;2. The Second System Design Department of the Second Research Academy of CASIC, Beijing 100854, China;

Study On Tracking Filter Algorithms For Nonballistic Targets In Near Space, Yajie Cao, Junlong Li, Qin Lei

Journal of System Simulation

Abstract: Recently, different countries made rapid developments in the field of hypersonic aircraft in near space. The successful flight tests of hypersonic aircraft X-51A and HTV-2 were representative.They adopted the way of nonballistic maneuver flight whose motion trajectory was characterized by “hopping”, which existed the problems of difficulties of nonballistic target acceleration estimation, trajectory tracking and prediction. Four typical nonballistic maneuver models of near space targets of tracking filter are introducedand then target ballistic equation and design of tracking filter are introduced. At last, an estimation of four tracking filter ways is maken towards target acceleration. The effect of particle …


Control Strategy Of Bionic Eyes Movement In Gaze Shifts, Xiaohui Wang, Ma Xin, Bin Qin, Yibin Li 2020 1. School of Control Science and Engineering, Shandong University, Jinan 250061, China;;2. School of Applied technology, Qingdao University, Qingdao 266101, China;

Control Strategy Of Bionic Eyes Movement In Gaze Shifts, Xiaohui Wang, Ma Xin, Bin Qin, Yibin Li

Journal of System Simulation

Abstract: For the gaze shifts with asymmetrical depth in the horizontal plane of bionic eyes, a piecewise control strategy of eye-head coordinative motion was proposed according to the amplitude of gaze shifts, and the motion model of bionic eyes was developed. When the amplitude of gaze shifts is smaller than the head movement threshold, the eyes move only by saccade-vergence. When the amplitude is larger than the head movement threshold and smaller than the saturation threshold of eye movement with head at rest, gaze shifts are accomplished with eye-head coordinative movements. When the amplitude is larger than the saturation threshold, …


Design And Implementation Of Secure Usb Connection, Songyin Zhao, Bin Yu 2020 Information Engineering University, Zhengzhou 450000, China;

Design And Implementation Of Secure Usb Connection, Songyin Zhao, Bin Yu

Journal of System Simulation

Abstract: Aiming at the deficiency of present secure solutions countering USB-based Hardware Trojan Horse, BadUSB, bus wiretapping and other new attack technologies, a secure connection scheme applying to any USB device was proposed. In scheme, mutual authentication and key exchange were implemented by extending the standard device request in the hub driver and USB device framework driver to prevent the creation of malicious USB connection. Meanwhile, all the data transferred of the created USB connection would be filter encrypted by USB bus driver and USB device framework driver to rebel the monitor of bus. The experiment results show that the …


Research And Implementation Of Simulation For Aircraft Crossing The Low-Level Wind Shear Area, Zhigang Su, Chen Qi, Jingtang Hao 2020 1. Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China;;2. Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;

Research And Implementation Of Simulation For Aircraft Crossing The Low-Level Wind Shear Area, Zhigang Su, Chen Qi, Jingtang Hao

Journal of System Simulation

Abstract: Low-level wind shear seriously affects the safety of approach and departure of flights, the flight simulation system is utilized for analyzing low-level wind shear influences on aircraft take-off and landing, which is of great significance for seeking the safety circumvention strategy of aircraft crossing the core of the storm. With software, Fluent, the system simulated the regional wind field of low-level wind shear, and utilized the open source flight simulator, FlightGear, as the aircraft simulation platform. The system sent the wind speed data as the input of system via UDP(User Datagram Protocol) interface and the influences on aircraft flight …


Numerical Simulation Of Cavitation And Failure Analysis In Hydraulic Loader, Mo Li, Yang Qi, Yumei Wang 2020 1. Departmentof Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;;

Numerical Simulation Of Cavitation And Failure Analysis In Hydraulic Loader, Mo Li, Yang Qi, Yumei Wang

Journal of System Simulation

Abstract: Using software CFX with SST κ-ω model and Rayleigh-Plesset cavitation model, the numerical simulation of 3-D steady flow with water liquid and water vapour two phases in whole flow passage of hydraulic loader was conducted. The influences of different parameters (inlet flow rate, rotational speed and blade angle) on cavitation of hydraulic loader were studied. The results show that, under small flow rate, large blade angle (≥60°) and low speed (≤3 000 r/min), cavitation is light. At different working conditions, where cavitation appears in radial direction of position is the same. The cavitation mainly distributes where the r/R …


Robustness Research For Adaptive Control Algorithms Of Pipe Conveying Fluid Vibration, Chen Bing, Yuanyuan Huang, Zhongjun Yin 2020 School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China;

Robustness Research For Adaptive Control Algorithms Of Pipe Conveying Fluid Vibration, Chen Bing, Yuanyuan Huang, Zhongjun Yin

Journal of System Simulation

Abstract: Pipes with supported ends may lose their dynamic stability due to parametric instability when they convey pulsating fluid. the piezoelectric actuators were taken as the control actuators, and built a controlling mathematical model of the pipeline system. Then aiming at the traditional PID controller’s poor robustness on pipeline system parameters, MRAC system and MRAC system based on adaptive gain of the PD were designed on the basis of Lyapunov stability theory, not only the vibration peak values of the pipeline system were suppressed in a short time, but also the controllers had better robustness on pipeline system parameters. Control …


Research On Simulation Optimization Of Container Terminal’S Machinery Configuration, Zhaohui Duan, Bingliang Song 2020 1. School of Economics and Management, Shanghai Maritime University, Shanghai 201306, China;;2. Shanghai International Port (Group) Co. , Ltd. , Shanghai 200080, China;

Research On Simulation Optimization Of Container Terminal’S Machinery Configuration, Zhaohui Duan, Bingliang Song

Journal of System Simulation

Abstract: The optimization of the machinery allocation under the double constraints of maximized efficiency for loading and unloading processes and optimal machinery usage, and the optimal configuration of bridge cranes under discrete operation modes for a single ship were instigated through modeling with the simulation software Extendsim. It was found that the real-time recording method is a more straightforward and convenient way to investigate the optimal mechanical configuration and double constraints lead to different but more reasonable results than that was obtained under the single constraint on the best mechanical configuration. Due to the discrete characteristics of the bridge crane …


Research On Identification Of Induction Motor Parameters Ased On Nameplate Data And Pso, Xingwu Wang, Bingshu Wang, Zhaoyan Zhang, Zhibin Liu 2020 1. Department of Automation North China Electric Power University, Baoding 071003, China;;2. Baoding Simosimu Technology Co. , Ltd. , Baoding 071051, China;

Research On Identification Of Induction Motor Parameters Ased On Nameplate Data And Pso, Xingwu Wang, Bingshu Wang, Zhaoyan Zhang, Zhibin Liu

Journal of System Simulation

Abstract: A new method was proposed based on motor nameplate and particle swarm optimization (PSO) for identification of motor equivalent circuit parameters. The method effectively solved to present problems of motor equivalent circuit parameters identification method. An accurate motor equivalent circuit was built by introducing an equivalent stray-loss resistance, mechanical loss, and slip loss of ring brushes for wound motor. An identification optimization model of equivalent circuit was established based on motor nameplate parameters and motor equivalent circuit’s calculating parameters. Solving optimization model with PSO was achieved a higher probability optimization goals. The motor electrical parameters were calculatd at …


Name-Embedded Couplet Creation Based On Mobile Platform, Weihua Shen, Shicheng Zhang, Shunting Wang, Zhigeng Pan 2020 1. Lishui University, Lishui 323000, China;;

Name-Embedded Couplet Creation Based On Mobile Platform, Weihua Shen, Shicheng Zhang, Shunting Wang, Zhigeng Pan

Journal of System Simulation

Abstract: Couplet culture is the crystallization of Chinese traditional culture, and also is the gem of Chinese language. Given the broad mobile intelligent terminal user groups, in order to inherit and carry forward the Chinese traditional culture, Android and iOS system were taken as the design platform, combining the couplet culture and modern science and technology in an organic whole based on the study of name-embedded couplet generation algorithm. The users were allowed to get personalized couplet belong to themselves conveniently and quickly by mobile platform. The name-embedded couplet creation software was expounded in the following areas: design concept, …


Development Trend Of Next Generation 3d Graphics Engines, Zhao Wei, Mao Ping, Fanyu Shen 2020 Aviation Institute of Naval Academy, Shanghai 200436, China;

Development Trend Of Next Generation 3d Graphics Engines, Zhao Wei, Mao Ping, Fanyu Shen

Journal of System Simulation

Abstract: The development, relationship and differences between game engine and virtual reality engine were introduced, a joint name of 3D graphics engine was proposed. The bottlenecks and shortages of scene management, geometry model creating, physics simulation, lighting, shading, etc. were analyzed by synthetically considering the advancements in computer hardware, softwares and simulation theories, etc.. The development demands and trends were researched, the Concept of adaptive multi-thread shading technology, advanced real-time dynamic deformation technology, integrated collision detection technology, independent of the collision process technology were proposed for the first time, and a brief features description of these concepts were give, it …


Parametric Approachfor Automatic Generation Of Finite Element Modelfor Dental System, Wei Yi, Dengming Zhu 2020 1. School of Mathematics and Computer, Wuyi University, Wuyishan 354300, China;;3. Fujian Provincial Key Lab of Cognitive Computing and Intelligent Information Processing, Wuyishan 354300, China;

Parametric Approachfor Automatic Generation Of Finite Element Modelfor Dental System, Wei Yi, Dengming Zhu

Journal of System Simulation

Abstract: Aiming at overcoming the disadvantages of currentmodeling methods for dental system, such as poor efficiency and lack of personality, a method for automatic generation of finite element model for personalized dental systemis proposed. On the basis ofthe original 3Ddental model, a3Dmodel of pericementum and phatnomaiscreatedby technology of solid modeling.According tothe configuration parameters of dentition and finite elements, a finite element model of the personalized dental system is generated. Based on Ansys parametric design language, anautomatic finite element modeling system of dental system is implemented. By this modeling system, experiments are performed based on the real data of dental system …


Parameter Identification Method Based On Lagrangemultiplier And Measuring Residual Error, He Zhi, Zhicheng Nie, Yining Qin, Youping Fan 2020 1. China Southern Power Grid EHV Power Transmission Company Qujing Division, Qujing 655000, China;;

Parameter Identification Method Based On Lagrangemultiplier And Measuring Residual Error, He Zhi, Zhicheng Nie, Yining Qin, Youping Fan

Journal of System Simulation

Abstract: To satisfy the security and stability control, transient and steady state analysis of power system, it is necessary to ensure the accuracy of the estimated parameters. A method of parameter identification in power system based on Lagrange multiplier and measurement method of residualis proposed through analysis of measurement residuals. A two-step approach for parameter identification is introduced. Based on Lagrange multiplier method, using thestandardized Lagrange multiplier corresponding to the parameter error the parameters with errors can be judged by the size relative to the threshold and can bedetected and identified automatically. The residual vector of measurement redundancy is …


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. …


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