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Systems Science Commons™

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2020

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Articles 541 - 570 of 1494

Full-Text Articles in Systems Science

Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo Aug 2020

Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo

Journal of System Simulation

Abstract: Regarding inertia uncertainties, external disturbances and severe nonlinear coupling factors among the three channels including pitching, yawing and rolling at low-flying, controller design of wide adaptability could quickly and precisely realize the spacecraft attitude tracking control in a limited time. Based on the nonlinear model of the aircraft attitude, a kind of modified controllers was designed based on a robust adaptive sliding mode controller in the finite time convergence among three channels, the controller is continuous and differentiable. The adaptive controller was improved to stop a large controller output. Simulation results show that the designed attitude controller can …

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Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun Aug 2020

Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun

Journal of System Simulation

Abstract: A double closed-loop control system based on integral sliding mode was proposed to solve the problems of position and attitude control of an under-actuated, nonlinear coupling quadrotor model. An integral sliding mode control method was applied in the inner loop attitude control and a PID controller was designed in the outer loop position control. Due to the under-actuated property of the quadrotor model, desired pitch and roll angles were given by outer loop controller. The stability of the designed control system was proved by Lyapunov stability theorem. Simulation results on Matlab show the effectiveness of the proposed control system …

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Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling Aug 2020

Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling

Journal of System Simulation

Abstract: Since complex product R&D project is characteristic with more stochastic factors, a process model was established for complex product R&D project. The model made a comprehensive description of complex information dependencies between activities, timing between the upstream and downstream, feedback iterative relationship, parallel overlapping relationship, constraints and process parameters (time parameters, cost parameters, rework probability, rework impact, learning curve, etc.) by multi-view approach. Some case studies were proposed in detail to illustrate the modeling process. This provides new ways and means of the simulation for the complex product R&D project risk analysis.

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Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen Aug 2020

Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen

Journal of System Simulation

Abstract: Biological-chemical hazard once brought great loss to human beings, which encouraged people to develop a number of biological-chemical simulation models and corresponding simulation tools. However, influences of hazards to society were rarely considered in the past. By integrating biological-chemical simulation and artificial society computational experimental platform, it was feasible to assess hazard and analyze its social effects meanwhile, which efficiently assisted manager to estimate hazard risk and make decisions. Two methodologies of integration and a corresponding example were given.

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Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian Aug 2020

Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian

Journal of System Simulation

Abstract: Taking into account of poor stability, radioactive, higher maintenance costs and lack of manual detection of serious lag issues for online testing instrument of sodium aluminate concentration, combined with the mechanism analysis of the evaporation process, selecting parameters that affect the concentration of sodium aluminate solution as the auxiliary variables, using weighted loss function of the least squares support vector machine (Least Squares Support Vector Machine, LSSVM), a robust soft measuring for the concentration of sodium aluminate solution was achieved. Schmidt method was used to simplify the matrix and reduce the computational complexity. Industrial process data simulation results show …

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Integrated Modeling Method Of Flight Director And Guarantee Process, Yongliang Luo, Zhang Jun, Yuanhui Qin, Han Sheng, Yuanming Wang Aug 2020

Integrated Modeling Method Of Flight Director And Guarantee Process, Yongliang Luo, Zhang Jun, Yuanhui Qin, Han Sheng, Yuanming Wang

Journal of System Simulation

Abstract: The flight director and guarantee process as a kind of typical complex process, the modeling problem has become the current hot and difficult problem in the research field of the complex processes. An integrated modeling method of flight director and guarantee process was proposed combined with the typical process equipment air command and support building requirements. The following several aspects were mainly elaborated: The meta model of flight director process, service operation sequence modeling, machine process choreography. A prototype simulation and evaluation system was developed, and the rationality of the proposed method was analyzed combined with the application example.

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Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang Aug 2020

Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang

Journal of System Simulation

Abstract: An active-combine-passive homing model was established based on mathematics model of relative motion and automatically-adjust-lead-angle method. A simulation method of working process was designed about the active-combine-passive homing and simulates the trajectory. The influence on the guidance accuracy caused by homing range, sector angle and active-homing cycle was analyzed by using Monte Carlo method. Simulation result indicates that active-combine-passive homing owns a high level effect of interception, the guidance accuracy can be effectively improved by increasing homing range and homing sector angle and decreasing the active-homing cycle.

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Practice Method For Modeling The Virtual Group Organization Synergy, Zhang Hui, Zhang Hong, Sikun Li, Zeng Liang Aug 2020

Practice Method For Modeling The Virtual Group Organization Synergy, Zhang Hui, Zhang Hong, Sikun Li, Zeng Liang

Journal of System Simulation

Abstract: The process to model the behaviors of virtual group has been divided into two stages, task interaction design and abstraction of the model. In the first stage, the task process is designed through task decomposition, interaction design and behaviors determination based on task decomposition. In the second one, the organization synergy model is presented by designs on three different levels, the structure level, the element level and the relation level, based on the design of the primary analysis. The method provides a framework to instruct the modeling work of virtual group organization synergy.

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Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong Aug 2020

Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong

Journal of System Simulation

Abstract: In order to describe both the hybrid Agent behaviors and the mission space during the description process of combat system, the advantages of the PICS method and the CMMS describe method were combined. The ETDB describe method which stood for the entity was proposed by expanding the four factors of the CMMS describe method and was used for dividing the elements of MCSSU(The Man-machine Cooperative-combat System of Submarine and UUVs Formation) and concept modeling, and by describing an example, the method is compared with the traditional one. The concept models of MCSSU were formalized described by UML. The …

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Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang Aug 2020

Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang

Journal of System Simulation

Abstract: To improve the accuracy of the ship geometric properties calculation and the real-performance of the program, a method based on STL triangular mesh model was proposed to calculate the ship geometric properties. SH polygon clipping algorithm in computer graphics was used to calculate the intersection of ship and water plane. By using of coordinates systems affine transformation, 3D water plane was changed to 2D plane to extract the profile contour. Because the waterlines are monotone polygon, Mass center insertion method was proposed to finish polygon triangulation, computing speed was improved. Bulk carrier "Taihang 128" was taken as an …

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Precise Integration Method Application In Dynamic Simulation Of Wrap, Gao Shuai, Yin Yong, Xiaofeng Sun, Helong Shen Aug 2020

Precise Integration Method Application In Dynamic Simulation Of Wrap, Gao Shuai, Yin Yong, Xiaofeng Sun, Helong Shen

Journal of System Simulation

Abstract: A three-dimensional hydrodynamics mathematical model was proposed to describe the behavior of warp in order to realize the real-time visualization of trawler warp. The model of warp was established according to lumped mass method, which discreted warp into a series of nodes in space, while ignoring the twist, shake, etc,. By the index matrix of precise integration method solving the nonlinear dynamic equations of the warp,the information of position and velocity could be obtained.Thus the dynamic visualization of warp was realized. The iterative algorithm has very high accuracy and efficiency, and a wide rage of application. Comparing the …

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Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen Aug 2020

Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen

Journal of System Simulation

Abstract: Dynamics modeling and simulation of the mooring system are the key technologies in Anchor Handling Simulator (AHS), the model's quality and the visualization have great impact on the real-time, fidelity and immersed feeling in the scene simulation, and hence affect the quality of training on the anchor handling operation by using AHS. Based on the Lumped Mass Method the dynamics model of the mooring line was built up, and 4-order Runge-Kutta method was used to solve the model, and the computing speed could meet the demand on real-time; A model for the mooring line embedded in seabed soil was …

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A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu Aug 2020

A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu

Journal of System Simulation

Abstract: Virtual human assembly simulation is an important part of virtual assembly simulation, and it is also a key link in the process of product design verification. To simulate the human operation more accurately, efficiently and really has been the research focus of the related areas. For the human body, which could be taken as a complex movement system, a multi rigid body model was built in virtual environment; the model was divided into different joint chains according to the operating characteristics of the human body and ergonomics knowledge was used to construct the model's optimal target function; a multi-objective …

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Algorithm For Modeling Of Large-Scale Realistic Chinese Rose Based On Morphological Characteristics, Yang Meng, Wanghui Guo, Xiaoyu He, Lin Lin, Yang Gang Aug 2020

Algorithm For Modeling Of Large-Scale Realistic Chinese Rose Based On Morphological Characteristics, Yang Meng, Wanghui Guo, Xiaoyu He, Lin Lin, Yang Gang

Journal of System Simulation

Abstract: An algorithm of modeling individual plant and simulating large-scale garden scene of Chinese rose seasons was proposed based on morphological characteristics of plants. Real morphological data were accurately captured for the main organs of individual plant; These data should be deeply analyzed to gain the morphological properties, such as golden section; Topological relationships were established among the main stem and different high-order branches, branches and leaves. Meanwhile the main organs such as stem, leaves, flowers and thorns were simulated to complete the whole plant; The large-scale garden scene of Chinese rose were simulated based on the algorithm of Poisson …

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Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia Aug 2020

Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia

Journal of System Simulation

Abstract: For color transfer between colorful images, we used K-means clustering to classify image pixels and we also proposed nearest region matching algorithm. This algorithm can avoid the problem that multiple regions matched to the same region, and it can get the best match results between the two images. Translate the color space from RGB to for the two images. Divide color image and luminance mapped shape image using K-means models into the same number of classes. Determine the relationship between regions of the two images using Euclidean distance and the nearest region matching algorithm. Complete color transfer from color …

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Interactive Point Based Method For Soft Tissue Deformation In Surgical Simulation, Junliang Shan, Weixin Si, Xiaomeng Li, Wang Qiong, Yanjun Peng, Zhiyong Yuan, Pingan Wang Aug 2020

Interactive Point Based Method For Soft Tissue Deformation In Surgical Simulation, Junliang Shan, Weixin Si, Xiaomeng Li, Wang Qiong, Yanjun Peng, Zhiyong Yuan, Pingan Wang

Journal of System Simulation

Abstract: Although recent years have witnessed great improvement in the research of biomechanical simulation with user interactions for surgical simulation, it still suffers from many challenges such as computational model of soft tissue undergoing large deformation, collision detection, volume conservation, etc. A simple and efficient framework was proposed to meet these challenges. To well reproduce the mechanical response of organs, point based method was used to model the elastic solids undergoing large deformations. In addition, position based dynamics was adopted to model the objects collision, friction and volume conservation, which considerably improved the real-time performance and stability of complex interactions …

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Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan Aug 2020

Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan

Journal of System Simulation

Abstract: Given the interference from noise, poor quality and low identification of the night images, it is difficult to segment them by traditional color image segmentation method. Therefore, a novel dark color image segmentation method integrated MRF&Retinex was proposed. The -LPG-PCA filtering model was built to filter out noise of an image. The recovery function of the denoised image was constructed, before converting RGB color space to HSV color space, and the MRF & Retinex model was built for image enhancement and color correction operation. The denoised and enhanced color image was segmented by the MRF&FCM …

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Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang Aug 2020

Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang

Journal of System Simulation

Abstract: In order to improve the fidelity of dynamic aggregation process of virtual pedestrian, the relationship between gathering process and emotion contagion were simulated by integrating individual emotional interaction into crowd model. Individuals within the crowd firstly chose moving target and produced aggregation according to their expectation. The gathering process propagated the influences of target through the emotional interaction of individuals. The propagated influences affected individuals' expectation which made further efforts on crowd aggregation. Social force for simulating moving individuals and heat conduction theory were adopted by the model to simulate the emotional contagion of the crowd. Experimental results show …

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Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang Aug 2020

Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang

Journal of System Simulation

Abstract: More and more researchers have begun to study the human action recognition based on depth information and skeleton information since the Kinect has been released. A method of human action recognition based on the skeleton feature of key frames is proposed in order to improve the accuracy and timeliness of the human action recognition, and reduce the computational complexity. The clustered data was obtained by using K-means clustering algorithm, and then the key frames were extracted by using the clustered data. Two features for human action recognition were extracted, one is the feature of the position of human joint, …

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Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie Aug 2020

Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie

Journal of System Simulation

Abstract: The images sequence captured by UAV has the high resolution and high overlapping characteristics, so it is used in a wide range of scene reconstruction. However, the result of these state-of-art multi-view 3D reconstruction algorithms is unstable when dealing with large-scale UAV thousands of images. In this regard, the UAV low accuracy GPS / IMU parameters sequence was fused to the large-scale UAV image reconstruction process and the UAV sequence batched image reconstruction method was proposed. The image matching time and false matching number was reduced by using low-precision GPS / IMU priori information. Through the establishment of a …

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Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai Aug 2020

Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai

Journal of System Simulation

Abstract: In the process of modeling for scene visualization in marine simulator, ice region scene needs plenty of sea ice. Because of the numerous sea ice models, it may cause huge waste of time and space then make the whole simulation system in a poor real-time visualization situation, if there is no scientific or effective method. Applying quad-tree spatial index algorithm to sea ice dynamic modeling and management in ice region scene system of marine simulator, it could reduce consumption of time and space resources, improve the whole system fluency, and optimize the visualization of sea ice scene. And it …

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Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu Aug 2020

Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu

Journal of System Simulation

Abstract: Virtual simulation of fluid phenomena is of great value, and SPH fluid simulation-based method can truly reflect the motion of the fluid. However, as the size of the fluid increasing, the computation becomes large, especially fluid collision detection in complex scenes significantly reduces the efficiency of fluid simulation. By using GPU to accelerate SPH physical calculation and collision detection, and use of new neighbors particles chain table building method for particles searching, can improve fluid simulation efficiency. By using voxel scene rasterization of sampling methods, the calculation of collision detection was speeded up, and the storage space was saved …

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Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu Aug 2020

Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu

Journal of System Simulation

Abstract: Ball Pivoting algorithm is mainly used for surface reconstruction of point cloud data, the algorithm starts from a seed triangle, the ball along the seed triangle a side of rotation until the ball is exposed to a point and the edge and the composition of a triangle. The main disadvantage of this algorithm is that when the point cloud data is not uniform when the ball in the rolling process does not contact the point, and therefore will have a hole. A non-uniform point cloud data for improved reconstruction of the Ball Pivoting algorithm of the original point cloud …

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Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su Aug 2020

Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su

Journal of System Simulation

Abstract: To simulate the ship track in the marine virtual battle environment, a novel algorithm based on the single viewpoint video was proposed to reconstruct the ship stern wave. Gaussian filter was used to preprocess the video image and extract the long tail region from the video image; SFS algorithm was employed to compute the height field of the ship stern wave and generate its grid mesh; The normal of each vertex was computed based on the CUDA technology. The experimental results show that the reconstructed stern wave yields a good sense of reality. At the same time, it …

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Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing Aug 2020

Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing

Journal of System Simulation

Abstract: Skin color region image post-processing methods suitable for gesture recognition system based on computer vision was proposed. To solve the problem of face and hand often occur simultaneously in the image frame, the training process and grouping strategy of AdaBoost face detector based on Haar-like template were studied, and a rapid culling method of face region based on fusion of color information was proposed. To reduce the influence of noise in skin color region image, impulse noise suppression and skin-like region rejection was proposed. The test results have shown that the proposed methods can greatly speed up the face …

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Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li Aug 2020

Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li

Journal of System Simulation

Abstract: In view of the disadvantages such as the incomplete detection in image boundary which is caused by the global contrast significance detection algorithm, a visual saliency detection algorithm was proposed named salient region detection based on object-biased Gaussian refinement and global contrast. After segmentation based on graph, the global contrast was used to calculate the saliency value of each segmentation blocks. According to the location of the salient object, the center of the Gaussian model was adjusted. Both saliency detection value and Gaussian model combined effect of the final saliency values. The method paid attention to the …

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Evaluation Method Of Dimensional Visual Effects Based On Improved Grey Clustering, Yanyang Zeng, Panpan Jia Aug 2020

Evaluation Method Of Dimensional Visual Effects Based On Improved Grey Clustering, Yanyang Zeng, Panpan Jia

Journal of System Simulation

Abstract: Currently, the assessment of the three-dimensional visual effects is concentrated on the assessment methods, while ignoring the role of the index system. Therefore, an index system about fidelity evaluation of the visual simulation was proposed, including the various steps of the construction of the entire visual simulation system. The steps are from three-dimensional modeling to the output of simulation screen. On this basis, the evaluation method of dimensional visual effects was proposed based on improved grey clustering, and it is the combination of subjective and objective. The fuzzy evaluation was used to improve the method of determining the weights, …

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Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long Aug 2020

Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long

Journal of System Simulation

Abstract: With the development of computer graphics, the demand of the 3D model based on the Internet is growing; the related 3D models repository platform and service have emerged. The prototype system of 3D lightweight models repository, at the same time, it introduced the related cloud platform architecture and the framework of system platform was proposed and realized, moreover, the realized process of the system and some related key technologies were introduced, including lightweight JSON conversion algorithm, dynamic transaction management mechanism, adapter-based dynamic model loading mechanism, lightweight progressive meshes algorithm, sketch-based retrieval Using Content-Aware Hashing. …

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Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang Aug 2020

Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang

Journal of System Simulation

Abstract: Centerline extraction plays an important role in virtual bronchology. Organ segmentation and centerline extraction with correct topology structure is very difficult, especially for multiple branching structure organs. Therefore, a 3D airway tree segmentation and centerline extraction algorithm was proposed. A new region growing method was proposed to extract the main branch and sub-branch. The initial center was extracted based on the relationship of adjacent section. The center was corrected by computing the value of the determinant of Jacobian matrix, and the path with all the points was generated by Dijkstra's shortest path algorithm. The experimental results show that …

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Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun Aug 2020

Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun

Journal of System Simulation

Abstract: As the national flower of China, orchid has various kinds of types and shapes, and its bloom process has never been simulated before. A model library of orchid organs was established and a transformation algorithm with random-valued parameters was proposed based on the model library of orchid organs by studying botanical knowledge of orchids and taking orchids with different morphological characteristics as research subjects for virtual modeling. Different segmental transformations were respectively performed on each organ of orchids to simulate growth of the organs according to the growth law of orchids. Different examples for simulating different type of orchids …

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