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Simulation System For Testing Ship Dynamic Positioning Control Algorithm, Xiaobin Qian, Yin Yong, Helong Shen, Xiaofeng Sun, Xiufeng Zhang 2020 Marine Dynamic Simulation and Control Lab., Dalian Maritime University, Dalian 116026, China;

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 …


Circular Space-Filling Algorithm For Hierarchical Data Visualization, Kun Hou, Zhilong Li, Yuchao Feng, Chen Yi 2020 Beijing Key Laboratory of Big Data Technology for Food Safety, School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China;

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 …


Antenna Model In Simulation Of Spacecraft, Ti Zhou, Miao Yi, Sun Jun 2020 Beijing Aerospace Control Center, Beijing 100094, China;

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 …


Parallel Rendering Of Massive Aircraft Cad Models, Dunming Tan, Guoting Cao, Juanfang Lang, Yang Shuo 2020 1. The First Aeronautical Institute of PLA Air Force, Xinyang, 464000, China;;

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* …


Lattice Boltzmann Fluid Simulation Based On Parameters, Zhongxiao Guo, Huiwen Liu, Xuemei Liu, Gao Yang 2020 1. Institute of Water Resources for Pastoral Areas, Ministry of Water Resources, China Institute of Water Resources and Hydropower Research, Hohhot 010020, China;;

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 …


Research On Online Simulation Technology Of Intelligent Distribution Network Based On Distributed Component Service, Xueshun Ye, Wanxing Sheng, Xiaoli Meng, Keyan Liu, Yinglong Diao 2020 China Electric Power Research Institute, Haidian District, Beijing 100192, China;

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 …


Virtual Simulation System Of Cutter Suction Dredger Based On Unity3d, Pengfei Yao, Zhengming Chen, Tong Jing, Lina Qian 2020 1. College of IOT Engineering, Hohai University, Changzhou 213022, China;;

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.


On Simulating Marine Radar Echo Intensity Generated By 3d Graphic Rendering, Shilian Cao, Yicheng Jin, Yin Yong 2020 1. Laboratory of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China;;2. Navigation collage, Jimei University, Xiamen 361021, China;

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 …


Research On Mathematical Model Of Yacht In Yacht Simulator, Xiaofeng Sun, Yin Yong, Hongyu Zhou, Xiufeng Zhang 2020 Key Lab. of Marine Simulation & Control, Dalian Maritime University, Dalian 116026, China;

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 …


Modelling Of Boom Crane Loading System Of Marine Engineering Ship, Helong Shen, Yin Yong, Xiujie Wang 2020 Key Lab. of Marine Simulation and Control, Dalian Maritime University, Dalian 116026, China;

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.


Igbt Radiator Design And Simulation, Weijie Dong, Xiaoli Meng, Xiaohui Song, Li Wei 2020 China Electric Power Research Institute, Beijing 100192, China;

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 …


Data Visualization And Interactive System Facing Educational Practice, Jinpei Qiang, Dai Song 2020 State Key Laboratory of Virtual Reality Technology, Beihang University, Beijing 100191, China;

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.


Research On Dynamic Construction Of Assembly Relation Of Transmission Device, Qinghua Zhang, Qingdong Yan, Shouwen Yao, Jilin Liu, Wang Yu 2020 Beijing Institute of Technology, Beijing 100081, China;

Research On Dynamic Construction Of Assembly Relation Of Transmission Device, Qinghua Zhang, Qingdong Yan, Shouwen Yao, Jilin Liu, Wang Yu

Journal of System Simulation

Abstract: Currently, virtual assembly research only focuses on the assembly relations of parts which are defined in cad software, and it is unable to dynamically construct or change parts’ assembly relations. Most of the research objects are simple geometry assembly, no complex structural assembly. To solve the problems efficiently, a dynamic assembly relation modeling method was proposed based on assembly feature. In the first part, the concepts of assembly feature and assembly feature plane were introduced. The assembly characteristic parameters and geometric elements were extracted from the typical assembly feature types which were defined based on the parts of the …


Joint Dynamics Simulation Analysis And Optimization In Carrying Manipulator Of Sound-Absorbing Board Packing Device, Yanjun Xiao, Feng Hua, Wang Zhao, Yonggeng Wang 2020 School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China;

Joint Dynamics Simulation Analysis And Optimization In Carrying Manipulator Of Sound-Absorbing Board Packing Device, Yanjun Xiao, Feng Hua, Wang Zhao, Yonggeng Wang

Journal of System Simulation

Abstract: As an important part of the sound-absorbing board packing device, the efficiency and operational stability of carrying manipulator play a decisive role on packing. When the natural frequency of carrying manipulator is close to the excitation frequency of motor, the carrying manipulator will shake violently. In response to above problems, we put joint dynamic simulation analysis of ADAMS and ANSYS Workbench on the carrying manipulator which is in use. We got the important components’ stress situation with the acceleration time of 0.1 s and the low-order natural frequency of the traverse key displacement in return. And on this basis …


Cooperative Task Assignment Simulation Of Multi-Uavs In Dynamic Environments, Tizhou Qiao, Xinping Guo, Yawei Li, Wenjun Zhang, Zhongyi Yin 2020 UAV Systems Engineering Institute, China Aerospace Electronics Technology Research Institute, Beijing 100094, China;

Cooperative Task Assignment Simulation Of Multi-Uavs In Dynamic Environments, Tizhou Qiao, Xinping Guo, Yawei Li, Wenjun Zhang, Zhongyi Yin

Journal of System Simulation

Abstract: In order to address the problem of cooperative task assignment for multiple UAVs, a parallel simulation framework was proposed for cooperative task planning based on HLA/RTI simulation through UAV aerodynamic simulations and flight control simulation, which could be more real and effective algorithm validation. The paths were optimized to account for randomization and threats in the environment by modeling the probability of UAV loss. By coupling the failure probabilities of each UAV to the missions of the other UAVs, reality of cooperation was improved significantly. In order to achieve the desired objectives, the stochastic simulation models were used to …


Real-Time Visualization Method For Log Data Stream, Li Hui, Hongqian Chen, Qianyu Yang, Chen Yi 2020 1. College of Management, Beijing Union University, Beijing 100101, China;;

Real-Time Visualization Method For Log Data Stream, Li Hui, Hongqian Chen, Qianyu Yang, Chen Yi

Journal of System Simulation

Abstract: To discover the network cheating behavior in the online examination room in real time, a log data flow visualization method was proposed. The monitoring log data flow was used as the data source of the method. The candidates, the examination machine and other information were extracted according to the rules of the log. The correct candidate/machine corresponding relationship was established according to the first related log record information. The main information elements were mapped to the visual elements for each log data. All students' status and behavior were presented in the same visual result. A clear reminder …


Improved Itti Visual Saliency Detection Based On Multi-Scale Tensor Space, Shimin Wang, Jihua Ye, Bailiang Cheng, Mingwen Wang 2020 College of Computer Information and Engineering, Jiangxi Normal University, Nanchang 330022, China;

Improved Itti Visual Saliency Detection Based On Multi-Scale Tensor Space, Shimin Wang, Jihua Ye, Bailiang Cheng, Mingwen Wang

Journal of System Simulation

Abstract: In view of internal dense uniform and clear borders image, through the saliency detection the target boundary is vague, so that the target object is not connected. In order to solve this problem, an improved Itti visual saliency detection method based on multi-scale tensor space was proposed. The method introduced the tensor space features, which preserved the original image spatial structure and correlation features, that could extract internal dense uniform image features, which made the target object connect, combining with saliency detection algorithm to finish feature extraction and target detection. Experimental results show that the proposed method can …


Point Cloud Modeling Based On Compactly Supported Radial Basis Function Under Kd Tree Index Strategy, Li Jia, Duan Ping, Yehua Sheng, Haiyang Lü, Siyang Zhang 2020 1. School of Tourism and Geographical Sciences of Yunnan Normal University, Kunming 650500, China;;2. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China;;3. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing 210023, China;;4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;

Point Cloud Modeling Based On Compactly Supported Radial Basis Function Under Kd Tree Index Strategy, Li Jia, Duan Ping, Yehua Sheng, Haiyang Lü, Siyang Zhang

Journal of System Simulation

Abstract: Modeling constructed by Compactly Supported Radial Basis Function (CSRBF) and visualization will fail. The main reason is that exhaustive search results in out of memory. KD tree can void exhaustive search due to the advantage of quickly searching. CSRBF combined KD tree was used to construct point cloud model. Modeling approach of CSRBF based on KD tree was proposed. KD tree index of the point cloud was constructed. CSRBF interpolation method was used to construct implicit function model of point cloud. Marching Cubes algorithm was to display model in 3D manner. The experimental results with rabbit point cloud show …


Image Resizing Method Based On Gradient And Visual Saliency, Xingquan Cai, Buni Honghao, Yuqing Qiao, Jinghua Liu, Fengxia Li 2020 1. School of Computer Science, North China University of Technology, Beijing 100144, China;;

Image Resizing Method Based On Gradient And Visual Saliency, Xingquan Cai, Buni Honghao, Yuqing Qiao, Jinghua Liu, Fengxia Li

Journal of System Simulation

Abstract: In order to delete the image region without obvious features, and not damage the main features of the target for mobile applications, the image resizing method was provided based on gradient and visual saliency. The original image was grayed, and the gradient energy matrix from the gradient of neighborhood pixels was obtained. The complex energy matrix was obtained by weighted sum of visual saliency energy and image gradient energy matrix. The cumulative energy matrix and minimal energy trajectory matrix were calculated, and the minimal energy seam of image was got. The image resizing was completed by deleting the minimal …


Color-Texture Image Segmentation Approach Designed By Integrating Geodesic Active Contour Model And Multilayer Graph Cut Model, Yang Yong, Liangren Zheng, Guo Ling, Yangdong Ye 2020 1. School of Information Engineering, Huang He Science and Technology College, Zhengzhou 450063, China;;2. Zheng Zhou University of Industrial Technology, Zhengzhou 450000, China;;3. School of Information Engineering, Zheng Zhou University, Zhengzhou 450060, China;

Color-Texture Image Segmentation Approach Designed By Integrating Geodesic Active Contour Model And Multilayer Graph Cut Model, Yang Yong, Liangren Zheng, Guo Ling, Yangdong Ye

Journal of System Simulation

Abstract: An approach of color-texture image segmentation was proposed based on geodesic active contour model and multilayer graph cut model. As the clustering centers were commonly descripted with constant densities, the two phase Chan-vese model was extended to multiphase geodesic active contour model by using the Gaussian distribution to describe the changing density for each phase, and meanwhile the geodesic active contour was added into the proposed model, so that the presented approach could capture out the concave edge. For the minimization of the proposed energy function, a corresponded multilayer graph cut model was designed for resolving global approximated …


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