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Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo 2020 1. State Key Laboratory of Virtual Reality Technology and System, Beihang University, Beijing 100191, China;;2. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191 , China;;3. Science and Technology on Aircraft Control Laboratory, Beihang University, Beijing 100191, China;

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 …


Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen 2020 National University of Defense Technology, Changsha 410073, China;

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.


Research And Simulation Of Cross Flow Heat Exchanger, Chengyun Wu, Guangwen Wang, Geping Li, Xudong Xin 2020 Shanghai Aviation Design Research Institute, Commercial Aircraft Corporation of China, Ltd., Shanghai 201210, China;

Research And Simulation Of Cross Flow Heat Exchanger, Chengyun Wu, Guangwen Wang, Geping Li, Xudong Xin

Journal of System Simulation

Abstract: Based on cell concept, the lumped parameter method was applied and the parameters in single heat exchanger cell were deduced. Thereafter 1, 4, 9,100 cells heat exchanger simulation model was set up and the simulation error and its influencing factors were analyzed. To simplify the algorithm and increase the calculation speed, as well as improve the accuracy of cross flow heat exchanger, the simplified heat exchanger model was proposed and reviewed. The research results show that the calculation of simplified heat exchanger is precise and the algorithm is simple. The model could be widely applied in cross flow heat …


Research Of Virtual Reality Technology In The Treatment Of Anxiety Disorders And Autism, Cuijuan Liu, Liu Zhen, Tingting Liu, Lu Tao, Fang Hao, Liangping Liu 2020 1. Faculty of Information Science and Technology, Ningbo University, Ningbo 315211, China;;2. Intelligent Control Research Institute, Zhejiang Wanli University, Ningbo 315101;

Research Of Virtual Reality Technology In The Treatment Of Anxiety Disorders And Autism, Cuijuan Liu, Liu Zhen, Tingting Liu, Lu Tao, Fang Hao, Liangping Liu

Journal of System Simulation

Abstract: The research of virtual reality technology in the adjuvant treatment of mental diseases has caused wide concern. Anxiety disorders and autism are two major mental diseases in today's society, which has been plagued by both adults and children. Conducting anxiety and autism's rehabilitation has important practical significance. The research of virtual reality technology application in anxiety disorders and autism was reviewed, emotion regulation in the adjuvant treatment of mental diseases was discussed, emotion agents and emotion models were summarized, a technical roadmap of emotion adjuvant treatment for mental diseases was proposed, the architecture of emotion agent was constructed, and …


Planar Structure Reconstruction For Indoor Scenes With Kinectfusion, Chenjianong Cai, Yifei Shi, Xu Kai, Dang Gang 2020 1. National University of Defence Technology, Changsha 410073, China;;2. Visual Computing Center, Shenzhen Institutes of Advanced Technology, Shenzhen 518055, China;

Planar Structure Reconstruction For Indoor Scenes With Kinectfusion, Chenjianong Cai, Yifei Shi, Xu Kai, Dang Gang

Journal of System Simulation

Abstract: Online scanning and reconstruction with KinectFusion has greatly improved real-time reconstruction of indoor scenes with consumer depth camera. However, due to the limitation of depth resolution of current depth cameras, the quality of reconstructed scenes is in general unsatisfactory. This is especially true for planar structures which are commonly seen in indoor scenes and important in defining the major structure of an indoor room. A novel method was proposed for extracting and reconstructing planar structures from point clouds of indoor scenes scanned acquired by KinectFusion.


Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong 2020 1. School of marine science and technology of Northwestern Polytechnical University, Xi'an 710072, China;;2. National Key Laboratory of Underwater Information Process and Control, Xi'an 710072, China;

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 …


Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li 2020 Department of UAV Engineering, Ordnance Engineering College, Shijiazhuang 050003, China;

Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li

Journal of System Simulation

Abstract: Loitering munition can be launched by various platforms. However, due to the impact of the delivery platform, the initial launching status of the missile-borne aircraft is uncertain. The leveled stage of missile-borne aircraft is different from other traditional flight modes. For this particular process, the dynamic model in leveled stage was established. Reliable aerodynamic parameters were obtained by Fluent's simulation method. Based on Simulink, the flight simulation module and control strategy in leveled stage were designed. Simulink-FlightGear method was used to display the real-time flight state. Through the simulation, flight characteristics in leveled stage are achieved, such as, motion …


Precise Integration Method Application In Dynamic Simulation Of Wrap, Gao Shuai, Yin Yong, Xiaofeng Sun, Helong Shen 2020 Navigation College, Dalian Maritime University, Dalian 116026, China;

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 …


Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui 2020 1.Beijing Electronic Science and Technology Institute, Beijing 100070, China;;2.Xidian University, Xi'an 710071, China;

Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui

Journal of System Simulation

Abstract: In order to protect user privacy, identification computing of user facial image data in the cloud was accomplished, the sparse representation based private face recognition method in the cloud was proposed. Terminal users collected face images and compared with face images in cloud database and then determined whether faces the terminal acquired belonged to the cloud face database, but both could not achieve each other's face image content. The method processed face images in database and cloud into sparse representation via a third-party terminal, then using Paillier and oblivious transfer homomorphic encryption algorithm to contrast sparse representation coefficient vector …


Combining Crf And Deformable Part Model For Pedestrian Detection, Ma Ji, Jingjiao Li, Ma Li, Zhao Yue 2020 1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China;;2. School of Information, Liaoning University, Shenyang 110036, China;;

Combining Crf And Deformable Part Model For Pedestrian Detection, Ma Ji, Jingjiao Li, Ma Li, Zhao Yue

Journal of System Simulation

Abstract: Pedestrian detection has been widely used in many fields. It is one of the focus in computer vision. The part-based detection method in the pedestrian detection shows excellent performance and has a strong adaptability in posture change of human body. But it is not good for Occlusion problem. When the Discriminative threshold is higher, miss rate is very high. Considering the disadvantage of LSVM method for mining hidden information, a two layers classifier was proposed based on the deformable parts model establishing conditional random field model for Occlusion problem. For learning model parameters, the stochastic gradient descent and …


A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu 2020 1. CIM Research Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;;

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 …


Parallel Radiosity Based Light Distribution Simulation Within Virtual Plant Canopy, Can Hou, Liyu Tang, Chongcheng Chen, Yifei Yang 2020 National Engineering Research Centre of Geospatial Information Technology, Spatial Information Research Center of Fujian Province, Fuzhou University, Fuzhou, 350002, China;

Parallel Radiosity Based Light Distribution Simulation Within Virtual Plant Canopy, Can Hou, Liyu Tang, Chongcheng Chen, Yifei Yang

Journal of System Simulation

Abstract: Owing to the computing-cost calculation of the form factor and the radiation energy in the traditional radiosity, a new method of parallel radiosity Based on CUDA (Compute Unified Device Architecture) was proposed to improve the performance of the implementation. Specifically, the implementation processes were as follows. The detailed 3D plant canopy model was loaded in the virtual scene. The solar altitude angle, solar azimuth and the radiation intensity were estimated according to the given time and the geographic location, and the light panel was generated afterwards, which was defined as radiation source on the basis of uniform triangular subdivision. …


Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia 2020 1. College of Information Science and Technology, Beijing Normal University, Beijing 100875, China;;2. Engineering Research Center of Virtual Reality and Applications, Ministry of Education, Beijing 100875, China;;

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 …


Automatic Registration Method Based On Curvature, Wenli Yu, Mingquan Zhou, Wuyang Shui, Zhongke Wu 2020 1. Department of Information Technology, Beijing Normal University, Beijing 100875, China;;2. Engineering Research Center for Virtual Reality Applications, MOE, Beijing 100875, China;

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 …


Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang 2020 1. Department of Computer, Shenyang Aerospace University, Shenyang 110136, China;;2. Liaoning General Aviation Key Laboratory, Shenyang Aerospace University, Shenyang 110136, China;;3. College of Information, Liaoning University, Shenyang 110036, China;

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, …


Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie 2020 Institute of Geographic Spatial Information, Information Engineering University, Zhengzhou 450001, China;

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 …


Research For Skeleton Tree Matching Of Microscopic Image Of Diatom Cells, Xiaoyan Qiao 2020 College of Mathematic and Information Science, Shandong Institute of Business and Technology, Yantai 264005, China;

Research For Skeleton Tree Matching Of Microscopic Image Of Diatom Cells, Xiaoyan Qiao

Journal of System Simulation

Abstract: The image analysis technology based on morphological differences has become an important method of algae recognition in recent years. A skeleton similarity matching method was proposed to recognize microscopic images of diatom cells. The gray surface vector model of image was established to make segmentation by keeping obscure seta; The skeleton was used to represent the Chaetoceros, and it was decomposed hierarchically by competition strategy. The Chaetoceros object was represented by skeleton tree by forming the rachis elements and branches into it. The similarity mode for microscopic images of Chaetoceros was established by defining the topological and geometric difference. …


Improved Method Of Extracting Hks Descriptors And Non-Rigid Classification Applications, Jingyu Jiang, Lili Wan 2020 1. Institute of Information Science, Beijing Jiaotong University, Beijing 100044, China;;2. Beijing Key Laboratory of Advanced Information Science and Network Technology, Beijing Jiaotong University, Beijing 100044, China;

Improved Method Of Extracting Hks Descriptors And Non-Rigid Classification Applications, Jingyu Jiang, Lili Wan

Journal of System Simulation

Abstract: In order to make the HKS(heat kernel signature)have wider applicability in non-rigid shape analysis, an improved method of extracting HKS descriptors for unconnected non-rigid 3D models was proposed. The largest connected component was obtained. The HKS descriptors of the largest connected component were calculated and those descriptors of the boundary vertices and their 1-ring neighbors were excluded. For shape classifications, the dictionary was learned for each class based on the sparse representation theory. For a test model, each dictionary was utilized to sparsely represent its descriptor set, and the most appropriate dictionary was determined by the representation error, …


Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai 2020 Navigation College, Dalian Maritime University, Dalian 116026, China;

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 …


Virtual Needle Insertion And Haptic Interaction, Gao Zhan, Pan Fei, Jiehua Wang, Haiyan Pan, Zhengzheng Jiang 2020 1. School of Computer Science, Nantong University, Nantong 226019, China;;

Virtual Needle Insertion And Haptic Interaction, Gao Zhan, Pan Fei, Jiehua Wang, Haiyan Pan, Zhengzheng Jiang

Journal of System Simulation

Abstract: Needle insertion or puncture has been widely practiced in clinical medicine. A VR based training system for needle insertion was implemented in this study. The mechanical model during insertion process was designed. Linear element model was applied to realize the simulation of soft tissue deformation. The friction and the stick-slip motion model between the puncture needle and the soft tissue were implemented to simulate the force interaction between needle and soft tissue. The haptic interaction of needle insertion was realized as well to enhance the user experience. The experiment results show that the simulation can reflect the process …


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