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Articles 3391 - 3420 of 4209
Full-Text Articles in Computer Engineering
Application Of Constraint Force Equation Methodology In Aircraft Stage Separation Dynamics Simulation, Yongji Wang, Bangbang Li, Liu Lei
Application Of Constraint Force Equation Methodology In Aircraft Stage Separation Dynamics Simulation, Yongji Wang, Bangbang Li, Liu Lei
Journal of System Simulation
Abstract: The separation process of two-stage aircraft can be divided into three periods: lock-up period, constraint period and detachment period. The guide pins have constraint on two stages, which permit only translation in X-axis direction. To avoid the complex force analysis, the guide pins can be regarded as a joint of one degree of freedom. By adding the constraint and freedom equations to traditional separation dynamics equations, a dynamics model based on constraint force equation (CFE) methodology was built. The constraint force and moment can be obtained by solving constraint force equations. The constraint force equation (CFE) methodology was …
Facial Expression Synthesis Using Mals-Based Bilinear Factorization Model, Jiaci Guo, Shuling Dai
Facial Expression Synthesis Using Mals-Based Bilinear Factorization Model, Jiaci Guo, Shuling Dai
Journal of System Simulation
Abstract: Study on the facial expression synthesis is a constructive and creative subject in the field of virtual reality technology. The bilinear model is used for facial expression synthesis by separating the identity factor and the expression factor. The translation procedure in the bilinear model always requires a repetitive computation of matrix inverse operations to reach the identity factor and the expression factor. This computation may be instable when the observation data has the correlation or noisy information. In order to increase the stability of the bilinear model for expression synthesis, the modified iterative least square (MALS) regression is introduced …
Encoder Fault Detection And Fault Tolerant Control Of 3d Stage Wire System Based On Fdre, Li Wei, Zhenfu Ge, Fuyuan Shen, Jianxing Gong
Encoder Fault Detection And Fault Tolerant Control Of 3d Stage Wire System Based On Fdre, Li Wei, Zhenfu Ge, Fuyuan Shen, Jianxing Gong
Journal of System Simulation
Abstract: Aimed at the problem of encoder fault of 3D stage wire system, combined with LADRC, two kinds of fault tolerant control strategiesare presented based on fault diagnosis reliability evaluation (FDRE) to prevent the spread of fault effects in the system and causing accidents. Based on this, the soft and hard smooth transition soft redundant switching mechanism is designed. The simulation results show that the control strategy can ensure encoder fault detection in a timely and reliable manner, and effectively improve the safety and reliability of 3D stage wire system.
Serious Game Human-Computer Interaction Design For Rehabilitation Training, Jiajia Wu, Liu Zhen, Huihuang Xu, Tingting Liu, Wang Jin, Yanjie Chai
Serious Game Human-Computer Interaction Design For Rehabilitation Training, Jiajia Wu, Liu Zhen, Huihuang Xu, Tingting Liu, Wang Jin, Yanjie Chai
Journal of System Simulation
Abstract: Constructing a human-computer interaction environment which can effectively enhance users’ experiences of serious game. By integrating the rehabilitation training process into an interactive game story, users can do their mental and body rehabilitation training in the community. The prototype of the game is realized by the game engine. Experimental results showed that using mouse to roam in the system is easier than other interaction method and the somatosensory interaction is convenient for exercising the limb. By designing emoji for virtual characters, it is easy for users to learn other people's emotions and the comfortable distances for others. The results …
Sliding Mode Auto Disturbance Rejection Control Of Pmsm Without Speed Sensor, Limin Hou, Yifu Ren, Hengfei Liu, Lin Dong
Sliding Mode Auto Disturbance Rejection Control Of Pmsm Without Speed Sensor, Limin Hou, Yifu Ren, Hengfei Liu, Lin Dong
Journal of System Simulation
Abstract: Aiming at the problem of parameter setting and response speed of the traditional ADRC method, a kind of novel sliding mode auto disturbance rejection speed controller is designed, and a sliding mode adaptive speed control system of PMSM without speed sensor is established. The nonlinear disturbance observer (NDOB) is used to replace the extended state observer (ESO) integrated disturbance estimation. The sliding mode control is introduced in the nonlinear state error feedback control; the sliding mode ADRC current controller and speed controller are designed; and the stability is proved by using Lyapunov theory. The rotor position and speed of …
A New Memristor Chaotic System And Its Application In Image Encryption, Shuanghui Qu, Zhihong Yang, Xuwei Rong, Shuhua Wu
A New Memristor Chaotic System And Its Application In Image Encryption, Shuanghui Qu, Zhihong Yang, Xuwei Rong, Shuhua Wu
Journal of System Simulation
Abstract: A new memristor chaotic system is designed by the method of bringing an ion migration memristor into the Chen system equation. The basic dynamic characteristics of the memristive system are investigated via bifurcation, Lyapunov exponent et al, which proves the validity of the new system. The new memristor system is applied in the image encryption to improve the security of the encryption key. A dual encryption algorithm is used, which makes every pixel value of plaintext influence all pixel values of ciphertext. Although there is no direct link between plaintext and ciphertext, the sensibility of ciphertext varying with …
From Digital Twin To Digital Engineering Modeling And Simulation Entering A New Era, Zhang Bing, Li Xin, Xinxin Wan
From Digital Twin To Digital Engineering Modeling And Simulation Entering A New Era, Zhang Bing, Li Xin, Xinxin Wan
Journal of System Simulation
Abstract: In the digital new era, all kinds of things and even the whole world can be digitized as a model. Simulation activities are conducted for various purposes, and the results can provide intelligent support for various decision-making. Digital twin is an important form of modeling and simulation application in the digital new era; it has been widely used in intelligent manufacturing, factories, buildings, smart cities and many other fields, showing a strong vitality; and its next step in the development direction is a comprehensive digital engineering. This paper reviews the history of the development of digital twin technology, analyzes …
Smart Design And Simulation Of Aerospace Control System Based On Digital Twin, Xiaoxiang Liu, Tang Liang, Haibo Zeng, Yubai Liu, Xinbang Zhang
Smart Design And Simulation Of Aerospace Control System Based On Digital Twin, Xiaoxiang Liu, Tang Liang, Haibo Zeng, Yubai Liu, Xinbang Zhang
Journal of System Simulation
Abstract: In accordance with the demand for intelligent development of spacecraft, and on the basis of the existing model-driven aerospace control design and simulation system, the new technological architectures using the digital twin and digital thread technique are carried out to achieve intelligent scheme design, simulation verification and in-orbit analysis. Employing the intelligent interconnection concept of cyber-physical systems, the space-ground integrated big data analysis and knowledge automation system are proposed. Based on this, the practical application scenarios are put forward through the full development flow and the entire life cycle. Not only it covers the smart application of information technology, …
Overview Of Digital Twins Application And Safe Development, Li Xin, Liu Xiu, Xinxin Wan
Overview Of Digital Twins Application And Safe Development, Li Xin, Liu Xiu, Xinxin Wan
Journal of System Simulation
Abstract: The Digital Twins simulate the whole process of the manufacture, and promote the development of smart manufacturing and other fields. In view of the rapid development and application of Digital Twins, the concept and history of Digital Twins are outlined, and its related technology system is given. The main application and development trend of Digital Twins in intelligent manufacturing as while as the main characters of Digital Twins in smart cities are combed. The cyber security problem of Digital Twins is discussed for intelligent manufacturing and smart cities. The scheme and suggestion are given for ensuring the cyber security …
Model And Simulation Of Taxi Market With E-Hailing Application, Tian Qiong, Jingtao Zhang
Model And Simulation Of Taxi Market With E-Hailing Application, Tian Qiong, Jingtao Zhang
Journal of System Simulation
Abstract: The emergence and popularity of e-hailing applications offer a new way for taxi drivers and passengers to communicate on line, which not only changes the behaviors of passengers and reduce the idle rate of taxi, but also brings the cost of information for taxis and passengers. Referring to the classic circular city model and combining with the characteristics of new way to take taxis and the cost of information, a model of taxi market with e-hailing application is formulated, which describes the behavior of passengers waiting for idle taxis and taxis cruising for un-served passengers. We provided an algorithm …
Spatiotemporal Characteristics Of Air Pollutants, Meteorology And Traffic During Heavy Haze Pollution In Beijing, Dongmei Hu, Jianping Wu, Kun Tian, Lüchao Liao, Yiman Du
Spatiotemporal Characteristics Of Air Pollutants, Meteorology And Traffic During Heavy Haze Pollution In Beijing, Dongmei Hu, Jianping Wu, Kun Tian, Lüchao Liao, Yiman Du
Journal of System Simulation
Abstract: We analyzed the spatiotemporal characteristics of air pollutants, meteorology, and average road speed during a heavy haze pollution period; and explored the combined impacts of temporary traffic restrictions and meteorological conditions on air quality. The results showed that five pollution stages were identified with remarkable variation patterns based on the evolution of PM2.5 concentration and weather conditions; and it also showed that the southern sites experienced heavier pollution than the northern sites. Stage P3 exhibited a combined effect of meteorology and traffic restrictions with delayed functions. A good AQI was more likely with higher temperature and lower humidity. …
Stereo Matching Based On Enhanced Message Passing For Investigation Of Traffic Accident Scenes, Jingzhou Huang, Houpan Zhou, Liliang Wang, Xiaofang Huang, Li Na
Stereo Matching Based On Enhanced Message Passing For Investigation Of Traffic Accident Scenes, Jingzhou Huang, Houpan Zhou, Liliang Wang, Xiaofang Huang, Li Na
Journal of System Simulation
Abstract: The investigation of traffic accident scenes requires restoring real scenes in a given time, and it can be implemented through binocular vision technique. For its core procedure—stereo matching, we studied the popular hierarchical belief propagation (HBP) algorithm and presented an improved approach which contained two modules: optimization in the native level and cost transmission between adjacent levels. The optimization ability is improved by enhancing the impact of message passing within and between levels for estimating disparities of unmatched points and correcting wrong disparities. Experiment results show that the optimization ability of the improved approach has been enhanced, and …
Visual Simulation Of Dynamic Burning Scene Of Single Plant, Weilong Ding, Linfeng Luo, Zheng Lei, Fuli Wu, Lifeng Xu
Visual Simulation Of Dynamic Burning Scene Of Single Plant, Weilong Ding, Linfeng Luo, Zheng Lei, Fuli Wu, Lifeng Xu
Journal of System Simulation
Abstract: At present, the research of the interactive process between plants and the flame mainly focuses on the visual simulation of forest fire scenario, but it is lack of the study on description of the interaction of individual plants and flame in detail. Aiming at this issue, this paper proposed a visual solution to model the process of a single plant burning. We established a plant model based on the branch node relationship and used particle system to model the flame. We set up a distance temperature field around a flame by using bounding sphere, and used a collision …
Simulation Analysis Of Self-Driving Travelling Routes, Sun Ling, Ya Dong, Liu Wei, Guanyun Yang
Simulation Analysis Of Self-Driving Travelling Routes, Sun Ling, Ya Dong, Liu Wei, Guanyun Yang
Journal of System Simulation
Abstract: China's tourism industry develops rapidly. By building self-driving traveling plan model and using traversal algorithm and stochastic optimization algorithm, the area optimal travel plans with Matlab simulation are obtained. If traveling time is too long in one area, the K-mean clustering algorithm can be used to divide it into two parts for simulation. A case study of 5A attractions in China is used for establishing a national self-driving traveling plan model. The concept of the Time Value is proposed. By comparing the travel modes of plane, train and car, the common model is established. The sensitivity analysis of Time …
System Analysis Method Based On Simulation Big Data, Guangya Si, Wang Fei, Liu Yang
System Analysis Method Based On Simulation Big Data, Guangya Si, Wang Fei, Liu Yang
Journal of System Simulation
Abstract: Wargaming and exploratory simulation with large-scale simulation systems produce massive simulation data. These data contain many complexity patterns of war, and are significant samples for studying the mechanism of war. Based on the definition of simulation big data, an analysis framework based on simulation big data is proposed, which is divided into three levels: simulation environment and data planning, big data acquisition and storage, and analysis and mining. The simulation data planning and analysis and mining are briefly introduced.
Robustness Analysis Of Interdependent Networks For Cascading Failure, Congdong Li, Wenbo Li, Cejun Cao, Wang Yu
Robustness Analysis Of Interdependent Networks For Cascading Failure, Congdong Li, Wenbo Li, Cejun Cao, Wang Yu
Journal of System Simulation
Abstract: For guiding interdependent system construction and improving its vulnerability, it is helpful to research on the robustness of interdependent networks. Based on the related works, the cascading failure model of interdependent networks coupled by nodes’ betweenness was built, which considered comprehensively the nodes’ overload, interdependent nodes’ failure, and links’ loss. The robustness of interdependent networks was studied from the perspective of different coupled intensities, coupled patterns, and different nodes’ failure. Simulation results manifest that the robustness of assortative link interdependent networks is the best, the robustness of disassortative link interdependent networks is the worst. The robustness of interdependent networks …
Multi-Projector Annular Display Based On Laser Marking Points, Shuiying Ge, Jitao Neng, Shibiao Xu, Xiaopeng Zhang
Multi-Projector Annular Display Based On Laser Marking Points, Shuiying Ge, Jitao Neng, Shibiao Xu, Xiaopeng Zhang
Journal of System Simulation
Abstract: This paper proposes a software method to construct a multi-projector display system. Based on the known geometric parameters of the projection curve surface such as radius, radian and the height of the circular-screen and the laser marking points, this method calculates the projection matrix of each projector to warp the image of each projector correctly. The Alpha blending and gamma rectification techniques are used to do the color blending. The experimental results show that the geometric warping and color blending effects of the seamless multi-projector display system are stable and effective.
Adaptive Backstepping Control Based Closed-Loop I/F Control Of Sensorless Permanent Magnet Synchronous Generator, Chang Da, Yu Yang, Zengqiang Mi, Xiaoming Zheng, Chenjun Sun
Adaptive Backstepping Control Based Closed-Loop I/F Control Of Sensorless Permanent Magnet Synchronous Generator, Chang Da, Yu Yang, Zengqiang Mi, Xiaoming Zheng, Chenjun Sun
Journal of System Simulation
Abstract: A novel strategy applied closed-loop adaptive back-stepping control to permanent magnet synchronous generator (PMSG) is proposed targeting the problem of the modification of torque for mechanical elastic energy storage (MEES) system utilizing PSMG as power source. This paper establishes the mathematical model of MEES system and PMSG, and presents the closed-loop adaptive backstepping control which makes the angle between the dq axis oriented by the current of stator and the dq axis oriented by the rotor a constant value via the speed and current closed-loop based on the analysis of open-loop I/f control. The closed-loop adaptive back-stepping control can …
Future Traffic Accident Risk Investigation Based On Human-Machine-Environment Factors, Yuan Quan, Gao Yan, Chenlu Qiu
Future Traffic Accident Risk Investigation Based On Human-Machine-Environment Factors, Yuan Quan, Gao Yan, Chenlu Qiu
Journal of System Simulation
Abstract: Based on the theory of human-machine-environment system engineering, this paper investigated the developing trends of autonomous vehicles and the types of traffic crashes in China, and integrated changing human-vehicle-road factors of traffic system to speculate the possible new types and scenarios of traffic crashes. The recent occurred crash cases involving autonomous vehicles were concerned and investigated. In future, some new affecting factors such as the mix traffic with various autonomous vehicles and piloted vehicles, the switching of driving behavior between human and machine, and the information security of intelligent traffic system, may cause traffic crashes. Among these, the human …
Potential Users Of Battery Electric Vehicle Based On Big Data Of Floating Vehicles, Kong Yuan, Yiman Du, Jianping Wu, Kezhen Hu
Potential Users Of Battery Electric Vehicle Based On Big Data Of Floating Vehicles, Kong Yuan, Yiman Du, Jianping Wu, Kezhen Hu
Journal of System Simulation
Abstract: Nowadays, the Chinese government is strongly pushing the adoption of new energy vehicles, so it is of great significance to find the most suitable users of EV (Electric Vehicle). This paper did a data mining work to find out target user group of EV based on two-month traveling data, driver information and vehicle attribute information of 12,000 floating vehicles in Beijing. The results show that residential area is more suitable to push the adoption of EV than other functional areas; adding charging piles in the destination area can turn the 9.2% of drivers who are not suitable for EV …
Research And Simulation Verification Of Integrated Access Technology For Electrical Equipment Based On Edge Computing, Zou Ping, Ruijie Shi, Xike Wu, Chuang Li, Yilin Zhang, Huang Jian, Li Lin
Research And Simulation Verification Of Integrated Access Technology For Electrical Equipment Based On Edge Computing, Zou Ping, Ruijie Shi, Xike Wu, Chuang Li, Yilin Zhang, Huang Jian, Li Lin
Journal of System Simulation
Abstract: In order to solve the problem of information islands existing in the production process of traditional electrical equipment, this paper proposes a technology for equipment integration into the industrial internet cloud platform. Based on the edge computing and WebService technologies, two models of device integration direct access and indirect access were established. The direct access model was verified by application simulation in a production workshop, which realized the high-speed and stable data transmission between the equipment and the industrial internet cloud platform. The results show that the technology is feasible and effective. The application of this device integration …
Simulation Analyses Of A Method For Extracting Dynamic Parameters From Forced Vibration Responses, Yumiao Wei, Zhili Zhang, Zhengjun Chang, Junyang Zhao, Xiangyang Li
Simulation Analyses Of A Method For Extracting Dynamic Parameters From Forced Vibration Responses, Yumiao Wei, Zhili Zhang, Zhengjun Chang, Junyang Zhao, Xiangyang Li
Journal of System Simulation
Abstract: To characterize the dynamic features of electromechanical system, a method is researched for dynamic parameters extraction from the forced vibration responses. The forced vibration response signals are processed by HVD method, and the free damped oscillation components are acquired. The SSA-FREEVIB analysis is conducted for the obtained components to measure the dynamic characteristics. The equalization procedures are implemented for the backbones and damping data, the resonance frequency and Q value are therefore accurately estimated. Simulation results show that the calculated resonance frequency and Q value coincide well with the theoretical values. A good anti-noise performance of the proposed …
Temporal Network And Its Application, Mingzhi Zhang, Luo Kai, Wu Xi, Qingjun Zhang
Temporal Network And Its Application, Mingzhi Zhang, Luo Kai, Wu Xi, Qingjun Zhang
Journal of System Simulation
Abstract: The traditional method which aggregates the information in a period of time to the static network cannot reflect effectively the dynamic features between the network nodes and their relations. The temporal network and its applications were studied. The temporal network was introduced and the differences between temporal network and static network were analyzed. The types and the two kinds of representation methods of temporal network were divided. The model of temporal network was constructed. Temporal path and temporal distance were discussed. Taking the vulnerability analysis of space information network for example, the results show the advantages of temporal network …
Effect Of Flow Field Environment On Microstructure Surface Preventing Microorganism Attachment, Chunxi Li, Quanxi Xue, Xiangshan Zhang, Xuemin Ye
Effect Of Flow Field Environment On Microstructure Surface Preventing Microorganism Attachment, Chunxi Li, Quanxi Xue, Xiangshan Zhang, Xuemin Ye
Journal of System Simulation
Abstract: The kinetic characteristics of microorganism model moving in different surfaces and flow field environments are simulated. The internal flow dynamics and the inherent mechanism of antifouling on microstructure surface are examined. The results indicate that for the static flow field, vortices are generated in the micro-pits as microorganism moves above microstructure surface. The velocity in the microstructure surface is greater than that in the smooth surface, and the strain rate and shear stress exerted on microorganism are relatively smaller resulting in the rapid passing the microstructure surface. For the dynamic flow field, the flow field presents regular fluctuations …
Dynamic Demand Forecast Of Emergency Materials For Flood Disasters Based On Improved Gm (1,1) Model, Zhongjun Hu, Yanqiu Liu, Li Jia
Dynamic Demand Forecast Of Emergency Materials For Flood Disasters Based On Improved Gm (1,1) Model, Zhongjun Hu, Yanqiu Liu, Li Jia
Journal of System Simulation
Abstract: The sudden and uncertainties of the flood disaster make it difficult to collect large sample data for forecasting the demand of emergency materials quickly and accurately. Based on this, this paper proposes an improved GM (1,1) dynamic forecasting model based on the gray system theory; constructs the dynamic demand model of emergency materials in combination with the inventory management method; and takes the real flood disaster in March 2016 as a case study. The validity of the model proposed in this paper is verified. The results show that the improved GM (1,1) model is feasible and practicable, and …
Recognition Method On Two-Phase Flow Regime Based On Cross Recursive Analysis, Yongbo He, Yushan Dong, Rongrong Xue
Recognition Method On Two-Phase Flow Regime Based On Cross Recursive Analysis, Yongbo He, Yushan Dong, Rongrong Xue
Journal of System Simulation
Abstract: Aiming at the problems that the two-phase flow regime recognition speed is slow and the recognition accuracy is low, a flow regime recognition method is proposed based on cross recursive analysis (CRA) without imaging. The false nearest neighbors are used to analyze flow regime capacitance values measured by capacitance sensor to obtain an optimal embedding dimension; and the embedding dimension of cross recursive plot is established for several typical flow patterns. The capacitance values of the simulation flow regimes and the reference flow regimes are analyzed using cross recursion to get a set of cross recursive plots. The similarity …
Error Control On Unequal Diameter Machining Of Arc Surface Cam, Hu Dongfang, Jianwei Guo
Error Control On Unequal Diameter Machining Of Arc Surface Cam, Hu Dongfang, Jianwei Guo
Journal of System Simulation
Abstract: The effective control for the machining error is an important means for obtaining high precision and high efficiency of the unequal diameter profile machining of the arc surface cam. According to the space meshing principle and the rotation transformation tensor method, the contact line between the tool and the cam is analyzed; the cutter position offset and direction in the machining process are calculated. The actual working profile of the unequal diameter machining cam equation is established. Calculation method of normal error of globoid cam profile is deduced by the principle of differential geometry. The comparison between the …
Two-Level Spare Parts Support Effectiveness Evaluation Model Under (S-K, S) Supply Strategy, Songshi Shao, Wei Yong
Two-Level Spare Parts Support Effectiveness Evaluation Model Under (S-K, S) Supply Strategy, Songshi Shao, Wei Yong
Journal of System Simulation
Abstract: Spares are one of the important factors of the operational readiness and the mission success. The (S-K, S) supply strategy is proposed based on the multi-level supply mode according to spares’ reliability and price. Simulation model is established to evaluate the support effectiveness of spare parts by the principle of discrete event simulation. The analytical evaluation model is also established by Gamma distribution characteristics. An approximate model is verified and compared in an example; the results show that the calculation results of the two models are consistent; and the results of approximate model are …
Cloud-End Cooperative Manufacturing And Simulation Application In Electrical Equipment Industry, Ruijie Shi, Zou Ping, Xike Wu, Liu Gang, Gao Chen, Junyuan Zhang, Li Lin, Guo Li
Cloud-End Cooperative Manufacturing And Simulation Application In Electrical Equipment Industry, Ruijie Shi, Zou Ping, Xike Wu, Liu Gang, Gao Chen, Junyuan Zhang, Li Lin, Guo Li
Journal of System Simulation
Abstract: Electrical equipment manufacturing industry hopes to achieve cloud-end cooperative manufacturing of the whole industry chain services by means of national network e-commerce cloud platform. On the basis of explaining the role of simulation in cloud-end cooperative manufacturing, this paper analyses the practical problems faced by enterprises in electrical equipment industry to realize cloud-end cooperative manufacturing, and presents effective solutions and overall solution; all kinds of the necessary application services are provided, which coincide with the actual requirement of electrical equipment manufacturing industry; and the research results of the key problems for realization about them are introduced. The overall industry …
Modeling And Simulation Of Missile Trajectory Based On Practical Sampling, Wu Shuai, Xiaohua Zhou, Lili Wang, Xingzhong Yao
Modeling And Simulation Of Missile Trajectory Based On Practical Sampling, Wu Shuai, Xiaohua Zhou, Lili Wang, Xingzhong Yao
Journal of System Simulation
Abstract: Aiming at the problem of lacking the proper simulation method for missile trajectory in combat simulation training, this paper analyzes the limitations of the 6D and 3D simulation models, proposes a method of trajectory simulation with missile kinematics model and history measured data, and taking an air-to-surface ballistic missile with midcourse-terminal guidance as an example, describes the model construction process in detail. Through the verification, validation and simulation experiments, it shows that this method can simulate various types of missile trajectory with high confidence on both sides of “red and blue”, which has an important reference meaning for missile …