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Operations Research, Systems Engineering and Industrial Engineering Commons™
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Articles 2161 - 2190 of 3880
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Study On Operation Mechanism Of Mixed Closed Loop Transportation Network With Exponential Queues, Li Bing, Xuan Hua, Li Jing
Study On Operation Mechanism Of Mixed Closed Loop Transportation Network With Exponential Queues, Li Bing, Xuan Hua, Li Jing
Journal of System Simulation
Abstract: Mixed transport queuing network is composed of single route station road and multiple route station as parallel and series form. Two random variables to denote respectively time interval of vehicle arriving freight station and the service time of these handling platforms in freight station obeyed negative exponential distribution. The closed mixed transportation queuing network was simulated using SimEvents module in Matlab software. The dynamic changes of the queue length and waiting time in freight station were analyzed. Then vehicle distribution in mixed closed loop transportation network was analyzed. The formulation to compute vehicle distribution probability in steady state was …
Review On Modeling And Simulation Of Critical Infrastructures, Baoliang Xiao, Mingzhi Zhang, Xiaoyuan He
Review On Modeling And Simulation Of Critical Infrastructures, Baoliang Xiao, Mingzhi Zhang, Xiaoyuan He
Journal of System Simulation
Abstract: Economic prosperity, national security and society well-being have long depended on the important services that some critical infrastructures are provided. The safety of the critical infrastructures is vital for the normal operation of the country. On the basis of research on the connotation of critical infrastructure to different nation in different historical period, the definition, classification and model of interdependencies among critical infrastructures were analyzed. The principal modeling and simulation techniques of critical infrastructure and their merits and drawbacks were summarized. The significant protection projection s and tools were analyzed and researched. Depending on all above studies, knowing …
Fire Reconstruction Method Based On Les And Linear Programming, Guangyao Yao, Peizhong Yang, Tan Xun
Fire Reconstruction Method Based On Les And Linear Programming, Guangyao Yao, Peizhong Yang, Tan Xun
Journal of System Simulation
Abstract: A method based on LES and linear programming was proposed for the numerical construction of fire accident. In the simulation with LES method, all the quantities were decomposed into large-scale components and small-scale components. For large-scale components, the direct simulation method was used. For small-scale components, the subgrid model was used. The LES method could improve the simulation accuracy. In the linear programming method, the parameters were locally linearized to solve the optimization problem. It could improve the simulation efficiency. The method was applied to the numerical reconstruction of a wholesale market fire in Shanghai. The spread of fire …
Compressed-Sensing Based Up-Sampling Method For Fluid Simulation, Yijing Qian, Xubo Yang
Compressed-Sensing Based Up-Sampling Method For Fluid Simulation, Yijing Qian, Xubo Yang
Journal of System Simulation
Abstract: In computer fluid animation, the grid-based Euler method is a well-matured and effective way of simulating fluids, but a key bottleneck of Euler method is that it is limited to the traditional Nyquist-Shannon sampling theorem in sampling step. So it cannot effectively reduce the massive data and computing of the large-scale flow fields. In order to solve this problem, compressed sensing theory was used to probe a way to break through the limitation of the sampling theorem in fluid simulation. The sparsity and compressibility of fluid data were explored, then applicable sampling function, compressive basis and reconstruction algorithm for …
Modeling Research On Dynamic Pressure Distribution Of Pilot Body In Maneuver Flight, Liu Gang, Yunpu Wang, Hongwei Chi, Hongyin Yuan
Modeling Research On Dynamic Pressure Distribution Of Pilot Body In Maneuver Flight, Liu Gang, Yunpu Wang, Hongwei Chi, Hongyin Yuan
Journal of System Simulation
Abstract: Relationship between dynamic surface forces distribution of pilot body and flight load in maneuver flight was studied. Dynamic surface pressure and shear distribution of pilot body seated posture were expressed by setting up dynamic pressure factor and dynamic shear factor. Flight kinetic equations of pilot body seated posture were established. In the equations, relationship between pilot body inertia forces and dynamic surface forces were given, and the equations are square nonlinear for dynamic pressure factor and shear factor. Finally an example for climbing turn maneuver flight of some aircraft was done, dynamic surface forces distribution of pilot …
Numerical Simulation Of Hot And Cold Fluids Mixing In A Tee-Junction, Wenli Wei, Yunfei Hong, Shipeng Shao, Yuling Liu
Numerical Simulation Of Hot And Cold Fluids Mixing In A Tee-Junction, Wenli Wei, Yunfei Hong, Shipeng Shao, Yuling Liu
Journal of System Simulation
Abstract: Flow and heat transfer model in tee junction was established and the 3D RNG k-ε turbulence model was completed to simulate the process of mixing and capture the information of velocity and temperature. The simulation results and measured data of the mean value of velocity and temperature were analyzed and compared, and are in a good agreement, which indicates that the RNG k-ε model combined with the heat transfer model can well simulate the hydraulic characteristics and heat transfer mechanism of hot and cold fluids in a tee junction. Furthermore, the upstream segment of a tee junction has two …
Research On Fault Diagnosis For Pitch Sensors Of Wind Turbines, Yanjie Zhai, Dinghui Wu, Yiyang Li, Zhicheng Ji
Research On Fault Diagnosis For Pitch Sensors Of Wind Turbines, Yanjie Zhai, Dinghui Wu, Yiyang Li, Zhicheng Ji
Journal of System Simulation
Abstract: Considering the biased output fault of pitch sensors for wind turbines, a fault diagnosis method based on the multi-innovation kalman filter algorithm was proposed. The corresponding relationship between the change of the pitch angle and the tiny displacement produced by the force acting on the tower was established according to the mechanical structure characteristics of wind turbines. More accurate estimated value for the tiny displacement was achieved by using the multi-innovation kalman filter algorithm which had higher convergence speed and estimation accuracy to reduce the large noise of the output information generated by sensors. The fault could be detected …
Research On Methods For Transformation Of Declarative Model For Semi-Physical Simulation, Weijian Huang, Jianwan Ding, Liping Chen, Zhaoyuan Zhou
Research On Methods For Transformation Of Declarative Model For Semi-Physical Simulation, Weijian Huang, Jianwan Ding, Liping Chen, Zhaoyuan Zhou
Journal of System Simulation
Abstract: A new method for the transformation from the declarative model to the model for semi-physical simulation was proposed aiming at semi-physical simulation. By analyzing the mathematical form of the declarative model and the model for semi-physical simulation, based on bipartite graph, the mathematical form of declarative model to the mathematical form of the model for semi-physical simulation was transformed through decomposition based on bipartite graph and tearing the algebraic loop, using clutch model as the model transformation examples. The declarative model transforming idea has overcome the disadvantages of process modeling method such as considering the causality, difficult …
Numerical Simulation About Fuel Injection Source Location Impacting On Turbulent Combustion Process, Sun Hui, Guangcheng Cai, Jiang Lin, Shibo Wang
Numerical Simulation About Fuel Injection Source Location Impacting On Turbulent Combustion Process, Sun Hui, Guangcheng Cai, Jiang Lin, Shibo Wang
Journal of System Simulation
Abstract: Fuel injection source location has very important influence on combustion process. It determines the location of the furnace flame. The three dimensional model of the furnace was established by the numerical simulation method. Under different conditions, the fuel injection source location on the temperature field within the furnace, the pollutant concentration field, and the flow field distribution inside the furnace combustion process were investigated. The results were compared and analyzed. After analysis, the results show that the fuel injection source location from 1.1 ~ 1.5 meter process of change, the average temperature within the furnace continue to rise, the …
Image Saliency Analysis Based On Grey Relational Computation And Prior Combination, Qiangqiang Zhou, Zhicheng Wang, Weidong Zhao, Yufei Chen, Wang Gang
Image Saliency Analysis Based On Grey Relational Computation And Prior Combination, Qiangqiang Zhou, Zhicheng Wang, Weidong Zhao, Yufei Chen, Wang Gang
Journal of System Simulation
Abstract: An image saliency analysis method based on the combination of grey relational computation and prior knowledge, which is a saliency computation and integration based on three different priori of boundary background, global color distribution and top salient information. The SLIC method segment the image into superpixels, then selecting the boundary superpixels on four image sides respectively to construct the reference sequence, and the same method used to construct the comparative sequence of the rest superpixels. Then four initial saliency images was derived based on boundary background priori through a grey relational computation, to make weighted and …
Improved Crack Removing Algorithm For Quad-Tree Terrain Rendering, Wan Ming, Liang Xia, Fengming Zhang
Improved Crack Removing Algorithm For Quad-Tree Terrain Rendering, Wan Ming, Liang Xia, Fengming Zhang
Journal of System Simulation
Abstract: In 3D large scale multi-resolution terrain rendering, an improved algorithm based on LOD control and visibility for crack removing was proposed. It is proved that quad-tree grid is restricted while the ratio of visible distance to grid extent is large than 3. In preprocess stage, cracks were classified to raise crack and dropped crack, and crack patches with the same size as cracks were generated and attached to the latter. In real-time rendering stage, no special calculation by CPU for restriction of level of detail or for crack removing between adjacent grids was needed. Example shows that …
Chaos Analysis For Tcp Congestion Control In Heterogeneous Networks, Xuhui Wei, Wang Hui
Chaos Analysis For Tcp Congestion Control In Heterogeneous Networks, Xuhui Wei, Wang Hui
Journal of System Simulation
Abstract: In order to study the chaos nature of TCP in Heterogeneous Network, the major features were demonstrated such as periodicity, sensitivity to initial conditions (butterfly effect), and strange attractor of chaotic system by analyzing parameters in Heterogeneous Network proving that TCP shows chaos nature in Heterogeneous Network in certain situations. Numerical examples show that in the case of system with low bottleneck link, the system shows fine periodic and stable behavior, and there is no TCP deadlock phenomenon in the heterogeneous network system. In the case of system with larger bottleneck link, the system shows chaotic. And a …
Design And Motion Control Of Four-Wheel Automotive Chassis Inspection Robot, Jue Zhu, Yongbin Huang, Zhang He
Design And Motion Control Of Four-Wheel Automotive Chassis Inspection Robot, Jue Zhu, Yongbin Huang, Zhang He
Journal of System Simulation
Abstract: The system structure of an automobile chassis inspection robot was introduced. Furthermore the equation of motion state of robot was established and a decoupling controller was designed. The robot with omnidirectional wheel moving mechanism achieved the chassis image acquisition with wireless camera system and employed the active disturbance rejection controller for motion control. The robot has the characters of wide applicability, flexibility of platform movement, the stability of motion state, which can effectively compensate for the lack of traditional inspection methods, and a reasonable design in automobile chassis inspection is proved. The motion equation of state established for omnidirectional …
Adaptive Multichannel Double L-Shaped Microphone Array Sound Source Localization Algorithm, Yecai Guo, Sainan Zhu, Zhang Ning
Adaptive Multichannel Double L-Shaped Microphone Array Sound Source Localization Algorithm, Yecai Guo, Sainan Zhu, Zhang Ning
Journal of System Simulation
Abstract: Aiming at the lack of ability to resist noise and reverberation and the location estimation low accuracy for the sound source localization method based on microphone array in the indoor sound environments, a sound source localization algorithm based on adaptive multichannel double L-shaped microphone array was proposed. In this proposed algorithm, normalized multichannel frequency-domain least mean square algorithm was used to estimate the impulse responses of different array elements and acquire the time delay under condition of the single source and multiple reverberation model, the spectrum energy was modified by penalty function to improve the ability to suppress noise …
Cqpso Algorithm Based Control System Parameter Optimization, Genyuan Wei, Xinqiang Feng, Han Pu
Cqpso Algorithm Based Control System Parameter Optimization, Genyuan Wei, Xinqiang Feng, Han Pu
Journal of System Simulation
Abstract: According to the shortcomings of optimization methods of control system parameters, and the result of PSO algorithm usually falling into the partial optimum, Chaos Search and Quantum Space Search were added to the PSO algorithm, constituting the Chaos Quantum Particle Swarm Optimization algorithm, which was applied to the typical thermal control system parameters optimization. Introducing the selection of object functions of control system parameter optimization, describing the CQPSO algorithm process, the CQPSO algorithm was tested and analyzed through multiple test functions. The result shows that, compared with PSO and CPSO algorithm, CQPSO algorithm makes the particle swarm get out …
Perception Factors Analysis Of Command Information Process Based On System Dynamics, Pubing Shen, Gao Kai, Weiwei Zhao
Perception Factors Analysis Of Command Information Process Based On System Dynamics, Pubing Shen, Gao Kai, Weiwei Zhao
Journal of System Simulation
Abstract: The major aspects of operational command processes were investigated and the key factors that influenced the operation process were analyzed. The confront model of command information process was constructed based on Information Age Combat Model (IACM) by the system dynamics theory and modeling methods. Through the experiment, major factors of perceptual element in the model were simulated and statistically analyzed. An inverse linear relationship of attack forces in both sides was found to be existed. These were verified by the experiment and combat capacity could be improved by increasing the number of perception nodes and rate of information collection …
Risk Analysis Of Passenger Car Moving On Curved Sections Based On Sideslip Microscopic Simulation, Zhang Chi, Dongjian Shao, Zhang Min
Risk Analysis Of Passenger Car Moving On Curved Sections Based On Sideslip Microscopic Simulation, Zhang Chi, Dongjian Shao, Zhang Min
Journal of System Simulation
Abstract: In consideration of rainfall and over-speeding, the risk of passenger car moving on curved sections was analyzed synthetically. The simulation model of the dynamic characteristic of passenger car was established using Carsim, the critical adhesion coefficient was used as the evaluation index of passenger car moving risk, and the evaluation model of passenger car moving on curved sections was established using Matlab. The results show that under the situation of design speed 80km/h, when driving speed exceeds 96km/h, the risk probability of passenger car moving on rainfall curved sections exceeds 48.40%; when the rainfall intensity is bigger than …
Estimation Of Contamination Source By Using Qpso With Perturbation Operator, Tian Na, Zhicheng Ji
Estimation Of Contamination Source By Using Qpso With Perturbation Operator, Tian Na, Zhicheng Ji
Journal of System Simulation
Abstract: An improved quantum-behaved particle swarm optimization (QPSO) with perturbation operator was proposed and applied to solve the convection-diffusion inverse problem of estimating time-varying contamination source. Because the contamination source is time-dependent, the inverse problems are classified into function estimation problem. To transform the inverse problem to optimization problem, the nonlinear least square method was used. Meanwhile, Tikhonov regularization was used to stablize the solution with noisy measured data. And the regularization parameter was chosen by L-curve method. The simulation results tell that QPSO with perturbation operator outperforms QPSO and PSO. Moreover, tests over different views (regularization terms, noise level, …
Simulation Research On Cantilever Piezoelectric Generator With Mass, Yan Zhen, He Qing, Dongping Wang
Simulation Research On Cantilever Piezoelectric Generator With Mass, Yan Zhen, He Qing, Dongping Wang
Journal of System Simulation
Abstract: Piezoelectric vibration generator made in MEMS can supply infinitely and continuously energy for low power electronic devices. In order to improve the adaptive capacity to environment of cantilever piezoelectric vibration generator, through the finite element simulation and experimental study, effect law of additional mass on the natural frequencies and output voltage was analyzed. Results show that, as the mass increases, natural frequency of the piezoelectric beam decreases monotonically, while relative displacement of the end monotonically increases; in the same incentive environment, output voltage of piezoelectric beam with close to the natural frequency and same to the end amplitude are …
Robust Coordinated Motion Control Of Free-Floating Space Robot With Flexible-Link And Flexible-Joints, Xiaoyan Yu, Chen Li
Robust Coordinated Motion Control Of Free-Floating Space Robot With Flexible-Link And Flexible-Joints, Xiaoyan Yu, Chen Li
Journal of System Simulation
Abstract: Robust coordinated motion control and vibration hierarchical suppression of a free-floating space robot with one flexible link and two elastic revolute joints was proposed. The dynamical Lagrange equation was established by the momentum conservation. A singularly perturbed model was formulated, which consists of a slow subsystem and two fast subsystems. Based on the singularly perturbed model, a reduced-order controller was proposed, which consists of a robust slow control component and two fast control components. The virtue of this control scheme is that the linear position, linear velocity, linear acceleration of the base needn’t be measured directly. …
Modeling And Simulation For Ultra Supercritical Units Load Regulation By Condensate Throttling, Junjie Gu, Wang Peng
Modeling And Simulation For Ultra Supercritical Units Load Regulation By Condensate Throttling, Junjie Gu, Wang Peng
Journal of System Simulation
Abstract: Dynamic model of the condensate flow and load of ultra supercritical units was given. Reasonable inference and simplified were made by the conservation of volume, conservation of mass and conservation of energy and dynamic model of the condensate flow and load of supercritical units was offered, which could provide theoretical basis for the implement of the power plant condensate throttling and load control. Taking a 1000 MW ultra supercritical unit as an example, simulation of the model was made and compared. Results show that the gain coefficient and the time constant of the transfer function of the condensate …
Signal Denoising Method Based On Atom Curve Fitting Improved Dictionary Learning, Gao Bo, Wang Jun, Gege Zhang
Signal Denoising Method Based On Atom Curve Fitting Improved Dictionary Learning, Gao Bo, Wang Jun, Gege Zhang
Journal of System Simulation
Abstract: In signal denoising problems, using K-SVD and other classic dictionary learning algorithm can not effectively eliminate the noise impact. The method made some amendments for classical dictionary learning by applying nonlinear least squares curve fitting and particle swarm optimization. K-SVD algorithm was used to train the dictionary. Nonlinear least-squares approach was used to fit every atom in the dictionary. Particle swarm optimization method was used to solve the sparse representation of the signal. The reconstructed signal was obtained. The experimental results show that, the denoising effects of the proposed method apparently has increased compared with K-SVD and RLS-DLA.
Protocol Algorithm Design Of Location Privacy Preserving For Sink Node Based On Security Area, Peiyu Li, Zhixue Zhang
Protocol Algorithm Design Of Location Privacy Preserving For Sink Node Based On Security Area, Peiyu Li, Zhixue Zhang
Journal of System Simulation
Abstract: In view of problems appear in location privacy protection for sink node of wireless sensor networks, a location privacy preserving routing algorithm for sink node based on security area was proposed. This protocol protected location privacy of sink node through methods such as sending real package or fake package probabilistic from safe area to unsafe area and forming a circular sink area around the sink node. Performance evaluation was compared between this proposed dynamic routing algorithm and existing one. Network simulation results show that the routing algorithm has advantages such as low energy consumption, small network delay, and …
Energy Saving Control Research On Mine Drainage System Based On Model Predictive Control, Zhiling Ren, Jiahao Han
Energy Saving Control Research On Mine Drainage System Based On Model Predictive Control, Zhiling Ren, Jiahao Han
Journal of System Simulation
Abstract: Grey model of water inflow in tunnel and time with measuring data and economic model was established after analysis for energy conservation issue of mine drainage system. Using model predictive control, a coal mines pumping water pump scheduling in non-peak periods was establish, executing the simulation of the gray model based on model predictive control and predicting the water inflow at times of peak demand in morning and evening. A load shifting schedule for system was formulated. The result show that the pump scheduling established in non-peak periods based on model predictive control can reduce the cost of electricity …
Numerical Simulation And Experimental Study Of Three-Dimensional Flow Field On Roots-Type Power Machine Based On Dynamic Mesh Technique, Yanjun Xiao, Yuxiang Liu, Dayuan Wang, Feng Hua, Chunxia Li
Numerical Simulation And Experimental Study Of Three-Dimensional Flow Field On Roots-Type Power Machine Based On Dynamic Mesh Technique, Yanjun Xiao, Yuxiang Liu, Dayuan Wang, Feng Hua, Chunxia Li
Journal of System Simulation
Abstract: A new roots-type power machine was recommended. As for it, the working fluid of low pressure waste heat according was simulated to both the different operating conditions and the different intake and exhaust pressure and flow, and the changing process of internal flow field over time period using dynamic mesh technique was simulated when the power machine was in rotating work. The pressure field, velocity field and mass flow rate with the simulation results were analyzed, thus reaching the optimum operating conditions and the key parameters of the roots-type power machine. A test platform and conducted field tests was …
Simulation Method Of Ultrasonic Signal Echo From Measured Liquid Level, Li Peng, Xiaolong Shen, Qian Yin
Simulation Method Of Ultrasonic Signal Echo From Measured Liquid Level, Li Peng, Xiaolong Shen, Qian Yin
Journal of System Simulation
Abstract: Based on the ultrasonic wave scattering theory, a simulation method for the ultrasonic signal echo from liquid level was proposed. According to the fluid boundary-layer theory, the liquid level was divided into a four-layer structure, including liquid phase, gas phase, and liquid and gas stagnant layer. Furthermore, every phase was divided into lots of small scatters, and their scattering intensity was set on the basis of the concentration of water molecule. Thus, the echo signal was the sum of reflecting signals from all scatters. Besides, the simulated signal was compared with the real one with the same system parameter …
Ontology Based Devs Modeling Method, Rong Gang, Xiao Jun, Yunping Hu, Yiping Feng
Ontology Based Devs Modeling Method, Rong Gang, Xiao Jun, Yunping Hu, Yiping Feng
Journal of System Simulation
Abstract: In the field of modeling and simulation, it’s difficult to reuse the models because the models and simulation system are coupled seriously. The Ontology-driven modeling theory is a simulation modeling methodology for model reuse. A new DEVS modeling method was proposed based on this theory. The DEVS modeling ontology DEVSMO was built and the DEVS model could be described as the instance of the DEVSMO. This form of DEVS model was independent of the DEVS simulation environment, which improved the model reusability. A tool was developed to translate the DEVSMO instance to DEVS executable models to verify the …
Simulation Research On Impact Of Consumer Bounded Rationality On Optimal Pricing Strategy In Supply Chain, Li Feng, Wei Ying
Simulation Research On Impact Of Consumer Bounded Rationality On Optimal Pricing Strategy In Supply Chain, Li Feng, Wei Ying
Journal of System Simulation
Abstract: Noticing increasing market responses to online sales channel, the impact of bounded rationality of consumer on pricing strategy was studied in a dual-channel supply chain system, which consists of one manufacturer and one retailer. A multiple-agent based modeling and simulation approach was proposed and employed. In a Stackelberg game setting with the manufacturer the leader, optimal pricing decisions were calculated from the simulation model. Impacts of consumer behavior parameters on channel prices and sales revenue were analyzed, i.e., degree of consumer bounded rationality, consumer’s acceptance of online channel, as well as consumer’s valuation distribution to the product. Results …
Modeling And Scheduling Of Reentrant Automatic Assembly Equipment Based On Cpn Tools, Zhang Mei, Guangsen Chen, You Jia
Modeling And Scheduling Of Reentrant Automatic Assembly Equipment Based On Cpn Tools, Zhang Mei, Guangsen Chen, You Jia
Journal of System Simulation
Abstract: The idea about treating automatic immunoassay detection equipment as a reentrant dual-armed automatic assembly equipment was brought forward. Using timed colored Petri nets (TCPN) to model the equipment according to its detection, the performance of model and simulation experiment were evaluated. To optimize the detection process, DPC dynamic feeding strategy and LSPON, FIFO scheduling strategy were designed. Based on that, a hybrid control strategy was proposed to schedule the model more efficiently. Batch-detecting projects of different scale examples were scheduled on the platform of CPN tools according to the strategies above. The simulation results illustrate the reasonability and feasibility …
Improved Quantum-Behaved Particle Swarm Optimization For Solving Multi-Objective Flexible Job-Shop Scheduling Problems, Tian Na, Zhicheng Ji
Improved Quantum-Behaved Particle Swarm Optimization For Solving Multi-Objective Flexible Job-Shop Scheduling Problems, Tian Na, Zhicheng Ji
Journal of System Simulation
Abstract: Due to the complexity of flexible job-shop scheduling problem (FJSP), it is still the hot topic for research. FJSP was given deep insight into with three objectives to be minimized simultaneously: makespan, maximal machine workload and total workload. Quantum-behaved particle swarm optimization (QPSO) with different coefficient selection methods was compared. The benchmark function tests show that QPSO with adaptive coefficient outperforms other selection methods in unimodal functions, while QPSO with cosine coefficient performs better in multi-modal functions. Therefore, QPSO with cosine decreasing coefficient is adopted to solve the multi-objective FJSP, which is a complex multi-modal optimization problem. Simulation results …