Open Access. Powered by Scholars. Published by Universities.®

Numerical Analysis and Scientific Computing Commons™

Open Access. Powered by Scholars. Published by Universities.®

6,715 Full-Text Articles 15,341 Authors 3,274,408 Downloads 148 Institutions

All Articles in Numerical Analysis and Scientific Computing

Faceted Search

6,715 full-text articles. Page 204 of 317.

Research On Vibration Characteristics And Parameters Influence Of A Nonlinear Vibration Absorber, Lilan Liu, Bolin Ren, Guodong Zhu 2019 School of Mechanical and Instrumental Engineering, Xi’an University of Technology, Xi’an 710048, China;

Research On Vibration Characteristics And Parameters Influence Of A Nonlinear Vibration Absorber, Lilan Liu, Bolin Ren, Guodong Zhu

Journal of System Simulation

Abstract: The bistable nonlinear electromagnetic vibration energy harvester (BNEVEH) is used as a vibration absorber to absorb harmful vibration and transfer it into useful electric energy. The mechanical model and governing equation of the main system with BNEVEH are established. The effect of Gauss white noise intensity on large amplitude motion is analyzed by simulations. And the effect law of mass ratio and tuning frequency ratio on the vibration reduction of the main system and power generation of bistable vibration absorber under Gauss white noise excitation is analyzed from the point of vibration reduction and vibration energy harvesting. The optimal …


High-Order Reconstruction Of Maneuvering Decision-Making Process In Close Air Combat, Ya’nan Kou, Longting Jiang, Wang Dong 2019 1. Aeronautics Engineering College of Air Force Engineering University, Xi’an 710038, China;; ;

High-Order Reconstruction Of Maneuvering Decision-Making Process In Close Air Combat, Ya’Nan Kou, Longting Jiang, Wang Dong

Journal of System Simulation

Abstract: Aiming at the reconfiguration of maneuvering decision-making in air combat, an extraction model of key maneuvering decision-making points is constructed. Based on the actual aircraft flight status data, by introducing the concept of jerkiness degree in physics, four indexes of pitching Angle, yaw Angle, roll Angle and speed jerkiness, are selected to construct evaluation index system of key maneuvering decision point. By using the theory of information entropy , the relevant indexes are reduced and the comprehensive evaluation value are obtained. Then maneuvering area is divided according to time domain, the decision points are extracted, and maneuvering decision-making refactoring …


Simulation Of The Resistance Of Superhydrophobic Microchannel In Turbulent Regime, Chunxi Li, Qingze Cui, Xuemin Ye 2019 Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Minstry (North China Electric Power University), Baoding 071003, China;

Simulation Of The Resistance Of Superhydrophobic Microchannel In Turbulent Regime, Chunxi Li, Qingze Cui, Xuemin Ye

Journal of System Simulation

Abstract: VOF model and the Realizable k-ε turbulent model are used to simulate the three-dimensional flow field of superhydrophobic microchannels with longitudinal and transverse microstructures in turbulent regime, the effects of structural parameters on the resistance characteristics of superhydrophobic surface are analyzed. The results show that the superhydrophobic microchannels with longitudinal microgrooves exhibit significant reductions in drag; with the increase of the free shear area ratio and the width of the microchannel, the ratio of pressure drop increases, and the average friction factor decreases, as well as the drag reduction effect is highly significant; with the increase of …


Analyzing The Pedestrian Evacuation Efficiency In Architecture Based On Different Facilities Layout, Zhihong Li, Yanjie Wen, Wangtu Xu, Qi yue 2019 1. UDC Beijing University of Civil Engineering and Architecture, Beijing 100044, China; ;

Analyzing The Pedestrian Evacuation Efficiency In Architecture Based On Different Facilities Layout, Zhihong Li, Yanjie Wen, Wangtu Xu, Qi Yue

Journal of System Simulation

Abstract: Pedestrians escaping from the architecture are restricted by limited time and space. There are so many different exits, channels and bottleneck. Three kinds of facilities layout were designed to be initial schemes. The shortest escaping time was estimated by the different bottlenecks. Then, a safety escaping model based on the facilities layout and dynamic information was proposed, and the escaping time, area density and evacuation efficiency were analyzed by the simulation. The research indicates that by calculating and simulating the model can estimate the evacuation time for different schemes, and the result can provide some advices for facilities layout.


A Dorsal Hand Vein Extraction Algorithm For Region Of Interest, Li Qi, Jianjiang Cui, Dingyu Xue, Hongyu Geng 2019 1. School of Information Science &Engineering, Northeastern University, Shenyang 110819, China; ;2. School of Electronic and Information Engineering, University of Science and Technology, Anshan 114051, China;

A Dorsal Hand Vein Extraction Algorithm For Region Of Interest, Li Qi, Jianjiang Cui, Dingyu Xue, Hongyu Geng

Journal of System Simulation

Abstract: The rotation and translation of dorsal hand result in deviation, which brings interference during recognizing valid region when collecting dorsal hand vein image. In order to locate valid recognition area quickly, an extraction algorithm for region of interest based on maximum inscribed circle is proposed in view of the characteristics of the collected image. For the collected dorsal hand vein image, this algorithm calculates the center of the maximum inscribed circle and the center of mass, and the rotation angle of the dorsal hand is calculated. The position of the dorsal hand vein image is corrected and the recognition …


Corner Localization In Digital Images Based On Radon Transform, Xuguang Wang, Zhang Qin, Su Jie 2019 North China Electric Power University, Hebei Engineering Research Center of Simulation &Optimized Control for Power Generation, Baoding 071003, China;

Corner Localization In Digital Images Based On Radon Transform, Xuguang Wang, Zhang Qin, Su Jie

Journal of System Simulation

Abstract: Location accuracy is one of the key indexes of measuring the performance of feature point.. High location accuracy feature point detection has important implications for the applications such as 3D reconstruction, motion estimation, target tracking and recognition, image registration, etc. A corner location algorithm based on Radon transform is proposed.Edge binary images are obtained with traditional method first, ideal straight lines and curves are extracted then, potential corner locations are calculated next, fake corners are rejected finally. Experimental results on both simulation and real images show that, this method performs better than the existing methods on interest point localization …


Simulation Analysis Of Head And Neck Injuries For Aircrew Escape System During Traction Rescue, Bohao Xing, Qianxing Zhou, Xingwei Wang, Yuan Yue 2019 1. School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;;

Simulation Analysis Of Head And Neck Injuries For Aircrew Escape System During Traction Rescue, Bohao Xing, Qianxing Zhou, Xingwei Wang, Yuan Yue

Journal of System Simulation

Abstract: The biomechanical response of human head and neck was studied to safeguard the helicopter aircrew in the traction escape process. A finite element model of human head and neck was established based on the Chinese pilot’s stature standard. The simulation and experiment results were compared to verify the validity of the model. The simulations under different period overload accelerations obtained from manikin traction aircrew escape experiment were performed to analyze the injuries of human head and neck in the processes of one shoulder traction and both shoulders traction. By an analysis of the head impact and acceleration, the simulation …


Simulation Research On Damage Identification Of Simply Supported Beam Based On Wavelet Packet Energy Method, Xijun Liu, Xiankun Tao, Suxia Zhang 2019 School of Mechanical Engineering,Tianjin University, Tianjin 300350, China;

Simulation Research On Damage Identification Of Simply Supported Beam Based On Wavelet Packet Energy Method, Xijun Liu, Xiankun Tao, Suxia Zhang

Journal of System Simulation

Abstract: A finite element model of simply-supported beam is built by ANSYS;the displacement response of the beam is used to make wavelet packet analysis with MATLAB to get the curvature difference of WP-E (wavelet packet energy);and the studies on the effects of different parameters on damage recognition results of simple beam bridge are carried out, such as damage locations, damage level, measuring point density and speed of moving loads. For the condition of less measuring points, a method of arranging the measuring points by two steps is proposed. The normalized curvature difference of WP-E is made to study the …


Jammer Placement Algorithm Based On Particle Swarm Optimization, Fang Fang, Chunming Ye, Haibo Liu 2019 1. Anhui University of Chinese Medicine, Hefei 230037, China;;

Jammer Placement Algorithm Based On Particle Swarm Optimization, Fang Fang, Chunming Ye, Haibo Liu

Journal of System Simulation

Abstract: A novel jammer placement algorithm based on particle swarm optimization is proposed to solve the problems of nodes’ mobility and restrictions on placement areas in ad-hoc network. There are three steps in this algorithm: network simulation, jamming simulation, and optimization. The algorithm simulates the network communication process and movement of nodes with discrete simulation method. Simple particle swarm optimization is applied to compute the exact coordinates of jammers. Experiment results show that this algorithm is good at jamming network nodes moving in different ways. The algorithm has stable performance with varying conditions such as different placement areas, jamming …


Fire Emergency Evacuation Simulation Of Vertical Ship Lift, Jianping Wang, Meiru Wang, Chen Shu, Chengyou Liu, Li Zhi 2019 1. Hubei Key Laboratory of Hydropower Project Construction & Management (China Three Gorges University), Yichang 443002, China;;2. College of Economics and Management, China Three Gorges University, Yichang 443002, China;;

Fire Emergency Evacuation Simulation Of Vertical Ship Lift, Jianping Wang, Meiru Wang, Chen Shu, Chengyou Liu, Li Zhi

Journal of System Simulation

Abstract: In order to analyze the fire evacuation efficiency of vertical ship lift, the influence of population characteristics on evacuation is analyzed quantitatively from three aspects, such as age structure, population density and flow velocity. According to the emergency evacuation path of vertical ship lift, the three-stage evacuation time is divided into three parts. In order to obtain fire evacuation time, the model of vertical ship lift with the passenger ship is established and parameters of evacuation time are set up by using the simulation technology. The actual case of the Three Gorges ship lift shows:1) the evacuation …


Human Re-Identification Based On Part Segmentation, Jiang Hua, Zhang Liang 2019 Tianjin Key Lab of Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;

Human Re-Identification Based On Part Segmentation, Jiang Hua, Zhang Liang

Journal of System Simulation

Abstract: Human re-identification is a difficult problem to solve in process of video analysis of non-overlapping multi-camera surveillance system. A new algorithm of human re-identification is proposed on the basis of human part segmentation. Based on the depth of bone points to achieve the human body segmentation, the optimal key frame is selected by using the scoring strategy for all parts of the same human multi-frame image segmentation; the different weights for the global color feature and the HOG feature are assigned; all the characteristics to establish a human target model are combined; and the EMD (Earth Mover’s …


Pshev Cold Start Emission Simulation Based On Electric Heated Catalyst Pre-Heating, Deng Tao, Haoyuan Yu, Zhifei Li, Haixin Tan 2019 School of Mechatronics & Automotive Engineering, Chongqing Jiaotong University, Chongqing 400074, China;

Pshev Cold Start Emission Simulation Based On Electric Heated Catalyst Pre-Heating, Deng Tao, Haoyuan Yu, Zhifei Li, Haixin Tan

Journal of System Simulation

Abstract: In order to reduce the emissions of the plug-in series hybrid electric vehicle (PSHEV) during the cold start phase, a vehicle model on PSHEV is established and a dynamic model of electrically heated catalyst system (EHCS) based on optimization and control strategy of engine start-stop is built. The PSHEV energy management control strategy based on EHCS preheating is proposed. The influence of different pre-heating power on EHCS temperature is simulated. By comparing SOC value of the control strategy with the original control strategy; and comparative analysis of cold start emissions of three elements catalyst under three strategies of pre-heating, …


Multi Objective Flexible Load Scheduling In Smart Home Based On Grey Wolf Algorithm, Bao Yi, Dai Bo, Zhihua Wang, Wanliang Wang 2019 1. Hangzhou Telek Technology Co., Ltd., Hangzhou 310012, China;;

Multi Objective Flexible Load Scheduling In Smart Home Based On Grey Wolf Algorithm, Bao Yi, Dai Bo, Zhihua Wang, Wanliang Wang

Journal of System Simulation

Abstract: A three level electricity price model is designed based on the electricity consumption. A comfort model of multi parameters is designed for optimizing the grid load control of temperature and the humidity, light intensity and human activity. Grey wolf algorithm is used to solve the multi-objective problem. The grey wolf algorithm has its superiority in solving high dimensional and multi peak of complex function problems. Theoretical and experimental analysis shows that the grey wolf algorithm in accuracy and stability is better than particle swarm optimization algorithm and differential evolution algorithm. The simulation results show that the proposed algorithm can …


Evaluation Of Stealth Aircraft Approaching Support Jamming Performancefrom Detection Probability, Bao Lei, Chunyang Wang, Huiyong Zeng, Bai Juan 2019 Air Force Engineering University, Air and Missile Defense College, Xi’an 710051, China;

Evaluation Of Stealth Aircraft Approaching Support Jamming Performancefrom Detection Probability, Bao Lei, Chunyang Wang, Huiyong Zeng, Bai Juan

Journal of System Simulation

Abstract: Aiming at the problem of how to construct an effective model to evaluate the reasonableness of detection performance when a radar detects a third-generation aircraft covered by an approaching support jamming performance of stealth aircraft, a stealth aircraft jamming model based on diving to the near support track is proposed. After calculating the aircraft attitude angle, the time-varying dynamic RCS series are extracted. Using Swerling IV distribution, the characteristics of radar instantaneous detection probability time-varying in penetration jamming between normal flight and stealth aircraft are studied and compared. Simulation results show that the radar detection probability can be reduced …


Airplane Pre-Conditioning Optimizing Control Based On Large-Scale System Theory, Xiuyan Wang, Gewen Zhang, Zhou Chen, Zongshuai Li, Yanmin Liu 2019 1. School of Electronics Information and Automation, Civil Aviation University of China, Tianjin 300300, China;;2. Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;

Airplane Pre-Conditioning Optimizing Control Based On Large-Scale System Theory, Xiuyan Wang, Gewen Zhang, Zhou Chen, Zongshuai Li, Yanmin Liu

Journal of System Simulation

Abstract: Aiming at airplane pre-conditioning optimizing control, a modified OPBM (Output Predicition and Balance Method) was introduced. Taking Boing 737 airplane pre-conditioning as the research subject, the decentralized identification algorithm was adopted for establishing the airplane pre-conditioning large-scale system model; the optimal objective considering the system energy consumption, air conditioning area human comfort, and air quality was proposed; and the global system optimization operating condition model was constructed. The OPBMLF with local feedback was designed to optimize globally airplane pre-conditioning system model. Matlab was used for achieving simulation research, and the results was compared with the real data. The results …


Review Of Simulation Model Validation Methods, Li Wei, Yuchen Zhou, Shenglin Lin, Ma Ping, Yang Ming 2019 Control and Simulation Center, Harbin Institute of Technology, Harbin 150001, China;

Review Of Simulation Model Validation Methods, Li Wei, Yuchen Zhou, Shenglin Lin, Ma Ping, Yang Ming

Journal of System Simulation

Abstract: Modeling and simulation has become an important way to cognize and research objective world, and the credibility of simulation models is the premise and basics for carrying out simulation activities. The ever-increasing complexity of the simulation objects and demands of simulation applications for users lead to a great challenge in validation of complex simulation model, which characterize a variety of complex features. This paper aims to summarize the concepts and development of simulation model validation, classify existing validation methods, analysis the applicable conditions of these methods and provide a brief review of some new validation methods. Furthermore, some emerging …


Credible Optimum Selection Of Guidance System Simulation Based On Entropy Weight Vikor Method, Wenguang Yang, Yunjie Wu 2019 1. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China; ;2. College of Science, North China Institute of Science and Technology, Beijing 101601, China;

Credible Optimum Selection Of Guidance System Simulation Based On Entropy Weight Vikor Method, Wenguang Yang, Yunjie Wu

Journal of System Simulation

Abstract: As the core component of the missile system, the guidance system plays an increasingly important role in the design of missile system. In order to improve the accuracy of the guidance system, this paper obtains the experimental data under a number of parameter design schemes by means of simulation experiments. The problem of simulation credibility verification of guidance system is transformed into multi-attribute decision-making optimization problem, and a parameter optimization method of guidance system based on improved VIKOR method is designed. The improved VIKOR method overcomes the phenomenon of rank reversal and ensures that the optimal final compromise solution …


Simulation Of Helicopter Anti-Submarine Route Planning, Zhu Zhi, Yonglin Lei, Yifan Zhu 2019 College of Systems Engineering, National University of Defense Technology, Changsha 410073, China;

Simulation Of Helicopter Anti-Submarine Route Planning, Zhu Zhi, Yonglin Lei, Yifan Zhu

Journal of System Simulation

Abstract: Simulation of helicopter anti-submarine tactics not only requires pure theory analysis, but also needs an efficient simulation system support. Current anti-submarine tactics in the search phase include the use of dipping sonar and sonobuoys. A simulation case is designed based on equipment on service; the evaluation of above tactics on helix square, parallel round, and line spread using dipping sonar is presented. The tactics on the circle, square, and triangle using sonobuoys are evaluated as well. It shows that the proposed method can improve the efficiency of simulation application development, so as to meet the requirements of simulation-based military …


Analysis Of Initialization Variables Selection In Multi-Domain Modeling, Guangyuan Li 2019 Chongqing University of Arts and Sciences, Chongqing 402160, China;

Analysis Of Initialization Variables Selection In Multi-Domain Modeling, Guangyuan Li

Journal of System Simulation

Abstract: In multi-domain modeling, the problem of initial consistency must be settled to solve differential algebraic equations (DAEs). Structural analysis is capable of verifying the initial consistency, solving some initial values and determining the degree of freedom, but not capable of affirming the variables that need to be initialized. If improper selection is made for the initiation variables, it will become low efficient and even fail to solve and simulate the model. After analyzing the initial consistency of DAEs, a strategy based on DM decomposition is proposed for selecting the initialization variables. The method decomposes the system into two …


Credibility Evaluation Method Of Small Sample Data Based On Cluster Cloud Model, Jianmin Wang, Yunjie Wu 2019 1. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China; ;

Credibility Evaluation Method Of Small Sample Data Based On Cluster Cloud Model, Jianmin Wang, Yunjie Wu

Journal of System Simulation

Abstract: In practical engineering, the system credibility evaluation with small amount of data and no evaluation criteria has always been a difficult problem for engineers. Aiming at this problem, a small sample data credibility evaluation method combining clustering method and cloud model is proposed. The clustering method is used to calculate the cluster center value for the small sample, and the cloud model is established based on this. The expanded value for small sample data is generated by the cloud model. The credibility of small sample data can be calculated according to the confidence distribution of cloud drops. It can …


Digital Commons powered by bepress