Simulation And Exergy Analysis Of Aircraft Fuel System,
2020
School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;
Simulation And Exergy Analysis Of Aircraft Fuel System, Liu Shuang, Wanyan Xiaoru, Damin Zhuang
Journal of System Simulation
Abstract: Based on a certain type of aircraft fuel system design for the prototype, and characterized by the self supplied fuel network, the mathematical models of the main components were built. Using the modular structure method, the Simulink/Matlab was adopted for building the simulation modules of various components and forming the whole simulation system. According to the simulation calculation, the flow, pressure and temperature for each node of the fuel system were obtained, and the effects of several parameters of heat exchangers on its exergy losses were analyzed. The present study provides a new method and idea for the modeling …
Analysis The Nano Contact Force Of Single Crystal Copper In Contact And Separation Processes,
2020
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;
Analysis The Nano Contact Force Of Single Crystal Copper In Contact And Separation Processes, Jianmeng Huang, Jingjing Chen
Journal of System Simulation
Abstract: On the basis of considering the adhesive force and copper substrate elastic-plastic deformation, the contact and separation processes between diamond indenter and copper substrate are simulated based on EAM and Morse potentials and Verlet algorithm. The results show that, when diamond indenter approaches slowly to copper substrate during the contact process, some atoms at the top level of substrate happened “snap back” phenomenon significantly due to the gravity became the main interaction force. Furthermore, it can be seen that the contact force and the accumulation phenomenon of dislocation atoms increase gradually with the increment of diamond displacements. During in …
Research Progress On War Complex System Of Systems Modeling Based On Complex Network,
2020
The Department of Information Operation & Command Training, National Defense University, Beijing 100091, China;
Research Progress On War Complex System Of Systems Modeling Based On Complex Network, Ma Li, Mingzhi Zhang
Journal of System Simulation
Abstract: The crucial issue of war complex system of systems (SoS) modeling is to represent the complex coupling and interaction among components of SoS based on networks. The complex network provides new means of SoS modeling. The Characteristics of complex network suitable to SoS modeling were introduced, and two kinds of general method for SOS modeling based on complex network were summed up. The research progress on operational SoS modeling was elaborated from the four aspects of networked description of SoS, modeling algorithm of SoS network, evaluation for SoS based on complex network and the combination of complex network and …
Study On Personalized Data Driven Method Of Surface Of 3d Liver Models,
2020
Institute of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China;
Study On Personalized Data Driven Method Of Surface Of 3d Liver Models, Guodong Chen, Jiexiong Wang, Chen Yi
Journal of System Simulation
Abstract: The personalization of 3D liver models and the acquisition of liver models with high precision are two key technologies in virtual surgery systems. A personalized data-driven method aiming at the problems of time efficiency and precision of liver models was proposed. The liver model with high precision from previous research achievements and personal CT datasets were processed respectively, and then some feature points were marked on both the model and the CT datasets. The PCA algorithm was used to get the initial matching, the ICP algorithm was used to get the matching of the feature points, and then an …
From Sse To Opencl: Comparison Of Parallel Algorithms For Skeletal Animation On Multi-Core Cpus,
2020
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China;
From Sse To Opencl: Comparison Of Parallel Algorithms For Skeletal Animation On Multi-Core Cpus, Shousheng Liu, Chen Ge, Chunyong Ma, Han Yong
Journal of System Simulation
Abstract: While skeletal animations consist of high fidelity mesh and complex vertex binding, there is a huge performance bottleneck. Previous studies used GPUs to accelerate animation, but the general purpose computing performance of cheap GPUs was lower than high end CPUs. In order to explore the performance for multi-core CPUs to make up the shortfall of cheap GPUs for general purpose computing, the latest parallel scheme based on OpenCL which integrated the former two levels of parallelization was proposed, comparing to the traditional parallel scheme formed by SSE and OpenMP oriented to instruction parallelization and thread parallelization separately. The experimental …
Simulation On Superframe Transmission Mechanism In Wireless Sensor Networks,
2020
1. Software Engineering, Beijing University of Technology, Beijing 100124, China;;
Simulation On Superframe Transmission Mechanism In Wireless Sensor Networks, Hairong Yan, Yufei Wei, Zhang Yan, Xie Yue, He Kai
Journal of System Simulation
Abstract: At present, studies on real-time performance and reliability of WSN are mostly based on the performance analysis, protocol optimization or mathematical modeling with IEEE 802.15.4 standard MAC Protocol. However, there is no concern about the large impact on the network real-time and reliability caused by duration of the competitive access control phase (CAP) and non-competitive access control stage (CFP) in the IEEE 802.15.4 standard superframe structure. To solve these problems, a MAC layer superframe mechanism simulation algorithm was designed and implemented to simulate the IEEE802.15.4 standard MAC-layer superframe mechanism by establishing a state machine model. This design also built …
Research On Interoperability Between Tena And Certain Command & Control System,
2020
Department of Electric and Optics Engineering, Ordnance Engineering College, Shijiazhuang 050003, China;
Research On Interoperability Between Tena And Certain Command & Control System, Zhihua Dong, Yuanchang Zhu, Yanqiang Di, Xianguo Meng
Journal of System Simulation
Abstract: The heterogeneity prevents systems from the interoperability between C2 system and TENA for inter-connection in test community. Message Transfer Service contains End-to-End deployment mode and Cross-Network deployment mode, respectively there being two Inter-architecture with TENA system. Gateway can be designed to be single-threaded or multi-threaded. From the perspective of interoperability Gateway realizes the interoperability between communication protocols, object models and supporting services. Cooperation mechanism is designed to achieve the interoperability between the communication mechanism of pull mode in TENA and in C2P; meta-model of Message with OWL, and the object model interoperability is realized through model conversion; self-defined …
Research On Simulation Of Manufacturing Grid Resource Allocation Based On Scale Free Network,
2020
Nanjing University of Posts and Telecommunications, Nanjing 210048, China;
Research On Simulation Of Manufacturing Grid Resource Allocation Based On Scale Free Network, Xiangbin Zhang, Yanyan Li
Journal of System Simulation
Abstract: In order to study the variation of resource allocation efficiency in manufacturing grid, the manufacturing grid resource allocation network model was established based on scale free network theory taking the manufacturing resource characteristics such as distribution and diversity into account. By calculation of the statistical indicators of complex networks and attribute functions, the appropriate resource allocation scheme was selected to realize global optimal resources allocation. Using this model and evaluation index of resource allocation, the variation rule was figured out that explained how resource allocation efficiency varied with structural evolution of manufacturing grid through analyzing the data from simulation …
Modelingrandom Kelvin Cell Micro-Structure For Open-Cell Foam And Its Application On Compression Response Of Open-Cell Aluminum Foam,
2020
1. Department of Computer and Information Engineering, Huainan Normal University, Huainan 232001, China;;
Modelingrandom Kelvin Cell Micro-Structure For Open-Cell Foam And Its Application On Compression Response Of Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao
Journal of System Simulation
Abstract: It is very difficult to model an applicable microstructure for the open cell foams. Using the Python scripting language and the commercial code ABAQUS, the structures for regular Kelvin cell, regular Kelvin open cell foams and random Kelvin open cell foams were designed and modeled automatically. The methodology for modeling, the design and implement for the key algorithms in the process of modeling were presented. For the open cell Aluminum foam, the regular Kelvin cell open cell model and the random Kelvin cell open cell foams model were developed, respectively, and the mechanical responses of them under quasi-static …
Design Of Micro-Strip Antenna Based On Step-Like Electromagnetic Band-Gap Structure To Improve Bandwidth And Gain,
2020
Physics and Electron Communication Department of Leshan Normal University, Leshan 614004, China;
Design Of Micro-Strip Antenna Based On Step-Like Electromagnetic Band-Gap Structure To Improve Bandwidth And Gain, Zhigang Xiao, Jiang Yao, Shaoquan Yin
Journal of System Simulation
Abstract: Design of a micro-strip antenna based on electromagnetic band-gap structure can significantly improve the bandwidth and gain of the antenna. EBG structure is used to suppress the surface wave propagation and increase the radiation gain of the antenna. At the same time, the antenna substrate thickness increase is beneficial to expand the bandwidth of the antenna. According to the actual need, the EBG and the antenna can use diffident substrate. The method can replace the traditional choke ring antenna and significantly reduce the antenna size without sacrificing the performance of the antenna.
Man-Machine Coordinated Intelligent Flight Path Planning Algorithm,
2020
School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China;
Man-Machine Coordinated Intelligent Flight Path Planning Algorithm, Ren Peng, Xiaoguang Gao
Journal of System Simulation
Abstract: Man-machine coordinated flight path planning of UAV low-altitude penetration is a key technology achieving manned and unmanned aerial vehicles cooperative combat. The algorithm of man-machine coordinated intelligent flight path planning was proposed, combining artificial auxiliary decision with novel intelligence algorithm, a chromosome integer code with changeable length based on angle was used to represent flight path. Human’s wisdom and experience could make up for the lack of intelligence algorithm. In the most dangerous environment, it made the best possible use of the human brain to guide solution procedures of the flight path planning on pop-up threats. A …
Research On Model And Simulation Of Bullwhip Effect In Supply Chain Based On Pid,
2020
Harbin University of Commerce, Harbin 150028, China;
Research On Model And Simulation Of Bullwhip Effect In Supply Chain Based On Pid, Hebing Zhang
Journal of System Simulation
Abstract: Under the uncertainty of market demand, the method exponential smoothing was utilized to forecast the real demand, coupled with information sharing and PID control theory. Four kinds of ordering models were established under different backgrounds, including the ones with or without information sharing, further on, based on the PID control respectively. A comparing of values was obtained by the simulation examples of corresponding bullwhip effect. Through the research, it is found the impact of PID control is better than that of information sharing on weakening the bullwhip effect, which is fit for the condition without information sharing. PID …
Controller Design For Hypersonic Vehicle Based On Kalman Filter,
2020
Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China;
Controller Design For Hypersonic Vehicle Based On Kalman Filter, Tao Chao, Jianliang Ai
Journal of System Simulation
Abstract: For a generic hypersonic vehicle with unstable longitudinal and lateral-directional mode, considering the three dimensional turbulence and their gradient, all states linear dynamic equations were established. All states H∞ feedback control was proposed based on the discrete Kalman filter when three dimensional turbulence and system measurement noise were taken into consideration. In this way, state estimation created by the Kalman filter to the H∞ controller was delivered. This method could guarantee the robustness when external atmospheric turbulence and itself parameter matrices perturbation caused by the flight condition variation existed. The results show that for both the nominal …
Non-Uniform Axial Force Precise Modeling And Simulation Of Recycled Aggregate Concrete Confined By Steel Tube Column,
2020
1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;;
Non-Uniform Axial Force Precise Modeling And Simulation Of Recycled Aggregate Concrete Confined By Steel Tube Column, Wenxian Feng, Yunchao Tang, Zhang Ye, Cai Yang, Dingjing Bao, Jinmu Hu
Journal of System Simulation
Abstract: According to the complexity of non-uniform axial force on recycled aggregate concrete confined by steel tube column, precise modeling and simulation on non-uniform axial force were put forward, mechanic properties of axial force under uniform and non-uniform conditions were analyzed, and its three-dimensional model and force model were established. Then impact of load capacity was analyzed, such as geometric diameter, loading condition, and deformation during production. Force simulation and experimental results fit relatively well. It turned out that uniform axial load capacity was greater than concentrated eccentric axial load capacity. Besides, eccentric axial load capacity was related to eccentricity. …
Simulation Of Grid-Connected Solar Micro-Inverter Based On Fuzzy Pi Controller And Feed-Forward Compensation,
2020
State key laboratory of Alternate Electrical Power System with Renewable Energy Sources, Baoding 071003, China;
Simulation Of Grid-Connected Solar Micro-Inverter Based On Fuzzy Pi Controller And Feed-Forward Compensation, Weiliang Liu, Changliang Liu, Huichao Zhang, Yongjun Lin, Liangyu Ma
Journal of System Simulation
Abstract: Grid-connected solar micro-inverter is a highly nonlinear and time-varying system, so it is difficult to achieve good control effect using traditional PI controller. Small signal analysis model of micro-inverter was established, grid-connected current control strategy composed of fuzzy PI controller and grid voltage feed-forward was put forward, and the initial parameters of PI controller was optimized using the genetic algorithm. Simulation results show that the control strategy has the virtues of good robustness, small dynamic deviation, and could reduce the harmonic content of grid-connected current.
Research On Component-Based Modeling Of Combat Simulation Entity,
2020
Operation Research Center, Nanjing Army Command College, Nanjing 210045, China;
Research On Component-Based Modeling Of Combat Simulation Entity, Guohong Du, Wei Wei, Luyao Li
Journal of System Simulation
Abstract: According to the fact that combat simulation entity models built by traditional modeling method lack of standardization and reusability, based on analysis and induction of combat simulation entity factors, component-based modeling method of combat simulation entity was brought forward. Meanwhile, entity management mechanism of using “scheme-unit-entity-component” and model interaction mechanism of message-derived, event-subscribed and event-dispatched were discussed. The component-based modeling method will provide technique support to build excellent combat simulation entity model and standardizing the development of combat simulation entity model to avoid low-level duplication.
Error Correction Methods In Numerical Simulation For Unilateral Constraint Dynamics,
2020
College of Mechanical Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
Error Correction Methods In Numerical Simulation For Unilateral Constraint Dynamics, Haitao Gao, Yali Han, Youxiong Xu, Songqing Zhu, Zailuo Wu
Journal of System Simulation
Abstract: Aiming at problem of calculation errors and constraint violation in numerical simulation for dynamics of unilateral constraint such as contact and collision, the error projection correction methods were put forward. On the basis of dynamical behavior of unilateral constraint described by linear programming model, mixed linear complementarity dynamics was built. Numerical simulation methods for the mixed linear complementarity dynamics were derived. In order to reduce calculation error and constraint violation caused by this error in the numerical simulation, an error correction method was built for correcting position and velocity error of numerical solution on the base of bilateral …
Improved Strategy To Reduce Common-Mode Voltage For Matrix Converter,
2020
1. Xi'an University of Technology, Xi'an 710048, China;;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China;
Improved Strategy To Reduce Common-Mode Voltage For Matrix Converter, Weizhang Song, Li Xi, Minyuan Li, Yanru Zhong
Journal of System Simulation
Abstract: Aiming at the large instantaneous common-mode voltage in traditional space vector modulation strategy for two-stage matrix converter (TSMC), on the basis of analyzing the laws of common-mode voltage, an improved modulation strategy to reduce common-mode voltage was proposed. To suppress common-mode voltage effectively, in this strategy, the rectification stage sector was subdivided into twelve sectors from six sectors, according to the sector of the reference current vector and dc-side voltage, the switching points of inverter stage were redefined and reallocated, and zero vector of inverter was selected and distributed reasonably, instantaneous maximum value of common-mode voltage was reduced to …
Control Law Research And Design Of Large Commercial Civil Aircraft For Oscillatory Failure,
2020
Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China;
Control Law Research And Design Of Large Commercial Civil Aircraft For Oscillatory Failure, Ziyu Yao, Jianliang Ai
Journal of System Simulation
Abstract: The oscillatory failure often occurs because of the electronic equipment failure or the structure vibration in the modern commercial civil aircraft. The solution to the problem needs lots of sensors and control controllers and it make the control structure complex and leads to further fault. The mathematical model including the servo loop was built and the analytical redundancy was used for the fault detection. A combined control law was designed based on the detection result that was the residual of the servo signal and the state quantities. The design improves the control structure of the EFCS feedforward channel …
Research On Motion Control Technology Of Virtual Human’S Lower Limb Based On Optical Motion Capture Data,
2020
1. State Key Discipline Laboratory of Armament Launch Theory and Technology, The Second Artillery Engineering University, Xi'an 710025, China;;
Research On Motion Control Technology Of Virtual Human’S Lower Limb Based On Optical Motion Capture Data, Liang Feng, Zhili Zhang, Xiangyang Li, Zhibo Tang, Ma Chao
Journal of System Simulation
Abstract: As passive-optical motion capture equipment could only capture the motion information of human’s key joints, a simplified skeleton structure model of virtual human was introduced; and then the error sources of motion data of virtual human were analyzed according to the acquisition process of optical motion capture data based on the skeleton structure model. Focusing on the problem of poor continuity of motion process of virtual human’s lower limb caused by continuity deficiency of motion capture data, a motion control method was proposed to strengthen the control of motion process of virtual human, which included data smoothing of motion …
