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2020

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Articles 1201 - 1230 of 1941

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Modeling And Simulation Of Magnetostrictive Impact Drive Mechanism, Zhao Ran, Quanguo Lu Jun 2020

Modeling And Simulation Of Magnetostrictive Impact Drive Mechanism, Zhao Ran, Quanguo Lu

Journal of System Simulation

Abstract: A model of magnetostrictive impact drive mechanism (IDM) was built to predict the step size and velocity, in which the dynamical model and the second order non-linear model of magnetostrictive material based on Jiles-Atherton model were considered. The simulation model was developed by utilizing MATLAB /Simulink software, and the data of IDM's displacement and velocity was obtained based on the model. The experimental system was built to testify the given model. The results illustrate that the error between experiment and simulation results are less than 15% within the range of driving current 0.2~0.4A and working frequency 10~100Hz. The …

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Simulation And Analysis On Coupled Vibration Of Fracturing Truck Process, Chuan Wang, Zhenqiang Xie, Guorong Wang, Shimin Zhang, Hou Wen, Li Jun, Zhou Xu, Chu Fei Jun 2020

Simulation And Analysis On Coupled Vibration Of Fracturing Truck Process, Chuan Wang, Zhenqiang Xie, Guorong Wang, Shimin Zhang, Hou Wen, Li Jun, Zhou Xu, Chu Fei

Journal of System Simulation

Abstract: In order to study the effect of vibration of engine and fracturing pump on truck body during fracturing operation, lumped parameter method and state space method were used to build multi-body dynamics coupling model between the balanced suspension, tires, engine, fracturing pump and the frame. Based on this model, the MATLAB/Simulink software was applied to simulate the characteristic of rotational speed, stiffness and damping of the 2 500 fracturing truck during fracturing operation. The results show that the maximum intensity of vertical vibration is stronger hundreds times than pitch motion. Vibration frequency range of 0~10 Hz …

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Multipurpose Image Watermarking Algorithm For Progressive Transmission, Jianqiu Jin, Bangqing Cao, Wang Xun, Haiyan Wu, Bailing Yang Jun 2020

Multipurpose Image Watermarking Algorithm For Progressive Transmission, Jianqiu Jin, Bangqing Cao, Wang Xun, Haiyan Wu, Bailing Yang

Journal of System Simulation

Abstract: Multipurpose watermarking, which has the property of both robust and semi-fragile watermarking, can realize two or more purposes in one algorithm, e.g. copyright protection and content authentication usually. It can be classified into multi-segment and single-segment watermark embedding. The latter is better in invisibility, but more challenging than the former. A multi-purpose image watermarking algorithm with single-segment watermark embedding for progressive transmission was proposed. It embedded a watermark abstracted from original image into middle and low-frequency coefficients of block DCT transform. In the watermark embedding process, the intensity of watermark could be dynamically adjusted according to the local texture …

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Carrier Disposition Pwm Control With No Dead Zone For Tnpc Inverter, Wenjuan Li, Feng Jie, Wang Chao Jun 2020

Carrier Disposition Pwm Control With No Dead Zone For Tnpc Inverter, Wenjuan Li, Feng Jie, Wang Chao

Journal of System Simulation

Abstract: After the addition of dead zone, the carrier disposition PWM modulation method could have some problems, such as distortion of current waveform and decreasing of voltage utilization ratio. Taking the TNPC type three-level inverter as a researching object, a novel method of the carrier disposition PWM modulation with no dead zone for three-level inverter was proposed, in which three PWM modulation signals were generated by using triple carrier wave. By analyzing the effect caused by the dead zone in different operating states, on and off rules of power switches were derived. Simulation results in MATLAB/Simulink environment show that the …

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Parameters Optimization For Variable Speed And Pitch Controller Of Wind Turbine Based On Bladed, Gao Feng, Wang Wei, Xinmei Ling Jun 2020

Parameters Optimization For Variable Speed And Pitch Controller Of Wind Turbine Based On Bladed, Gao Feng, Wang Wei, Xinmei Ling

Journal of System Simulation

Abstract: Due to nonlinearity and time-varying parameters of wind power system, its controller parameters are hard to be calculated and tuned during the process of design and optimization. The linear model which is suitable for parameters tuning was built through model linearization of Bladed and model reducing-order algorithm. The PI parameter was tuned with the IM-PSO (Immune Memory Particle Swarm Optimization). Moreover, the gain coefficient of optimal torque control and the gain divisor of adaptive PI pitch control conducted optimizing calculation based on the identification parameters of Bladed. A set of optimization method for variable speed and pitch controller …

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Decoupling Control Of Poultry Hatching Process Based On Α-Order Neural Network Inverse System, Guoxiong Zhou, Junchao Li, Aibin Chen Jun 2020

Decoupling Control Of Poultry Hatching Process Based On Α-Order Neural Network Inverse System, Guoxiong Zhou, Junchao Li, Aibin Chen

Journal of System Simulation

Abstract: The poultry hatching process is a complex biological process, in which coupling between temperature, humidity and oxygen concentration is serious, and conventional control methods can not guarantee the stability of three parameters. An α-order inverse system decoupling control method for poultry hatching process was proposed. The three factors were grouped by coupling degree analysis, using α-order neural network inverse system to control the two parameters whose coupling degree is stronger, another parameter would be controlled by fuzzy controller, thus ensuring the stability of the three parameters. The experimental results show the effectiveness of this method.

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Performance Evaluation Of Automated Warehouse Based On Markov Chain, Xiangguo Ma, Tongjuan Liu, Wang Li, Rongfen Jiang Jun 2020

Performance Evaluation Of Automated Warehouse Based On Markov Chain, Xiangguo Ma, Tongjuan Liu, Wang Li, Rongfen Jiang

Journal of System Simulation

Abstract: It is necessary that the way of evaluating the AS/RS is scientific and feasible. However the majority of existing evaluate methods is static and qualitative, whose analysis results deviation, to a certain extent, from the real data. To support the improvement of the AS/RS use, the performance of AS/RS with a dynamic and quantitative method was analyzed. Specifically, the automated stereoscopic warehouse performance evaluation indicators were established; by using Marco analysis, the mathematical model of performance evaluation was got; based on ARENA software, the feasibility and validity of the mathematical solution model were verified.

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Dynamics Analysis Of Flue Gas Compression System In Oxy-Coal Fired Boiler, Jianqiang Gao, Zhang Chen Jun 2020

Dynamics Analysis Of Flue Gas Compression System In Oxy-Coal Fired Boiler, Jianqiang Gao, Zhang Chen

Journal of System Simulation

Abstract: Taking the flue gas compression system in a 300MW oxy-coal fired boiler unit as an object of study by concept design, math model of gas compressor and gas cooler were established with the method of lumped parameter, and dynamic simulation of flue gas compression system was developed. The disturbance experiments on coal-feeder speed and flue gas compressor speed, etc. were carried out based on B-MCR stable condition. As a result, the operating parameters of gas compressor have a more sensitive response and larger change magnitude when the perturbation of coal feeder speed and gas compressor speed is disturbed; when …

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Simulation And Verification For Low Altitude Ground Reflection Characteristics Of Low-Frequency Broadband Signal, Zhannan Ma, Feifei Du, Jinxi Chen Jun 2020

Simulation And Verification For Low Altitude Ground Reflection Characteristics Of Low-Frequency Broadband Signal, Zhannan Ma, Feifei Du, Jinxi Chen

Journal of System Simulation

Abstract: Low frequency broadband signals have advantages in improving radar target recognition ability. To determine the ground reflectance of broadband signal at low altitude, the ground reflectance of different frequency points of narrowband is used to compose the equivalent ground reflectance of broadband signal based on ground reflection model. The relationship between ground reflectance and ground characteristics (relative dielectric constant, conductivity), grazing angle, and polarization characteristics were discussed in detail. The reflectance in typical environment was verified using the method of antenna pattern test at low altitude. Results show that the reflectance simulation model was effective, and the model provides …

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Adaptive Mutative Scale Chaos Particles Swarm Optimization Based On Logistic Mapping, Yanyang Zeng, Yunxia Feng, Wentao Zhao Jun 2020

Adaptive Mutative Scale Chaos Particles Swarm Optimization Based On Logistic Mapping, Yanyang Zeng, Yunxia Feng, Wentao Zhao

Journal of System Simulation

Abstract: To overcome the shortcomings of Particle Swarm Optimization (PSO), an Adaptive Mutative Scale Chaos Particles Swarm Optimization (ACPSO) based on Logistic Mapping was proposed. The chaos method was used to initialize the particles. The adjustment method of the inertia weight depended on the particle's fitness; it could avoid premature convergence for the particles. When the particles fell into the local optimum, mutative scale chaos optimization strategy was adopted to adjust the optimal particles. To test the effectiveness of the algorithm, three representative algorithms were compared with. The results show that the algorithm has high convergence speed and high precision.

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Novel Distance Measure Between Intuitionistic Fuzzy Sets, Luo Xiao, Weimin Li Jun 2020

Novel Distance Measure Between Intuitionistic Fuzzy Sets, Luo Xiao, Weimin Li

Journal of System Simulation

Abstract: Distance measure is a basic and crucial notion of set theory. Since the intuitionistic fuzzy sets (IFSs) were put forward, distance between IFSs has been widely concerned by some researchers and many types of measures have been proposed. Most of them have counter-intuitive cases and ignore the characteristics of three parameter properties of IFSs. The concept of fuzzy distance was introduced, which embodied the characteristics of classical distance and highlights the characteristics of hesitance index simultaneously. A new fuzzy distance measure was proposed, and the corresponding proof was included. An artificial benchmark test set of distance measure was constructed …

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Visualization Of Multi-Dimensional Effectiveness Indicator Of Weapon System Of Systemsbased On Fusion Manifold Learning, Jianfei Ding, Guangya Si, Yafeng Shi, Liu Yi Jun 2020

Visualization Of Multi-Dimensional Effectiveness Indicator Of Weapon System Of Systemsbased On Fusion Manifold Learning, Jianfei Ding, Guangya Si, Yafeng Shi, Liu Yi

Journal of System Simulation

Abstract: It is an important way to compare the comprehensive characteristics of weapon system of systems (WSoS) by means of visualization method to display the various effectiveness indicators information of WSoS construction planning scheme in simulation test. A visualization method for multi-dimensional effectiveness indicator was proposed based on fusion manifold learning. The indicator items and scheme items were converged from high-dimensional space to the same two-dimensional space. The density calculation was used to calculate the effect degree between the multidimensional indicator and scheme. The final multidimensional indicator visualization effect was achieved by radiological calculation. Two sets of experiments were …

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Model-Based Design And Simulation For An Aircraft Flight Control System, Chi Yue, Shan Dong, Zhenxin Yan, Hei Peng Jun 2020

Model-Based Design And Simulation For An Aircraft Flight Control System, Chi Yue, Shan Dong, Zhenxin Yan, Hei Peng

Journal of System Simulation

Abstract: The process and method of model-based system engineering (MBSE) and its implementation in highly complex flight control system were clearly introduced. By comparing with traditional design methods, MBSE applied models as baseline instead of documents to handle the complexity of modern systems. The top-down workflow is more capable of ensuring coherence of design process, completeness of requirements verification and system testability. With the simulation of system model, the integrality of design and verification process, system function behavior simulation, implementation of the failure mode, effect analysis (FMEA) and the decreasing of system risk grade are well achieved.

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Construction Method Of Reconnaissance Assistant Decision Model, Guo Rui, Xiaoyuan He, Zhu Feng Jun 2020

Construction Method Of Reconnaissance Assistant Decision Model, Guo Rui, Xiaoyuan He, Zhu Feng

Journal of System Simulation

Abstract: The fog of war in modern battlefield information big data generated by the judgment of the battlefield commander had a strong interference, which could increase the difficulty of decision-making. The use of reconnaissance and early warning forces is the beginning of mastering the initiative of the battlefield. Intelligent auxiliary investigation command is to achieve this goal. On the basis of the simulation system field data of a certain operations, through extracting the key information of reconnaissance order, combined with establishing the labels of reconnaissance effect, an auxiliary decision model aimed at reconnaissance and early warning is designed. This model …

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Complexity Analysis Of Joint Operational Network Information System, Peng Jun, Mingzhi Zhang Jun 2020

Complexity Analysis Of Joint Operational Network Information System, Peng Jun, Mingzhi Zhang

Journal of System Simulation

Abstract: Based on the theory of complex networks, the structure and characteristics of joint operational network information system (JONIS) were analyzed from the perspectives of heterogeneous directional weighted network topology, strong degree and its centralities. It is found that the combat network based on JONIS has characteristics of small-world and scale-free, with a large average weighted aggregation coefficient and a small average weighted path length, showing a similar power-law distribution. In the example network, command centers, satellites, support force, and early warning unit all have larger strong degrees and centralities. These platforms as the center of gravity and fragile nodes …

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Virtual Flight Modeling And Simulation Of Air-Launched Anti-Ship Missile, Zhipeng Sun, Guanghong Gong Jun 2020

Virtual Flight Modeling And Simulation Of Air-Launched Anti-Ship Missile, Zhipeng Sun, Guanghong Gong

Journal of System Simulation

Abstract: The relationship between the parameters affecting aerodynamic force was studied, and the aerodynamic coefficient was properly linearly simplified. According to the type of airborne anti-ship missile performance model, the "black box modeling" and extrapolation method was adopted to determine its aerodynamic coefficient, a typical anti-ship missile six degrees of freedom of the simplified dynamic model was established. By studying the flight phases after the missile launch, the flight trajectory model of each flight phase was established by using the control method of the track angle. The whole flight trajectory process of the missile attacking a target was realized and …

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Implementation And Application Of Complex System Modeling And Simulation Language Compiler, Zhou Wen, Chi Peng, Bohu Li, Song Xiao Jun 2020

Implementation And Application Of Complex System Modeling And Simulation Language Compiler, Zhou Wen, Chi Peng, Bohu Li, Song Xiao

Journal of System Simulation

Abstract: Simulation language is a key technology of integrated simulation based design software environment. A difficulty of developing simulation language is the compiler that automatically transfers simulation language Semantics to programming language such as C++. The contents and features of CMSL were introduced. And a compiler which could analyze simulation text written in CMSL was implemented. A decouple method for Discrete System was proposed and integrated in the compiler. The features object-oriented and components oriented of CMSL were verified by an example with its ability to describe discrete system.

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Research On Visual Objective Test Method Of High-Level Flight Simulator, Zhangfa Liu, Huiyong Li Jun 2020

Research On Visual Objective Test Method Of High-Level Flight Simulator, Zhangfa Liu, Huiyong Li

Journal of System Simulation

Abstract: With the development of commercial aircraft, the demand of high-level flight simulator will increase. In addition to development and production, qualification test is a key link to ensuring the quality of simulator. Visual system plays an important role of flight simulator. In order to meet the requirement of qualification from CAAC, visual objective test based on main qualification test guide of flight simulator was developed. It is very significant that test requirements, test theory and test methods of visual objective test item were researched deeply, including transport delay, field of view, system geometry, surface contrast, brightness, surface resolution, light …

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Modeling And Dynamic Research Based On Ritz Series For Ball Screw Drive System, Rongrong Qian, Minzhou Luo, Jianghai Zhao, Li Tao, Li Lu Jun 2020

Modeling And Dynamic Research Based On Ritz Series For Ball Screw Drive System, Rongrong Qian, Minzhou Luo, Jianghai Zhao, Li Tao, Li Lu

Journal of System Simulation

Abstract: To analyze the vibration performance of the ball screw drive system, the finite element model (FEM) of the simplified system by Ansys/Workbench was given to acquire the vibration mode and shape. Based on the vibration shape calculated from FEM, a set of hybrid basis function was used to generate the new Ritz series for building the system motion equation of the axial and torsional vibration. The pitch of the ball screw was considered in the method. A mathematical model which was easy to design the controller was developed. Through the numerical simulation, the modal characteristics and shape of …

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Thermal And Electric Load Coupling Analysis And Decoupling Coordinated Control In Heat Supply Units, Tuoyu Deng, Tian Liang, Jizhen Liu Jun 2020

Thermal And Electric Load Coupling Analysis And Decoupling Coordinated Control In Heat Supply Units, Tuoyu Deng, Tian Liang, Jizhen Liu

Journal of System Simulation

Abstract: Due to large scale wind power integration, heat supply units hardly meet the AGC (automatic generation control) requirement by the existed coordinated control system. It is necessary to analyze coupling characteristics of thermal and electric load thoroughly. A transfer function matrix including characteristics of heat supply part was gained by small deviation linearization of a dynamic unit's model. Coupling characteristics was analyzed based on variable pairings of the existed coordinated control system and decouplers were designed. Relative gain matrix measure and simulation were used to compare the coupling extent before and after decoupling. Simulation experiments show that adding static …

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Attention Mechanism In Battlefield Situation Awareness, Yisi Kong, Xiaofeng Hu, Zhu Feng, Jiuyang Tao Jun 2020

Attention Mechanism In Battlefield Situation Awareness, Yisi Kong, Xiaofeng Hu, Zhu Feng, Jiuyang Tao

Journal of System Simulation

Abstract: Battlefield situation awareness (BSA) is the basis of C2 and decision making. Research on BSA can clarify the mechanism and lay the foundation for designing intelligent model and algorithm to assist commanders with situation awareness. Taking attention mechanism as the point, the relevant discussion in psychology was summarized, a framework of the attention mechanism in BSA was put forth, and its application in operational target value assessment was explored.

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Target Combination Selection Optimization Method Of Joint Operations Based On Fuzzy Genetic Algorithm, Suike Li, Jianhua Xiang, Haijun Wang, Mingzhi Zhang, Li Yi Jun 2020

Target Combination Selection Optimization Method Of Joint Operations Based On Fuzzy Genetic Algorithm, Suike Li, Jianhua Xiang, Haijun Wang, Mingzhi Zhang, Li Yi

Journal of System Simulation

Abstract: Under the condition of informatization, it is necessary to use intelligent model and optimization method to realize the cooperation and fusion of multi arms combat firepower. Aiming at the problem of target decision-making and firepower allocation in joint operations, the fuzzy multi-objective programming model was constructed to achieve the overall goal of achieving the maximum and the best firepower as a dual goal. In the model solving algorithm, the possibility theory was used to transform the fuzzy number, the model was transformed into the multi-objective programming model in the deterministic form. In order to improve the efficiency of …

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Motion Reconstruction And Simulation Using Sparse Inertial Sensors, Lijun Cui, Tianyu Huang, Feng Feng, Zhang Jie, Yang Kai, Liu Dong Jun 2020

Motion Reconstruction And Simulation Using Sparse Inertial Sensors, Lijun Cui, Tianyu Huang, Feng Feng, Zhang Jie, Yang Kai, Liu Dong

Journal of System Simulation

Abstract: A method was proposed to reconstruct high-dimensional full-body motion sequences from low-dimensional control data collected by sparse inertial sensors. The approach solved the mapping problem from low dimension to high dimension. A numerical similarity- geometrical similarity-time continuity model was setup to ensure the reconstructed motion candidates in numerical-logical similarity. The gap between angle and angular acceleration was eliminated by acceleration reconstruction. An energy function was introduced to optimize the reconstructed results which guaranteed the accuracy. The analysis and comparison experiments show that the proposed method can reconstruct nature and credible motions in real-time and can be applied …

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Artillery Company Firepower Assignment Model And Algorithm, Xuezhi Lü, Lisheng Chang, Xianwen Wang, Xinhui Zhao Jun 2020

Artillery Company Firepower Assignment Model And Algorithm, Xuezhi Lü, Lisheng Chang, Xianwen Wang, Xinhui Zhao

Journal of System Simulation

Abstract: In view of deficiency of traditional firepower assignment method and characteristics of modern artillery, the model and algorithm of firepower assignment of artillery company were studied. The firepower assignment problem of artillery company was described, and the resolving concept was discussed. Three firepower assignment modes based on resolving concept were introduced. The idea of getting optimal solution of firepower assignment with Monte Carlo simulation and golden section search were analyzed. The model and algorithm were validated with an example.

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Business Process Modeling Algorithm Based On Ontology Language, Huang Ying, Kangshun Li, Li Wei, Keqing He Jun 2020

Business Process Modeling Algorithm Based On Ontology Language, Huang Ying, Kangshun Li, Li Wei, Keqing He

Journal of System Simulation

Abstract: In the view of problem in lack of information sharing mechanisms at the semantic level among processes, a business process modeling algorithm based on ontology language using concept hierarchy as background knowledge was proposed. The business process modeling by traditional business process languages can be transferred to ontology language (OWL) description so as to realize the semantic sharing of business process. The approach has two main advantages compared with traditional methods: (1) accelerating the building process, minimizing the conversion cost; (2) background knowledge guides the extraction of knowledge resided in database. As a way of validating the approach, part …

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Travel Time Prediction Of Urban Road Based On Deep Learning, Weiwei Zhang, Ruimin Li, Zhongjiao Xie Jun 2020

Travel Time Prediction Of Urban Road Based On Deep Learning, Weiwei Zhang, Ruimin Li, Zhongjiao Xie

Journal of System Simulation

Abstract: Travel time prediction of urban road is a significant support for urban intelligent transportation system. Four types of LSTM neural network architecture were selected to predict the urban road travel time. The number of nodes in the LSTM hidden layer was fixed to determine the optimal input length of the model. The input length of the model was fixed and the predictive performance of the four LSTM models under different hidden layer nodes and considering spatial correlation were tested respectively. The performance of spatial LSTM model was compared with four traditional models, for example, BP neural network. The results …

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Measurement Error Correction Model Of Tof Depth Camera, Le Wang, Luo Yu, Haikuan Wang, Minru Fei Jun 2020

Measurement Error Correction Model Of Tof Depth Camera, Le Wang, Luo Yu, Haikuan Wang, Minru Fei

Journal of System Simulation

Abstract: 3D data intuitively reflects the full view of the target or scene. Time of Flight (ToF) camera is a range imaging sensor that can provide 3D geometric information of targets immediately, thus it is widely applied in the robot positioning and navigation, 3D reconstruction and other aspects etc. Due to the operational principle of the camera itself, there are variety measurement errors of the source data obtained by ToF, resulting in image distortion. The measurement errors in the imaging process of ToF camera were analyzed and summarized, and the cubic spline interpolation method combined with look-up table was proposed …

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Doa Estimation Method Of Uniform Circular Array Based On Improved Smoothed L0 Norm, Wang Biao, Chen Feng, Lu Li Jun 2020

Doa Estimation Method Of Uniform Circular Array Based On Improved Smoothed L0 Norm, Wang Biao, Chen Feng, Lu Li

Journal of System Simulation

Abstract: To solve the problems of the narrow-band signal DOA method, such as low resolution and unsuitable for applications with small number of snapshot and array elements, etc, DOA of uniform circular array based on improved smoothed l0 norm was proposed after analysis of the characteristics of UCA model and signal airspace sparse, combining with improved the smooth l0 norm algorithm. For reconstructing the signal, the method used the combined continuous function as the approximation to l0 norm by sparse matrix processing array manifold, which improved the convergence speed. It was also extended to the UCA DOA …

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Image Retrieval Using Weighted Vocabulary Tree With Location Information, Chen Ying, Jiayu Guo Jun 2020

Image Retrieval Using Weighted Vocabulary Tree With Location Information, Chen Ying, Jiayu Guo

Journal of System Simulation

Abstract: Aiming at the positional information ignorance problem in image retrieval based on SIFT feature matching, an image retrieval approach using weighted vocabulary tree based on the spatial location information was proposed. The vocabulary tree is used in the method to quantify SIFT features as the visual words, converting the image match into the visual words' weight vector match. Because only visual words' weight match ignored the mutual position effect, SIFT points' spatial location information was generated, and was classified into the position effect of visual words according to affiliation between SIFT points and visual words. The spatial location information …

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Best Viewpoint Selection For 3d Visualization Using Particle Swarm Optimization, Panpan Jia, Yanyang Zeng, Yunxia Feng Jun 2020

Best Viewpoint Selection For 3d Visualization Using Particle Swarm Optimization, Panpan Jia, Yanyang Zeng, Yunxia Feng

Journal of System Simulation

Abstract: The viewpoint selection is to automatically select one or more approximate optimal viewpoints in the viewpoints of multiple views, at the same time, it is related to the evaluation of the quality of the viewpoint. 3D visualization best viewpoint selection method based on particle swarm optimization algorithm was proposed. The viewpoint quality was evaluated by using the image information entropy and the image edge entropy, and the viewpoint was selected by the multi-objective intelligent optimization method. The basic flow begins with the initial viewpoint set, finding the best viewpoint by means of coding, particle evaluation, and particle update, which …

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