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Articles 3721 - 3750 of 3946

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Cfd Based Analysis And Improvement Of The Flow Field Of Stirred Tank Reactor For Crystallization, Zewen Ma, Liu Tao, Xudong Sun Jan 2019

Cfd Based Analysis And Improvement Of The Flow Field Of Stirred Tank Reactor For Crystallization, Zewen Ma, Liu Tao, Xudong Sun

Journal of System Simulation

Abstract: The computational fluid dynamics (CFD) method is adopted to analyze the flow field of 1L stirred tank reactor for crystallization. A popular CFD software named FLUENT is used to analyze the influence of a single layer turbine agitator on the flow field in a stirred tank reactor. The standard turbulence model of k-ε is employed to simulate a three-dimensional single-phase flow field of water solution. Simulation studies indicate that the simulated flow field is consistent with real distribution of the flow field, while it is seen that uniform blending can be achieved in the lower and middle parts of …

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Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu Jan 2019

Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu

Journal of System Simulation

Abstract: Aiming at the uncertainty of the dynamics system of reconfigurable manipulator, a control law based on the fuzzy adaptive algorithm is proposed to adaptively approach the friction and external disturbance in the system, achieving the compensation control of the reconfigurable robot arm. At the same time, the robust items are added in the control law in order to improve the compensation precision and anti-interference performance of the control law, and reduce the approximation error of the algorithm. By Lyapunov stability theory, it is proved that the proposed fuzzy adaptive control law and the robust fuzzy adaptive control law can …

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Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li Jan 2019

Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li

Journal of System Simulation

Abstract: As only small proportion of labeled data can be obtained from chemical processes, an online soft sensing modeling method based on semi-supervised locally weighted partial least squares is proposed . The labeled and unlabeled historical data are accumulated to construct training database. The similarity between the newly measured data and the sample points in the database are calculated and used as the weight of each data point. The semi-supervised locally weighted partial least squares model is constructed, and the Expectation Maximization (EM) algorithm is employed to estimate the parameters of the model. Online prediction achieves simulation results of debutanizer …

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Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin Jan 2019

Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin

Journal of System Simulation

Abstract: Aiming at the problem that the conventional historical data modeling method can not overcome the influence of disturbance on modeling accuracy, a historical data modeling method based on state observation is proposed. In this method, the data with the characteristic from dynamic to steady state are selected from the historical data as the modeling data, which is subjected to zero initialization processing based on the final steady state value. The processed data is then divided into two segments. The first segment is used to track the state of the prediction model, and the final observed state is used as …

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Facial Expression Recognition Based On Improved Dictionary Learning And Sparse Representation, Li Ming, Xiujiao Peng, Wang Yan Jan 2019

Facial Expression Recognition Based On Improved Dictionary Learning And Sparse Representation, Li Ming, Xiujiao Peng, Wang Yan

Journal of System Simulation

Abstract: In order to overcome the problems induced by illumination andocclude in facial expression recognition and reduce the time required by sparse representation classification, the facial expression recognition algorithm withfusion of HOG feature and improved KC-FDDL dictionary learning sparserepresentation is put forward. Improved K-means cluster and Fisher discriminationdictionary learningis implemented on thetraining setgenerated by extracting HOG features of normalized expression image.Facial expression classification is conducted by thesparse representation with weighted residuals. Experimental results on the Cohn-Kanade databaseshow that this method is lower time-consumingand more accurate for similar facial expression classification than other facial expression classification methods.

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Modeling And Simulation Of Difg Unit With Stator Inter-Turn Fault, Boqiang Xu, Liling Sun, Wenjuan Du Jan 2019

Modeling And Simulation Of Difg Unit With Stator Inter-Turn Fault, Boqiang Xu, Liling Sun, Wenjuan Du

Journal of System Simulation

Abstract: The mathematical model of doubly fed induction generator (DFIG) with stator inter-turn fault, which presents itself as standard form state space equation, is deduced and established, for the first time. The corresponding simulation model, i.e. Matlab S-function block is developed and embedded in a Matlab built-in routine simulating DFIG unit comprising wind turbine, converter, related mechanical/electrical control and DFIG. The simulation model of DFIG unit with stator inter-turn fault is established, which is a beneficial extension of Matlab simulation. The stability of DFIG unit under the healthy and faulty conditions is analyzed by using simulation. The results show …

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Research And Application Of Damage Development Of Rock Mass With Complex Structure Under Horizontal Offset, Tiejun Cui, Shasha Li, Yundong Ma, Laigui Wang Jan 2019

Research And Application Of Damage Development Of Rock Mass With Complex Structure Under Horizontal Offset, Tiejun Cui, Shasha Li, Yundong Ma, Laigui Wang

Journal of System Simulation

Abstract: In order to understand the stress and strain of the complex overlying strata with horizontal offset in service time of mining, the model of the overburden mining regions is created by PFM with the simulation platform of PFC3D. The overlying strata contains five layers including intrusive igneous rock, of which the bottom rock has anticline and syncline structure due to tectonic stress. The stress and strain characteristics of the five layers of rock mass are analyzed. Studies show that it takes the compressive stress 379 years to penetrate the overlying strata. The strongest penetrate path of the compressive stress …

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Method Of Power System Energy Storage Configuration Based On Flexibility Promotion, Weiqing Sun, Li Zhen, Yiming Tan, Fenglei Lü, Wenping Qiu, Hongzhong Li Jan 2019

Method Of Power System Energy Storage Configuration Based On Flexibility Promotion, Weiqing Sun, Li Zhen, Yiming Tan, Fenglei Lü, Wenping Qiu, Hongzhong Li

Journal of System Simulation

Abstract: To solve the problem of renewable energy access and aiming at system’s response capability to short-term uncertainty, power system flexibility and its evaluation index are defined. A method of energy storage configuration based on flexibility evaluation is proposed. The uncertainty from power supply is analyzed. Aiming at the uncertainty of renewable energy, a source flexibility evaluation index is defined. The principle and method of energy storage configuration are presented from the aspect of siting and sizing. The energy storage configuration model is created and solved considering both the system flexibility requirements and energy storage costs based on the …

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Optimization Design Of Fuzzy Energy Management For Plug-In Hybrid Electric Vehicles, Xiaolan Wu, Zhifeng Bai, Xiaohui Shi, Binggang Cao Jan 2019

Optimization Design Of Fuzzy Energy Management For Plug-In Hybrid Electric Vehicles, Xiaolan Wu, Zhifeng Bai, Xiaohui Shi, Binggang Cao

Journal of System Simulation

Abstract: Because of complex system configuration, it is difficult to find precise mathematics model of PHEV drivetrain. The fuzzy controller design depends mainly on expert’s experience and has much subjectivity. A fuzzy energy management strategy (EMS) based on particle swarm optimization (PSO) is presented. In this EMS, the fuzzy rules obtained from expert knowledge are unaltered and the PSO is used to optimize the parameters of membership functions of the fuzzy controller. The provided EMS model is built by Matlab/simulink and embedded in the Advisor software for simulation and comparative analysis. The result shows that, compared with the conventional …

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Apriori-Based Association Rule Algorithm And Its Application In Power Plant, Wencheng Huang, Jia Li, Daogang Peng, Li Wang Jan 2019

Apriori-Based Association Rule Algorithm And Its Application In Power Plant, Wencheng Huang, Jia Li, Daogang Peng, Li Wang

Journal of System Simulation

Abstract: The data mining technology for historical data of power plant has the problem of low efficiency as the data dimension is high and data size is large. Some parameters are set without theoretical guidance and the objective parameter value is not reasonably determined in the corresponding algorithm of data mining. A mining algorithm with improved quantitative association rule based on Apriori is proposed. Aiming at the economical operation of power plant, target guidance is used to constrain the dimension and compress the quantity in sample space, which improves the mining efficiency and determines the parameter’s target value reasonably. …

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Application Of Pwa-Based Safety Diagnosis Method In Cstr System, Yuhong Wang, Yang Pu Jan 2019

Application Of Pwa-Based Safety Diagnosis Method In Cstr System, Yuhong Wang, Yang Pu

Journal of System Simulation

Abstract: A safety diagnosis method based on piecewise affine (PWA) model is proposed for ensuring the safety of the petrochemical process. In the method, the petrochemical system is modeled in PWA form which can well describe the nonlinear and hybrid characteristic of the system. Then a formal verification algorithm based on reachable analysis is used to get reachable sets of system states according to the established model. It can predict whether the system is in danger or not in advance so as to take the corresponding measures to ensure the reliability and safety of the system. The proposed method is …

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Unsteady State Diffusion Of Pollutants During Cargo Compartment Fire, Yang Dong, Liu Zhen, Shibin Yang, Xiaozhe Sun Jan 2019

Unsteady State Diffusion Of Pollutants During Cargo Compartment Fire, Yang Dong, Liu Zhen, Shibin Yang, Xiaozhe Sun

Journal of System Simulation

Abstract: The transport of the pollutant gas and smoke in aircraft cargo compartment is investigated numerically on the occurrence of fire disaster. The analysis model based on the volume fire source is established. The 3D unsteady Navier-Stokes equations and transport equations are solved using finite-volume method. The distribution of the temperature is achieved and the unsteady transport principle of pollutant gases and the smoke is analyzed. Numerical results match well with the experiments results, which verifies the correctness of the numerical method. Results show that the ceiling spray behavior is observed when the thermal air is driven by the buoyancy …

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Nonlinear Characteristics Of Transmission System Of Shearer Cutting Unit, Dongsheng Zhang, Haiyang Yu, Jianbo Xu, Li Yan Jan 2019

Nonlinear Characteristics Of Transmission System Of Shearer Cutting Unit, Dongsheng Zhang, Haiyang Yu, Jianbo Xu, Li Yan

Journal of System Simulation

Abstract: The nonlinear dynamics model of gear transmissionsystem of shearer cutting unit is established. The nonlinear dynamics theory of gear is applied to the transmission system of shearer cutting unit, and the effect of damping ratio and vibration frequency on the nonlinear dynamics of the system is considered. Fourth order Runge-Kutta method with variable step is employed to solve the nonlinear systems differential equations. The phase plan and Poincare section of the system response are obtained with different parameters. The results show that the nonlinear influence of the displacement response of the solar wheel is stronger when the damping ratio …

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Design And Realization Of Rfid-Enabled Conwip Strategy For Multi-Echelon Inventory Of Distribution Network, Xiaoju Han, Dingwei Wang Jan 2019

Design And Realization Of Rfid-Enabled Conwip Strategy For Multi-Echelon Inventory Of Distribution Network, Xiaoju Han, Dingwei Wang

Journal of System Simulation

Abstract: Because the RFID technology can visualize the quantity on the way and the inventory status of the supply chain remotely and in real-time,a RFID-enabled electronic card system is designed. The CONWIP control strategy of multi-echelon production inventory system is extended to thedistribution network ofsupply chain.The CONWIPcontrol strategy model is established, and experimental simulation system is exploited. The strategy is compared with the (r,Q) and Push strategies under different network structuresof supply chain. The strategies’ influences on the performance of supply chain are verified by calculating the evaluationindex. Simulation results show that the RFID-Enabled CONWIP strategycan …

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Simulation Of Electronic Transformer In Line With Ft3 Frame Format, Yu Fei, Hailong Zhang, Qingle Sun Jan 2019

Simulation Of Electronic Transformer In Line With Ft3 Frame Format, Yu Fei, Hailong Zhang, Qingle Sun

Journal of System Simulation

Abstract: In the power system, electronic current transformer based on the Rogowski coil has been widely used in digital substation. Based on the analysis of its composition and structure, the electronic transformer is simulated by the Simulink module in Matlab. Rogowski coil is used to simulate the traditional transformer. Using Σ-Δ ADC converter and digital filter, analog signal from the high-pressure side is converted to digital output data, which is sent via fiber optic Ethernet to FPGA development board after FT3 format framing by Simulink. The data is then sent to the merged unit of transformer’s interface after Manchester encoding …

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Study On Vehicle Handling Inverse Dynamics Based On Model Predictive Control Theory, Yingjie Liu, Liu Yun, Shanshan Guo Jan 2019

Study On Vehicle Handling Inverse Dynamics Based On Model Predictive Control Theory, Yingjie Liu, Liu Yun, Shanshan Guo

Journal of System Simulation

Abstract: In order to solve the problem that driver modeling is difficult in vehicle handling dynamics, a study method of vehicle handling inverse dynamics is proposed. Based on model predictive control (MPC), the steering angle input is used as the control variable and the control object is to track the desired path. The optimal control problem of tracking the given path with high speed in vehicle handling inverse dynamics is converted into a secondary planning problem which is then solved by the active set method. The results show that the model predictive control has the advantage of high computing precision …

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Soc Estimation With Extended Kalmanfilter Based On Fuzzy Control, Fang Lei, Chen Yong, Zhao Li, Kangsheng Yin, Zheng Yang Jan 2019

Soc Estimation With Extended Kalmanfilter Based On Fuzzy Control, Fang Lei, Chen Yong, Zhao Li, Kangsheng Yin, Zheng Yang

Journal of System Simulation

Abstract: Many factors affect battery’s state of charge (SOC), such as temperature, charge/discharge rate, cycle life and so on.Extended Kalman filter (EKF) iscommonly used to estimate battery’s SOC.The observation equation’s error affects the accuracy of battery’s SOC estimationusing traditional EKF.Considering the effects of temperature and charge/discharge rateon the observation equation’s error, an SOC estimation method using EKF based on fuzzy controlis presented.Mamdani type fuzzy controller is establishedwiththe proposed method, in which temperature and charge/discharge rateare selected as thecontroller’sinput, and the observation matrix’s correction coefficient isused as thecontroller’s output to improvethe filtering process in real time.The simulationresults show that …

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Data Driven Pre Tuning Adaptive Subspace Model Predictive Control, Han Pu, Liu Miao, Jia Hao Jan 2019

Data Driven Pre Tuning Adaptive Subspace Model Predictive Control, Han Pu, Liu Miao, Jia Hao

Journal of System Simulation

Abstract: The problem of predictive control is investigated for power plant superheated steam temperature system with the characteristics of large delay, large inertia and time-varying. The data driven pre tuning adaptive subspace model predictive control (PTA-MPC) method, which combines the advantages of subspace identification and state space predictive control, is proposed. The state space models of multiple conditions are obtained by subspace identification with the input signal in persistent excitation. The predictive control law is derived with the state space models, and the controller parameters are optimized by using particle swarm optimization (PSO) algorithm. Based on the least square parameter …

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Swept Volume Generation For Virtual Operation Of Micro And Nano-Devices, Xu Wei, Zhao Xin, Guangyi Sun Jan 2019

Swept Volume Generation For Virtual Operation Of Micro And Nano-Devices, Xu Wei, Zhao Xin, Guangyi Sun

Journal of System Simulation

Abstract: With the increasing popularity of computer technology, it becomes important to obtain the swept volume of target objects or spatial point sets, effectively. In order to solve the problem, a voxel-based method is proposed to generate swept volume. OpenMP and C++AMP parallel computing technologies are used for fast voxel-based operation. By using C++ AMP technology, the computing speed is improved greatly. Traditionally, swept volume has been used in the field of path planning and industrial assembly. In this paper, swept volume technology is applied to the simulation of virtual operation of micro and nano-devices for the first time. The …

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Collision Detection Algorithm Of Deformable Object Based On Snake Model Optimization, Li Zhao, Yanxia Jin, Zhipeng Qin, Ren Chao Jan 2019

Collision Detection Algorithm Of Deformable Object Based On Snake Model Optimization, Li Zhao, Yanxia Jin, Zhipeng Qin, Ren Chao

Journal of System Simulation

Abstract: In view of the existing collision detection algorithm which is difficult to solve the collision of real-time and reality, an improved algorithm of collision detection was propsed based on deformable objects. The algorithm based on K-DOPs bounding box applied to update process used the improved PSO algorithm to optimize the Snake model boundary. The concave in collision region, the control point clusters and the center formed multi-linear swarm with the improved selection method and the ulti PSO algorithm. Experimental results show that the improved collision detection algorithm can accurate simulate object contour, simplify the bounding box to …

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Correlation Analysis Model Of Generalized Stochastic System Dynamics, Guangqiu Huang, Qiuqin Lu Jan 2019

Correlation Analysis Model Of Generalized Stochastic System Dynamics, Guangqiu Huang, Qiuqin Lu

Journal of System Simulation

Abstract: In order to solve the problem of system dynamics (SD) simulation and correlation analysis of complex system containing random possesses, the generalized stochastic Petri-net (GSPN) is expanded into the generalized stochastic function Petri-net (GSFPN), and a GSFPN-SD model is proposed by combining GSFPN and SD. The GSFPN-SD model has the following advantages: (1) the process of state evolution is more clear by firing transits; (2) it describes the autonomous dynamic evolution of complex system more realistically as system’s dynamic change is driven by events; (3) transits are fired by tokens' movement, thus the system states can conditionally or …

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Simulation On Step-Mode Invertervoltage Regulator Technology Of Independent Dc, Ximei Liu, Li Xiao, Qingle Sun Jan 2019

Simulation On Step-Mode Invertervoltage Regulator Technology Of Independent Dc, Ximei Liu, Li Xiao, Qingle Sun

Journal of System Simulation

Abstract: Pulse width modulation (PWM) is employed to control the delivery of independent power supply,and applied in the field of inverter with combination of the ladder wave modulation technology.The closed loop control of output voltage is realized by changing the PWM duty cycle with the PI controller. The output voltage of the inverter can be automatically adjusted by the set value, which enables the application in power system and medium/large power motor speed control system.This article introduces the topology of step-mode inverter and design method of 31-levelinverter.The step-mode inverter has characteristics of simple circuit structure, flexible control …

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Dynamic Relaxation Cooperative Optimization Method With Fast Convergence, Chen Jing, Yuchao Lü, Limin Wang Jan 2019

Dynamic Relaxation Cooperative Optimization Method With Fast Convergence, Chen Jing, Yuchao Lü, Limin Wang

Journal of System Simulation

Abstract: To solve problem of high computational cost and low convergence speed of initial points away from the optimal solution in collaborative optimization, a new dynamic relaxation cooperative optimization method with fast convergence is presented. Two-phase optimization is adopted in this method. In the accelerating convergence phase, the calculation method of relaxation factor is improved, and the inconsistent information between the optimal value of disciplines and its mean value is used to construct the relaxation factor. The optimization solution of the first phase is adopted as the initial points in the optimization solution phase. The relaxation factor satisfying the consistent …

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Study On Application Of Hybrid Optimization Algorithm In Parameters Optimization Of Manipulator, Chikun Gong, Yinghui Sun, Lipeng Yuan Jan 2019

Study On Application Of Hybrid Optimization Algorithm In Parameters Optimization Of Manipulator, Chikun Gong, Yinghui Sun, Lipeng Yuan

Journal of System Simulation

Abstract: When the industrial robot carries on the precise processing, it is possible to finish in the work space of the whole attitude. In order to obtain the compact structure and meet the processing point, a new hybrid optimization algorithm is proposed. The structure model of the robot is established, and the global optimal particle and inertia weight of the particle swarm is introduced. The two parameters are classified by the intermediate value. The dynamic changes of the search medium and the optimization ability are enhanced. After verification, the algorithm has better search ability and higher accuracy. Finally, parameter …

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Simulation And Analysis Of Gas Replacement In Sealed Capsule, Xiaohui Guan, Zhou Lin Jan 2019

Simulation And Analysis Of Gas Replacement In Sealed Capsule, Xiaohui Guan, Zhou Lin

Journal of System Simulation

Abstract: The multicomponent gas replacement operations in the sealed capsule with cavities connected by slit are modeled and simulated based on the analytic estimation and the CFD numerical simulation methods in this paper. Corresponding result comparisons and discussions on the time costs and replacement effects of different replacement operations and parameters are presented. The estimation and numerical simulation results of mixing and compression replacement operations with different gas velocities demonstrate that, for the cavity connected by slit, analytic estimation method underestimates the effects of mixing replacement operation, but overestimates the compression replacement effects. During the mixing replacement operation, higher …

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Simulation System For Special Material Processing Training Based On Augmented Reality Technology, Bin Luo, Shuangquan Ge Jan 2019

Simulation System For Special Material Processing Training Based On Augmented Reality Technology, Bin Luo, Shuangquan Ge

Journal of System Simulation

Abstract: A simulation system for special material processing training within the shielded environment is developed based on augmented reality technology. An observation system composed of analogue camera and network high dome system camera is designed and constructed to extend the view scope of operators. Single hand finger recognition technology is then combined with the observation system to implement friendly interactions between operators and the simulation system, and to achieve interactive training. Augmented reality technology is applied to create fused virtual-real vision, which leads to the implementation of augmented processing induction of cone-shaped part. Primary tests show that the developed …

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Research On Balance Cognition Based On Multi-Level Heuristic Dynamic Programming Of Flexible Robot, Chen Jing Jan 2019

Research On Balance Cognition Based On Multi-Level Heuristic Dynamic Programming Of Flexible Robot, Chen Jing

Journal of System Simulation

Abstract: Aiming at the stable self-balancing cognition problems of flexible self-balancing robot, a balance cognition method based on multi-level heuristic dynamic programming is proposed and applied on the self-balance learning of flexible self-balancing robot in this paper. In the proposed cognition method, the original reward mechanism with discrete form is transformed into a continuous form by introducing the orientational reward module, and the converted continuous reward signal is used as the major basis for evaluation. The scheme enables the robot to record more information in the autonomic cognition process and improve its cognitive ability. Through the robot self-balancing …

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Dual Channel Maneuver Flight Control Based On Dynamic Inverse And Dynamic Sliding Mode, Shengyi Yang, Liu Chao, Shengjing Tang, Weili Yang Jan 2019

Dual Channel Maneuver Flight Control Based On Dynamic Inverse And Dynamic Sliding Mode, Shengyi Yang, Liu Chao, Shengjing Tang, Weili Yang

Journal of System Simulation

Abstract: In order to solve the flight control problem of mini quadrotor with large angle and fast maneuver, a new dual channel maneuver flight control method based on dynamic inverse (DI) and sliding mode control (SMC) is proposed. By combining SMC and DI, this method makes the system robust to the model uncertainty and aerodynamic interference. The dynamic SMC effectively reduces system’s chattering. New sliding mode surface and quaternion regular model of aircraft attitude are built to improve the control precision and resolve the singular problem of aircraft. The DI improves the system’s dynamic response, and …

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Numerical Simulation Of Thermal Comfort And Pm10 Concentration Distribution In A320 Aircraft Cabin, Jiaquan Lin, Ruiting Wang Jan 2019

Numerical Simulation Of Thermal Comfort And Pm10 Concentration Distribution In A320 Aircraft Cabin, Jiaquan Lin, Ruiting Wang

Journal of System Simulation

Abstract: A model of A320 aircraft cabin and human body was established using CFD. Temperature field, velocity field and PM10 concentration field was simulated at different air supply rate of the bridge load air conditioning based on mathematical model of fluid dynamics in cabin. The values of the ADPI and drainage efficiency were calculated respectively at different air supply rate. The optimal supply air velocity evaluation function was constructed based on ADPI and drainage efficiency. The wind speed, temperature and PM10 concentration of the sample points were used to calculate the value of the evaluation function with different …

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Modeling And Simulation Of Potential Detection System Based On Woven Electrode, Longfei Li, Yongsheng Ding Jan 2019

Modeling And Simulation Of Potential Detection System Based On Woven Electrode, Longfei Li, Yongsheng Ding

Journal of System Simulation

Abstract: Range of interlacing resistance of woven electrode is induced. Mathematical models of field point potential, electrode potential and electrode potentials difference are constructed. Electrode potential is the weighted mean of field point potentials at interlacing points. Effects of position, size of electrode, and contact resistance on electrode potential are investigated by simulation. Results indicate that there exists two extreme value points at which electrode potential reaches maximum and minimum, respectively. The absolute value of electrode potential extreme value decreases with the increase of electrode’s size. The electrode potential is independent of contact resistance if the expectation of contact resistance …

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