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4,171 full-text articles. Page 195 of 207.

Design And Research On Mechanism Model Of Cyclone, Zhang Yue, Han Pu 2019 Hebei Engineering Research Center of Simulation & Optimized Control for Power Generation, North China Electric Power University, Baoding 071003, China;

Design And Research On Mechanism Model Of Cyclone, Zhang Yue, Han Pu

Journal of System Simulation

Abstract: The operating characteristics of the cyclone separator greatly affect the overall operating efficiency of the boiler, the gas-solid two-phase flow in the cyclone separator is complicated by the vortex flow. The mathematical model of different angles has been too complicated or one-sided to show its running mechanism. A mechanism model of the internal parameters of a cone assembly and a counter current cyclone separator has been established. The three cutting diameter calculation methods have been compared for grade separation efficiency. The pressure drop has been combined with the pressure drop of the subdivision of the system structure, and the …


Key Frame Extraction For Slam Based On Spatio-Temporal Slices, Xinliang Zhang, Li Yang, Yunji Zhao 2019 School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China;

Key Frame Extraction For Slam Based On Spatio-Temporal Slices, Xinliang Zhang, Li Yang, Yunji Zhao

Journal of System Simulation

Abstract: To deal with the data redundancy and computational complexity of the mobile robot 3D visual SLAM (simultaneous localization and mapping), a key frame extraction technique based on spatio-temporal slices is proposed. Based on the analysis of the texture characteristics of the spatio-temporal slices, it yields that the motion state of the image acquisition device can be represented by the slope change of the texture. The similarity degree between two adjacent slices is measured to find out the key frame by use of the nearest neighbor pixel-matching algorithm, which can accurately describe the motion state of the device …


Design Of Real-Time Digital Baseband Simulator For Spatial Information Networks, Jianfeng Liu, Ma Shang, Zeguo Yang, lixiang Liu, Jianhao Hu 2019 1. National Key Laboratory of Science and Technology on Communication, Chengdu 611731, China; ;

Design Of Real-Time Digital Baseband Simulator For Spatial Information Networks, Jianfeng Liu, Ma Shang, Zeguo Yang, Lixiang Liu, Jianhao Hu

Journal of System Simulation

Abstract: The commonly used channel simulators always focus on the characteristics of RF signals at the receiver. However, they are costly in real-time simulation for spatial information network with multi-link and dynamic topology change. In this paper, a scalable simulator architecture for spatial information network, a simulation method for dynamic topology and channel propagation characteristics based on baseband data packages are presented. Based on this, a real-time spatial information networks simulation platform is designed and implemented. The platform can simulate the channel propagation delay, bit error, and dynamic topology changes for spatial information network. It supports 16 to …


Simulation Of Blade Erosion Of Variable-Pitch Axial Flow Fan, Chunxi Li, Zhang Dan, Xuemin Ye 2019 Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Minstry (North China Electric Power University), Baoding 071003, China;

Simulation Of Blade Erosion Of Variable-Pitch Axial Flow Fan, Chunxi Li, Zhang Dan, Xuemin Ye

Journal of System Simulation

Abstract: Affected by the performance of dust precipitators, significant differences of blade erosion regimes and erosion rates in induced draft fans are exhibited due to various particle diameters and concentrations. A 3D numerical simulation on a single-stage axial fan is carried out using Fluent to investigate the blade erosion regimes. The important features including particle trajectories under different particle diameters, erosion pattern and particle mass concentration distribution on the pressure and suction surfaces are examined, and the effect of particle mass concentration on erosion rate is analyzed. The results show that the erosion regimes are mainly affected by particle diameter. …


Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui 2019 School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui

Journal of System Simulation

Abstract: In order to improve the production process quality of four-roll plate bending machines, a four-roll bending mathematical model is established and a finite element simulation is used to verify its accuracy. The influence of side roller displacement, sheet thickness, and rotational speed on the radius and quality of the final shaped plate are analyzed. The simulation results show that as the displacement of side roll increases, the downtrend of the sheet forming radius gradually slows down and the quality of the formed sheet also decreases. Plastic strain fluctuation on plate surface decreases as the thickness increases, quality of thick …


Network Mode And Economy Analysis Of Photovoltaic-Battery System In Microgrid, Weiqing Sun, Liu Tong, Liu Bo, Youjia Wang 2019 1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;; ;

Network Mode And Economy Analysis Of Photovoltaic-Battery System In Microgrid, Weiqing Sun, Liu Tong, Liu Bo, Youjia Wang

Journal of System Simulation

Abstract: Due to its various power sources, flexible operation modes and ability of making full use of distributed energy resources, microgrid has received broad attention. Focusing on the two different network modes of photovoltaic-battery system (PVBS), the power flow distribution of photovoltaic-battery hybrid system (PVBHS) and photovoltaic-battery integrated system (PVBIS) under different operation conditions are analyzed separately and the corresponding operational economy calculation model is proposed. Using the life cycle cost (LCC) analysis method, the economy of PVBHS and PVBIS is compared. A 6-bus microgrid lab system and the IEEE 33-bus test system are taken as the study case. Results …


Research On Fault Detection And Isolation Method For Typical Hydraulic System, Lixia Zhang, Fuzhou Feng, Xiangbo Liu, Wang Min 2019 1. Department of Vehicle Engineering, Academy of Army Armored Force Engineering, Beijing 100072, China; ;

Research On Fault Detection And Isolation Method For Typical Hydraulic System, Lixia Zhang, Fuzhou Feng, Xiangbo Liu, Wang Min

Journal of System Simulation

Abstract: The integrated transmission device possesses some inherent characteristics of the multiple working modes, discontinuity, multi-coupling, which lead to problems such as the fault detection difficulty and fault isolation inaccuracy. Analyzed in detail the structure and working principle of torque converter compensation circuit, the bond graph modeling and diagnosis methods were studied. Then the relationship between global analytical redundancy and fault characteristic matrix is established, which accurately accomplishes the fault detection and isolation. Finally, the rules between the analytical redundancy relations and different faults are verified by simulation experiments, which indicate that the design and application of FDI based on …


Orm-Dcsk: A Novel Dcsk Communication Scheme, Zhang Gang, Chuangang Wang, Guoquan Li, Jinzhao Lin 2019 1. Chongqing Key Laboratory of Signal and Information Processing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China; ;

Orm-Dcsk: A Novel Dcsk Communication Scheme, Zhang Gang, Chuangang Wang, Guoquan Li, Jinzhao Lin

Journal of System Simulation

Abstract: To overcome the intra-signal interference components and the large average bit energy existing in decision variables, an improved RM-DCSK algorithm, named ORM-DCSK, is proposed. An orthogonal chaotic generator is designed to eliminate the intra-signal interference components. Besides, the signal frame format is expanded to reduce the average bit energy. The BER is derived and simulated in AWGN channel. The simulation results show that ORM-DCSK performs greatly better in BER performance than RM-DCSK algorithm without sacrificing transmission rate.


Adaptive Real-Time Tracking Control System For Ammonia Desulphurization, Lixin Ma, Mengyuan Lü 2019 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

Adaptive Real-Time Tracking Control System For Ammonia Desulphurization, Lixin Ma, Mengyuan Lü

Journal of System Simulation

Abstract: In the ammonia desulphurization system, we can use forecast devices to compensate the delay time of sensor in the process of detection. But the error of the parameters in the mathematical model of the method has a great influence on the performance of the control system. So it is unable to realize the real-time tracking of the load. Concerning this problem, we put forward a kind of real-time tracking control system based on model reference adaptive technology which could be able to track the load—model reference adaptive technology is used in the ammonia desulphurization technology. It breaks the normal …


Prediction Of Alumina Density Based On Lssvm, Guimei Cui, Haijin Yang, Piliang Liu, Yu Kai 2019 1. School Of Information Engineering, Inner Mongolia University Of Science & Technology, Baotou 014010, China;; ;

Prediction Of Alumina Density Based On Lssvm, Guimei Cui, Haijin Yang, Piliang Liu, Yu Kai

Journal of System Simulation

Abstract: The prediction model of alumina density based on the PSO algorithm with swarm activity to optimize LSSVM method is built. According to the production process characteristics of aluminum electrolysis and historical data, the input variables of the model is determined. It can solve these problems that Particle Swarm Optimization (PSO) algorithm is with the risk of premature convergence and least square support vector machine is time consuming with parameter selection. The method uses swarm activity as diversity index. When swarm activity is quickened to descend, evolution operation is added to modify the positions or velocities of particles to …


Complete Coverage Belief Function Path Planning Algorithm Of Autonomous Underwater Vehiclebased On Behavior Strategy, Wenyang Gan, Daqi Zhu 2019 Laboratory of Underwater Vehicles and Intelligent Systems, Shanghai 201306, China.;

Complete Coverage Belief Function Path Planning Algorithm Of Autonomous Underwater Vehiclebased On Behavior Strategy, Wenyang Gan, Daqi Zhu

Journal of System Simulation

Abstract: For the complete coverage path planning of autonomous underwater vehicle (AUV), a complete coverage belief function path planning algorithm based on behavior strategy is proposed by introducing the behavior strategy and using the concept of map belief function, which can make AUV accomplish the complete coverage and avoid obstacles automatically. The grid belief function is constructed based on environmental information, using different function values to distinguish between the obstacle, the covered and the uncovered grid. AUV selects the next navigation position by path planning strategy. Next navigation position is selected by behavior strategy if AUV navigates to the …


Gradient Descent Self-Tuning Control Of Flexible Space Manipulator After Capturing Operation, Cheng Jing, Chen Li 2019 1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China; ;2. Fujian Provincial Collaborative Innovation Center of High-End Equipment Manufacturing, Fuzhou 350116, China;

Gradient Descent Self-Tuning Control Of Flexible Space Manipulator After Capturing Operation, Cheng Jing, Chen Li

Journal of System Simulation

Abstract: The flexible vibration is generated after all-flexible space manipulator capturing a satellite, and the collision leads to unsteadiness of system. For the unstable composite system, the self-turning control algorithm based on hybrid trajectory is designed in this paper. The theory of gradient descent is used for parameter adaptive rate design to realize the real time adjustment of the PID control parameters. A supervised controller is designed through Lyapunov function to generate the stability and H∞ tracking characteristic of the system. The hybrid trajectory is generated based on the concept of virtual force, which is used to accomplish …


Design And Implementation Of Human-Computer Interactive System For Public Information Service In Smart City, Han Feng, Xiaoling Li, Xiuwen Sun, Lingyu Ji 2019 Xi'an Jiaotong University, Xi’an 710049, China;

Design And Implementation Of Human-Computer Interactive System For Public Information Service In Smart City, Han Feng, Xiaoling Li, Xiuwen Sun, Lingyu Ji

Journal of System Simulation

Abstract: In view of the singleness on the interactive contents and forms of public information services in Smart City, we design and implement a human-computer interactive system. We analyze both user behavior characteristics as self-portrait effect, landing effect, honeypot effect and Smart City application design characteristics as socialization, intellectualization and humanization. Regarding these characteristics, we specify the interactive contents and the corresponding interactive forms and design the UI features for improving user experience. We research on the technologies involved in the implementation of the system, including gesture recognition based on segments, face recognition and resource integration using WPF, besides, holographic …


Bound Analysis Of Signal Processing Method On Laser Doppler Velocity & Vibration Measurement, Peng Xiang, Liu Bo 2019 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China;

Bound Analysis Of Signal Processing Method On Laser Doppler Velocity & Vibration Measurement, Peng Xiang, Liu Bo

Journal of System Simulation

Abstract: Laser Doppler measurement technology has attracted more and more attention and application in the field of high precision measurement. For different signal characteristics and processing methods, there are different constraints of the measurement, which would determine the measurement precision and accuracy. Based on the principle of laser Doppler velocity & vibration measurement and from the perspective of digital signal processing, the constrains related to the sampling rate, data length and time interval are analyzed. The time-interval homogenization processing method of the second sampling data, and the effect on the measurement range of aliasing about reference light frequency and signal …


A Study Of Adaptive Simulated Annealing Particle Swarm Optimization (Asapso) Algorithm For Building Pipe Routing Design, Changtao Wang, Xiaotong Sun, Zhonghua Han, Zhu Yi 2019 School of Information and Control Engineering, Shenyang Jianzhu University, Shenyang 110168, China;

A Study Of Adaptive Simulated Annealing Particle Swarm Optimization (Asapso) Algorithm For Building Pipe Routing Design, Changtao Wang, Xiaotong Sun, Zhonghua Han, Zhu Yi

Journal of System Simulation

Abstract: To solve the building pipe routing design problem, a mathematical model was formulated. The length of pipe, the number of bends and the laying area were taken as the comprehensive evaluation indexes. Adaptive Simulated Annealing Particle Swarm Optimization (ASAPSO) algorithm was proposed for optimization. In the ASAPSO algorithm, a self-adaptive parameter adjusting strategy and simulated annealing algorithm adjusting the optimal particle location were introduced to enhance the capacity in escaping from the local optimal. A new population initialization method based on the cost of selection probability was designed at the initial population. The simulation showed that compared with the …


Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu 2019 1. Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System, Tianjin 300384, China; ;

Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu

Journal of System Simulation

Abstract: Aiming at the uncertainty of the dynamics system of reconfigurable manipulator, a control law based on the fuzzy adaptive algorithm is proposed to adaptively approach the friction and external disturbance in the system, achieving the compensation control of the reconfigurable robot arm. At the same time, the robust items are added in the control law in order to improve the compensation precision and anti-interference performance of the control law, and reduce the approximation error of the algorithm. By Lyapunov stability theory, it is proved that the proposed fuzzy adaptive control law and the robust fuzzy adaptive control law can …


Evasive Maneuvers Against Missiles For Unmanned Combat Aerial Vehicle In Autonomous Air Combat, Xizhong Yang, Jianliang Ai 2019 Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China;

Evasive Maneuvers Against Missiles For Unmanned Combat Aerial Vehicle In Autonomous Air Combat, Xizhong Yang, Jianliang Ai

Journal of System Simulation

Abstract: For UCAV having the capability to deal with autonomous air combat, the flight dynamics model with the overload input and the 3-dimensional proportional navigation guidance model were established. Based on artificial neural network, an evasive maneuver decision was presented for avoiding incoming missiles. The degrees of freedom for UCAV-missile system were reduced by coordinate transformation, which simplified the complicated model as a non-linear model with relatively small amount of input and a single output. After the neural network samples were generated and trained, evasive results could be directly predicted from the relationship of positions between UCAV and missile …


Evaluation On Pilot Performance Of Detecting Runway Incursion Based On Visual Simulation, Kun Yang, Xiangyu Ge, Pengfei Ju, Bai Jie 2019 Civil Aircraft Airworthiness Certification Technology and Management Research Center, Tianjin 300300, China;

Evaluation On Pilot Performance Of Detecting Runway Incursion Based On Visual Simulation, Kun Yang, Xiangyu Ge, Pengfei Ju, Bai Jie

Journal of System Simulation

Abstract: In order to evaluate the performance of pilots using HUD and PFD to detect runway incursion under approach and landing circumstances, a visual simulation system for transport category airplanes is designed by visual simulation technology. The system includes models of head up display (HUD), primary flight display (PFD), cockpit of transport category airplanes, 3-D terrain of airport. And a program is written to read flight joystick data to control flight. On this visual simulation system, performance experiment of pilots using HUD and PFD to detect runway incursion is carried out. Analysis results show that the response time of …


Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen 2019 School of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;

Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen

Journal of System Simulation

Abstract: Combined with the key link of the general cargo loading and unloading operations, the system simulation method is employed to analyze the production efficiency for the general cargo handling operation. The Plant Simulation software is used to design the main modules of the production process such as collection operation, vessel arrival, yard operation, horizontal transportation, ship-loading operation. The simulation model of general cargo handling operation is established based on the whole operation process. The simulation model is running based on the practical production data, and the efficiency of the crane, transitions time and the average storage period are analyzed. …


Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang 2019 1.College of Information System and Management, National University of Defense Technology, Changsha 410073, China; ;

Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang

Journal of System Simulation

Abstract: Since modern combats represent the development trend of systematization and network, it has become an essential requirement to build and use the equipment through a system-of-systems approach. The evaluation of contribution ratio to system-of-systems (CRSOS) is an important means to advance the development of weapon equipment systematization, and it is also urgently needed to carry out in-depth research on the theoretical concepts and methods. This paper establishes the research framework of CRSOS from the classification of contribution type and the equipment management life cycle. It proposes a CRSOS definition from the perspective of capability-efficiency dimension based on current …


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