Modeling And Simulation For Automobile Connecting Rod Production Line Based On System Dynamics,
2019
1. Department of Automation, Tsinghua University, Beijing 100084, China;;
Modeling And Simulation For Automobile Connecting Rod Production Line Based On System Dynamics, Li Han, Wenhui Fan, Feng Yuan, Mengni Zhu, Shengxiao Zhang
Journal of System Simulation
Abstract: In the production line system, it is of much significance to assign operation to workstations in order to balance the manufacturing workload and increase productivity under the given constraint conditions. Based on System Dynamics theory, this paper builds a simulation model of a connecting rod production line in an automobile component company. With this model, the paper analyses the balancing rate and influential factors. Then some preliminary optimization is made to improve the production line performance.
Modeling And Simulation Of Connecting Rod Production Line,
2019
Department of automation, Tsinghua University, Beijing 100084, China;
Modeling And Simulation Of Connecting Rod Production Line, Yuanyuan Yan, Wenhui Fan, Feng Yuan
Journal of System Simulation
Abstract: Discrete event system simulation method is widely applied to solve various problems, and line balancing problem is also one of them. In this paper, we use discrete event system simulation method to solve line balancing problem. Connecting rod production line is modeled by using DES. A production line model is built and simulated in AnyLogic, the bottleneck process and the problems to be optimized are analyzed. A small program in MATLAB is used to optimize the production line, and find the optimal solution. Simulate again.
Design Of Simulation Platform For Space Operation Mission,
2019
1. National Key Laboratory of Aerospace Flight Dynamic, College of Astronautics, Northweatern Polytechnical Univesity, Xi'an 710072, China;;
Design Of Simulation Platform For Space Operation Mission, Yuan Jing, Jianpin Yuan, Mingming Wang, Wang Fei, Zhang Chi
Journal of System Simulation
Abstract: The design of simulation platform for space mission operations is investigated. The platform has the advantages of high generality and extensibility, being easy to build up new task. FMI (Functional Mockup Interface) standard is adopted to achieve integration of multisource models, and Python scripts are used to realize the task schedule. Unity3D is adopted to implement the visual display system which could display space manipulation process with high fidelity 3D virtual scenes. Configuration tool is developed to map the 3D objects in visual scene with simulation physical variables for complex space control mechanism, which greatly improves the …
Restrain Boundary Effect Of Emd Based On Least Square Fitting,
2019
1. Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, civil aviation university of China, Tianjin 300300, China;;2.Aeronautical Engineering Institute, Civil Aviation University of China, Tianjin 300300, China;
Restrain Boundary Effect Of Emd Based On Least Square Fitting, Zhenpeng He, Zhiqi Zhu, Haichao Xie, Yawen Wang, Zongqiang Li, He Rui, Chaoping Du, Jinlan Li
Journal of System Simulation
Abstract: To improve the accuracy of mechanical fault diagnosis, it’s meaningful to do research on the boundary effect of EMD. In this article, least squares linear method is applied to extend local extremum points at the end of a data series, which judges that whether the maximum value is within the wave fluctuation range of the original signal maximum points, whether the minimum value is within the wave fluctuation range of the original signal minimum points. It compares the extended extreme points and endpoint values, so the best signal endpoint is obtained. By calculating the value of similarity coefficient and …
Simulation Research On Post-Earthquake Road Network Repair Schedule Under Dynamic Traffic Flows,
2019
1.Business School of Hunan Normal University, Changsha 410081, China;;
Simulation Research On Post-Earthquake Road Network Repair Schedule Under Dynamic Traffic Flows, Shuanglin Li, Bin Zheng
Journal of System Simulation
Abstract: It is critical to repair the road network immediately to improve the emergency efficiency after earthquake. A mathematics model for post-earthquake road network repair scheduling under dynamic traffic flows (PRNRSDTF) is created and a hybrid genetic algorithm is provided to maximum the cumulative utilities. Finally, in the context of Wenchuan earthquake, a numerical example is abstract from Jingyang district of Deyang City to verify the reliability and validity of the proposed model and algorithm. The normal road network repair scheduling model without considering dynamical traffic flows is taken as a comparison. The results show that the PRNRSDTF model …
Simulated Analysis Of Temporal Robustness For Composite Service,
2019
1.College of Electrical Engineering, Guangxi University, Nanning 530004, China;;2.College Of Information Science and Engineering, Guilin University Of Technology, Guilin 541000, China;;
Simulated Analysis Of Temporal Robustness For Composite Service, Hengzhou Ye, Taoshen Li, Yunhui Guan
Journal of System Simulation
Abstract: The execution time of a service may fluctuate due to the variety of network, CPU, disk I/O and workloads, which will affect the makespan of the composite service. It is crucial to study the probability distribution and influencing factors of the real makespan to guarantee the performance of the composite service. This paper adopts directed acyclic graph (DAG) to describe the composite service. Also, with the goal of evaluating the variety degree of the makespan, we propose a temporal robustness metric for composition services. Through the rigorous analysis, we can find the boundary of this metric. By the analysis …
Permanent Magnet Synchronous Motor Fuzzy Forgetting Factor Recursive Least Squares Parameter Identification,
2019
Jiangnan University Internet of Things Engineering College Institute of Electrical Automation, Wuxi 214122, China;
Permanent Magnet Synchronous Motor Fuzzy Forgetting Factor Recursive Least Squares Parameter Identification, Yanxia Shen, Baolong Jin
Journal of System Simulation
Abstract: In order to improve the stability and convergence rate of permanent magnet synchronous motor (PMSM) on-line identification, this paper proposes a fuzzy forgetting factor least squares algorithm based on the least squares algorithm with forgetting factor. The linear regression model of permanent magnet synchronous motor is established by using the linearization technique of Pade approximation method. A fuzzy controller is designed by using the current error and the forgetting factor can be adjusted adaptively. The proposed method is applied to the field of on-line identification of permanent magnet synchronous motor stator resistance, which solves the contradiction between the result …
Simulation Study On Vibration Absorption Efficiency Of Parallel Nonlinear Energy Sinks,
2019
Tianjin University of Technology, Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System, Tianjin 300384, China;
Simulation Study On Vibration Absorption Efficiency Of Parallel Nonlinear Energy Sinks, Jian’En Chen, He Wei, Weimin Ge, Liu Jun, Zhong Rui
Journal of System Simulation
Abstract: Parallel nonlinear energy sinks are used to suppress the vibration of the primary structure. The vibration absorption efficiencies of the single and parallel NESs are comparatively investigated. The dynamic equation under harmonic excitation is derived and the dynamic responses are analyzed by using numerical method. Through studying the influences of the installation locations and parameters of the single and parallel NESs respectively, it is found that, under normal temperature, the vibration absorption efficiency of the parallel NESs is better than that of the single NES which having the equal mass with the former absorber. Considering that the resonance frequency …
Detection Method Of Weak Signal With Multi-Stable Stochastic Resonance Under Color Noise,
2019
1.Chongqing Key Laboratory of Signal and Information Processing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;;
Detection Method Of Weak Signal With Multi-Stable Stochastic Resonance Under Color Noise, Zhang Gang, Yi Tian, Li’Na He
Journal of System Simulation
Abstract: The color noise is combined with a multi-stable stochastic resonance system. The characteristics of stochastic resonance in multi-stable system are analyzed deeply under color noise which is more close to reality, and the signal-to-noise ratio gain is regarded as the measurement index. The self-adaptive method is used to study multi-stable stochastic resonance system parameters a, b, c and intensity amplification facto D on the resonant output. Based on the above analysis, different signals are detected. Multi-stable system is applied in rolling bearing fault diagnosis. Experimental results demonstrate that the parameters induced multi-stable system has significant detection effect on weak …
Auxiliary Docking Maneuver Control Simulation Of Dual-Arm Space Manipulator After Capturing Operation,
2019
School of Mechanical Engineering and Automation, Fuzhou University, Fujian Provincial Collaborative Innovation Center of High-End Equipment Manufacturing, Fuzhou 350116, China;
Auxiliary Docking Maneuver Control Simulation Of Dual-Arm Space Manipulator After Capturing Operation, Cheng Jing, Chen Li
Journal of System Simulation
Abstract: The auxiliary docking maneuver coordination control problems for dual-arm space robot capturing a target are discussed. The dynamic model of closed chain composite system is established based on theorem of impulse and closed-loop constraints, the impact effect of composite system after capturing operation is analyzed at the same time. The robust coordinated control method based on extended state observer (ESO) is designed for the composite system with uncertain parameters. The extended state observer is used to estimate and compensate the unknown dynamics; the precision of docking maneuver is guaranteed by composition and state feedback control. The stability of system …
A Composite Islanding Detection Method Based On Ndz Pre-Estimation Mechanism,
2019
School of Information Engineering, Nanchang University, Nanchang 330031, China;
A Composite Islanding Detection Method Based On Ndz Pre-Estimation Mechanism, Long Xin, Ziwei Zhu, Xu Min
Journal of System Simulation
Abstract: Islanding detection methods are divided into passive and active types. The former has a large detection blind area and low success rate. The latter has high accuracy and reliability, but it reduces the power quality of the grid by continuously adding disturbances. Thus, this paper proposes a compound islanding detection method based on NDZ pre-estimation. Several electrical parameters of the load flow on the grid side and the flow load on the inverter side are separately calculated and pre-evaluated, and Sandia frequency offset method is selectively introduced according to the evaluation result to complete the islanding detection. The …
A Novel Dual Random Pwm Scheme And Its Simulation Analysis,
2019
The Internet of Things Technology Application Engineering Research Center of the Ministry of Education, Jiangnan University, Wuxi 214122, China;
A Novel Dual Random Pwm Scheme And Its Simulation Analysis, Haopeng Wu, Tinglong Pan, Dinghui Wu, Zhicheng Ji
Journal of System Simulation
Abstract: In the consideration that random pulse position pulse width modulation (PWM) still contains discrete spectral components, a novel strategy of dual randomized modulation is presented. The proposed method is based on dual zero vector random pulse position PWM, in which zero vector is selected as V(1 1 1) when M≥0.7 and as V(0 0 0) when M<0.7, and the random variation of the pulse position and the switch frequencyis realized by increasing the switch frequency randomization. To insure better random variation degree of dual random PWM,WELL algorithm is introduced to generate random number. Simulation results show that the proposed scheme can …0.7,>
Dropouts Processing In Ads-B Real-Time Monitoring Based On Hybrid Filtering,
2019
Tianjin Key Lab for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;
Dropouts Processing In Ads-B Real-Time Monitoring Based On Hybrid Filtering, Xiaoyun Shen, Jinxing Shen, Siyuan Zhang, Weidong Jiao
Journal of System Simulation
Abstract: Due to the bad real-time performance of variable dimension Kalman filter in dealing with the leakage of ADS-B real-time monitoring, a position/speed hybrid filter method is proposed. The variable dimension Kalman filter is improved based on the characteristic that the position message and the velocity message of ADS-B message are sent at different time. Two measurement equations for position and speed are designed, and different measurement equation is selected according to message category. The speed/position and navigation accuracy category in message is utilized to estimate the position/speed of present moment, so as to effectively solve the problem of data …
Optimal Closed-Loop Guidance For Cruise Missiles Based On Pseudospectral Method,
2019
1.College of Aerospace Science and Engineering, National University of Defence Technology, Changsha 410073, China;;
Optimal Closed-Loop Guidance For Cruise Missiles Based On Pseudospectral Method, Liao Ying, Haiyu Ji, Gaoxiong Xue
Journal of System Simulation
Abstract: Cruise missiles facing complex constraints are prone to deviation from the intended trajectory due to disturbances and unexpected situations in flight. Based on solving the optimal control problem of trajectory optimization with pseudospectral method, the optimal closed-loop guidance is realized by continuous on-line trajectory reconstruction using the rolling time-domain strategy. The simulation experiments are also undertaken for the unexpected events and disturbances that may be encountered during flight to verify the capability and feasibility. Simulation results show that this method can meet the requirements of real-time and accuracy, and has good adaptability to different interference errors and task …
Study On Control Method Of Plane Steering Electro-Hydraulic Load Simulator,
2019
1. Civil Aviation University of China, Tianjin 300300, China;;
Study On Control Method Of Plane Steering Electro-Hydraulic Load Simulator, Xiaolin Liu, Jianmin Yin, Kun Yuan
Journal of System Simulation
Abstract: Aiming at the problems of low stability, low loading precision and slow response of the servo hydraulic load simulator, a control method based on the combination of the optimal quadratic theory and the improved feedforward compensation is proposed. This method is based on the optimal quadratic theory to design the optimal control algorithm to optimize the structural characteristics. The hydraulic cylinder piston displacement signals are used as the input of feedforward compensation control to design improved feedforward compensation controller. The simulation results show that this control method can not only improve the dynamic performance of the aircraft rudder electro-hydraulic …
Analysis Of Reconnaissance System Modeling And Simulation In Combat Simulation,
2019
Army Academy of Armored Force, Military Exercise and Training Center, Beijing 100072, China;
Analysis Of Reconnaissance System Modeling And Simulation In Combat Simulation, Fan Rui, Yaxin Tan, Junqing Huang
Journal of System Simulation
Abstract: Reconnaissance system is a complex system that integrates various types of reconnaissance equipment and is an important component of the combat capabilities of the current system. Therefore, the reconnaissance system is modeled and simulated in the army combat simulation. It is a key research to discuss its operational effectiveness in a certain combat background. This paper starts from the basic concept of reconnaissance, abstracts the basic flow of reconnaissance activities, analyzes the composition of the equipment in the reconnaissance system, summarizes the simulation flow of the reconnaissance system in combat simulation, and gives the modeling analysis of the reconnaissance …
A Simulation Study Of Power Battery Grouping Equalization System,
2019
Hunan University, School of Mechanical and Transportation Engineering, Changsha 410000, China;
A Simulation Study Of Power Battery Grouping Equalization System, Zhu Hao, Daxing Xia
Journal of System Simulation
Abstract: A grouping equalizer scheme of lithium-ion battery pack is proposed based on cuk chopper circuit and flyback transformer balanced circuits. The grouping equalizer process could be divided into two stages: balance of cell sub-group and balance between cell sub-group. Cuk chopper circuit is used in the balance of cell sub-group for transferring the energy between adjacent cells. Bidirectional flyback transformer is employed in the balance between cell sub-group. Any optional sub-group can be balanced and the balanced energy can be transferred bidirectionally. Finally, a balanced circuit model is created in Matlab/Simulink for simulation. Simulation results show that the grouping …
Oth Target Tracking Based On Transverse Earth Coordinate System In Arctic Region,
2019
1.Dalian Naval Academy, Dalian 116018, China;;
Oth Target Tracking Based On Transverse Earth Coordinate System In Arctic Region, Yongkan Sun, Pingping Zhang
Journal of System Simulation
Abstract: Aiming at the problem of the deviation of the target information when taking the geographic north as the azimuth datum in the horizon target tracking in Arctic region (especially in the polar regions), a virtual method to re-partition the surface of the earth is proposed which can transform the geographic pole region into a virtual equatorial region. On the basis of the above, the transverse latitude and longitude grid, the transverse earth coordinate system and the transverse geographic coordinate system are constructed, The transverse geographic north is proposed as the azimuth datum, the target range is represented with the …
Air Defense Fire Distribution Based On Cloud-Genetic Algorithm,
2019
1.The 28th Research Institute of China Electronic Group Corporation, Nanjing 210007, China;;2. Science and Technology on Information Systems Engineering Laboratory, Nanjing 210007, China;
Air Defense Fire Distribution Based On Cloud-Genetic Algorithm, Lei Ming, Bin Xie
Journal of System Simulation
Abstract: Air defense fire distribution is a critical problem in the researches on air defense operation. This paper builds a fire distribution model with the maximization of strike as its optimization objective, and proposes a cloud model-based modified genetic algorithm based on the advantageous characteristics of cloud model in combination of genetic algorithm, which not only accelerates the rate of convergence and increases search efficiency of the original algorithm, but also preferably avoids the problems of local optimum and premature convergence. Simulation experiments have verified the feasibility of the modified algorithm.
Hydrodynamic Characteristics Study Of Expendable Probe At Multi Cross Flow And Multi Attack Angle,
2019
College of Meteorology and Oceanography, National University of Defense Technology., Nanjing 211101, China;
Hydrodynamic Characteristics Study Of Expendable Probe At Multi Cross Flow And Multi Attack Angle, Zhentao Chen, Liu Feng, Xiaolei Wang, Ye Song
Journal of System Simulation
Abstract: The cross flow and attack angle are the two main influencing factors in the process of expendable probe releasing and sinking. The numerical simulation model is developed based on the hybrid grid and $k-\varepsilon$ turbulent model, and the hydrodynamic characteristics of five cross flows and five attack angles are analyzed. The results show that the drag coefficient of the probe in the horizontal direction increases gradually, while the drag coefficient of the probe in the vertical direction increases slowly with the increase of the cross flow. The drag coefficient in the horizontal direction increases gradually with the increase of …
