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Articles 961 - 990 of 1494
Full-Text Articles in Systems Science
Research And Implementation Of Egr Performance Evaluation For Turbocharged Diesel Engine, Xianghuan Zu, Yinyan Wang, Chuanlei Yang, Jianwei Du, Jialun Wang
Research And Implementation Of Egr Performance Evaluation For Turbocharged Diesel Engine, Xianghuan Zu, Yinyan Wang, Chuanlei Yang, Jianwei Du, Jialun Wang
Journal of System Simulation
Abstract: To solve the optimization of turbocharged diesel engine combustion and emissions performance for different EGR rate under different working conditions, the operation parameters of the diesel engine under different EGR rate was obtained through experiment at first; then the specific fuel consumption, NOx, soot and cylinder pressure were selected as decision targets and the evaluation model for turbocharged diesel engine performance under different EGR rate was established based on multi-objective grey decision, finally optimum EGR scheme was achieved. A simulation platform for EGR performance evaluation was designed by MATLAB which simplifies the modeling process and improves the …
Distributed Power Emergency Rescue Perception And Cooperative Information Interaction Technology, Xiaojun Xie, Hanchen Lu, Ruoxin Shi
Distributed Power Emergency Rescue Perception And Cooperative Information Interaction Technology, Xiaojun Xie, Hanchen Lu, Ruoxin Shi
Journal of System Simulation
Abstract: An emergency rescue technology for modern vehicle was proposed based on the implementation process of positioning, communication and task. The key subsystems of information processing and multi-link message in the rescue system were developed. The cooperative interaction method and technical scheme of emergency command system were based on multi-link communication. To improve the communication effectiveness between the emergency command center and emergency rescue vehicles under harsh conditions, the problems of short message communication and vehicle data transmission were solved by establishing a framework for directing side and the vehicle side. Design and implementation of the system through the field …
Modeling And Simulation Of Radar Networking Anti-Stealth Based On The Detection Probability, Bin Chen, Chuangming Tong, Ximin Li
Modeling And Simulation Of Radar Networking Anti-Stealth Based On The Detection Probability, Bin Chen, Chuangming Tong, Ximin Li
Journal of System Simulation
Abstract: For the scene of stealth target penetration against radar network, an evaluation model of detection effectiveness is established by taking the detection probability of the netted radar as an evaluation index. Based on the target's Radar Cross Section (RCS) data, the relationships among the false alarm probability, detection probability and signal to noise ratio are analyzed. A method using signal detection probability of the radar network is proposed with the Rank “K” principle of the fusion center. The RCS of stealth target is analyzed utilizing physical optics and method of equivalent currents. The detection probability of radar …
Simulation Of Influence Of Lightning On Internal Electromagnetic Environment Of Computer, Gaihong Du, Yangmeng Tian, Caixia Wang, Hongwei Wang
Simulation Of Influence Of Lightning On Internal Electromagnetic Environment Of Computer, Gaihong Du, Yangmeng Tian, Caixia Wang, Hongwei Wang
Journal of System Simulation
Abstract: Through XFDTD software simulating strong lightning electromagnetic pulse of 50KV lightning electric field strength, rising edge about 50ns, and pulse width about 2000ns coupled with a desktop computer, the curves of the coupled electric field with time and the curves of the energy density with time at several typical locations in the chassis are obtained; the shielding effectiveness of different locations inside the computer is analyzed. Simulation results suggest that the electromagnetic field strength produced in the chassis has no damage to the computer node while coupling energy generated in the hole is large in comparison with the threshold …
Hybrid Rzf Precoding Algorithm For Massive Mimo System, Bin Xie, Shumin Xie, Shurui Liu
Hybrid Rzf Precoding Algorithm For Massive Mimo System, Bin Xie, Shumin Xie, Shurui Liu
Journal of System Simulation
Abstract: In view of the high system complexity and high cost of the multi-user Massive MIMO system based on the traditional full digital precoding, a hybrid analog and digital RZF precoding is proposed. Based on the consideration of the channel noise, the inter-user interference and the system structure, the analog precoding matrix is sectionally designed with the combination of MRT precoding and RZF precoding, and for the digital part, a low dimension RZF precoding is used on the basis of the optimized channel matrix. After the optimization design, both the number of RF chain and the dimension of the digital …
Distributed Estimation Algorithm For Multi-Dimensional Multi-Choice Knapsack Problem, Tan Yang, Liu Zhang, Zhou Hong
Distributed Estimation Algorithm For Multi-Dimensional Multi-Choice Knapsack Problem, Tan Yang, Liu Zhang, Zhou Hong
Journal of System Simulation
Abstract: As it is difficult to realize local optimization of the Multidimensional Multiple-choice Knapsack Problem (MMKP), the Estimation of Distribution Algorithms (EDA) is applied to optimize the MMKP. In order to improve the local optimization ability of EDA, value weight factors of items for selection are built to improve the EDA initial model and probabilistic model updating methods. The impact of the extreme effects on the algorithm optimization process is balanced to overcome the defect that the local optimization ability of the traditional EDA is weak. A new non-feasible solution repair mechanism is adopted to maintain the facilitation of machine …
Sensorless Control Of Permanent Magnet Synchronous Motor With Improved Sliding Mode Observer, Li Jie, Wang Yan, Zhicheng Ji, Dahu Yan
Sensorless Control Of Permanent Magnet Synchronous Motor With Improved Sliding Mode Observer, Li Jie, Wang Yan, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: With the purpose of improving the performance of sensorless control system of permanent magnet synchronous motor (PMSM), an improved sliding mode observer based on stator resistance online identification is proposed. These ctional hyperbolic tangent function is adopted as switching function, combined with variable sliding mode gain to weaken the high frequency chattering. Through the use of Lyapunov stability theory, the stator resistance online identification is adapted for improving the estimation accuracy of observer. Fractional order phase-locked loop is employed to estimate the rotor position and speed information from observed back EMF so that computing complexity caused by traditional phase …
Thermodynamic System Analysis Of A New Double-Bladder Accumulator, Zhao Wei, Ye Qian
Thermodynamic System Analysis Of A New Double-Bladder Accumulator, Zhao Wei, Ye Qian
Journal of System Simulation
Abstract: A new double-bladder accumulator is introduced to improve the efficiency of bladder accumulator, and the dynamic equations for the new type accumulator are established. Based on the simulation results of temperature and pressure, the generalized Maxwell model of double-bladder accumulator is deduced, and the concept of thermodynamics spring is put forward. On account of simulation results, it shows that the new double-bladder accumulator has better operational efficiency and losses coefficient than that of the old type. The internal relations among the generalized Maxwell model, thermodynamics spring and operating parameters are analyzed with the purposes of upgrading design and proper …
Design Of Anti -Windup Controller For Srmdirect Instantaneous Torque System, Xiaofei Qin, Liu Jie, Li Feng
Design Of Anti -Windup Controller For Srmdirect Instantaneous Torque System, Xiaofei Qin, Liu Jie, Li Feng
Journal of System Simulation
Abstract: In the direct instantaneous torque control system of switched reluctance motor, there is a nonlinear saturation in the speed outer loop controller. The integral control link of the controller will accumulate the error and increase the error gradually, resulting in the saturation effect of the controller and reducing the performance of the system. In this regard, an anti- windup adaptive PID controller is proposed on the basis of the traditional speed controller. This method integrates the input saturation error of controller and adjusts the integral term of controller by adaptive coefficient, so that it can quickly desaturation when the …
Visual Analysis Of Literature Review Of Phase Space Reconstruction, Meng Li, Yeping Bi
Visual Analysis Of Literature Review Of Phase Space Reconstruction, Meng Li, Yeping Bi
Journal of System Simulation
Abstract: The primary object of the paper is to reveal the development process and prospect of phase space reconstruction theory. The technique applied is referred as CiteSpace Ⅲ, a visualized analysis software for citation. The research method of literature metrology was used to classify the fifteen hundred papers from the Web of Science platform related with “phase space reconstruction” into different priorities according to time distribution, spatial distribution, citation and author distribution. All results were displayed in figures and tables. The hot spot and trend of phase space reconstruction were discussed based on the keywords co-occurrence graph and keywords time …
Memcapacitor Model Based On Memristor, Zhaohui Gan, Yuxin Wu, Jiang Min, Shiying Zhang
Memcapacitor Model Based On Memristor, Zhaohui Gan, Yuxin Wu, Jiang Min, Shiying Zhang
Journal of System Simulation
Abstract: After physical model discovery of memristor in HP lab, the researchers put forward the concept of memcapacitor according to circuit theory. However, the physical object of the memcapacitor has not been found so far. In order to research the memcapacitor, researchers often use other components and circuits to simulate a memcapacitor. After analyzing the existing model of memcapacitor, a new nonlinear transformation method is proposed to transform a memristor into a memcapacitor, by which a nonlinear model of memcapacitor based on the memristor is constructed. The Pspice simulation experiments showed that the model successfully simulated the basic characteristics of …
Distributed Modeling And Simulation Method Of Equipment Support System Based On Multi Agent, Lili Yin, Kou Li, Wenhui Fan
Distributed Modeling And Simulation Method Of Equipment Support System Based On Multi Agent, Lili Yin, Kou Li, Wenhui Fan
Journal of System Simulation
Abstract: The role of equipment support system becomes more and more important. In view of its large scale and high complexity, it is of great practical significance to study the equipment support system by using distributed modeling and simulation technology. A simulation modeling method of equipment support system based on multi-Agent technology is proposed. The type and function of Agent in the system is designed, and the interaction between them is described. The system architecture based on multi-Agent distributed modeling and simulation is presented. Distributed prototype system of equipment support system based on multi-Agent is designed and implemented by open-source …
Solid-Liquid Two-Phase Flow Simulation Of Hydrodynamic Suspension Polishing, Shengwei Zhu, Lihui Zhang, Hong Tao, Zhang Cheng
Solid-Liquid Two-Phase Flow Simulation Of Hydrodynamic Suspension Polishing, Shengwei Zhu, Lihui Zhang, Hong Tao, Zhang Cheng
Journal of System Simulation
Abstract: According to the new method of hydrodynamic suspension polishing, CFD software is used to simulate the polishing to obtain the distribution of fluid pressure and the velocity of the particles impacting on the work piece surface under different working conditions by the method of orthogonal design. The simulation results show that the rotational speed ω of the disc is the main factor affecting the dynamic pressure and the abrasive particle velocity, while the machining gap H is the secondary factor,and the least influence factor is the polishing liquid concentration φ. The optimal design parameters are: ω=1500 r/min, …
Point Cloud Segmentation Method Of Maize Ear, Weiliang Wen, Xinyu Guo, Yang Tao, Deda Zhao, Miao Teng, Hongyu Zhu, Chengyu Dong
Point Cloud Segmentation Method Of Maize Ear, Weiliang Wen, Xinyu Guo, Yang Tao, Deda Zhao, Miao Teng, Hongyu Zhu, Chengyu Dong
Journal of System Simulation
Abstract: Three-dimensional (3D) segmentation of maize ear is the fundamental research of 3D ear phenotype. A method of 3D segmentation for maize ear was proposed in this paper. Firstly, 3D point cloud of maize ear was acquired by using SmartScan 3D scanner. Then the point cloud was simplified by point cloud resampling to improve the efficiency of subsequent algorithm. And a contraction transformation was employed to increase the distance of neighboring grains in Euclidean space by estimating the normal of each point through k-neighbor algorithm. Finally, the point cloud of maize ear was segmented by Euclidean clustering. Results showed that …
Monitoring Information Visualization For High-Filling Loess Project, Liping Zheng, Chen Wei, Ting Liao, Lu Chang
Monitoring Information Visualization For High-Filling Loess Project, Liping Zheng, Chen Wei, Ting Liao, Lu Chang
Journal of System Simulation
Abstract: The construction of high-filled loess project facessome engineering and technical challenges,such as large and complex earth excavation and earth backfilling operations. According to this situation, this paper presents a dynamic visualization methods for high-filled project based on 3D GIS. By establishing the model of high-filled loess, comparative analysis and visual analysis, dynamic simulation of high-filled loess project, visualization and analysis of Dig-Fill process and monitoring information arerealized. The results show that this visualization method can directly and accurately display the construction process, help decision makers master construction information and process.
Gait Cpg Adjustment For A Quadruped Robot Based On Hopf Oscillator, Haidong Xu, Gan Su, Ren Jie, Binrui Wang, Yinglian Jin
Gait Cpg Adjustment For A Quadruped Robot Based On Hopf Oscillator, Haidong Xu, Gan Su, Ren Jie, Binrui Wang, Yinglian Jin
Journal of System Simulation
Abstract: CPG (central pattern generator) plays an important role for rhythm motion of the mammals. According to gait characteristics and kinematic relationship of hound, a full symmetric CPG network was built by considering the structure features of quadruped robot. Hopf oscillators model were chosen as core neuron models of CPG network, and the rotation matrix was used to connect four oscillators. After transformation by mapping function, output signals of CPG network were used to control joint angle of the virtual prototype robot. Quick and smooth transition between walk gait and trot gait were achieved by adjusting the parameters of CPG …
New Model For Mobile Indoor Maps Design And Expression, Deng Chen, Jiangpeng Tian, Xia Qing
New Model For Mobile Indoor Maps Design And Expression, Deng Chen, Jiangpeng Tian, Xia Qing
Journal of System Simulation
Abstract: Indoor maps are the basis and information carrier of indoor location services, and the transmission efficiency of the map information would be affected by the design of indoor maps. In order to improve the effect of indoor map symbol design, enrich and innovate the indoor map expression, a new model of indoor map design and expression is studied on the basis of summarizing and drawing lessons from the current research results. Firstly, the methods for classifying and grading the map elements, and the ideas and application values of the method for three dimensional non-photorealistic symbol design are summarized …
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: With the aim of improving the performance of the vector controlled induction motor system, a novel control method which combines variable structure PID speed control with online identification of rotor resistance based on model reference adaptive system (MRAS) is proposed. The rotor resistance is identified by self-adaptive adjustment in the model reference adaptive system based on the instantaneous reactive power. Given that the parameters can not change on line and the integral saturation phenomenon often exists in traditional PID speed regulator, a variable structure PID speed controller is designed by integrating anti-windup technology with fuzzy theory based on traditional …
Key Technologies Of Precaution And Prediction Of Abnormal Spatial-Temporal Trajectory: A Review Of Recent Advances, Gongda Qiu, He Ming, Yang Jie, Yuting Cao, Jihong Sun
Key Technologies Of Precaution And Prediction Of Abnormal Spatial-Temporal Trajectory: A Review Of Recent Advances, Gongda Qiu, He Ming, Yang Jie, Yuting Cao, Jihong Sun
Journal of System Simulation
Abstract: The ex-post disposition of a major incident, which is expected to transform into prediction and precaution of abnormal behavior, is increasingly unable to meet the urgent needs of the society.Therapid development and popularization of sensor network and positioning technology lay the foundation for mining spatial-temporal trajectory data. With the key objective of prediction and precaution of abnormal trajectory based on big data mining, the future research directions and prospects on trajectory clustering and recognitionareanalyzed, discussed and elaboratedinthis paper.Temporal trajectory prediction applied in prediction and precaution of abnormal spatial-temporal trajectory is also presented, providing a reference for further research on …
Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks, Su Cheng, Wentong Wang, Shibao Yang, Xv Linlin, Xinan Tang
Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks, Su Cheng, Wentong Wang, Shibao Yang, Xv Linlin, Xinan Tang
Journal of System Simulation
Abstract: Defenses approach against DDoS(Distributed Denial of Service) attacks is currently an important hot issues. We propose a new efficient defenses approach which adopts a detection system based on metadata analysis to identify the packages of DDoS attacks. The flow control rules are formed based on the summarized experience data. ACL (Access Control List) is applied through inline devices (firewalls and load balancers) or divider to limit rate, clean flow or drop package. 10Gbps bandwidth HTTP requests, which contain malicious DDoS attacks packages, can be detected and cleaned completely in line-rate speed. We especially summarize th traffic characteristics …
Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr, Weixin Zheng, Jinyuan Jia
Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr, Weixin Zheng, Jinyuan Jia
Journal of System Simulation
Abstract: Considering the weak rendering ability of web browser, the authenticity and aesthetics of Web3D rendering are always hot topics.In particular, the realization of PBR in the web-side and even dynamic editable are difficult.The realization and dynamic edit of PBR in the web end are especially difficult. Based on the problem mentioned, this paper presents a web-based lightweight real-time rendering algorithm with authenticity and high quality based on the PBR algorithm, which simplifies the complex calculation steps of the algorithm and reduces the computational complexity for rendering. The LPM (Lightweight Progressive Mesh) algorithm is reused to simplify the model file …
Two Image Watermarkingmethodsbased On Compressive Sensing, Yidi Miao, Lü Ju, Xiumei Li
Two Image Watermarkingmethodsbased On Compressive Sensing, Yidi Miao, Lü Ju, Xiumei Li
Journal of System Simulation
Abstract: As an emerging sample theory, compressive sensing attracts wide attention because it breaks through the Nyquist sampling theorem. , Two different methods of watermark embedding and extraction are presented by measuring the carrier image and watermark image respectively based on compressive sensing. Moreover, the attack tests, such as the Gaussian noise, pepper and salt noise, filtering, compression, and cropping, are implemented to watermarked images. Experiment results show that although the two different methods for image watermarking have different processing procedure, both can guarantee the robustness and security of embedded digital watermark.
Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid, Bingchuan Jiang, Wan Gang, Li Feng, Zhang Wei, Zhenfa Yang
Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid, Bingchuan Jiang, Wan Gang, Li Feng, Zhang Wei, Zhenfa Yang
Journal of System Simulation
Abstract: According to the requirements of specific application of robotic localization and navigation, a spatial modeling method of the robotic navigation map with ultra-high resolution volumetric grid model is proposed. The geographic spatial three-dimensional grid model is combined with the robotic navigation map and the consistency of spatial span, grid cell and data organization is analyzed. The characteristics of the robotic navigation map, the source and classification of the data, and the difference and relationship between SLAM are analyzed in detail. The robotic spatial data sets are discretized with the ultra-high resolution volumetric grid units as the data organization units. …
Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle, Han Pu, Ting Zhang
Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle, Han Pu, Ting Zhang
Journal of System Simulation
Abstract: A multiple model predictive control strategy based on offline linear model is proposed for controlling the ORC-based WHRSs (waste heat recovery systems). The proposed control strategy is described for a wide operation region of the ORC system. A switching mechanism considering both instant output errors of each model and error accumulation is applied for the switch of local controllers in different operation regimes. Simulation results demonstrate that the proposed method can effectively regulate the evaporating pressure and the superheating temperature for the ORC-based WHRS throughout a wide operation region.
Fault Diagnosis Model Of Circuit Breaker Based On Sparse Representation And M-Elm, Weihua Niu, Guishu Liang, Zhao Peng
Fault Diagnosis Model Of Circuit Breaker Based On Sparse Representation And M-Elm, Weihua Niu, Guishu Liang, Zhao Peng
Journal of System Simulation
Abstract: In order to improve the deficiencies of the conventional methods used to evaluate the mechanical properties of circuit breaker, a new circuit breaker diagnosis model based on sparse representation and M-ELM (Memetic-Extreme Learning Machine) is constructed. Auxiliary mark motion on the pull rod or shaft is recorded by a high speed camera when the circuit breaker is open or close. The motion trajectory is acquired through sparse representation and mechanical parameters, such as open and close velocity, are calculated according to the travel-time curve of the circuit breaker. With mechanical parameters characteristic values being inputs of M-ELM, fault …
Bi-Layered Network Model Of Command Information System Based On Task Flow, Cui Qiong, Jianhua Li, Haodan Ran, Mingli Nan
Bi-Layered Network Model Of Command Information System Based On Task Flow, Cui Qiong, Jianhua Li, Haodan Ran, Mingli Nan
Journal of System Simulation
Abstract: As the monolayer and static network model can not reflect the hiberarchy and task property of command information system, a bi-layered network model of command information system based on task flow is established. The dynamic operation mechanism and layered network structure are descripted on the basis of task、structure and function of the system. The bi-layered network consisting of communication network and function network is defined based on the task property and layered network theory. The simulation takes the joint air defense operation command information system as an example and the results demonstrate the effectiveness of the model. The proposed …
Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method, Yuanfei Zhu, Sixiang Zhang, Zhou Wei, Xiaochen Wang, Zhidong Li
Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method, Yuanfei Zhu, Sixiang Zhang, Zhou Wei, Xiaochen Wang, Zhidong Li
Journal of System Simulation
Abstract: In order to accurately segment the multi-objective image whose objective area is too small, and the background gray value is similar to the objective, a threshold segmentation algorithm based on statistical curve difference method is proposed. The mountain model of multi-objective gray image is established and the gray image is normalized. The number of connected area is counted by threshold division. The statistical curve is plotted with the horizontal coordinate being the gray level with equal interval, and the vertical coordinate being the counting result. The threshold point is the point where the difference value of the statistical …
Performance Analysis Of Digital Refocusing Process Based On Light Field Imaging, Suping You, Yucheng Lu, Zhang Wei, Yang Bo
Performance Analysis Of Digital Refocusing Process Based On Light Field Imaging, Suping You, Yucheng Lu, Zhang Wei, Yang Bo
Journal of System Simulation
Abstract: Digital refocusing is one of the important properties of light field imaging, and the analysis of its performance has important reference value for the study of light field imaging. In this paper,two different digital refocusing algorithms based on the microlens array light field camera (LFC) in spatial and frequency domain are presented. We study the influences of different domains, interpolation methods and sample radius in digital refocusing algorithm on image quality and computation speed. And we yield a tradeoff between image quality and time consumption in two domains. Experiment results suggest that the two algorithms can achieve digital refocusing …
Survey On Parallel Collision Detection Algorithms, Fuchang Liu, Shuangjian Wang, Zhigeng Pan, Jinrong Wang
Survey On Parallel Collision Detection Algorithms, Fuchang Liu, Shuangjian Wang, Zhigeng Pan, Jinrong Wang
Journal of System Simulation
Abstract: The demand for real-time collision detection is increasing in different applications. Exploiting the parallel computing capability of multi-core CPUs and GPUs to accelerate the speed of collision detection algorithms has attracted abroad attention. This paper reviews the development history of collision detection algorithms and classified the existing algorithms from multiple perspectives. Moreover, we analyze the strengths and weaknesses of more than ten representative parallel collision detection algorithms based on multi-core CPUs and GPUs from the aspects of the scalability, memory consumption and workload balancing. Finally, the problem of present parallel collision detection research and potential direction of following research …
Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data, Wanxian Guan, Wanpeng Li, Ge Lin, Huagen Wan
Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data, Wanxian Guan, Wanpeng Li, Ge Lin, Huagen Wan
Journal of System Simulation
Abstract: In recent years, urban mobile augmented reality has important application prospects. However, with the large-scale scenes in the cities, how to collect and reasonably manage and organize as well as efficiently use the big data sets has become an important issue for the performance of mobile augmented reality. To solve this problem, this paper proposed an urban mobile augmented reality method based on the free organization of multi-modal data, with the application scenario of urban streetscape enhancement. The proposed method takes the multi-modal data as the centric context and aims at how to acquire and process raw data effectively, …