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2020

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Articles 391 - 420 of 1941

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

Simulation And Analysis Of Airborne Phase Array Weather Radar Reflectivity, Wang Lei, Chaopeng Yu, Liu Ping Aug 2020

Simulation And Analysis Of Airborne Phase Array Weather Radar Reflectivity, Wang Lei, Chaopeng Yu, Liu Ping

Journal of System Simulation

Abstract: The relation between radar parameters such as radar gain, beam width and impulse width and radar reflectivity based on the parameters of airborne phase array weather radar at X-band were proposed. Combined with weather radar equation correction and flight parameters, horizontal sector scanning and vertical sector scanning reflectivity data of airborne phased array weather radar were simulated based on new generation weather radar (CINRAD/SA) reflectivity. The results show that along the radial direction, the distance resolution of airborne phase array radar used impulse compress technology is higher than new generation weather radar and along the shear direction, because antenna …

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Segmentation And Recognition Of Hand-Drawn Situation Maps, Deng Wei, Lingda Wu, Yougen Zhang, Yang Chao Aug 2020

Segmentation And Recognition Of Hand-Drawn Situation Maps, Deng Wei, Lingda Wu, Yougen Zhang, Yang Chao

Journal of System Simulation

Abstract: Most of current research on online sketched military symbol recognition concerns the isolated samples. In pen-based situation marking systems, users prefer segmenting and recognizing the full sketched situation maps. However, it is a more difficult problem. The characteristics of hand-drawn situation maps and difficulties to segment them were analyzed, and a dynamic programming-based approach was proposed. A hand-drawn situation map was segmented coarsely by minimum spanning tree-based stroke clustering. The candidate segmentation path was evaluated by synthesizing geometric analysis and isolated symbol classifier together, using confidence transformation and fusion. The dynamic programming algorithm was used to search the …

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Robust Steerable Frequency Invariant Beamformer Design Based On Srv-Cls, Suting Chen, Zhang Wei Aug 2020

Robust Steerable Frequency Invariant Beamformer Design Based On Srv-Cls, Suting Chen, Zhang Wei

Journal of System Simulation

Abstract: The frequency invariant beamformer (FIB) has important applications in wideband array signal processing. Conventional FIB design approaches are usually proposed without considering the mismatches in microphone array characteristic, which leads to the performance of the FIBs degrading in practical applications. Therefore, a robust steerable frequency invariant beamformer design approach based on spatial response variation constrained least squares (SRV-CLS) was proposed. It combined the SRV-CLS FIB design approach with classical robust beamforming algorithm, and added the microphone characteristics as robust favor in the cost function. The proposed approach could work well in the presence of microphone mismatches, ensured the frequency …

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Study Of Synchronization For Fractional-Order Hyperchaotic System And Its Application In Secure Communication, Xue Wei, Jinkang Xu, Hongyan Jia Aug 2020

Study Of Synchronization For Fractional-Order Hyperchaotic System And Its Application In Secure Communication, Xue Wei, Jinkang Xu, Hongyan Jia

Journal of System Simulation

Abstract: A unidirectionally coupled synchronization method was adopted to design and implement the synchronization for the reported commensurate fractional-order hyperchaotic system, and its correctness and effectiveness were analyzed in theory. Moreover, taking an example of 3.6-order hyperchaotic system, analog circuits were designed to implement the fractional-order hyperchaotic system and its unidirectionally coupled synchronization with the frequency-domain approximation method based on Bode diagram. By conducting the circuit implementation, it is found that the results of the circuit implementation are in good agreement with those of the numerical simulation, which demonstrates the feasibility of the synchronization. On this basis, a secure communication …

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Review Of 3d Flow Visualization, Hange Song, Shiguang Liu Aug 2020

Review Of 3d Flow Visualization, Hange Song, Shiguang Liu

Journal of System Simulation

Abstract: 3D flow visualization describes the complex flow structure by computer graphics methods, reveals the internal laws and physical characteristics of the fluid, and has an important role in the aviation, atmosphere, and medicine and so on. There are many problems to be solved in the 3D flow visualization because of the dimension and the data scale of the 3D space. The classification of the 3D flow visualization was showed by the research status and methods, which could be divided the line-based visualization, surface-based visualization, volume rendering and texture-based visualization. The progress and problems in the above aspects were …

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Fast Implementation Of Virtual Prototyping Modeling Based On Assembly Model, Wang Yu, Shouwen Yao, Jilin Liu, Dezhi Huang, Qinghua Zhang, Yi Ran Aug 2020

Fast Implementation Of Virtual Prototyping Modeling Based On Assembly Model, Wang Yu, Shouwen Yao, Jilin Liu, Dezhi Huang, Qinghua Zhang, Yi Ran

Journal of System Simulation

Abstract: A new method of virtual prototyping modeling was proposed based on assembly model, concerning the relation between assembly forms and dynamic constrains. With the transformation of assembly forms and dynamic constrains, a virtual prototyping model was built by the use of constrain models. Analysis of principle of modeling virtual prototype based on assembly was carried out, and the corresponding relationship between the assembly constraints in Pro/E and constraint block was studied and the method of modeling gear transmission was researched. With the utility of SimMechanics, a model library facing mechanism analysis under Simulink, a concept verification of a simple …

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Research On Simulation Of Flexible Rope For Ship, Mincang Liang, Yin Yong Aug 2020

Research On Simulation Of Flexible Rope For Ship, Mincang Liang, Yin Yong

Journal of System Simulation

Abstract: In view of the problems on unreal-time, less realistic and the instability of the marine flexible rope simulation system, one kind of structure-bending spring model was proposed based on the traditional mass-spring model. Bending springs were added in the model to limit the abnormal bending phenomenon in the particle of model by setting different elasticity and damping coefficient for two kinds of spring to simulate the ropes with different rigidity. In order to guarantee the stability and accuracy of the model, improved Euler method was adopted for numerical solution. At the same time, position adjustment method and speed …

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Impact Of Consistency Between Visually Perceived Movement And Real Movement On Cybersickness, Cai Li, Dongdong Weng, Zhenliang Zhang, Xingyao Yu Aug 2020

Impact Of Consistency Between Visually Perceived Movement And Real Movement On Cybersickness, Cai Li, Dongdong Weng, Zhenliang Zhang, Xingyao Yu

Journal of System Simulation

Abstract: The cybersickness is still a huge obstacle for virtual reality (VR) system. Current researches on cybersickness are mostly based on static or dynamic simulators, while studies in the real movement state is rare. An evaluating system which employed a head-mounted display (HMD) with a running vehicle was proposed to study the cybersickness in the real movement state. In this system, users sitting in the vehicle could see virtual scenes which was consistent with the real motion through the HMD. Subjective and objective evaluating experiments were proposed to analyze the different levels of the cybersickness caused by visual-vestibular conflict. …

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Ship Floating Calculation Based On Cgal, Zhizhou Wang, Xiaofeng Sun, Yin Yong, Chunlei Liu Aug 2020

Ship Floating Calculation Based On Cgal, Zhizhou Wang, Xiaofeng Sun, Yin Yong, Chunlei Liu

Journal of System Simulation

Abstract: To improve the computational accuracy of ship floating condition, a method of ship floating calculation was proposed based on CGAL (Computational Geometry Algorithms Library). By using the slicing module in CGAL, the offset table was obtained through longitudinally slicing 3D design surface; The shell data were gained by simplification and equidistant offsetting; The Jacobi matrix coefficients were achieved by intersecting water plane and shell data; Ship floating condition equations were solved by Newton iteration method. Taking Bulk carrier "SHANDONG REN HE" as an example, ship floating calculations under ten typical loading conditions were carried out. The computational error between …

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Paralleled Dynamic Crowd Emotion Contagion Algorithm, Xiang Nan, Mingmin Zhang, Lingyun Zhu Aug 2020

Paralleled Dynamic Crowd Emotion Contagion Algorithm, Xiang Nan, Mingmin Zhang, Lingyun Zhu

Journal of System Simulation

Abstract: As the positions of crowd usually change dynamically, then computing the contagion process becomes a challenge. There current algorithms were too time consuming to be adopted as they needed to calculate the reactions between every two objects. In order to solve this problem, a social force based contagion computing algorithm with GPU acceleration was provided. Individuals’ affection fields were projected onto two dimensional mesh grid and represented by the nine-box diary; The social force reactions between individual and nearest neighbors were computed to get the moving position; The contagion results from nearest neighbors were calculated. All of these steps …

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Overview Of Cartogram Algorithm, Chen Yi, Yunfang Zhao, Xiaomin Du Aug 2020

Overview Of Cartogram Algorithm, Chen Yi, Yunfang Zhao, Xiaomin Du

Journal of System Simulation

Abstract: Cartogram is a type of visualization method for effectively presenting the geographical information distribution of the statistical data, which has a wide range of usage in many fields. The concepts, classifications and generation methods of the Cartogram were described. Different generation algorithms of it were summarized, considering the continuity and regularity features. Besides, from the two aspects of both statistical and geographical distortions, three evaluation indexes were proposed: an index that evaluated whether the area sizes represented the true attribute values; and one which represented the degree of the regional shape distortions; and last but not the …

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Random-Walk Smokescreen Simulation Model Of Real-Time Correction, Sun Xun, Xuanyu Wang, Wang Xian, Shunhua Liu Aug 2020

Random-Walk Smokescreen Simulation Model Of Real-Time Correction, Sun Xun, Xuanyu Wang, Wang Xian, Shunhua Liu

Journal of System Simulation

Abstract: Gaussian diffusion mode of smokescreen is not suitable for complex atmospheric conditions and it is not easy to accurately obtain statistical properties of particles by utilizing random-walk mode, so the practicability of these two kinds of modes is limited. In view of the problems mentioned above, the revised random-walk smokescreen simulation model method was put forward, in the method, mathematical morphology algorithm was utilized to detect the data on smokescreen edge in a video in real-time and the model was rectified in real-time on basis of such data. The test result indicates that the revised model is suitable for …

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Fast Image Blending Using Seeded Region Growing, Yili Zhao, Xu Dan, Wenhua Qian, Zhang Yan Aug 2020

Fast Image Blending Using Seeded Region Growing, Yili Zhao, Xu Dan, Wenhua Qian, Zhang Yan

Journal of System Simulation

Abstract: This paper presented a novel approach for combining and blending a set of aligned images into a composite mosaic with no visible seams. The compositing seam is found efficiently via seeded region growing using a photometric criterion. A contribution of this paper is to use seeded region growing on image differences to find possible seams over areas of low photometric difference. This can result in significant reduction of blending time. The using of seeded region growing over image pairs guaranteed the approximate optimal solution for each intersection region. The independence of such regions makes the algorithm suitable for parallel …

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Design Of Simulation System About Laser Weapon Cooperative Engagement, Wang Xin, Xu Lei, Zhiyong Su Aug 2020

Design Of Simulation System About Laser Weapon Cooperative Engagement, Wang Xin, Xu Lei, Zhiyong Su

Journal of System Simulation

Abstract: To satisfy the need of air defense combat in the future, the concept of cooperative combat of new laser weapons and traditional anti-aircraft weapons was proposed. The simulation system based on HLA aimed to improve the performance of the system of traditional anti-aircraft weapons. The whole system was mainly divided into three parts: simulation platform, equipment simulation and three-dimensional simulation. Firstly, the object class and interaction class were designed according to federal members and federal integration. Then the important part was the three-dimensional modeling and simulation work of every weapon system. Finally, the air defense simulation system was …

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3d Real-Time Visualization And Simulation Platform For Collaborative Path Planning Of Ua, Chen Gong, Xu Lei, Zhiyong Su Aug 2020

3d Real-Time Visualization And Simulation Platform For Collaborative Path Planning Of Ua, Chen Gong, Xu Lei, Zhiyong Su

Journal of System Simulation

Abstract: There are still some issues existing in current path planning of UAV, such as planning result simulation verification and 3D visualization. To solve the problems, a 3D real-time visualization and simulation platform for collaborative path planning of UAV was proposed. The target area was divided and calculated. The reconnaissance beam of UAV was modeled with virtual camera, the intersection points obtained quickly based on graphics hardware. The terrain mesh was calculated by scan-line polygon filling algorithm, reconnaissance information was recorded and analyzed, and the color temperature maps were given. Through the actual operation by the simulation platform, simulation …

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Three-Dimensional Data Exploration Technology Based On Large-Scale Complex Geometrical Surfaces, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang Aug 2020

Three-Dimensional Data Exploration Technology Based On Large-Scale Complex Geometrical Surfaces, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang

Journal of System Simulation

Abstract: Three-dimensional physical field data exploration visualization based on large scale complex geometric surface is of great value in three-dimensional electromagnetic simulation applications. Research was proposed which was suitable for massively parallel processing technology of three-dimensional data exploration. The concept of dual-data-source and data filtering policies was introduced based on contracts. Clipping algorithms based on spatial bounding box and data probing algorithm can support accurate three-dimensional data profiling for complex surface geometry. Research results have been applied to significant practical applications, such as the fuselage characteristics of electric field distribution analysis and high value targets within the seeker's accurate …

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Research On Space Environment Simulation Technology Based On Mobile Platform, Xiaofei Hu, Zhou Yang, Pengfei Li, Jiwei Xu, Xianguang Xue Aug 2020

Research On Space Environment Simulation Technology Based On Mobile Platform, Xiaofei Hu, Zhou Yang, Pengfei Li, Jiwei Xu, Xianguang Xue

Journal of System Simulation

Abstract: Based on the study of the spatial visualized simulation, a novel visualized simulation technology of spatial objects built on mobile platform was developed. Critical technologies include the organization, scheduling and mapping with the background of 3D starry sky, calculation and visualized simulation of spacecraft orbit, and storage, organization, dynamic scenario-based updated rendering of 3D digital earth mega geographic data. A fractionized tile algorithm covering the scope of screen was proposed. Projection ranged on the screen was taken as the criteria of fractionation of tiles in the algorithm. Testing results show that the fractionation is correct. Spatial simulation system …

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Real-Time Rendering Of Large-Scale River In Inland River Ship Simulator, Xiaoming Zhai, Yin Yong, Helong Shen Aug 2020

Real-Time Rendering Of Large-Scale River In Inland River Ship Simulator, Xiaoming Zhai, Yin Yong, Helong Shen

Journal of System Simulation

Abstract: To improve the reality of river visual in inland river ship simulator, a method of rendering large scale river which could be applied for inland river ship simulator was proposed. The river flowing field was built though the conception of stream function, and the algorithm of Poisson disk sampling was used to control the distribution of river flowing field. This could balance the relationship between efficiency and effect of river surface. The parallelism and programmability of GPU was adopt to render river surface. The results show the river flowing field generated by algorithm of stream function can reflect …

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Simulation System For Testing Ship Dynamic Positioning Control Algorithm, Xiaobin Qian, Yin Yong, Helong Shen, Xiaofeng Sun, Xiufeng Zhang Aug 2020

Simulation System For Testing Ship Dynamic Positioning Control Algorithm, Xiaobin Qian, Yin Yong, Helong Shen, Xiaofeng Sun, Xiufeng Zhang

Journal of System Simulation

Abstract: To overcome the disadvantage of ship dynamic positioning control algorithm tests on sea trials, which features high risk, long debugging period and high expense, a simulation system for testing ship dynamic positioning control algorithm was designed. Motion mathematical model of dynamic positioning vessel and ocean disturbance model were established. The function requirements were proposed based on the characteristic of DP vessel movement. Architecture and implementation of the simulation system were introduced. Testing process and the related interface was descripted. A simulation was conducted on a DP supply vessel, which shows that: the simulation system can verify the effectiveness …

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Circular Space-Filling Algorithm For Hierarchical Data Visualization, Kun Hou, Zhilong Li, Yuchao Feng, Chen Yi Aug 2020

Circular Space-Filling Algorithm For Hierarchical Data Visualization, Kun Hou, Zhilong Li, Yuchao Feng, Chen Yi

Journal of System Simulation

Abstract: The existed Circle Packing methods mainly take the style of top-down to arrange all the nodes. When the nodes of different layer was arranged, the scaling and translation would cause relative high time complexity of the algorithm, and the size proportional discordance of nodes of different father nodes but the same layer, and it also causes the problems like defective tightness between the layouts of father nodes and child nodes. To solve problems above, on the basis of summarizing methods of arranging brother nodes of the same layer, the algorithm——CRCA(Circle and Rectangle Center Algorithm) was proposed, which took the …

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Antenna Model In Simulation Of Spacecraft, Ti Zhou, Miao Yi, Sun Jun Aug 2020

Antenna Model In Simulation Of Spacecraft, Ti Zhou, Miao Yi, Sun Jun

Journal of System Simulation

Abstract: To give a solution how to catch relay satellite by spacecraft in the simulation system of manned craft, several 2D craft models were studied in the simulation software based on HLA, and some sufficient and necessary conditions and the methods were given to compute the visibility of relay satellite according to these models. On these methods, 3D antenna model and the orbit and attitude model of spacecraft were researched, and 3D antenna model was given with attitude information of craft. Finally, matrix translations were used to translate some vectors to the same reference frame, and the visibility was decided …

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Parallel Rendering Of Massive Aircraft Cad Models, Dunming Tan, Guoting Cao, Juanfang Lang, Yang Shuo Aug 2020

Parallel Rendering Of Massive Aircraft Cad Models, Dunming Tan, Guoting Cao, Juanfang Lang, Yang Shuo

Journal of System Simulation

Abstract: A parallel rendering method was presented with PC clusters in order to render massive aircraft CAD models in real time with high resolution. PC clusters were used for sort-first based rendering, BVH tree was built for efficient frustum culling, DID screens were utilized for high resolution display. In addition, multi-CPUs were exploited for thread based parallel out-of-core paging, frustum culling, BVH tree building and rendering. The experimental results show that by this parallel rendering PC clusters consists of 15 PC nodes, aircraft CAD models with 1.7 million of triangles can be rendered in real-time with resolution of 6800* …

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Lattice Boltzmann Fluid Simulation Based On Parameters, Zhongxiao Guo, Huiwen Liu, Xuemei Liu, Gao Yang Aug 2020

Lattice Boltzmann Fluid Simulation Based On Parameters, Zhongxiao Guo, Huiwen Liu, Xuemei Liu, Gao Yang

Journal of System Simulation

Abstract: In computational fluid dynamics (CFD), the lattice Boltzmann Method (LBM) has become the mainstream method of fluid numerical simulation based on Navier-Stokes equations. The visualization of numerical results and the real-time rendering of fluid animation could provide a visual method for data analysis. A velocity field drawn method for two-dimensional visualization was proposed based on LBGK equation and D2Q9 model design algorithm model, transforming floating-point fluid velocity value into the intensity values, which was used by the RGBA color rendering method. For three-dimensional visualization, Particle Level Set Method (PLSM) was used to track the fluid surface and coupled it …

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Research On Online Simulation Technology Of Intelligent Distribution Network Based On Distributed Component Service, Xueshun Ye, Wanxing Sheng, Xiaoli Meng, Keyan Liu, Yinglong Diao Aug 2020

Research On Online Simulation Technology Of Intelligent Distribution Network Based On Distributed Component Service, Xueshun Ye, Wanxing Sheng, Xiaoli Meng, Keyan Liu, Yinglong Diao

Journal of System Simulation

Abstract: Simulation architecture of intelligent distribution network was investigated based on component service, Service Oriented Architecture computing framework, modules coordination mechanism and component deployment and realization method were proposed. And data interactive interface, transmission and integration method with online data resources were proposed. Meanwhile, distribution network simulation model, including photovoltaic, wind power and other distributed generation was established, which designed online power flow, fault calculation, reliability, reactive power optimization, distributed generation locating and sizing function module. An online simulation system of intelligent distribution network was realized on basis of the architecture and method above. Through a 10 kV …

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Virtual Simulation System Of Cutter Suction Dredger Based On Unity3d, Pengfei Yao, Zhengming Chen, Tong Jing, Lina Qian Aug 2020

Virtual Simulation System Of Cutter Suction Dredger Based On Unity3d, Pengfei Yao, Zhengming Chen, Tong Jing, Lina Qian

Journal of System Simulation

Abstract: In order to solve some shortages for the traditional training of cutter suction dredger, a virtual simulation system was designed using Unity3D, which mainly targeted at operational procedures of construction and display of construction environment. Mesh deformation and texture changing were used to realize the simulation of the soil-cutting. The 2D path simulation which included the simulation of stone crushing and proportion of sand in the pipeline was realized by means of path-finding algorithm. 3D display and human-computer interaction were realized by virtual reality devices, which could improve the effect of the virtual simulation.

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On Simulating Marine Radar Echo Intensity Generated By 3d Graphic Rendering, Shilian Cao, Yicheng Jin, Yin Yong Aug 2020

On Simulating Marine Radar Echo Intensity Generated By 3d Graphic Rendering, Shilian Cao, Yicheng Jin, Yin Yong

Journal of System Simulation

Abstract: The echo image cannot show reliable occlusion between objects, and the echo intensity cannot represent physical characteristics of electromagnetic wave propagation in the existing marine radar simulator. To solve these problems, a new method of generating radar echo image was raised on the basis analyzing the method of ray tracing. 3D visual database was used as data source, the marine radar echo image was generated by the method scene graphic rendering. A model based on radar equation was raised to compute marine radar echo intensity. The model gave the method of computing path attenuation, rain attenuation and …

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Research On Mathematical Model Of Yacht In Yacht Simulator, Xiaofeng Sun, Yin Yong, Hongyu Zhou, Xiufeng Zhang Aug 2020

Research On Mathematical Model Of Yacht In Yacht Simulator, Xiaofeng Sun, Yin Yong, Hongyu Zhou, Xiufeng Zhang

Journal of System Simulation

Abstract: Mathematical model of yacht is one of the key technologies for the development of yacht simulator. According to the separate model of MMG (Maneuvering Model Group), a planar motion model of yacht was established. The hydrodynamic coefficients were obtained through ship model test by using PMM (Planar Motion Device). Hydrodynamic forces and moments acting on the hull and propeller and rudder were calculated respectively. Ship motion equations were solved by means of the fourth order Runge-Kutta method, and ship motion parameters were achieved. Simulated program was coded through Visual Studio 2013, and simulations of three yachts were …

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Modelling Of Boom Crane Loading System Of Marine Engineering Ship, Helong Shen, Yin Yong, Xiujie Wang Aug 2020

Modelling Of Boom Crane Loading System Of Marine Engineering Ship, Helong Shen, Yin Yong, Xiujie Wang

Journal of System Simulation

Abstract: Development of ocean resources has a high degree dependence on marine engineering equipment. Among them, marine engineering ship has been widely used in many areas. Cranes on ship play an important role on transferring cargoes. The boom crane which is the most common crane on marine engineering ship was chosen as researching object. According to its real motion law, the crane system’s motion model was built with Lagrange equation which was solved with Fourth-order Runge-Kutta. The dynamics characteristics of the crane in different forms of work were analyzed.

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Igbt Radiator Design And Simulation, Weijie Dong, Xiaoli Meng, Xiaohui Song, Li Wei Aug 2020

Igbt Radiator Design And Simulation, Weijie Dong, Xiaoli Meng, Xiaohui Song, Li Wei

Journal of System Simulation

Abstract: The power component IGBT is the main heat source in the current-transformer equipment, the heat affects safe operation seriously, so the radiator design is very important. Taking a certain kind of IGBT as an example, the operating power consumption was analyzed and calculated, the design method of the radiator was studied, and the modeling of radiator with software of SolidWorks was designed, which was exported into the finite element analysis software of Ansys, making the thermal simulation combining the reality of IGBT operating environment, and comparing the cooling effect of different radiator configuration. A theory method was provided …

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Data Visualization And Interactive System Facing Educational Practice, Jinpei Qiang, Dai Song Aug 2020

Data Visualization And Interactive System Facing Educational Practice, Jinpei Qiang, Dai Song

Journal of System Simulation

Abstract: The data-driven visualization interactive system was implemented. According to the data visualization models, five modules were designed, which were the input module, visualization template module, visual editing module and output module. It was implemented by calling the D3, jQuery and other JavaScript library and binding the events with browser DOM. The visualization system was applied to educational practice in different disciplines which realized the evaluation of data visualization technology. Practice shows that the platform can not only meet education demand of cross-disciplinary but also simulate students’ interest in learning through visualization and interactive technology.

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