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Articles 4621 - 4650 of 13783

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

Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao Aug 2020

Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao

Journal of System Simulation

Abstract: Vector field topology analysis is an important tool of feature-based visualization of vector fields. As a frontier research of flow field visualization, topology analysis extracts the topological structures as vector fields' features, helps uses filter important data, and reduce the occlusion and visual cluster. Based on mathematical definitions related to vector field topology analysis, different methods were introduced along with their advantages and shortcomings, and a knowledge system of vector field topology analysis was well-established. The applications and significance of topology analysis were explored to play a greater role, and the combination with other visualization techniques was discussed …

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3d Printing Orientation Optimization Based On Non-Dominated Sorting Genetic Algorithm, Dai Ning, Lisong Ou, Renkai Huang, Liu Hao Aug 2020

3d Printing Orientation Optimization Based On Non-Dominated Sorting Genetic Algorithm, Dai Ning, Lisong Ou, Renkai Huang, Liu Hao

Journal of System Simulation

Abstract: Part orientation is one of the key technologies in 3D Printing,which has important influence on the surface precision, machining time and machining cost of the part. This problem is a research hot point of how to balance the surface precision and machining time. The improved Non-dominated Sorting Genetic algorithm was proposed to solve the problem of part orientation optimization. The mathematical model of part surface accuracy and machining time were constructed. The chromosome model of part orientation and the adaptive crowding distance were established. The genetic operators of select, crossover and mutation were used to get a set of …

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Automatic Registration Method Based On Curvature, Wenli Yu, Mingquan Zhou, Wuyang Shui, Zhongke Wu Aug 2020

Automatic Registration Method Based On Curvature, Wenli Yu, Mingquan Zhou, Wuyang Shui, Zhongke Wu

Journal of System Simulation

Abstract: Due to the acquisition range constriction of three-dimensional, a scanner could only obtain a single perspective of the deep image achieving the 3-D modeling from researching the registration of deep image. Currently, most of the existing commercial software requires manual label to achieve the registration of deep image. In order to improve this problem, an automatic registration method based on the constriction of curvature was proposed. At the beginning of registration, the method 4-Points Congruent Sets for Robust Surface Registration (4PCS) was used to achieve the initial and automatic registration. In the phase of accurate registration, ICP and linear …

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Discontinuous Hierarchical Data Visualization Method Based On Themeriver Model, Yuangang Zhen, Chen Yi, Liu Ying, Ruijun Liu Aug 2020

Discontinuous Hierarchical Data Visualization Method Based On Themeriver Model, Yuangang Zhen, Chen Yi, Liu Ying, Ruijun Liu

Journal of System Simulation

Abstract: For traditional ThemeRiver model which has poor performance support to characteristics of discrete data, a kind of visualization method based on improved ThemeRiver model was put forward, which was applied to discontinuous data. All data was put into several time slots and was counted respectively, and new data was added in the time slot which lack data. Gaussian model was adopted to fit curve. After ordering layout, selecting themes' color and arranging the labels, a layout was proposed which has prediction function and can show the hierarchical characteristic. For the hierarchy, the same color family was used to …

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Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin Aug 2020

Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin

Journal of System Simulation

Abstract: Traditional method based on color image can recover the boundary of an object, but it can't recover the concave part. Although reconstruction based on depth image can revert the concave part, but the result has bad boundary which means that the edge information lost seriously. The method that fused the depth and RGB image was proposed to solve the individual shortcomings. Based on space subdivision the origin visual hull was computed based RGB image and depth image individually. In the following step, the two type visual hulls were combined for analyzing concave area and then fused into one. A …

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Visual Analysis Method For Comparison And Association Of Pesticide Residue Detection Data In Foods, Yuchao Feng, Chen Yi, Liu Ying, Hongqian Chen Aug 2020

Visual Analysis Method For Comparison And Association Of Pesticide Residue Detection Data In Foods, Yuchao Feng, Chen Yi, Liu Ying, Hongqian Chen

Journal of System Simulation

Abstract: On the basis of existing researches, after having studied on the national pesticide residue data, a visual analysis method and interactions were proposed to visualize the data from different aspects, which was called Visual Analysis method of Comparisons and Associations(VACA). This method abandoned the visualization method of visualizing association relationships by connecting lines, and used interactions to visualize the associations relationships between two types of hierarchical data, which could avoid the visual clutters. This method also could compare the attributes of two trees with the same structure, such as the pesticide detection in the products of different …

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Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou Aug 2020

Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou

Journal of System Simulation

Abstract: To visualize the status data of the procedure in real time, a visualization method supporting by the relating static model was proposed. The static models were built in the method. The processing status data were divided into some data segment matching to the static model. The dynamic model for each data segment was built based on the shape of the corresponding static model. Each part of the model was colorized or texturized based on its type or value. All the dynamic model and static model were linked and assembled due to its logical relation. The final visualization result …

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Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu Aug 2020

Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu

Journal of System Simulation

Abstract: Scene simulation technology has gained a vast range of application in many different fields, such as aerospace measurement and controlling, by displaying the mission process and flight status in 3D real-time graphics interactively, which provided a comprehensive and intuitive controlling platform. The lunar exploration has been implemented with unmanned lunar rovers to detect the environments of the moon. Tele-operation was adopted to control the whole process by making and sending detecting plan and programming to the rover, in which the position of the sun was the key constraint condition. An effective real-time soft shadow map algorithm was presented to …

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Radar Countermeasures Simulation Factor Analysis Method Of Fidelity-Oriented, Guoliang Wang, Huanyao Dai, Xujian Shen, Zhou Bo Aug 2020

Radar Countermeasures Simulation Factor Analysis Method Of Fidelity-Oriented, Guoliang Wang, Huanyao Dai, Xujian Shen, Zhou Bo

Journal of System Simulation

Abstract: It is crucial to assess the fidelity of operational objectives simulation and complex electromagnetic environment building for designing a military simulation system. Traditional confidence, credibility, similarity are difficult to fully evaluate the entire system, and hard to focus. To solve the problem of fidelity analysis and evaluation of operational objectives and battlefield simulation environment building, the concept and content of simulation fidelity were analyzed to explore the factor analysis principle and hierarchical classification method, etc., taking radar group network confrontation as an example, and its level division structure was given. General principles and methods of radar countermeasure high-fidelity simulation …

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Spherical Qtm-Based Submerged Simulation System Of Sea Level Rise, Huaqiao Xing, Miaole Hou, Wang Lei, Xiaoyi Jiang Aug 2020

Spherical Qtm-Based Submerged Simulation System Of Sea Level Rise, Huaqiao Xing, Miaole Hou, Wang Lei, Xiaoyi Jiang

Journal of System Simulation

Abstract: Focused on the dynamic simulation of submerged area after the rise of sea level, key technical issues were discussed, such as data organization and scheduling in large-scale 3D scene, submerged area dynamic simulation based on the adjacent relations of QTM (Quaternary Triangular Mesh) grids. A submerged simulation system based on QTM was designed and developed using Visual C#3.0 programing language and Microsoft DirectX 9 graphic interface, and the overall structure and main function of the system were introduced in detail. Tianjin Binhai New Area was selected as study area for submerged area dynamic simulation under different sea levels …

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A Class Of Prediction Based Adaptive Pid Controller, Yanjun Liu, Yawen Mao Aug 2020

A Class Of Prediction Based Adaptive Pid Controller, Yanjun Liu, Yawen Mao

Journal of System Simulation

Abstract: The PID controller has been widely used in various industrial processes. However, for real practical control plants, their mechanisms, structures and operation conditions are different, and conventional tuning methods cannot always work in a desirable state. In order to improve the robustness and the stability of the control systems, advanced PID control algorithms have been attracted much attention. A prediction based adaptive control algorithm is proposed for CARIMA models, where the PID parameters can be tuned adaptively according to the parameters of the control plant. The key is minimizing a performance index which considers the quadratic predicted output, over …

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Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao Aug 2020

Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao

Journal of System Simulation

Abstract: In order to realize high-accuracy measurement of nonlinear loads, an improved algorithm of harmonic energy measurement based on discrete wavelet packet decomposition and reconstruction was proposed. Frequency band and the corresponding number of decomposition layer were given according to the sampling number, window width and sampling frequency. To improve the non-ideal cut-off characteristic of wavelet filter and eliminate the frequency aliasing, the discrete Fourier and the inverse transformation were used to remove the extra frequency components. The calculation expression of harmonic power and the principle of harmonic energy measurement were listed. The simulation analysis of harmonic energy measurement …

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Insulation Optimization Of High Voltage Box Based On Finite Element Method, Fangcheng Lü, Jianqiao Ma, Hongyu Liu, Fochi Wang, Xie Jun, Buchao Jia, Yunxiang Guo, Li Min Aug 2020

Insulation Optimization Of High Voltage Box Based On Finite Element Method, Fangcheng Lü, Jianqiao Ma, Hongyu Liu, Fochi Wang, Xie Jun, Buchao Jia, Yunxiang Guo, Li Min

Journal of System Simulation

Abstract: The discharge between cable connector and box walls directly affects the operational reliability of CRH. Optimized design of the electric field distribution of the connector can improve stability of CRH. The sheath installation position, sheath structure and thickness of the insulation layer were analyzed to see its influence on the distribution of field intensity. The simulation results show that insulating jacket positioned at the high voltage end of cable connector can effectively improve the electric field distribution, insulation sheath should appress to the high voltage fitting end of the cable connector and also extend to the root of first …

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Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei Aug 2020

Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei

Journal of System Simulation

Abstract: Considering the negative effects of mesh distortion on calculation accuracy in FEM simulation, a novel mesh free method named Smoothed Particle Hydrodynamics (SPH) method was employed to simulate the process of single CBN abrasive grain cutting TC4. Establishing a SPH model of TC4 workpiece and a FEM model of single abrasive grain with cutting edges similar to the real abrasive grain, the influences of cutting depth on grinding forces and chip formative process were studied systematically. The simulation results state that grinding forces enlarge with the increase of cutting depth, while grinding force ratio decreases. And TC4 chip formative …

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Model Granularity Control Oriented Multi-Resolution Modeling, Huachao Mao, Gongzhuang Peng, Heming Zhang, Jiaxin Zhao, Minghui Li Aug 2020

Model Granularity Control Oriented Multi-Resolution Modeling, Huachao Mao, Gongzhuang Peng, Heming Zhang, Jiaxin Zhao, Minghui Li

Journal of System Simulation

Abstract: Multi-resolution modeling and simulation has been widely applied in various fields, but the current multi-resolution modeling and simulation methods cannot effectively, systematically and comprehensively address four key issues: resolution control, model consistency, information loss and cross resolution interaction. Addressing these four issues, Model Granularity Control Oriented Multi-Resolution Modeling was proposed. This modeling approach has two core modeling components: resolution state chart and resolution connecting bridge, the former is to use UML state diagram to control granularity changes triggered by cross-resolution interaction, human-computer interaction and resource optimization model, and the latter is to model the relationship between different resolution …

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Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi Aug 2020

Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi

Journal of System Simulation

Abstract: The limitation of the traditional communication model modeling methods was analyzed. On the basis of detailed analysis the requirements of communication modeling and simulation, the method of communication model modeling method was designed based on the communication effects. It shows how to represent communication asset and combines the input and output of the model with the simulation verification scenario to illustrate the validity and applicability of the communication model. This method can effectively solve the impact analysis of communication problem for operational effectiveness, saves development costs and supplies the reference method of C4ISR model in warfare modeling …

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Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping Aug 2020

Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping

Journal of System Simulation

Abstract: The fluid mechanics principle and the triangle harmonic function were used to establish a simple and high real-time typical strong wind-shear field model. The simulation data of wind field velocity in horizontal fan-shaped scanning mode and vertical scanning mode based on the parameter and detecting mode of airborne phase array weather radar was proposed. The different characteristics of strong wind shear detected by airborne weather radar on the different altitude were proposed through simulation data analysis. The simulation data credibility of strong wind shear field was analized based on weather radar velocity of a strong squall line process …

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Comparison Of Microscopic On-Road Fuel Consumption Model Based On Vsp And Ln (Tad), Zhao Qi, Yu Lei, Guohua Song Aug 2020

Comparison Of Microscopic On-Road Fuel Consumption Model Based On Vsp And Ln (Tad), Zhao Qi, Yu Lei, Guohua Song

Journal of System Simulation

Abstract: In microscopic on-road fuel consumption models, the power demand-based parameter was commonly used to characterize the vehicle activities because of its strong correlation with fuel consumption. Both VSP and the natural logarithm of Ln(TAD) were commonly used power demand-based parameters. It is necessary to compare the accuracy and characteristic of two fuel consumption models that are developed based on the VSP with Ln(TAD). By collecting and processing field vehicle activities and fuel consumption data, two fuel consumption models for LDVs, one based on the VSP and another one based on Ln(TAD) were developed. Then, the distribution model between …

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Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo Aug 2020

Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo

Journal of System Simulation

Abstract: Cooperation is the base of Computer Generated Forces team behaviors; formation and formation changing are the mostly used team cooperation of tank unit CGF. By combining cooperation planning with joint intention, a formation cooperation method for tank unit CGF was promoted. According to the knowledge levels of different CGF roles about the cooperation, the commander role CGF planed conditions and restraints of the formation cooperation, and the subordinated CGF autonomy planed to concretely implement the cooperation, which significantly enhanced the formation cooperation efficiency. The joint intention was established before the implementation of the cooperation, all CGF revised cooperation action …

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Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin Aug 2020

Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin

Journal of System Simulation

Abstract: The railway bulk oil transit operation is a hybrid (discrete/continuous) system because of the main body of the continuous flow oil and a variety of discrete events. According to the system’s characteristics of complex process, great difficulty, high risk, the oil transit operation model was established based on discrete rate simulation and system’s continuity, predict events, emergencies were analyzed. The model was converted into linear programming, the effective rate was calculated under constraints, and the operation process and event scheduling was simulated. It was verified that the model is feasible. By obtaining the dynamic behavior and real-time data, its …

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Motion Planning Algorithm Based On Overall Trajectory For Locomotion Of 6-Legged Robot, Zuhua Guo, Shenjiang Wang, Shijie Zhao Aug 2020

Motion Planning Algorithm Based On Overall Trajectory For Locomotion Of 6-Legged Robot, Zuhua Guo, Shenjiang Wang, Shijie Zhao

Journal of System Simulation

Abstract: A traditional motion planning method based on gaits is difficult to adopt to complicate nature terrain. In order to solve the problem, a planning algorithm based on overall trajectory was proposed. The basic unit of robot maneuver was a walking step. The proposed method was to estimate position of robot in the next moment along a given overall trajectory, and then to plan the joints’ trajectory of robot. In this algorithm, the motion of a single step was decomposed into two parts, the motion of moving robot body with support of legs and the motion of swinging legs forward, …

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Research On Network Emulation Method Based On Shared Library Integration, Mingqing Zhang, Leigang Sun, Hongshan Kong, Xianqing Qi Aug 2020

Research On Network Emulation Method Based On Shared Library Integration, Mingqing Zhang, Leigang Sun, Hongshan Kong, Xianqing Qi

Journal of System Simulation

Abstract: For the high-risk, high-cost to test equipments in real network and the poor accuracy of software simulation, network emulation method was introduced; the integration between real application and simulation system is the key technology. According to the mapping principle between real device and virtual network, a network emulation model framework was proposed; the OMNeT++ simulator on the source code lever was designed; the network emulation method based on shared library integration was proposed; the problems of thread error, time distortion and symbolic space in the process of integration were discussed, and corresponding solutions were given; the correctness …

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3-Dimensional Kinematics Simulation Of Gear Hobbing, Rongchuang Zhang, Wang Jun, Wang Bo, Wanshan Wang Aug 2020

3-Dimensional Kinematics Simulation Of Gear Hobbing, Rongchuang Zhang, Wang Jun, Wang Bo, Wanshan Wang

Journal of System Simulation

Abstract: To save inevitable modeling insufficiencies owing to the simplified modeling strategie, 3-dimensional kinematics simulation of gear hobbing based on solid modeling was developed. On the basis of the kinematic relationship and positional relationships between the hob cutter and work piece, the vector model of the gear hobbing motion based time-driven was put forward. Based on UG Secondary Development, geometrical model of hob tooth rake face and curvilinear model of hob tooth path were developed, and the swept geometric entity of the hob tooth was developed through the use of the combination of these two models. The intersection of …

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Probability Hypothesis Density Filter Based On Adaptive Target Birth Intensity, Jingjing Wu, Lihua You, Wang Yao, Shujuan Song Aug 2020

Probability Hypothesis Density Filter Based On Adaptive Target Birth Intensity, Jingjing Wu, Lihua You, Wang Yao, Shujuan Song

Journal of System Simulation

Abstract: For probability hypothesis density (PHD) filter, that was not able to track birth targets of unknown position, PHD filter with adaptive target birth intensity was proposed. The track initiation algorithm was employed to detect positions of promising birth targets which were used to form the intensity function of birth targets, and an online estimation algorithm of spontaneous birth intensity was proposed. Adaptive target birth intensity was combined with the recursion of the PHD filter, and a solution to the PHD filter based on adaptive target birth intensity for linear Gaussian target dynamics was proposed. Simulation results demonstrate that …

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Adjacent Bit Xor Operation Based Test Data Compression Method, Yifei Cheng, Wenfa Zhan Aug 2020

Adjacent Bit Xor Operation Based Test Data Compression Method, Yifei Cheng, Wenfa Zhan

Journal of System Simulation

Abstract: Data compression is a very effective method to reduce the test cost. An adjacent bit XOR operation based test data compression method was proposed based on bitwise XOR operation between itself and its previous bit, which turned continuous series, such as a series of all 0s and all 1s into series of all 0s, and reversal series, such as a series of 01 and 10 into series of all 1s by bitwise XOR operation between adjacent bits. On one hand, the two kinds of series, continuous series and reversal series, were both taken into account, which decreased the number …

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Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji Aug 2020

Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji

Journal of System Simulation

Abstract: A method based on the gray theory and identification model was proposed to predict the short-term wind power generation. GM(2,1) model was applied for establishing a wind speed prediction model with an iterative step. After the wind speed prediction procedure, a finite impulse response moving average nonlinear Hammerstein model was used in the modeling between wind speed and wind power generation. By adopting the stochastic gradient searching theory, a wind power generation forecasting algorithm was proposed. The proposed simulation shows that the presented method can forecast the real time power generation of wind turbine and raise the accuracy of …

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Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang Aug 2020

Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang

Journal of System Simulation

Abstract: Coping with the distributed and complex threaten of networking attack, the requirement of coordinated defense of Firewall and IDS/IPS are becoming more and more urgent. As the existence of uncertainty of the judgment of Intrusion performed by IDS/IPS, Firewall and IDS/IPS often perform contradict action, that the same package matched the both rules of Firewall and IDS/IPS, and conflict arose, which would lead to illegal access control or deny of legal access control. The policies conflict detection algorithm of coordinated defense of Firewall and IDS/IPS were researched. The semantic models of firewall policy and IDS/IPS policy were proposed, the …

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High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang Aug 2020

High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang

Journal of System Simulation

Abstract: In the docking phase of orbit control task of space rendezvous and docking, smooth without overshoot, good robustness and fuel-saving control are required. To this end, a transient process for orbit control was proposed, and new controllers were designed on the basis of the transient process for the space rendezvous and docking. The ultimate goal was refined to the gradual arrival goal to build the transient process between the initial coordinate and the target coordinate of the system. The output of the transient process was designed as a smooth S-type curve. Three different orbit controllers of space rendezvous and …

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Study Of Setting Up Simulation Platform Of Self-Adaptive Flight Control System With Self-Repair Function, Long Hao, Shujie Song Aug 2020

Study Of Setting Up Simulation Platform Of Self-Adaptive Flight Control System With Self-Repair Function, Long Hao, Shujie Song

Journal of System Simulation

Abstract: The frame and characteristic of self-adaptive flight control system with self-repair function for aircraft with thrust vector were studied. RHO optimal algorithm was used to realize online controller design. MSLS algorithm was used to realize online flight identify parameters. Global parity space method, sensor data fusion and probability theory were used to realize FDI algorithm. The simulation platform used to simulate self-repair function with aircraft control surface failure was developed using OOP language VC++6.0 and three-dimensional graphics language OpenGL. Simulations show that the control surface and flight aerodynamic parameter change with flying states in the flight movement …

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Uav Takeoff Decision Based On Neural Network Model Of Takeoff Capability, Yongtao Peng, Yueping Wang, Xiaoting Wang Aug 2020

Uav Takeoff Decision Based On Neural Network Model Of Takeoff Capability, Yongtao Peng, Yueping Wang, Xiaoting Wang

Journal of System Simulation

Abstract: To enhance the safety in case of engine flameout failure, a new type of UAV takeoff decision based on neural network capacity model was proposed. Two capacity parameters of takeoff safety in case of engine flameout failure were defined, one is the maximum velocity for a safe takeoff and the other is the minimum velocity for a safe shut down. A calculation method based on iterative simulations for those parameters under multiple flight conditions was introduced. Double layer neural networks were used to model the relationship between flight conditions and the capacity parameters, to realize the compressive storage and …

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