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Articles 4561 - 4590 of 13564

Full-Text Articles in Computer Engineering

Research And Implementation Of Question Answering System Oriented Wargaming Based On Aiml, Zejian Sun, Guangya Si, Liu Yang Jun 2020

Research And Implementation Of Question Answering System Oriented Wargaming Based On Aiml, Zejian Sun, Guangya Si, Liu Yang

Journal of System Simulation

Abstract: Wargaming exercise is an important means of combat simulation, but the high query and operation threshold of wargaming system limit its use and extension. Through investigating the actual operation process of a wargaming exercise, collecting and analyzing the trainees use requirements, the intelligent question answering system centering on access to the database by making knowledge documents, index tables and access modules was designed based on AIML(Artificial Intelligence Markup Language) and ALICE program, adopted heuristic rules. The implementation of question answering system made commanders participating in wargaming query data by natural language, provided ideas for the further improvement of wargaming …

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Cloud Manufacturing Resource Discovery Method Based On Eav Model And Solr, Geng Chao, Shiyou Qu, Yingying Xiao, Guoqiang Shi, Tingyu Lin, Liqin Guo, Xiaowei Wang Jun 2020

Cloud Manufacturing Resource Discovery Method Based On Eav Model And Solr, Geng Chao, Shiyou Qu, Yingying Xiao, Guoqiang Shi, Tingyu Lin, Liqin Guo, Xiaowei Wang

Journal of System Simulation

Abstract: A resource discovery solution of cloud manufacturing based on text information processing technology was proposed. This solution converted the description model of cloud manufacturing resource to a formal model of text information processing via a mapping function, and an EAV (Entity-Attribute-Value) derived model of cloud manufacturing resources was designed to solve the resource properties issues of heterogeneity, diversity, dynamic and so on. By introducing the Solr index schema, the text indexing system of resource properties data was built to improve query performance of related data. A prototype system was designed for discovering cloud manufacturing resources based on …

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Dynamic Simulation And Analysis Of The Taxiing Turning Process Of Aircraft, Zhang Qian, Yingshu Zhang Jun 2020

Dynamic Simulation And Analysis Of The Taxiing Turning Process Of Aircraft, Zhang Qian, Yingshu Zhang

Journal of System Simulation

Abstract: To solvethe problem that a certain type of aircraft couldn't turn easily during taxiing,a research was carried out concerning the dynamic taxiing process simulation of the aircraft when only differential brake could be used for turning. After analyzing the aircraft turning process, and applying the software of Matlab, dynamic model of the turning process was established in the Simulink environment. After running the model, studying and analyzing the simulation results, the correspondence between the differential brake turning requirements and the performance of the wheel and brake control system was obtained. Usingthe simulation method,the turning difficult fault is reappeared,the mechanism …

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Dynamics Analysis Of Flue Gas Compression System In Oxy-Coal Fired Boiler, Jianqiang Gao, Zhang Chen Jun 2020

Dynamics Analysis Of Flue Gas Compression System In Oxy-Coal Fired Boiler, Jianqiang Gao, Zhang Chen

Journal of System Simulation

Abstract: Taking the flue gas compression system in a 300MW oxy-coal fired boiler unit as an object of study by concept design, math model of gas compressor and gas cooler were established with the method of lumped parameter, and dynamic simulation of flue gas compression system was developed. The disturbance experiments on coal-feeder speed and flue gas compressor speed, etc. were carried out based on B-MCR stable condition. As a result, the operating parameters of gas compressor have a more sensitive response and larger change magnitude when the perturbation of coal feeder speed and gas compressor speed is disturbed; when …

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Air Command And Support Heterogeneous Systems Integration Technology Supporting Lvc Simulation, Yongliang Luo, Zhang Jun, Yuping Xiong, Zhihui Zhang, Yuanhui Qin Jun 2020

Air Command And Support Heterogeneous Systems Integration Technology Supporting Lvc Simulation, Yongliang Luo, Zhang Jun, Yuping Xiong, Zhihui Zhang, Yuanhui Qin

Journal of System Simulation

Abstract: To solve the integration of heterogeneous simulation systems or platforms based on different communication protocols, a heterogeneous system integration technology of Air Command and Security System (ACSS) for LVC simulation was proposed combined with ACSS integrated simulation requirements. By analyzing the characteristics and requirements of air command and support LVC simulation system, an integrated framework of air command and LVC simulation system on the basis of existing heterogeneous system integration technology and data center was proposed. Those aspects such as resource layer, middleware layer, core service layer, application layer and so on were introduced. An integrated framework for command …

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Design Of Multi-Scenario Simulation Of Molten Iron Logistics System With Cranes And Cross-Train Agvs, Shaowen Lu, Xiaochuan Luo Jun 2020

Design Of Multi-Scenario Simulation Of Molten Iron Logistics System With Cranes And Cross-Train Agvs, Shaowen Lu, Xiaochuan Luo

Journal of System Simulation

Abstract: Iron and steel complexes prefer a new molten iron logistics technology which involves cranes and cross-train AGVs (Automated Guided Vehicle) for transportation. The key concern of decision-makers is how to evaluate the safety and performance of the logistics design. For using simulation, it needs to solve the multi-scenario what-if simulation problems caused by uncertain processing time and crane yielding. An object-oriented simulation design method and finite state automata based modeling techniques were introduced. A multi-scenario simulation procedure was introduced. The proposed techniques can improve the flexibility, configurability and reusability of the simulation system effectively.

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Model-Based Design And Simulation For An Aircraft Flight Control System, Chi Yue, Shan Dong, Zhenxin Yan, Hei Peng Jun 2020

Model-Based Design And Simulation For An Aircraft Flight Control System, Chi Yue, Shan Dong, Zhenxin Yan, Hei Peng

Journal of System Simulation

Abstract: The process and method of model-based system engineering (MBSE) and its implementation in highly complex flight control system were clearly introduced. By comparing with traditional design methods, MBSE applied models as baseline instead of documents to handle the complexity of modern systems. The top-down workflow is more capable of ensuring coherence of design process, completeness of requirements verification and system testability. With the simulation of system model, the integrality of design and verification process, system function behavior simulation, implementation of the failure mode, effect analysis (FMEA) and the decreasing of system risk grade are well achieved.

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Real-Time Control Method Of Hsss Based On Single Phrase Self Decoupling Strategy, Yingping Yi, Bogang Qu, Zhang Yang Jun 2020

Real-Time Control Method Of Hsss Based On Single Phrase Self Decoupling Strategy, Yingping Yi, Bogang Qu, Zhang Yang

Journal of System Simulation

Abstract: Zero Crossing Detection (ZCD) and phase locked loop are widely applied in the real-time control. Compared the performances of ZCD, SSRF SPLL and DDSRF SPLL,a method named as Single Phase Self Decoupling SPLL (SPSD SPLL) for HSSS(Hybrid Solid State Switch) is proposed and the mathematical method and control methods are given. The control parameters were obtained by analyzing the steady and dynamic performance of SPSD SPLL. By establishing the real-time controlling models based on the above strategies and HSSS model in the MATLAB/Simulink, the simulation and optimization analysis results verified that the SPSD SPLL was well performed …

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Simulation And Verification For Low Altitude Ground Reflection Characteristics Of Low-Frequency Broadband Signal, Zhannan Ma, Feifei Du, Jinxi Chen Jun 2020

Simulation And Verification For Low Altitude Ground Reflection Characteristics Of Low-Frequency Broadband Signal, Zhannan Ma, Feifei Du, Jinxi Chen

Journal of System Simulation

Abstract: Low frequency broadband signals have advantages in improving radar target recognition ability. To determine the ground reflectance of broadband signal at low altitude, the ground reflectance of different frequency points of narrowband is used to compose the equivalent ground reflectance of broadband signal based on ground reflection model. The relationship between ground reflectance and ground characteristics (relative dielectric constant, conductivity), grazing angle, and polarization characteristics were discussed in detail. The reflectance in typical environment was verified using the method of antenna pattern test at low altitude. Results show that the reflectance simulation model was effective, and the model provides …

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Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei Jun 2020

Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei

Journal of System Simulation

Abstract: A new method measuring the atmospheric parameters was proposed based on acoustic vector sensors located at the wing leading edge, and the atmospheric parameters model was set up based on the airflow velocity distribution sensed by acoustic vector sensor over wing leading edge. According to the symmetric, swept character of wings, velocity vector was decomposed to solve the non-linear equation of model. The expressions of angle of sideslip, angle of attack and free stream velocity were derived. The feasibility of the expressions was verified by wing simulation data from Fluent.

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Fractional Modeling And Simulation Analysis Of Single-Phase Pwm Rectifier, Zheng Zheng, Fangjun Ma, Yanfang Wei Jun 2020

Fractional Modeling And Simulation Analysis Of Single-Phase Pwm Rectifier, Zheng Zheng, Fangjun Ma, Yanfang Wei

Journal of System Simulation

Abstract: The modeling problem of single-phase PWM rectifier was studied, based on the fact that actual capacitance and inductance is the fractional in nature. The mathematical model of single-phase PWM rectifier was established by using fractional calculus theory, based on modeling method analysis of fractional Caputo definition and PWM rectifier topology. According to instantaneous power theory, for DC component value, the peak to peak value AC component, and the time of dynamic response of the DC side capacitor voltage were analyzed. In theory, DC component value does not change with the order number capacitance, while the AC component is opposite, …

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Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu Jun 2020

Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu

Journal of System Simulation

Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG k–ε turbulent model was used to close the two-phase flow time-averaged equations. The conditions properties of free hydraulic jumps on corrugated beds with a stilling basin under 9 kinds of conditions were studied by numerical simulation. Simulation research results show: There are vortexes generated by corrugated beds surfaces, rotating in the clockwise direction. The pressure distribution on corrugated beds in hydraulic jump region appears a wavy change, and the difference between the pressure values at adjacent crest and trough gradually decreases along …

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Dynamic Simulation For Tethered Trailer Vehicle, Chen Ning, Hongchao Ma Jun 2020

Dynamic Simulation For Tethered Trailer Vehicle, Chen Ning, Hongchao Ma

Journal of System Simulation

Abstract: Tethered trailer vehicle is a non professional tractor that drags an unpowered vehicle with hemp rope. This conduct has many problems: poor operating stability, and high incidence of traffic accident. A nonlinear dynamic model for longitudinal, lateral, and yaw motions was developed. The model considers nonlinearity through a modified Dugoff's tire friction model, and is seven-degree-of-freedom. A new nonlinear tethered tractor-trailer combination model was created to simulate critical parameters which would cause unstable state. Then, a trailer front-wheel steering feedback control strategy was derived with the goal of improving stability and trajectory tracking feature of the tractor-trailer system. The …

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Study On Effect Of Neglecting Transient Terms Of Momentum Equations On Simulation Models Of Single Phase Heated Tubes, Yingwei Kang, Yanan Wang, Daogang Peng, Pengyuan Zheng, Yang Ping Jun 2020

Study On Effect Of Neglecting Transient Terms Of Momentum Equations On Simulation Models Of Single Phase Heated Tubes, Yingwei Kang, Yanan Wang, Daogang Peng, Pengyuan Zheng, Yang Ping

Journal of System Simulation

Abstract: A model of single phase heated tubes was presented, based on which the effect of neglecting transient terms of momentum equations on model performance was investigated by simulating a heated tube of the superheater of a power plant boiler. It is found that neglecting the transient terms of momentum equations can significantly decrease the dynamic accuracy of the model; under various step disturbances, neglecting the transient terms of momentum equations can speed up the dynamic response of the enthalpy-temperature channel of the model nearly 4 times; under the step disturbance of the inlet steam flux, neglecting the transient terms …

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Surrogate Model Based Processor Architectural Design Space Exploration Algorithm, Hongwei Wang, Ziyuan Zhu, Jinglin Shi, Yongtao Su, Hongmei Shi, Zhiguo Liu Jun 2020

Surrogate Model Based Processor Architectural Design Space Exploration Algorithm, Hongwei Wang, Ziyuan Zhu, Jinglin Shi, Yongtao Su, Hongmei Shi, Zhiguo Liu

Journal of System Simulation

Abstract: A novel surrogate model based penalty-distance multi-objective expected improvement (PDMOEI) algorithm was proposed for processor architectural design space exploration (DSE): first using a Kriging interpolation technique to construct a surrogate model, then adopting the surrogate model based PDMOEI algorithm to search the Pareto points and finding the globally multi-objective optimized architectural parameter configurations. The proposed algorithm was compared with the multi-objective expected improvement (MOEI) algorithm, the non-dominated sorting genetic algorithm II (NSGA-II) algorithm and the metamodel-assisted NSGA-II (MA-NSGA-II) algorithm by performing two experiments. Experimental results show that, the proposed algorithm achieves better Pareto points pursuing performance than …

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Research On Semi-Active Control Strategy Of High Speed Railway Pantograph-Catenary System Based On Model Predictive Control, Zhiling Ren, Lin Dong, Wang Yue, Guangquan Zhang Jun 2020

Research On Semi-Active Control Strategy Of High Speed Railway Pantograph-Catenary System Based On Model Predictive Control, Zhiling Ren, Lin Dong, Wang Yue, Guangquan Zhang

Journal of System Simulation

Abstract: For the pantograph catenary coupling problem, the semi-active control strategy of pantograph catenary system was proposed. According to the established pantograph catenary model and the contact force history data, it used the MPC prediction technique to predict the next moment of contact force. The predicted value and the theoretical value error were calculated, and the MPC controller output the calculated results to the ER damper. The change of the control input of the contact force was provided by the current damper, which made the actual value close to the theoretical value. Experimental results show that the semi-active …

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Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang Jun 2020

Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang

Journal of System Simulation

Abstract: Because of the influence of node's own state and other factors, the node in mobile P2P network often shows the selfishness and resource preference, which greatly affects the resource search efficiency of the network system. Aiming at this problem, a novel resource search mechanism was proposed based cooperation degree of nodes in selfish mobile Peer-to-Peer network. In the search mechanism, through the comprehensive evaluation of the node's information forwarding rate, the overall similarity and the core degree, the node with the highest degree of cooperation was selected as the relay node for information forwarding. At the same time, through …

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Analysis Of Static Equilibrium Workspace For Under-Constrainted Cable-Driven System With Multi-Robots, Zhigang Zhao, Li Wei, Youde Li, Yanlin Wang, Ma Yan Jun 2020

Analysis Of Static Equilibrium Workspace For Under-Constrainted Cable-Driven System With Multi-Robots, Zhigang Zhao, Li Wei, Youde Li, Yanlin Wang, Ma Yan

Journal of System Simulation

Abstract: For the under-constrainted system that multi-robots tow the payload by cables, which does not meet the condition of force closure and equations are generally not compatible, so the accurate workspace can't be found out. The static equilibrium equation of the system was established, and then the least squares principle combined with the Monte-Carlo method was put forward. When the movement is low speed or quasi static for the payload, the approximate static equilibrium workspace can be found out quickly and the expression of the cable tension is given by using the normal equations and QR decomposition respectively. When position …

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Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You Jun 2020

Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You

Journal of System Simulation

Abstract: A modeling approach for predictive maintenance (PdM) scheduling model based on decision variable conversion was proposed. Based on the proposed approach, a PdM scheduling model could be established by replacing the time decision variable in the corresponding classical time-based preventive maintenance (PM) scheduling model with product condition variable(s) and checking the correlation of the model parameters, maintenance effect and maintenance constraints with product condition. Based on the proposed modeling approach, the application case study considered an unreported predictive maintenance model in which system benefit was correlated with its condition. The proposed approach used the existing PM scheduling …

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Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang Jun 2020

Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang

Journal of System Simulation

Abstract: Influenced by a variety of complicated factors, the network security situation has many characteristics, such as highly nonlinear, time-varying, and mutant. It is difficult to predict accurately with a single prediction method. In response to this shortage, a new combined prediction model for network security situation was proposed based on cooperation policy theory. The network security situation was predicted respectively by using the Elman neural network model, GM(1,1)model, support vector machine (SVM) mode. The Shapley value method of cooperative games was applied to determine the weight of each single prediction model, and the prediction results were weighted calculated to …

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Modeling And Simulation Of Hvdc Systems By Three-Phase Dynamic Phasor, Yunhao Zhao, Chongru Liu, Gengyin Li, Feilong Yun Jun 2020

Modeling And Simulation Of Hvdc Systems By Three-Phase Dynamic Phasor, Yunhao Zhao, Chongru Liu, Gengyin Li, Feilong Yun

Journal of System Simulation

Abstract: A three-phase dynamic phasor (TPDP) model of High Voltage Direct Current (HVDC) systems was proposed. The proposed model could rapidly solve the dynamic characteristics of HVDC systems for AC system symmetrical and asymmetrical operating conditions. Switch functions model of converter was enhanced according to commutation process analysis of the converter. Due to the frequency characteristics analysis results, the TPDP model of HVDC systems with the converter, DC line and controller were established through dynamic phasor theory. Simulation results show that the proposed model is effective and acceptable..

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Forestry Fire Spatial Diffusion Model Based On Integration Of Multi-Agent Algorithm With Cellular Automata, Zhao Di, Zhisheng Xu Jun 2020

Forestry Fire Spatial Diffusion Model Based On Integration Of Multi-Agent Algorithm With Cellular Automata, Zhao Di, Zhisheng Xu

Journal of System Simulation

Abstract: In view of the existing ultrasonic detection signal attenuation, directional difference, complex propagation paths, and characteristics of the components of complex, a kind of intelligent concrete defect nondestructive detection algorithm based on multi resolution singular entropy was put forward. By using the wavelet algorithm, the ultrasonic signal was decomposed into high, low frequency components of multi scales for each component, then each component was decomposed by singular spectrum analysis, at the same time using the information entropy theory, the calculation of singular entropy as the characteristic defect detection value, using the GA-SVM algorithm was used to train the singular …

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Research On Simulation Of Emergency Evacuation Guidance Under Biochemical Terror Attacks, Sui Jie, Shengjie Long Jun 2020

Research On Simulation Of Emergency Evacuation Guidance Under Biochemical Terror Attacks, Sui Jie, Shengjie Long

Journal of System Simulation

Abstract: Biochemical terror attacks can cause numerous casualties, especially when it happens in public places such as subway station, which is densely populated, sealed, and complex in topography. And evacuating guidance plays an important role in reducing casualties. A guidance scheme was established based on both evacuating empirical formula and passengers escaping rules, according to evacuation problems in subway station. Meanwhile, the different features of passengers and their behaviors under attack were analyzed, as well as their impacts on evacuation. By simulating various evacuation situations based on social force simulation model, the importance of environmental features and passengers features in …

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Analysis And Design Of Lfc System With Governor Dead-Band Via Generalized Active Disturbance Rejection Control, Shuaibing Chang, Tan Wen, Zhiyong Zeng Jun 2020

Analysis And Design Of Lfc System With Governor Dead-Band Via Generalized Active Disturbance Rejection Control, Shuaibing Chang, Tan Wen, Zhiyong Zeng

Journal of System Simulation

Abstract: To eliminate the effect of the governor dead-band nonlinearities and guarantee the system stability, for load frequency control (LFC) of power systems with governor dead-band nonlinearity, the active disturbance rejection control (ADRC) was adopted, and the effectiveness of the control method was verified through the describing function method. A linearized method of dead-band was proposed, and the generalized active disturbance rejection control (GADRC) was adopted. Further, an error compensation scheme was proposed to eliminate the dead-band nonlinearities effectively. Simulation results show that the proposed error compensation scheme can eliminate the dead-band nonlinearity effectively and guarantee the control performance of …

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System Modeling And Simulation For Cylinder Controlled By Servo Valve Of Hydraulic Looper In Hot Strip Mills, Guilin Tao, Weigang Li Jun 2020

System Modeling And Simulation For Cylinder Controlled By Servo Valve Of Hydraulic Looper In Hot Strip Mills, Guilin Tao, Weigang Li

Journal of System Simulation

Abstract: Starting from the flow characteristics of cylinder controlled by servo valve of hydraulic looper in hot strip mills, a new mathematic model for hydraulic cylinder controlled by servo valve was established by analyzing and deducing the flow characteristics of two chambers of hydraulic cylinder. The model is different from the traditional equivalent model of “load-pressure flux”, and it is adaptable to many structural forms such as symmetric cylinder, asymmetric cylinder and piston cylinder. The simplified equivalent model was deduced by the simplified method of automatic control principles. The simulation experiments were carried out on a practical cylinder controlled …

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Trajectory Optimization And Tracking Controller Based On Gauss Pseudo Spectral Method For Hypersonic Vehicle, Tao Chao Jun 2020

Trajectory Optimization And Tracking Controller Based On Gauss Pseudo Spectral Method For Hypersonic Vehicle, Tao Chao

Journal of System Simulation

Abstract: For a complex nonlinear mass dynamic model in the ascent stage for a hypersonic vehicle with multiple constrains including state constrains, control constrains, boundary constrains and path constrains, a trajectory optimization methodology based on Gauss Pseudo Spectral was proposed for the hypersonic vehicle. The optimal controller of the trajectory optimization results was chosen as the reference command. For the rigid body dynamics of the hypersonic vehicle, a nonlinear dynamic inverse control combined with PD control methodology was proposed to track the reference command. The simulation results demonstrate that, for the minimum fuel consuming trajectory optimization of the ascent …

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Model For Multi-Area Interaction Control Based On User Strategy, Gong Bi, Bin Yu Jun 2020

Model For Multi-Area Interaction Control Based On User Strategy, Gong Bi, Bin Yu

Journal of System Simulation

Abstract: To solve the problem of multi-area interaction, a model based on user strategy was established. The structure of model was proposed according to security area and user strategy, and transfer path and relevant concept were put forward. The model was instantiated based on portable storage device, the multi-area interaction scene was set up, and the interaction controller structure was designed. Experiments were set up to simulate the host read/write memory process. By judging the host's read/write jurisdiction to memory partition and whether the transfer path can be arrived, the experimental results show that the model can realize interaction control …

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Coordinated Simulation Of Emg Prosthetic Hand Based On Matlab And Adams, You Bo, Shoutong Tao, Huang Ling, Bojun Li, Hanqing Zhao Jun 2020

Coordinated Simulation Of Emg Prosthetic Hand Based On Matlab And Adams, You Bo, Shoutong Tao, Huang Ling, Bojun Li, Hanqing Zhao

Journal of System Simulation

Abstract: In order to reduce the costs and expense during prosthetic hand research process, a simulation system of prosthetic hand was built by using the virtual technology. Building the multi-DOF prototype model of prosthetic hand with virtual modeling software Pro/E, the model was imported into software ADAMS to verifying the feasibility of prosthetic hand kinematic simulation. Through the interface modular part (ADAMS /control) of MATLAB and ADAMS, using Simulink module of MATLAB software built the prosthetic hand model control system of EMG (electromyography), changing the model information of the corresponding hand movements into actual expected angel of prosthetic hand joints. …

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Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times, Tao Li, Luo Liang, Zili Zhang, Lai Hong, Fuyuan Xiao Jun 2020

Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times, Tao Li, Luo Liang, Zili Zhang, Lai Hong, Fuyuan Xiao

Journal of System Simulation

Abstract: In order to characterize the self-organized tempo-spatial patterns of wait times in a healthcare service system, a multi-agent cardiac surgery service model (MA-CSS model) was proposed based on the multi-agent modeling within the context of cardiac surgery services. This model pays a special attention to how patients' and hospitals' behaviors and interactions affect the dynamics and relevant patterns of wait times with respect to some key factors, such as geographic accessibility to services, hospital resourcefulness, and wait times. By experimenting with the MA-CSS model, it was observed that certain regularities in wait times emerged from the simulation, which were …

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Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection, Zhangting Zhong, Yuan Fei, Jiale Wang, En Cheng Jun 2020

Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection, Zhangting Zhong, Yuan Fei, Jiale Wang, En Cheng

Journal of System Simulation

Abstract: To find an efficient and convenient method to determine whether a dredging is illegal is a very meaningful research content. A method of detection of throwing sand behavior based on Chirp signal was studied and three implementation schemes (subsection FFT fast correlation), FRFT and DeChirp were designed. The feasibility of the three schemes was verified by Wu Yuan Bay experiment and the simulation results. Anti-multipath and anti-noise performance of FRFT transform is the best. The performance of dechirp is the worst. Through the analysis, it comes out the conclusion: when the multipath effect is serious, FRFT algorithm …

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