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4,159 full-text articles. Page 197 of 206.

Research On The Torque Ripple Of Brushless Dc Motor Under Non-Ideal Emf, Kun Xia, Bin Dong, Lu Jing 2019 Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

Research On The Torque Ripple Of Brushless Dc Motor Under Non-Ideal Emf, Kun Xia, Bin Dong, Lu Jing

Journal of System Simulation

Abstract: Non-ideal back-EMF waveform of brushless DC motor is unavoidable due to manufactory technology limitation, which contributes to the torque ripple and requires high performance controller to suppress the influence. Several back-EMF waveforms are analyzed and mathematical model of non-ideal back-EMF is proposed. The torque ripple under the non-ideal waveform is calculated and the relationship between torque ripple and the shape of back-EMF waveform is achieved by this model. The change of torque ripple under non-ideal back-EMF is simulated with driving current of square wave and sinusoidal wave. The results show the effectiveness of the back-EMF model for calculating …


Research On Virtual Reality Simulation System For Crew Cabin Of Special Vehicle, Yufei Jia, Xinjun Zhao, Junyan Zhao, Lingjie Kong, Kelei Huang 2019 1.The 63963th Unit of PLA, Beijing 100072, China; ;2.Science and Technology on Complex Land Systems Simulation Laboratory,Beijing 100072, China; ;

Research On Virtual Reality Simulation System For Crew Cabin Of Special Vehicle, Yufei Jia, Xinjun Zhao, Junyan Zhao, Lingjie Kong, Kelei Huang

Journal of System Simulation

Abstract: As a kind of new design method, virtual reality has been widely used in military, industrial, construction, medical, aerospace and other fields. A method for designing and demonstrating the crew cabin of special vehicle by visualized virtual reality simulation technology is introduced in this paper, which takes the design and demonstration of crew cabin of special vehicle in the future as example. The overall framework has been formatted through the design of system function and the detailed division of module. On the basis of the design for each functional software of the system, the functional modules are effectively supported …


Performance Comparison And Analysis Between Four In-Wheel-Motor Driving Electric Vehicle And Monomer-Motor Driving Electric Vehicle, Wang Feng, Guoqing Gong, Chen Yong, Bin Ma, Wenhai Li, Qiumeng Hou 2019 1.Beijing Information Science and Technology University, School of Mechanical and Electrical Engineering, Beijing 100192, China; ;

Performance Comparison And Analysis Between Four In-Wheel-Motor Driving Electric Vehicle And Monomer-Motor Driving Electric Vehicle, Wang Feng, Guoqing Gong, Chen Yong, Bin Ma, Wenhai Li, Qiumeng Hou

Journal of System Simulation

Abstract: The monomer-motor and front axle driving electric vehicle is changed intoa fourin-wheel-motor driving electric vehicle, and according to the design requirementsand the dimension parameters of the original model, the matching calculationand selection of the power systemof four in-wheel-motor electric vehicleare conducted.The structures of thepower transmission systemand their characteristics between the monomer-motor and the four-wheel driving electric vehicleare compared and analyzed; The simulation models of the monomer-motor and four In-Wheel-Motor electric vehicleare established by CRUISEand verifiedby the experimental data of the actual prototype.The performances of the in-wheel-motor electric vehicle are proved to be superior to those of …


Optimization Via Simulation Based On Neural Network, Shihui Wu, Xiaodong Liu, Shao Yue, Zhang Fa, Minxiang Yang 2019 1.Equipment Management and UAV Engineering College, Air Force Engineering University, Xi’an 710051, China; ;

Optimization Via Simulation Based On Neural Network, Shihui Wu, Xiaodong Liu, Shao Yue, Zhang Fa, Minxiang Yang

Journal of System Simulation

Abstract: To improve the efficiency of optimization via simulation (OvS), an OvS method based on neural network is proposed. Taking advantage of the approximation ability of neural network to nonlinear input-output relationship, neural network's outputs are used as substitutes for simulation results to reduce the required simulation runs. Samples are generated by simulation according to the three proposed samples selection methods. Owning to its advantages on learning speed, network stability and parameters selection, generalized regression neural network (GRNN) is adopted to train the samples. The trained GRNN forms a regression surface that represents the relationship between simulation inputs and outputs, …


Optimization Of Q-Btgsid Based On Sensitivity Analysis, Shuwei Jia 2019 School of Management, University of Shanghai for Science and Technology, Shanghai 200093, China;

Optimization Of Q-Btgsid Based On Sensitivity Analysis, Shuwei Jia

Journal of System Simulation

Abstract: In order to make up for the defect that relative degree of incidence, absolute degree of incidence and synthetic degree of incidence are limited in the range of (0.5, 1], this paper attempts to improve the degree of grey incidence. A control factor of “λ” and the metric space are set up to adjust. A new model is established and its specific properties are studied. It is proved that the new model satisfies the grey incidence axioms and the range of degree of grey incidence can be extended to (0, 1]. We put forward four principles of …


Numerical Simulation Of Moisture Diffusion Of Composite Solid Propellant, Yufeng Wang, Gaochun Li, Xudong Zhang, Qu Kai, Jinfei Li 2019 Department of Airborne Vehicle Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China;

Numerical Simulation Of Moisture Diffusion Of Composite Solid Propellant, Yufeng Wang, Gaochun Li, Xudong Zhang, Qu Kai, Jinfei Li

Journal of System Simulation

Abstract: In order to elucidate the humidity aging mechanism of composite solid propellant, the diffusion and the distribution of moisture inside the composite solid propellant under humidity was evaluated through the hygroscopic test of propellant. The mathematical and the FE model of moisture diffusion were proposed. The FEM was employed to simulate the moisture diffusion inside propellant. Moreover, the factors that affect the moisture diffusion were analyzed. The results showed that the humidity FEM can be used to simulate the hygroscopic process inside propellant. The temperature can affect the moisture diffusion. The higher the temperature is, the greater the …


Application Of Wavelet Transform In Simulation Model Validation Of Outboard Active Decoy, Hongxi Zhang, Zhang Jie 2019 Unit 93, No.91404 Troops of PLA, Qinhuangdao 066000, China;

Application Of Wavelet Transform In Simulation Model Validation Of Outboard Active Decoy, Hongxi Zhang, Zhang Jie

Journal of System Simulation

Abstract: Aiming at the characteristics that the output signal of outboard active decoy simulation model is non-stationary random signal, a simulation model verification method based on wavelet transform is proposed. The measured and simulated signals are decomposed into low frequency and high frequency parts by determining the wavelet function. For the low frequency part with stationary state, the characteristic data is obtained by parameter fitting with the least square method. For the high frequency part, AR model is used to fit the parameters, and the fitting parameters are used as the characteristic data, The correlation coefficient method is used to …


Modeling Of Distributed Service Composition System Based On Bipartite Network, Yaohui Hao, Jihong Han, Guo Hong, Shuxin Liu 2019 1.Information Engineering University of PLA, Zhengzhou 450001, China; ;2.State Key Laboratory of Mathematical Engineering and Advanced Computing, Zhengzhou 450001, China;

Modeling Of Distributed Service Composition System Based On Bipartite Network, Yaohui Hao, Jihong Han, Guo Hong, Shuxin Liu

Journal of System Simulation

Abstract: Distributed service composition system is widely used in military, communication and other fields.In order to reveal the system’s characteristics, a bipartite network model is proposed. The relation of sever-node’s degree distribution to the three factors of terminal-node’s expectation, terminal-node’s task load andlocal-world size is analyzed by the mean-field theory undercondition ofload balancing and random selection. Both numerical analysis and simulation results show that local-world and sever-node’s degree distribution are irrelevant with random selection.


Study Of Simulation And Influence Of Plunger Cavity Cavitation Water Axial Piston Pump, Zegang Sun, Mingheng Xu, Shide Xiao, Yuanlong Dai 2019 1.School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China; ;2.School of Mechanical Engineering, Southwest Jiaotong University, Chendu 610031, China; ;

Study Of Simulation And Influence Of Plunger Cavity Cavitation Water Axial Piston Pump, Zegang Sun, Mingheng Xu, Shide Xiao, Yuanlong Dai

Journal of System Simulation

Abstract: The finite element calculation model of water axial piston pump is established by the mixture hybrid and RNG κ-ε turbulence model of the Fluent software. The plunger movement and cylinder rotary are simulated by the dynamic mesh and sliding mesh. The UDF (User Defined Function) is used to set the compressibility of the fluid. It is found that the cavitation degree of plunger cavity is strongly related to m value (the ratio of the diameter of the plunger cavity to the equivalent diameter of the cylinder kidney shape hole). The mathematical model of mc without cavitation value is …


Multi-Objective Vulcanization Workshop Scheduling Based On Improved Harmony Search Algorithm, Wang Yan, Longcheng Wu, Zhicheng Ji, Dahu Yan 2019 Engineering Research Center of IoT Technology Applications Ministry of Education, Jiangnan University, Wuxi 214122, China;

Multi-Objective Vulcanization Workshop Scheduling Based On Improved Harmony Search Algorithm, Wang Yan, Longcheng Wu, Zhicheng Ji, Dahu Yan

Journal of System Simulation

Abstract: As a key link in tire production process, the scheduling plan of vulcanization process directly affects the efficiency of the whole tire production process. A discrete encoding method based on vulcanization order - tire number is proposed. An improved harmony search algorithm (IHS) is developed for scheduling the vulcanization workshop with the target of simultaneously minimizing the makespan, die-changing cost and machine idle rate. Vulcanization sequence and tire number are respectively discretized according to the harmony memory considering probability and pitch adjusting probability. The dynamic fine-tuning value is defined to fine-tune the processing number. Finally, the experimental results show …


Dynamic Decision-Making Modeling For Army Operation Command Post Entity, Kang Kai, Yongliang Zhang, Chenxi Li, Jintang Pan 2019 1.The Institute of Command Information System in PLA University of Science and Technology, Nanjing 210007, China; ;

Dynamic Decision-Making Modeling For Army Operation Command Post Entity, Kang Kai, Yongliang Zhang, Chenxi Li, Jintang Pan

Journal of System Simulation

Abstract: The paper presents a modeling method of dynamic decision-making for army operation command post entity based on the Bayesian Net (BN) to meet the demands of demonstrating the operational blue print and evaluating the plan with the support of subject matter experts and military rules. The method brings about the structured description for the decision-making rules, builds the BN model for battlefield situation, and actualizes the situation estimation based on the model of BN reasoning. Therefore it gives the reasonable analysis, the in-depth understanding and right dynamic estimation to the land battlefield dynamic situation, which embodies the complexity and …


An Autonomous Cognitive Model Simulating Basal Ganglia Mechanism, Zongshuai Li, Chen Jing 2019 1.School of electronic information and automation, Civil Aviation University of China, Tianjin 300300, China; ;

An Autonomous Cognitive Model Simulating Basal Ganglia Mechanism, Zongshuai Li, Chen Jing

Journal of System Simulation

Abstract: Aiming at autonomous cognition problem, applying the winner-takes-all(WTA) learning mechanism, using cortical-striatal synaptic modification principle in basal ganglia, as well as based on the operant conditioning reflex theory, the basal ganglia autonomous cognitive model is established, which is suitable for the cognitive learning with limited actions. Skinner's pigeons experiment was simulated by applying this bionic learning model, which showes a gradual process of adaptive learning. The simulation results reflect that the proposed cognitive model is effective and can be used in the balance learning for a self-balancing robot. In the premise of unknown robot mathematical model, the purpose of …


Cfd-Based Research On The Erosion Of The Fracturing Pump Valve Structure, Mo Li, Xiaobing Wang, Wang Jun, Guangcai Zhuang 2019 1.College of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China; ;

Cfd-Based Research On The Erosion Of The Fracturing Pump Valve Structure, Mo Li, Xiaobing Wang, Wang Jun, Guangcai Zhuang

Journal of System Simulation

Abstract: In view of the characteristic of severe erosion and abrasion in the fracturing pump valve, CFD-based erosion and failure is simulated and computed. The distributed rule of the pump valve lift, times of stroke, the height of the seal and the sealing contact length at a certain moment are shown. By analyzing the characteristic of the flow field from the simulated result and the failure mechanism of the fracturing pump valve, it is concluded that the lift is smaller, the greater is the flow velocity, the high times of stroke will increase the flow rate and the lag …


Synthetic Evaluationmethod Based On Grey Evaluation Method And Analytic Hierarchy Model Theory, Xiangyu Sun, Chao Tao, Songyan Wang, Ma Ping 2019 Control and Simulation Center,Harbin Institute of Technology, Harbin 150080, China;

Synthetic Evaluationmethod Based On Grey Evaluation Method And Analytic Hierarchy Model Theory, Xiangyu Sun, Chao Tao, Songyan Wang, Ma Ping

Journal of System Simulation

Abstract: To solve the problems that judging matrix is complex and evaluation information from experts is not always objective in Analytic Hierarchy Process (AHP) method during the unstructured decision making application, a new synthetic evaluationmethod based on grey evaluation method and analytic hierarchy model theory (AHM) isproposed. GroupAHM method is used to judge the relative weight between any two of indexes based on relative weight evaluation information from experts in the relevant research field and grey evaluation method is used to synthesize the index evaluation information from experts. Evaluation result is obtained by mapping synthesizing result of relative property weight …


Optimum Design Of Remote Delivery Capsule’S Driving Mechanism Based On Electromagnetic-Permanent Magnet, Zhengping Lu, Xudong Guo, Tangcheng Xu, Ruihua Qin 2019 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

Optimum Design Of Remote Delivery Capsule’S Driving Mechanism Based On Electromagnetic-Permanent Magnet, Zhengping Lu, Xudong Guo, Tangcheng Xu, Ruihua Qin

Journal of System Simulation

Abstract: To achieve fast, reliable and controllable drug delivery in the gastrointestinal lesions, a suitable delivery driving mechanism was studied. The structure of the driving mechanism was designedto overcome the magnetic force decaying rapidly with distance, whichcan satisfy the demands of the drug delivery for the large dose and long driving stroke.By combining the orthogonal test theory and the finite element simulation, the magnetic driving forcehas been calculatedforthe parameters of the electromagnetic coil and permanent magnet in different combinations of the values. The structure parameters of the electromagnetic coil and the permanent magnethave been optimizedto achieve the …


Modeling Of Nonlinear Industrial System At All Operating Conditions Based On State Tracking, Dong Ze, Erxin Yin 2019 Hebei Engineering Research Center of Simulation & Optimized Control for Power Generation (North China Electric Power University), Baoding 071003, China;

Modeling Of Nonlinear Industrial System At All Operating Conditions Based On State Tracking, Dong Ze, Erxin Yin

Journal of System Simulation

Abstract: From the prospective of industrial big data modeling, this paper presents a modeling method for nonlinear industrial system at all operating conditions based on state tracking. In view of large amount of historical data and the difficulty to screen the modeling data, a sliding window is designed to screen steady-state data. The fast calculation method for the standard deviation is deducted. The influence mechanism of unknown disturbance on the system is analyzed. The data segment, representing the system from dynamic state to stable state, is selected as the modeling data. A data-driven modeling algorithm, which can effectively eliminate the …


Mathematical Modeling And Simulation Of Hydraulic Governor For Marine Diesel Engine, Chen Jian 2019 1.School of Marine Engineering, Jimei University, Xiamen 361021, China; ;

Mathematical Modeling And Simulation Of Hydraulic Governor For Marine Diesel Engine, Chen Jian

Journal of System Simulation

Abstract: The speed control and load limit of marine diesel engine are implemented by hydraulic governor, of which the characteristics directly determines the performance of generator set. Therefore, it is an important content of marine engine room simulator training to strengthen the students’ training and understanding of the working characteristics of the hydraulic governor. In the existing marine engine room simulators, the simulation model of hydraulic governor is too simple to carry out further training tasks. According to the working principle of hydraulic governor and the training purpose of marine engine room simulator, the mathematical model of UG-8 hydraulic governor …


Implement Objective Motion Cueing Test On The A320 Full Flight Simulator, Yang Yang 2019 Training Centre of Sichuan Airlines Group Co., Ltd, Chengdu 611731, China;

Implement Objective Motion Cueing Test On The A320 Full Flight Simulator, Yang Yang

Journal of System Simulation

Abstract: Pilot’s subjective evaluation has been used for motion cueing tuning and calibration for years, and widely recognized as the major criteria in civil full flight simulator qualification. Due to the diversity of human perception, it is impossible to reproduce the same motion cueing on different simulators. In order to objectively evaluate the A320 full flight simulator motion cueing system performance, an engineering practice has been carried out recently by implementation of the OMCT(Objective Motion Cueing Test)which was published by ICAO in 2015. It aims to measure the signal transport delay between the flight model and motion platform, through analyzing …


Vibration Simulation And Damping Ratio Optimization Of Seat Suspension System For High-Speed Rail, Changcheng Zhou, Yuewei Yu, Leilei Zhao 2019 School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China;

Vibration Simulation And Damping Ratio Optimization Of Seat Suspension System For High-Speed Rail, Changcheng Zhou, Yuewei Yu, Leilei Zhao

Journal of System Simulation

Abstract: According to the 1/4 body-seat vertical vibration model of high-speed rail, an optimal design simulation model for damping ratio of seat suspension was established. An optimal design mathematical model for damping ratio of seat suspension was built with the optimal ride comfort as the target. Taking the track vertical irregularity as input and the seat suspension vertical stroke as constraint condition, an optimization design method for damping ratio of seat suspension based on track excitation was presented. With a practical example, the damping ratio was designed and validated by simulation. The results show that the damping ratio value …


Channel Modeling And Simulation Of Wireless Underground Sensor Networks Based On Magnetic Induction Technology, Zhouzhou Liu, Shen Liang 2019 1.School of Computer Science, Northwestern Polytechnical University, Xi’an 710072, China; ;2.School of Electronic Engineering, Xi’an Aeronautical University, Xi’an 710077, China;;

Channel Modeling And Simulation Of Wireless Underground Sensor Networks Based On Magnetic Induction Technology, Zhouzhou Liu, Shen Liang

Journal of System Simulation

Abstract: Aiming at the problem of high path loss, huge dynamic changes of channel conditions and large antenna size of the electromagnetic wave communication channel in wireless underground sensor networks ( WUSN), the channel characteristics of magnetic induction (MI) in the process of WUSN transmission are studied and the transmission principle of harmonic source in soil strata is analyzed. The influence of the polarization direction of the coil and the eddy current loss coefficient on the channel model is analyzed by the transmission equivalent circuit diagram, and the influence of the change of the frequency and the distance on the …


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