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Articles 2101 - 2130 of 4159

Full-Text Articles in Systems Science

Simulative Analysis Of Capacity Of Transmission Data For Drilling Fluid Based On Cfd, Hongyuan Zheng, Bai Rui, Shuijing Lü, Ce Liu Aug 2020

Simulative Analysis Of Capacity Of Transmission Data For Drilling Fluid Based On Cfd, Hongyuan Zheng, Bai Rui, Shuijing Lü, Ce Liu

Journal of System Simulation

Abstract: Drilling fluid is a typical information transmission medium in the field of oil industry. But for a long time, the lack of relevant research on the data carrying capacity of its data results in difficult to develop high performance mud pulse generator. The CFD simulation technology as a tool; to the actual oil down-hole working environment as the background, and to the depth of the parameters for variables, water-based drilling fluid data transmission capacity were systematically researched. The corresponding relationship between the mud pressure wave transport rate and the depth of the mud at 1000~6000 m depth was obtained, …

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Study On Goaf Treatment And Settlement Simulation Of Existing Overlying Highway Subgrade, Tiejun Cui, Yundong Ma, Laigui Wang Aug 2020

Study On Goaf Treatment And Settlement Simulation Of Existing Overlying Highway Subgrade, Tiejun Cui, Yundong Ma, Laigui Wang

Journal of System Simulation

Abstract: To avoid that mining impacts on the settlement of above highway roadbed, goaf treatment schemes were put forward, such as roof blasting, filling mining and filling mining+roof blasting. According to the rules it is set that the subgrade settlement limit is 0.3 m, and filling rate is 0.85, 0.9 and 0.95. PFC3D explosion model to simulate the blasting was introduced, 7 schemes were put forward for simulating methods of filling body, and the 7 schemes were implemented. The simulation results show that the igneous rock 4 in rock migration process has the function of inhibitting the movement of the …

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Structure Optimum Of Packer Slips Based On Test And Numerical Simulation, Xiaohua Zhu, Shengqi Chao, Zulin Liu, Chen Bo, Haibing Tang, Kaifeng Liang Aug 2020

Structure Optimum Of Packer Slips Based On Test And Numerical Simulation, Xiaohua Zhu, Shengqi Chao, Zulin Liu, Chen Bo, Haibing Tang, Kaifeng Liang

Journal of System Simulation

Abstract: The permanent packer is an essential tool for segment fracturing during shale gas exploitation. The structure of the slips directly affects its setting ability. For Y440 type packer, setting and sealing tests were carried out, and the results show that the packer exists slip during sealing operation, which may exacerbates slip and even slip off under the condition of shock and vibration in a wellbore. Finite element models were established based on nonlinear explicit dynamic analysis method. According to the comprehensive evaluation on the stress value, plastic deformation and the slippage of slips with the different tooth …

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Simulation Approach To Temperature Measuring Using Image Color Based On Support Vector Regression, Ren Yan, Xiaomin Zhou, Guan Wei, Fu Li, Xinyu Chen Aug 2020

Simulation Approach To Temperature Measuring Using Image Color Based On Support Vector Regression, Ren Yan, Xiaomin Zhou, Guan Wei, Fu Li, Xinyu Chen

Journal of System Simulation

Abstract: As it is all known, it is difficult to measure high temperature directly in complex industrial environment. Thus, a new temperature soft-measuring method based on Support Vector Regression (SVR) was proposed. SVR model was used to fit the complex nonlinear mapping relationship between the feature values of color images of the high temperature object and its temperature. And then the trained model could predict the temperature by inputting the features of colorimages. Simulation results demonstrate that the improved algorithm has excellent generalization ability and predictive ability. What’s more, this model needs less support vectors and learns faster.

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On Linear Mmse Based Turbo-Equalization Of Nonlinear Volterra Channels, Yecai Guo, Weiwei Ma, Zhang Shan, Ruizhi Zhou Aug 2020

On Linear Mmse Based Turbo-Equalization Of Nonlinear Volterra Channels, Yecai Guo, Weiwei Ma, Zhang Shan, Ruizhi Zhou

Journal of System Simulation

Abstract: Nonlinear intersymbol interference is one of the important factors affecting the satellite channel, and it is very necessary to eliminate and reduce the effect. On the basis of using the Volterra series decomposition to denote the nonlinear channel, linear Minimum Mean Square Error (MMSE) based Volterra channel turbo equalization algorithm was proposed. In this proposed algorithm, after the linear MMSE equalizer and its two approximation algorithms were derived, the proposed linear MMSE based Volterra channel turbo equalization exact and approximate algorithms could not only eliminate the linear and nonlinear intersymbol interference but also reduce the computation complexity. Simulation results …

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Failure Risk Identification Model And Simulation Of Supply Chain Under O2o E-Commerce Model, Zhang Hao, Mingkun Wang Aug 2020

Failure Risk Identification Model And Simulation Of Supply Chain Under O2o E-Commerce Model, Zhang Hao, Mingkun Wang

Journal of System Simulation

Abstract: With the expansion of Online to Offline (O2O) e-commerce market size, how to effectively prevent the occurrence of supply chain failure risk becomes the key factor to ensure O2O e-commerce market to operate well. The key influencing factors of the supply chain failure risk were analyzed and sorted. Based on causal relationship between various influencing factors, Bayesian network was constructed to analyze crucial factors. The application of triangle fuzzy number was introduced to gather value of conditional probability of Bayesian network. A case study on the failure risk identification model of fresh agricultural product supply chain under O2O model …

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Optimal Real-Time Pricing Model Of Smart Grid Based On Markov Decision Process, Jiangbo Li, Wang Bo, Gao Yan, Huizhen Zhang Aug 2020

Optimal Real-Time Pricing Model Of Smart Grid Based On Markov Decision Process, Jiangbo Li, Wang Bo, Gao Yan, Huizhen Zhang

Journal of System Simulation

Abstract: Real-time electricity price strategy is the effective means to save electricity and improve user electricity utility value. A real-time electricity price optimization model based on Markov Decision Process was raised. Using finite horizon method, the model structure the mathematical model which makes the expected utility maximum of supply side and demand side, and optimize the existing electricity utility function according to decreasing risk theory which using logarithmic form can describe the power utility of user more accurate. Particle Swarm Optimization was used to solve this model and make the results compare with the situation of fixed power price, the …

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Adaptive Dynamic Programming In Raw Meal Fineness Control Of Vertical Mill Grinding Process Based On Extreme Learning Machine, Xiaofeng Lin, Weikai Kong Aug 2020

Adaptive Dynamic Programming In Raw Meal Fineness Control Of Vertical Mill Grinding Process Based On Extreme Learning Machine, Xiaofeng Lin, Weikai Kong

Journal of System Simulation

Abstract: The grinding process of vertical mill raw meal in cement industry features nonlinear, strong coupling and long time-delay, which is difficult to model precisely and implement stable control for raw meal fineness. Against the problem, a production index prediction model of vertical mill raw meal grinding process was established using Extreme Learning Machine (ELM). Adaptive dynamic programming (ADP) was used to control the raw meal fineness, whose action and critic networks were implemented by online sequential extreme learning machine. In the meaning of simulation, the results show that the proposed method is valid and helpful to reduce the …

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Research On Control Strategy Of Switched Reluctance Motor Drive System For Mine Electric Locomotive, Xiaoping Zhang, Yanhong Zhou, Zhang Zhu Aug 2020

Research On Control Strategy Of Switched Reluctance Motor Drive System For Mine Electric Locomotive, Xiaoping Zhang, Yanhong Zhou, Zhang Zhu

Journal of System Simulation

Abstract: Due to simple structure features, low cost, small starting current, large starting torque, and reliability, Switched Reluctance Motor (SRM) are very suitable for application in the mine electric locomotive electric transmission system. The basic structure and working principle of SRM were introduced, considering the working characteristics of mine electric locomotive, direct torque control strategy based on adaptive fuzzy PI control was proposed. Design method of the strategy was elaborated, after which simulation verification of control effect and comparison analysis with traditional methods were conducted. Simulation results show that, the control strategy effectively solves the problem of large torque ripple …

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Finite Element Simulation Of Ultrasonic Guided Wave To Detect Through-Type Defects In Pipe, Hongwei Hu, Zexiang Wang, Guangkai Sun, Peng Gang Aug 2020

Finite Element Simulation Of Ultrasonic Guided Wave To Detect Through-Type Defects In Pipe, Hongwei Hu, Zexiang Wang, Guangkai Sun, Peng Gang

Journal of System Simulation

Abstract: To get the relationship between the defects and ultrasonic guided wave, the dispersion characteristic of guided wave in pipe was studied. Then the finite element model of a pipe with a through-type defect was established. Taking the axial and circumferential defects with different sizes as research objects, the relationship between the defect location and defect size with the ultrasonic guided wave reflection coefficients was studied, using a control variable method, by finite element simulation. The results show that there is a linear relationship between the circumferential sizes of the defect and the reflection coefficients for through-type defects …

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Nacelle Wind Speed Correction Of Wind Turbine Generation Units Based On Wind Speed Measured By Anemometer Tower, Gao Feng, Xiyun Yang, Wang Wei, Zhang Lei Aug 2020

Nacelle Wind Speed Correction Of Wind Turbine Generation Units Based On Wind Speed Measured By Anemometer Tower, Gao Feng, Xiyun Yang, Wang Wei, Zhang Lei

Journal of System Simulation

Abstract: In consideration that there are great calculation errors in theoretical correction of nacelle wind speed, the entire range of wind speed was divided according to changes of control strategies for wind turbine generation unit. The nacelle transfer function (NTF) was defined by higher-order polynomial fitting to identify a method for correcting nacelle wind speed based on wind measurements of the anemometer tower. It doesn’t only overcome problems like poor practicability of IEC standards NTF, but also has higher fitting precision than simple linear fitting without intervals. By introducing intermediate intervals, the problem about discontinuous NTF in different sections …

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Measuring Principle Research On Fundamental Wave Of Grid Based On Curve Fitting Model, Liyun Liu, Zhezhao Zeng Aug 2020

Measuring Principle Research On Fundamental Wave Of Grid Based On Curve Fitting Model, Liyun Liu, Zhezhao Zeng

Journal of System Simulation

Abstract: Measuring principle of grid fundamental wave based on algebraic polynomial model is proposed. Its main idea is to optimize parameters of algebraic polynomial model so as to accurately fit the power grid fundamental wave signal to be measured based on the recursive least squares (RLS), and then the steepest descent method was adopted to iteratively calculate zeros of the fitting polynomial model, and then fundamental frequency was obtained according to time difference of the adjacent two zeros. Fundamental wave amplitude could be obtained according to the fitting model values corresponding to the middle of the adjacent two zero points. …

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Study On Track And Detect Algorithm In Radar Networking Based On Gmphd, Wenbo Zhao, Hailong Ding Aug 2020

Study On Track And Detect Algorithm In Radar Networking Based On Gmphd, Wenbo Zhao, Hailong Ding

Journal of System Simulation

Abstract: The states and number of WSNR multi-target are tracked accurately by Gaussian mixture probability hypothesis density algorithm (GMPHDA) application. But tracking result is random set of target states, it doesn't correspond one to one with real targets. And the complete algorithm about corresponding has not been proposed. To get target tracks corresponding with real targets, a suite of algorithm about identifying target tracks is proposed, called track identification algorithm, which contains track distinction, continuance, newborn and restoration. The track identification algorithm improves track and detect algorithm in multi-radar networking. Simulation results show that WSNR multi-target is tracked in multi-radar …

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Neural Network Inverse Control For The Output Voltage Of Energy Storage Inverter In Micro-Grid, Weiliang Liu, Yongjun Lin, Changliang Liu, Wenying Chen, Liangyu Ma Aug 2020

Neural Network Inverse Control For The Output Voltage Of Energy Storage Inverter In Micro-Grid, Weiliang Liu, Yongjun Lin, Changliang Liu, Wenying Chen, Liangyu Ma

Journal of System Simulation

Abstract: In order to improve the output voltage waveform quality of energy storage inverter in micro-grid, an inverse control method was proposed based on BP neural network. Mathematical model of the energy storage inverter was established, and the main factors affecting the output voltage were analyzed, and then the expansion inverse model of the system was established based on BP neural network. In order to overcome the local optimum disadvantage in BP training algorithm, gravity algorithm was adopted to optimize the network initial parameters. The neural network inverse model was put in series with its original model to form a …

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Application Of Improved Particle Filter And Wavelet Packet In Turbine Vibration Diagnosis, Xia Fei, Shuotao Hao, Zhang Hao, Daogang Peng Aug 2020

Application Of Improved Particle Filter And Wavelet Packet In Turbine Vibration Diagnosis, Xia Fei, Shuotao Hao, Zhang Hao, Daogang Peng

Journal of System Simulation

Abstract: A fault diagnosis method of improved particle filter and wavelet packet analysis was proposed in the application of turbine vibration. There was a sample degradation problem in the re-sampling stage of traditional particle filter. And a re-sampling algorithm which was a weight sorting and the survival of the fittest to obtain the improved particle filter was studied. The signal was filtered by the improved particle filter. Then wavelet packet analysis was used to extract the features from the noise reduction signal. Finally the fault diagnosis results were obtained by using SVM. It is shown that the fault identification rate …

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Multimedia Annotation Refinement Based On Contextual Information Diffusion, Tian Feng, Fuhua Shang Aug 2020

Multimedia Annotation Refinement Based On Contextual Information Diffusion, Tian Feng, Fuhua Shang

Journal of System Simulation

Abstract: A data driven multimedia annotation refinement method based on dataset contextual information diffusion was proposed. The label contextual graph was constructed, and the label correlation can be diffused on textual label space; Multimedia object content relevant graph was constructed. Label contextual graph and multimedia object content relevant graph were mutually reinforced and formulated into a regularized framework. The proposed method incorporated both multimedia content correlation and label contextual information, and the optimization process was solved by approximate solution algorithm. The experimental results on real world dataset show that the proposed method can obviously improve the annotation performance.

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Friend Recommendation Based On Analysis Of Users’ Emotions And Text Semantics, Qun Liu, Hongtao Sun, Lianghao Ji Aug 2020

Friend Recommendation Based On Analysis Of Users’ Emotions And Text Semantics, Qun Liu, Hongtao Sun, Lianghao Ji

Journal of System Simulation

Abstract: The interests and emotions of users are often varied in their real lives. On the contrary, some other features (such as the profiles) of micro-blog are always unchangeable and they cannot describe the users’ characteristics very well. Then a novel friend recommendation method merged users’ text semantics with emotions was proposed. In the model, in order to compute the similarity of friends, some text content features from users’ micro-blog are extracted and time factor was introduced. Then further consideration on the users' emotional characteristics was taken to compute the users’ similarity through analyzing the emotional words in micro-blog text. …

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Scalable Semantic Web Services Architecture Design And Service Discovery, Xiaoxing Niu, Zhixue Wang, Minggang Yu Aug 2020

Scalable Semantic Web Services Architecture Design And Service Discovery, Xiaoxing Niu, Zhixue Wang, Minggang Yu

Journal of System Simulation

Abstract: With the rapid development of computer and network technologies, the variety and quantity of Web Services on the network is also increasing. How to find the requiring services quickly and accurately becomes increasingly important. In order to solve the problems with traditional Web Services architecture, such as poor scalability and lacking of semantic information, a scalable semantic Web Services architecture was proposed, the architecture could meet the requirements to construct distributed and large-scale systems based on SOA for modern enterprises. Service publication and deletion algorithms of the architecture were studied, and dynamic adjustment algorithms of the architecture was studied …

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Wechat Information Dissemination Mechanism And Simulation Research Based On Field Theory, Xiaohong Shan, Panpan Jia, Xiaoyan Liu Aug 2020

Wechat Information Dissemination Mechanism And Simulation Research Based On Field Theory, Xiaohong Shan, Panpan Jia, Xiaoyan Liu

Journal of System Simulation

Abstract: As the popular social networking platform, the wechat network has the rapid impact on people's way of life. By analyzing the factors that influence the information dissemination among wechat, constructing the wechat information diffusion field by building three-dimensional coordinate, the information diffusion model was established based on the field theory. The process of information dissemination was simulated from three angles by using Netlogo simulation platform, that is the factors affecting the information dissemination, the original proportion of information source users, and different wechat network structures. Simulation results show that the more similar characteristics of the user, the dissemination results …

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Broadband Beamforming Method For Circular Sensor Array, Gan Tian Aug 2020

Broadband Beamforming Method For Circular Sensor Array, Gan Tian

Journal of System Simulation

Abstract: The beamforming method based on mode decomposition is a kind of very good beamforming method for circular sensor arrays, in order to apply it to the broadband beamforming, An against white noise robust beamforming method was proposed to design an expect beam. The method designed the modal domain robust modal coefficient using the model decomposition method to generate different beam under the different mode circumstances, using second-order cone optimization algorithm gain more reasonable compromise than the other methods in the broadband beam performance, The platform of choice and operation of space were provided according to the demand for …

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Arm-Based Real-Time Video Stabilization Enhancement Algorithm, Xiaoquan Chen, Zhang Lei, Huang Hua Aug 2020

Arm-Based Real-Time Video Stabilization Enhancement Algorithm, Xiaoquan Chen, Zhang Lei, Huang Hua

Journal of System Simulation

Abstract: Considering the performance characteristic of ARM processor, an ARM-based real-time video stabilization enhancement algorithm was proposed that identified shakiness of video and implements motion smoothing in the space of geometric transformations. The algorithm identified the shakiness of video with the amplitudes’ change of translation and rotation. Then the optimal path could be obtained by linear interpolation on translational vector and rotational angle. Stable frames were generated by implementing motion compensation of translation and rotation transformations respectively. Because the algorithm used linear interpolation in the space of rigid transformations, it was much faster than the previous algorithms. Moreover, it …

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Can Bus Simulation System Based On Opnet, Yantao Liu, Xu Jing, Guiyang Xia, Qin Na Aug 2020

Can Bus Simulation System Based On Opnet, Yantao Liu, Xu Jing, Guiyang Xia, Qin Na

Journal of System Simulation

Abstract: CAN (Controller Area Network) is a typical kind of serial communication protocol. To solve the problem of bus contention, CAN adopts the mechanism of non-destructive bitwise arbitration. In order to realize simulation study on this mechanism, simulation models of Medium Access Control (MAC), process models, node models and network model of CAN were built. End-to-End delay of the simulation network was obtained by simulating these models under the condition of whether there existed a bus contention. The correctness of these models was proved by extensive simulation experiments and rigorous analyses. The models can be used in simulation study …

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Online Fragment Culling For Efficient Rendering Of Multi-Fragment Effects, Zhou Guo, Dengming Zhu, Zhaoqi Wang, Wei Yi Aug 2020

Online Fragment Culling For Efficient Rendering Of Multi-Fragment Effects, Zhou Guo, Dengming Zhu, Zhaoqi Wang, Wei Yi

Journal of System Simulation

Abstract: Multi-fragment effects such as real-time transparency are rendered by visiting the per-pixel fragments in depth order. The k-buffer algorithm rendered the scene in a single pass to obtain several layers of fragments. The read-modify-write hazard while updating the buffer should be avoided thus the performance was likely to be hit hard. The temporal and spatial coherence among frames were exploited to cull the input fragments in an online manner. A fragment cache based on a semi-heap was proposed. The worst case scenario of the time complexity was analyzed. The reverse reprojection was employed to construct the culling interface …

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Modeling And Simulation Of Bldcm Fuzzy Control System With Real-Time Modification Function, Yuanwang Deng, Zeng Jun Aug 2020

Modeling And Simulation Of Bldcm Fuzzy Control System With Real-Time Modification Function, Yuanwang Deng, Zeng Jun

Journal of System Simulation

Abstract: Based on the analysis of the mathematical model of brushless direct current motor (BLDCM), a novel method for modeling of BLDCM was proposed. In MATLAB, the model of BLDCM was established by C MEX S-function, and the simulation results showed that the proposed method can enhance the simulation efficiency. Based on the modeling and simulation of BLDCM, a modification function was introduced and a self-turning fuzzy controller was built. According to the error and error rate of speed, the proposed modification function performed real-time regulation of fuzzy rules. There were six regulation parameters …

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Research Of Approximation Algorithm Of Vertex Cover, Wenyu Gao, Li Hua Aug 2020

Research Of Approximation Algorithm Of Vertex Cover, Wenyu Gao, Li Hua

Journal of System Simulation

Abstract: Vertex cover is one of the most important NP complete problems, and it is also one of the most studied problems in parameterized algorithm design in recent years. According to some deficiencies of existing vertex cover approximation algorithms, a novel NT theorem based 2-approximation algorithm was proposed based on advances in parameterized algorithm. The new algorithm first used kernelization technology to reduce the origin graph, then used greedy strategy to guide the vertex selection in the remaining graph, kernelization provided effective guarantee for the approximation algorithm. In order to test the performance of the new algorithm, simulations on different …

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Analysis Of Risks Transmission And Control In Subway Construction, Qingjun Guo, Hongyu Yan, Bosen Li Aug 2020

Analysis Of Risks Transmission And Control In Subway Construction, Qingjun Guo, Hongyu Yan, Bosen Li

Journal of System Simulation

Abstract: The process of the transmission and control of hidden dangers in subway construction is very similar to that of infectious diseases. Based on an engineering example, the characteristics of the complex system in the subway construction site are analyzed, and a simulation method using the propagation dynamics model to describe the interaction and propagation of various elements is proposed. Hazard source and hidden danger data of a section of Qingdao metro line 4 from march to August 2017 are selected as the original state, using by MATLAB R2014a simulation calculation, the densities of different elements are gotten, the process …

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Hardware-In-The-Loop Simulation System For Underwater Vehicle Based On Unity3d, Fushen Ren, Yaqi Sun, Hu Qing, Zhaoliang Li, Pengyu Sun, Yukun Fan Aug 2020

Hardware-In-The-Loop Simulation System For Underwater Vehicle Based On Unity3d, Fushen Ren, Yaqi Sun, Hu Qing, Zhaoliang Li, Pengyu Sun, Yukun Fan

Journal of System Simulation

Abstract: In order to provide a simulation and test platform for the performance test, control algorithm analysis and operation training of underwater robot, a hardware-in-the-loop simulation system based on Unity3D is developed, which consists of a ground control terminal, a robot body and a three-dimensional simulation system. The system uses the same ground control terminal as the unified command input source of the three-dimensional simulation system and robot control system, and realizes the synchronization of the virtual object and robot body, real-time monitoring and parameters adjustment to the system. The position of the robot is collected by multiocular vision technology, …

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Robust Heading Control Of An Unmanned Surface Vehicle Based On Lpv Model, Junfeng Xiong, Yuqing He, Jianda Han, Mingzhe Yuan Aug 2020

Robust Heading Control Of An Unmanned Surface Vehicle Based On Lpv Model, Junfeng Xiong, Yuqing He, Jianda Han, Mingzhe Yuan

Journal of System Simulation

Abstract: Aiming at the strong nonlinearities of hydrodynamics, and the influences of wind, wave and current on USVs (Unmanned Surface Vehicles), an H∞ robust yaw keeping controller based on LPV (Linear Parameter Varying) model is proposed. The LPV model uses the Froude number as the varying parameter, reflects the USV’s nonlinear hydrodynamics along with the Froude number, and simplifies the parameters identification and controller design. By using the Froude number as the scheduled parameter, an H∞ robust yaw keeping controller is designed on the basis of bounded real lemmas to attenuate the disturbances. Simulations on a 3-DOF underactuated …

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Global Optimized Photovoltaic Mppt Algorithm Based On Pso And Incremental Conductance Method, Yunjun Yu, Liu Tao, Shisheng Wang, Jianbo Xin, Xiaohua Nie Aug 2020

Global Optimized Photovoltaic Mppt Algorithm Based On Pso And Incremental Conductance Method, Yunjun Yu, Liu Tao, Shisheng Wang, Jianbo Xin, Xiaohua Nie

Journal of System Simulation

Abstract: The P-V array characteristic curve exhibits a plurality of local maximum power point under conditions of partial shading. The incremental conductance method maybe track an extreme value point that is not the largest power point, thus lead to tracking failure. The PSO algorithm has the characteristics of global optimization, but its tracking precision is deficient. A global MPPT algorithm based on PSO algorithm by incremental conductance method was proposed, PSO algorithm could quickly locate to the approximate global MPP, INC could further precise the MPP. Compared to the traditional incremental conductance method Simulink simulation and the research when …

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Numerical Simulation Study Of Impact Of Stagger Angle And Radius Ratio On Performance Of Combined Type Vawt, Xiucong Fu, Xiaoting Liang, Baoxing Ou, Chili Wu, Ruheng Zhao, Yuepeng Li, Kaihong Pi, Xiao Shuai Aug 2020

Numerical Simulation Study Of Impact Of Stagger Angle And Radius Ratio On Performance Of Combined Type Vawt, Xiucong Fu, Xiaoting Liang, Baoxing Ou, Chili Wu, Ruheng Zhao, Yuepeng Li, Kaihong Pi, Xiao Shuai

Journal of System Simulation

Abstract: Darrieus-Savonius combined rotor could effectively improve the performance of sole type vertical axis wind turbine. In order to investigate the impacts of radius ratios and stagger angles on the combined rotor, and their best combination, aerodynamic simulations of different radius ratios and stagger angles were studied. The numerical simulation is based on 2D unsteady incompressible air model and realizable k-ε turbulence model. The result indicates that the radius ratio represents the occupied swept area of Savonius rotor, the larger radius ratio, the higher proportion of the positive momentum outputs (M≥0) in a rotation period. In addition, …

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