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- Simulation (131)
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- Collision detection (14)
- Deep reinforcement learning (14)
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- Publication Year
Articles 1591 - 1620 of 3382
Full-Text Articles in Physical Sciences and Mathematics
Identification And Visual Analysis Of Structure Characteristics Of Severe Storm, Jiayi Xu, Xuanxuan Huang
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 …
Improved Support Vector Pre-Extracting Algorithm In Speech Recognition Application, Hao Rui, Yanbo Niu, Xiu Lei
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 …
Trusted Scheme For Defending On-Off Attack Based On Beta Distribution, Weidong Fang, Zhidong Shi, Lianhai Shan, Fengrong Li, Xiuzhi Wang
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.
Online Identification Path Following Cascade Control Of Non-Holonomic Mobile Robot, Zilong Liu, Shaokai Hu, Liu Jie, Yagang Wang
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 …
Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji
Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji
Journal of System Simulation
Abstract: A method based on the gray theory and identification model was proposed to predict the short-term wind power generation. GM(2,1) model was applied for establishing a wind speed prediction model with an iterative step. After the wind speed prediction procedure, a finite impulse response moving average nonlinear Hammerstein model was used in the modeling between wind speed and wind power generation. By adopting the stochastic gradient searching theory, a wind power generation forecasting algorithm was proposed. The proposed simulation shows that the presented method can forecast the real time power generation of wind turbine and raise the accuracy of …
High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang
High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang
Journal of System Simulation
Abstract: In the docking phase of orbit control task of space rendezvous and docking, smooth without overshoot, good robustness and fuel-saving control are required. To this end, a transient process for orbit control was proposed, and new controllers were designed on the basis of the transient process for the space rendezvous and docking. The ultimate goal was refined to the gradual arrival goal to build the transient process between the initial coordinate and the target coordinate of the system. The output of the transient process was designed as a smooth S-type curve. Three different orbit controllers of space rendezvous and …
Study Of Setting Up Simulation Platform Of Self-Adaptive Flight Control System With Self-Repair Function, Long Hao, Shujie Song
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 …
Uav Takeoff Decision Based On Neural Network Model Of Takeoff Capability, Yongtao Peng, Yueping Wang, Xiaoting Wang
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 …
Wood Structure Nondestructive Detection Based On Wavelet Analysis Ant-Colony Bp Network, Guoxiong Zhou, Xianyan Zhou, Jiejun Wang, Te Huang
Wood Structure Nondestructive Detection Based On Wavelet Analysis Ant-Colony Bp Network, Guoxiong Zhou, Xianyan Zhou, Jiejun Wang, Te Huang
Journal of System Simulation
Abstract: In view of the wood component glue line defect, a method of wood structure nondestructive detection was proposed based on ant colony BP neural network. The wood specimens was tested to obtain the test signal by ultrasonic testing instrument, in order to eliminate the testing effect of the tester gain control and defect size, angle variation on the test defect echo amplitude, the defect signal amplitude was needed to normalization. The wood component decomposition of ultrasonic signals was de-composite to different frequency channels by the domain band-pass characteristics of the wavelet frequency. By extract characteristic of the original signal …
Time-Cost Risk Analysis For Complex Product Development Project By Simulation, Baosen Yang, Yang Nan, Cui Li
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.
Modeling And Simulation Of Rectifying Circuit For Simultaneous Wireless Information And Power Transfer, Zuxiang Zheng, Lenan Wu
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 …
Transient Analysis Of Metro Vehicle Auxiliary Inverter During Pantograph And Catenary Off-Line, Xiaobo Li, Wu Hao, Jiechen Xu
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 …
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
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 …
Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei
Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei
Journal of System Simulation
Abstract: Considering the negative effects of mesh distortion on calculation accuracy in FEM simulation, a novel mesh free method named Smoothed Particle Hydrodynamics (SPH) method was employed to simulate the process of single CBN abrasive grain cutting TC4. Establishing a SPH model of TC4 workpiece and a FEM model of single abrasive grain with cutting edges similar to the real abrasive grain, the influences of cutting depth on grinding forces and chip formative process were studied systematically. The simulation results state that grinding forces enlarge with the increase of cutting depth, while grinding force ratio decreases. And TC4 chip formative …
3-Dimensional Kinematics Simulation Of Gear Hobbing, Rongchuang Zhang, Wang Jun, Wang Bo, Wanshan Wang
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 …
Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping
Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping
Journal of System Simulation
Abstract: The fluid mechanics principle and the triangle harmonic function were used to establish a simple and high real-time typical strong wind-shear field model. The simulation data of wind field velocity in horizontal fan-shaped scanning mode and vertical scanning mode based on the parameter and detecting mode of airborne phase array weather radar was proposed. The different characteristics of strong wind shear detected by airborne weather radar on the different altitude were proposed through simulation data analysis. The simulation data credibility of strong wind shear field was analized based on weather radar velocity of a strong squall line process …
Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo
Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo
Journal of System Simulation
Abstract: Cooperation is the base of Computer Generated Forces team behaviors; formation and formation changing are the mostly used team cooperation of tank unit CGF. By combining cooperation planning with joint intention, a formation cooperation method for tank unit CGF was promoted. According to the knowledge levels of different CGF roles about the cooperation, the commander role CGF planed conditions and restraints of the formation cooperation, and the subordinated CGF autonomy planed to concretely implement the cooperation, which significantly enhanced the formation cooperation efficiency. The joint intention was established before the implementation of the cooperation, all CGF revised cooperation action …
Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin
Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin
Journal of System Simulation
Abstract: The railway bulk oil transit operation is a hybrid (discrete/continuous) system because of the main body of the continuous flow oil and a variety of discrete events. According to the system’s characteristics of complex process, great difficulty, high risk, the oil transit operation model was established based on discrete rate simulation and system’s continuity, predict events, emergencies were analyzed. The model was converted into linear programming, the effective rate was calculated under constraints, and the operation process and event scheduling was simulated. It was verified that the model is feasible. By obtaining the dynamic behavior and real-time data, its …
Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang
Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang
Journal of System Simulation
Abstract: Coping with the distributed and complex threaten of networking attack, the requirement of coordinated defense of Firewall and IDS/IPS are becoming more and more urgent. As the existence of uncertainty of the judgment of Intrusion performed by IDS/IPS, Firewall and IDS/IPS often perform contradict action, that the same package matched the both rules of Firewall and IDS/IPS, and conflict arose, which would lead to illegal access control or deny of legal access control. The policies conflict detection algorithm of coordinated defense of Firewall and IDS/IPS were researched. The semantic models of firewall policy and IDS/IPS policy were proposed, the …
Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu
Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu
Journal of System Simulation
Abstract: The interoperability of command information system and combat simulation system is an important and difficult problem of building practical training environment. The four aspects of interoperability connotation were summarized. The demands of interoperability were analyzed. The status and development of interoperability, especially for C4ISR/Sim Technical Reference Model (TRM), Battle Management Language (MBL), Levels of Conceptual Interoperability Model (LCIM) were studied. The existing problems were summarized, and four kinds of solutions were proposed. The general technical framework of interoperability based on service oriented architecture was designed, and the interoperability solving method based on Ontology was given.
Knowledge Engineering In Simulation Of Parallel Military System, Xiaogang Qiu, Zhang Peng
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 …
Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji
Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji
Journal of System Simulation
Abstract: The modeling problem of Wiener errors-in-variables systems was investigated where measurements of the system input and output were corrupted by the additive white Gauss noise. After the provided reformulation of the errors-in-variables system, a two-stage algorithm was developed to estimate the unknown parameters with the first stage employing the total least-squares algorithm, followed by a singular value decomposition in the second stage. The asymptotic maximum likelihood estimation property under the PE condition was strictly proven that with data length tends to infinite, and the proposed total least-squares solution provided an asymptotic maximum likelihood estimate for the nonlinear system parameter …
Study On Simulation Modeling Of Dynamics For Landing Gear Of Helicopter With Deck-Landing, Zhang Liao, Guan Wei, Wang Gang, Li Wei, Pan Long
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 …
Research On Dynamic Characteristics Of Hypersonic Vehicle Based On Large Scale Parallel Simulation, Hongyong Chen, Xuanhua Fan, Keying Wang, Fang Ye, Shifu Xiao
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 …
Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng
Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng
Journal of System Simulation
Abstract: In order to make the quality of the simulation service not being affected by load dynamic changes, heuristic scheduling algorithm was proposed. Using the VMotion technology, the virtualization simulation platform was created by calling the SDK. Through the research of the simulation platform application overhead and virtual resource scheduling technology, the single communication network simulation model was modified, implementing the distributed network collaborative simulation which adapted to multiple virtual machines, providing new ideas for the mass communication network simulation system.
Technical Reference Framework For Semantic Interoperation Between Combat Simulation Systems And Command & Control Systems, Xiangzhong Xu, Zaijiang Tang, Yaxin Tan
Technical Reference Framework For Semantic Interoperation Between Combat Simulation Systems And Command & Control Systems, Xiangzhong Xu, Zaijiang Tang, Yaxin Tan
Journal of System Simulation
Abstract: Military training, equipment demonstration, war-fighting test and other applications pose great requirements on the semantic interoperation between combat simulation systems and command & control (C2) systems. The heterogeneity between combat simulation and C2 systems was analyzed from the following aspects, such as architecture, information interaction models, communication protocols and databases. Then a layered technical reference framework was proposed to solve this thorny issue in a comprehensive way, which consists of accession layer, resource layer, semantic interaction layer, service layer and application layer. Its effectiveness was demonstrated against an application use-case. Research results are helpful to make out an engineering …
Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang
Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang
Journal of System Simulation
Abstract: To fulfil the requirements for fast, easy and integrated modeling under certain operation conditions, a model composition method of scenario-driven was proposed. Starting with corresponding composition framework, traditional component models were extended through corresponding meta-model and normalization description of scenario was given. Furthermore, a full combat simulation system could be constructed quickly by realizing integrated process including three processes: scenario parse, model search and match. By preliminarily performing underwater weapon system modeling and simulation application, the result shows efficiency of this composition method.
Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang
Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang
Journal of System Simulation
Abstract: Modern military combat pays more attention to the electronic interference and anti interference, as the important component, the aircraft navigation system is one of the main objects attacked by enemy electronic jamming. In order to simulate the electronic jamming influence on navigation performance of the system, the establishment of an electronic jamming system in aircraft engineering simulator, was designed for the flight simulator interference model and statistical model frame work, and according to the integrity of the system testing and calculation results, the interference was divided into five levels, which not only specified the electrical interference, but also …
Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong
Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong
Journal of System Simulation
Abstract: To solve the growing conflict between requirements and applications in simulation/visualization, self-formation development mode was proposed: domain experts DIY by WYSWYG in a self-adapting process. VOPES (Visual Open platform for Engineering System) was briefly introduced: integrated architecture, system modeling tools, visualization tools, automatic generation, debugging, deploying, and runtime infrastructure. VOPES enables domain expert to produce distributed simulation/visualization application, no need of coding, complex program skill, hard rules like UML, HLA, DDS, etc. VOPES can be widely used in applications like mission simulation, equipment demonstration, virtual range, training, ITEM. It is especially suitable to the fast, agile, complex simulation/visualization application, …
Human Action Recognition Based On Self-Learning Feature And Hmm, Jiarui Wen, Lina Liu, Rui Ling, Shiwei Ma
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 …