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Articles 2131 - 2160 of 3960

Full-Text Articles in Numerical Analysis and Scientific Computing

Identification And Visual Analysis Of Structure Characteristics Of Severe Storm, Jiayi Xu, Xuanxuan Huang Aug 2020

Identification And Visual Analysis Of Structure Characteristics Of Severe Storm, Jiayi Xu, Xuanxuan Huang

Journal of System Simulation

Abstract: A technique of adaptively extracting the feature regions from radar storm data was proposed based on the meteorological radar theory and historical statistics. A logical analysis strategy was proposed to identify convective cores, searched full convective regions to extract isolated storm cells. The changing of reflectivity data and corresponding gradient were analyzed to classify four typical structures. In order to accurately show the extracted spatial structures of storm cell, a parallel rendering framework was constructed by improving the ray-casting algorithm. Experiment results show that the proposed technique can quickly and accurately identify and visualize the spatial structure of sever …

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Improved Support Vector Pre-Extracting Algorithm In Speech Recognition Application, Hao Rui, Yanbo Niu, Xiu Lei Aug 2020

Improved Support Vector Pre-Extracting Algorithm In Speech Recognition Application, Hao Rui, Yanbo Niu, Xiu Lei

Journal of System Simulation

Abstract: Support vector machine (SVM) training is difficult for large-scale data set of speech recognition. A new SVM pre-extracting algorithm was proposed. On the one hand, kernel Fuzzy C-Means clustering was separately performed on each class of original data set. All the cluster centers were as a representative set of each class. On the other hand, according to the geometric distribution of support vectors and combined with the classification strategy of one-versus-one for SVM multi-class classification algorithm, boundary samples were extracted as support vectors for SVM to training and prediction. The algorithm was applied to embedded speech recognition system. Experiments …

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Trusted Scheme For Defending On-Off Attack Based On Beta Distribution, Weidong Fang, Zhidong Shi, Lianhai Shan, Fengrong Li, Xiuzhi Wang Aug 2020

Trusted Scheme For Defending On-Off Attack Based On Beta Distribution, Weidong Fang, Zhidong Shi, Lianhai Shan, Fengrong Li, Xiuzhi Wang

Journal of System Simulation

Abstract: Using encryption and authentication mechanisms can only prevent external attacks, but these mechanisms for internal attacks are invalid in Wireless Sensor Networks (WSNs). On-off attack also belongs to internal attacks, which has more concealment and aggressive, due to its reputation value dynamic changing. By using difference value and trend analysis based on BETA distribution, an effective trust mechanism was proposed to defend On-off attack. Simulation shows that this scheme can defend On-off attack, and be easy to implement.

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

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

Journal of System Simulation

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

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Online Identification Path Following Cascade Control Of Non-Holonomic Mobile Robot, Zilong Liu, Shaokai Hu, Liu Jie, Yagang Wang Aug 2020

Online Identification Path Following Cascade Control Of Non-Holonomic Mobile Robot, Zilong Liu, Shaokai Hu, Liu Jie, Yagang Wang

Journal of System Simulation

Abstract: A DC motor driven wheeled mobile robot path following control problem was considered, where the robot model was regarded as a cascade system consisting of the equation of the drive motor and the mobile robot kinematics equations. Taking the output speed of motor-driven equation as the input of the kinematic equations, identifying these time-varying parameters of the driven equation online, adding the values after identification to the controller, a feedback linearization path following control scheme was proposed. The scheme both investigates the dynamic characteristics of kinematics model and motor drive, so that the results better follow the actual cases …

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

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

Journal of System Simulation

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

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

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

Journal of System Simulation

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

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

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

Journal of System Simulation

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

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

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

Journal of System Simulation

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

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Time-Cost Risk Analysis For Complex Product Development Project By Simulation, Baosen Yang, Yang Nan, Cui Li Aug 2020

Time-Cost Risk Analysis For Complex Product Development Project By Simulation, Baosen Yang, Yang Nan, Cui Li

Journal of System Simulation

Abstract: Since complex product R&D project is characteristic with more stochastic factors, a dynamic simulation model of stochastic activity network was established for complex product R&D projects by consideration of the activity iteration and its dynamic characteristics. The methods of describing task rework probability, rework impact, iteration rework policy and so on were researched deeply. A case study illustrates the modeling process and the result of simulation.

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Modeling And Simulation Of Rectifying Circuit For Simultaneous Wireless Information And Power Transfer, Zuxiang Zheng, Lenan Wu Aug 2020

Modeling And Simulation Of Rectifying Circuit For Simultaneous Wireless Information And Power Transfer, Zuxiang Zheng, Lenan Wu

Journal of System Simulation

Abstract: Simultaneous wireless information and power transfer (SWIPT) is intended to transmit information and energy simultaneously over the wireless channels. As a major component of SWIPT, a rectifying circuit is an essential influencing factor for power conversion efficiency of SWIPT. Closed-form equations of power conversion efficiency and input power of rectifying circuit were derived to predict the performance. This simplified model is useful for circuit design and optimization. The result of theoretical analysis and ADS simulation shows that Ultra Narrow Band (UNB) signal has a sine-like performance in wireless power transfer. Using UNB signal as a novel modulation scheme, and …

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Research On Simulation Method Of Unconformity Surface In Rock Mass Based On Pfc3d, Teijun Cui, Yundong Ma, Laigui Wang Aug 2020

Research On Simulation Method Of Unconformity Surface In Rock Mass Based On Pfc3d, Teijun Cui, Yundong Ma, Laigui Wang

Journal of System Simulation

Abstract: In order to accurately simulate the rock mass, considering the effects of the unconformity to simulation, the method was purposed to simulate the different contact situation using PFC3D based on the Particle flow theory, include: integration, parallel unconformity, angular unconformity. Simulation step include: define the rock coordinate system; determine the key points of contact trend; use MATLAB to fit the trend curve and get the parameters; use PFM to construct the model; shaping contact surface using FISH according the parameters. The structured model satisfies the above requirements, which proved the model is close to the actual rock mass mechanics …

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Transient Analysis Of Metro Vehicle Auxiliary Inverter During Pantograph And Catenary Off-Line, Xiaobo Li, Wu Hao, Jiechen Xu Aug 2020

Transient Analysis Of Metro Vehicle Auxiliary Inverter During Pantograph And Catenary Off-Line, Xiaobo Li, Wu Hao, Jiechen Xu

Journal of System Simulation

Abstract: Pantograph and catenary off-line brings great harm to the safe and reliable operation of subway vehicles. The equivalent process during off-line and the off-line equivalent circuit of subway vehicles was proposed. Taking a metro vehicles powered auxiliary inverter system as an example, the off-line transient analysis was carried out, and a simulation test was conducted. As shown in the results, the useful signal during off-line greatly reduced in vehicle system and the harmonics of Insulated Gate Bipolar Transistor (IGBT) voltage was greatly increased. The questions about heat-resistant and insulation arose, which caused the inverter module to damage and greatly …

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Simulation And Test Of Mold Transport Mechanism Of Multi Mold Cycle Production Line, Yanjun Xiao, Liu Rui, Haiping Song, Jing Ran, Lihu He Aug 2020

Simulation And Test Of Mold Transport Mechanism Of Multi Mold Cycle Production Line, Yanjun Xiao, Liu Rui, Haiping Song, Jing Ran, Lihu He

Journal of System Simulation

Abstract: A new mold transport mechanism was put forward. In order to verify its strength and stability, a three-dimensional model of the institution was established making structural static analysis. The model was simplified according to the results of static analysis and the critical load of the mould delivery mechanism was calculated. Then the buckling analysis of the simplified model and the original model was conducted. According to the simulation analysis of the total deformation nephogram, the stress nephogram, critical load and buckling mode, the strength and stability of the mold transport mechanism were verified. The stress concentration area and the …

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

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

Journal of System Simulation

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

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Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu Aug 2020

Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu

Journal of System Simulation

Abstract: High/Low Temperature Environmental Simulation System is mainly used for the functional deploying test of the giant space deployable antenna and some large-scale structures at extreme high/low temperatures, and some other relevant tests. This project requests controlling the parameters of the system in a large range with high accuracy and no overshoot. Temperature control system has features of non-linearity, time-variant, and large delay, which seriously affect the speed and accuracy of the control. However, the conventional PID finds it difficult to achieve desired effect of control. A new scheme of compound control which is referred to as fuzzy-PID control based …

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Study On Simulation Modeling Of Dynamics For Landing Gear Of Helicopter With Deck-Landing, Zhang Liao, Guan Wei, Wang Gang, Li Wei, Pan Long Aug 2020

Study On Simulation Modeling Of Dynamics For Landing Gear Of Helicopter With Deck-Landing, Zhang Liao, Guan Wei, Wang Gang, Li Wei, Pan Long

Journal of System Simulation

Abstract: A simulation mathematics model was advanced which introduced the motion data of the deck at wheels/ground contact point into the dynamics model of the landing gear as follows: the space position and the level vector were obtained by computing the space position and pose of helicopter. The altitude and the level vector of the deck at wheels/ground contact point were obtained by computing the ship movement and the space position of helicopter's wheels. The ground reaction force was solved by that regard negative of relative altitude between the tire and the deck at wheels/ground contact point as the compression …

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Collaborative Simulation Between Remote Laboratories Based On Fiber-Optic Reflective Memory, Chijun Tian, Shengbing Shen, Yanlei Li, Xianzong Wang, Zhuofeng Guo Aug 2020

Collaborative Simulation Between Remote Laboratories Based On Fiber-Optic Reflective Memory, Chijun Tian, Shengbing Shen, Yanlei Li, Xianzong Wang, Zhuofeng Guo

Journal of System Simulation

Abstract: Taking advantage of independently developed HY-FB2125G Fiber-Optic Reflective Memory network interface and HY-FHX8 fiber-optic hub, the fiber-Optic Reflective Memory network was built and high speed data contribution was realized. With the elaborate design of hub-centered network architecture, simulation laboratories have the ability to process collaborative experiment and reuse test resources, which provides powerful support to accomplish collaborative simulation experiments.

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Application Of Flowsim For Traffic Management And Assessment In Shenzhen, Yuhan Jia, Jianping Wu, Yiman Du, Geqi Qi Aug 2020

Application Of Flowsim For Traffic Management And Assessment In Shenzhen, Yuhan Jia, Jianping Wu, Yiman Du, Geqi Qi

Journal of System Simulation

Abstract: Recently many traffic problems are faced by more and more cities. Since traditional method can no longer solve the above problems, and Transportation Demand Management (TDM) solutions are in desperate need. Also, as a successful application of Intelligent Traffic System (ITS), traffic simulation software has become an efficient way to carry out assessment for TDM. The implementation of congestion charge policy in Shenzhen was studied as a demonstration of TDM in China. Then the microscopic traffic simulation software, FLOWSIM, was introduced to simulate the traffic situation to do assessment of congestion charge. Based on the results, advices …

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Knowledge Engineering In Simulation Of Parallel Military System, Xiaogang Qiu, Zhang Peng Aug 2020

Knowledge Engineering In Simulation Of Parallel Military System, Xiaogang Qiu, Zhang Peng

Journal of System Simulation

Abstract: Military model is the integration and representation of military knowledge. The main task of military simulation is either to verify the exist knowledge or to produce new knowledge about military activities. By computational experiment, it is able to gain new knowledge about the parallel military system, which is able to enrich the origin knowledge system. Combined with parallel system technology, it's possible to study the evolution process of military knowledge, which is able to help us understand the complexity of military system. From the perspective of knowledge engineering, the processes of knowledge integration, representation and evolution were studied, and …

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Research On Dynamic Characteristics Of Hypersonic Vehicle Based On Large Scale Parallel Simulation, Hongyong Chen, Xuanhua Fan, Keying Wang, Fang Ye, Shifu Xiao Aug 2020

Research On Dynamic Characteristics Of Hypersonic Vehicle Based On Large Scale Parallel Simulation, Hongyong Chen, Xuanhua Fan, Keying Wang, Fang Ye, Shifu Xiao

Journal of System Simulation

Abstract: Based on the three predominant algorithms (Implicitly Restarted Krylov-Schur Method and Jacobi-Davidson Method ) and The PANDA Framework, a large-scale parallel computing system for modal analysis was established. The finite element model of typical wave-rider hypersonic vehicle was established and its dynamic characteristics were investigated. The numerical analysis reaches scale of 14,000,000 Degree of Freedoms (DOFs), and the number of MPI Cores is 1024. What's more, the difference of first 100 orders natural frequencies between PANDA and well known commercial software ANSYS is less than 0.01%, and mode shapes are absolutely the same, the efficiency of 1024 cores is …

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Design Of Unified Algorithm For Sampling Mpdu, Ti Zhou, Miao Yi, Yang Jian Aug 2020

Design Of Unified Algorithm For Sampling Mpdu, Ti Zhou, Miao Yi, Yang Jian

Journal of System Simulation

Abstract: The standard of CCSDS AOS is used in space exploration because of the process of the standard airspace system. The spacecraft missions have used multi-protocol data unit (MPDU) to multiplex the package channels. The range of MPDU and the data are different in different spacecrafts. This process brings some problems in the maintenance and the correctness of the algorithms of virtual channel multiplexing in simulation system. The applications of CCSDS in the world were researched, and the general definitions of MPDU in these missions were described. A circle memory was given to buffer the data of MPDU, two general …

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Wiftcpn Formalized Decision-Making For Auv Formation System Under Uncertainty, Lili Hao, Gu Hao, Fengju Kang, Huizhen Yang Aug 2020

Wiftcpn Formalized Decision-Making For Auv Formation System Under Uncertainty, Lili Hao, Gu Hao, Fengju Kang, Huizhen Yang

Journal of System Simulation

Abstract: Usually the acquired target information is not sufficient and certain enough due to inaccurate measurements, inconsistent granularity and noise, which results in the AUV formation decision-making system having some characteristics, such as discrete, time delay, hierarchical, fuzzy, inconsistencies. Therefore, an integrated formal approach of modeling, simulation and verification based on weighted intuitionistic fuzzy timed colored petri net (WIFTCPN) was proposed. The mapping relationship between WIFTCPN and fuzzy time, time delay and intuition fuzzy inference rules were established. Furthermore, corresponding reasoning decision simulation model under uncertain information was built by using CPN Tools. The properties including liveness, home and fairness …

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Human Action Recognition Based On Self-Learning Feature And Hmm, Jiarui Wen, Lina Liu, Rui Ling, Shiwei Ma Aug 2020

Human Action Recognition Based On Self-Learning Feature And Hmm, Jiarui Wen, Lina Liu, Rui Ling, Shiwei Ma

Journal of System Simulation

Abstract: The current methods of human action recognition by computer vision are mostly based on hand-craft features and usually prior knowledge-required. They inevitably depend on specific applications and neglect the inner structure of visional information. A novel method which integrated self-learned pose features and combined posture symbol rules was proposed to achieve the recognition of human action more efficiently. The structural features of posture silhouette were extracted and a codebook of primary posture was built through the establishment of a sparse auto-encoder network. Then, in the phase of recognition, the Hidden Markov Model was employed to train the models …

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Group-Based Image Compositing In Heterogeneous Environments, Liu Ning, Dengming Zhu, Zhaoqi Wang, Wei Yi Aug 2020

Group-Based Image Compositing In Heterogeneous Environments, Liu Ning, Dengming Zhu, Zhaoqi Wang, Wei Yi

Journal of System Simulation

Abstract: Image compositing requires dense inter-node communications and could easily become the bottleneck of a parallel visualization system. Conventional image compositing algorithms assume the environment is homogeneous and take no heterogeneity into consideration. In a heterogeneous environment, this assumption is likely to cause unreasonable load distribution among the nodes. To address this problem, we present a group-based image compositing algorithm in heterogeneous environments. It is able to distribute the workloads among the nodes according to computing and networking characteristics of the heterogeneous environments. We conduct a comprehensive evaluation on the ns-3 network simulator. Experiment results shows that when the environment …

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Combinatorial Optimization Of Resolution Level In Three-Dimensional Visualization, Yanyang Zeng, Zhenhai Yu, Weidong Liu Aug 2020

Combinatorial Optimization Of Resolution Level In Three-Dimensional Visualization, Yanyang Zeng, Zhenhai Yu, Weidong Liu

Journal of System Simulation

Abstract: In the process of developing three-dimensional visualization, it is necessary to select and adjust the combined solutions of the resolution hierarchy of multiple models. If only by artificial attempting will lead to the more times of iteration and lower design efficiency, therefore, a method, combinatorial optimization of models' resolution level, is proposed. Image information entropy is introduced for evaluating the image quality of the scene. According to the assessed value of visual effects and it is provided to the above method based on particle swarm optimization (PSO), the models with the resolution hierarchy can be matched and reorganized. Through …

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Intelligent Combination Of Discrete Lod Model For 3d Visualization Based On Visual Perception And Information Entropy Fusion, Che Li, Fengju Kang Aug 2020

Intelligent Combination Of Discrete Lod Model For 3d Visualization Based On Visual Perception And Information Entropy Fusion, Che Li, Fengju Kang

Journal of System Simulation

Abstract: With respect to the problem that single-index evaluation of visual quality in the process of intelligent combination of discrete Level-of-Detail (LoD) model for three-dimensional (3D) visualization can easily result in low reliability. Human visual perception and information entropy based multi-index fusion intelligent combination of discrete LoD model algorithm was proposed. Through analyzing the visual perception based image quality evaluation index, multi-index fusion evaluation intelligent combination of discrete LoD model framework was built. Comparative experiment with single index model combination bases on PSO method was designed. Model combination optimizing process utilized modified Particle Swarm Optimization (PSO) method which was strengthened …

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3d Flight Simulation System Visualization And Study Of Google Earth, Junyu Wang, Bin Cheng, Chuan Wang, Ren Jian Aug 2020

3d Flight Simulation System Visualization And Study Of Google Earth, Junyu Wang, Bin Cheng, Chuan Wang, Ren Jian

Journal of System Simulation

Abstract: Through the secondary development of Google Earth, flight training simulation system for visualization of realization, the system used B/S structure, the client browser using Google Earth, all the development on the server side. Mathematical model of aircraft was constructed; 3D modeling software SketchUp was used to establish a realistic fighter jets, missiles, high and low speed flame and other 3D model; the established 3D models was imported into Google Earth; by Microsoft VC ++ 6.0, the secondary development on Digital Earth was achieved, and the control of aircraft and other 3D models was realized; Matlab was used to verify …

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Track Planning For Unmanned Aerial Vehicles Based On Wolf Pack Algorithm, Yonglan Liu, Weimin Li, Husheng Wu, Wenjing Song Aug 2020

Track Planning For Unmanned Aerial Vehicles Based On Wolf Pack Algorithm, Yonglan Liu, Weimin Li, Husheng Wu, Wenjing Song

Journal of System Simulation

Abstract: Along with the diversification of missions that unmanned aerial vehicles (UAV) can carry out, track planning becomes basic precondition of UAV fulfilling missions successfully. Aiming to these, a method of track planning based on Wolf Pack Algorithm (WPA) was proposed. The method of equivalent terrain simulation was used to make enemy's threatens and terrain obstacles equal to peaks, thus the scene of track planning of UAV was built. Based on the scene, the WPA that extracted three intelligent behaviors including scouting, summoning and beleaguering was adopted to plan the track of UAV, whose start point and end point had …

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Research On Online Interaction Simulation Method Of Uav Flight Control System, Zhang Qing, Ran Jian, Yujun Hou Aug 2020

Research On Online Interaction Simulation Method Of Uav Flight Control System, Zhang Qing, Ran Jian, Yujun Hou

Journal of System Simulation

Abstract: UAV is widely applied to a variety of areas, for the huge advantages of remote controlling flight trajectory, iterant recovery and flexible mission payloads flight. The routine design methods for aerocraft control system cannot supply desire of UAV high accuracy flying and replying diversified compositive disturb. System composition and departmental function of UAV flight control system were introduced. An online interaction simulation method of UAV flight control system was advanced. The principle and principle of online interaction simulation were analyzed. The key techniques of constituting fiducial simulation model, real time updating and revising simulation model, on-line detecting a mass …

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