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Articles 2851 - 2880 of 6662

Full-Text Articles in Numerical Analysis and Scientific Computing

Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao Aug 2020

Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao

Journal of System Simulation

Abstract: Vector field topology analysis is an important tool of feature-based visualization of vector fields. As a frontier research of flow field visualization, topology analysis extracts the topological structures as vector fields' features, helps uses filter important data, and reduce the occlusion and visual cluster. Based on mathematical definitions related to vector field topology analysis, different methods were introduced along with their advantages and shortcomings, and a knowledge system of vector field topology analysis was well-established. The applications and significance of topology analysis were explored to play a greater role, and the combination with other visualization techniques was discussed …

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Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan Aug 2020

Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan

Journal of System Simulation

Abstract: Given the interference from noise, poor quality and low identification of the night images, it is difficult to segment them by traditional color image segmentation method. Therefore, a novel dark color image segmentation method integrated MRF&Retinex was proposed. The -LPG-PCA filtering model was built to filter out noise of an image. The recovery function of the denoised image was constructed, before converting RGB color space to HSV color space, and the MRF & Retinex model was built for image enhancement and color correction operation. The denoised and enhanced color image was segmented by the MRF&FCM …

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Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang Aug 2020

Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang

Journal of System Simulation

Abstract: In order to improve the fidelity of dynamic aggregation process of virtual pedestrian, the relationship between gathering process and emotion contagion were simulated by integrating individual emotional interaction into crowd model. Individuals within the crowd firstly chose moving target and produced aggregation according to their expectation. The gathering process propagated the influences of target through the emotional interaction of individuals. The propagated influences affected individuals' expectation which made further efforts on crowd aggregation. Social force for simulating moving individuals and heat conduction theory were adopted by the model to simulate the emotional contagion of the crowd. Experimental results show …

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Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang Aug 2020

Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang

Journal of System Simulation

Abstract: More and more researchers have begun to study the human action recognition based on depth information and skeleton information since the Kinect has been released. A method of human action recognition based on the skeleton feature of key frames is proposed in order to improve the accuracy and timeliness of the human action recognition, and reduce the computational complexity. The clustered data was obtained by using K-means clustering algorithm, and then the key frames were extracted by using the clustered data. Two features for human action recognition were extracted, one is the feature of the position of human joint, …

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Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie Aug 2020

Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie

Journal of System Simulation

Abstract: The images sequence captured by UAV has the high resolution and high overlapping characteristics, so it is used in a wide range of scene reconstruction. However, the result of these state-of-art multi-view 3D reconstruction algorithms is unstable when dealing with large-scale UAV thousands of images. In this regard, the UAV low accuracy GPS / IMU parameters sequence was fused to the large-scale UAV image reconstruction process and the UAV sequence batched image reconstruction method was proposed. The image matching time and false matching number was reduced by using low-precision GPS / IMU priori information. Through the establishment of a …

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Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu Aug 2020

Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu

Journal of System Simulation

Abstract: Virtual simulation of fluid phenomena is of great value, and SPH fluid simulation-based method can truly reflect the motion of the fluid. However, as the size of the fluid increasing, the computation becomes large, especially fluid collision detection in complex scenes significantly reduces the efficiency of fluid simulation. By using GPU to accelerate SPH physical calculation and collision detection, and use of new neighbors particles chain table building method for particles searching, can improve fluid simulation efficiency. By using voxel scene rasterization of sampling methods, the calculation of collision detection was speeded up, and the storage space was saved …

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Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu Aug 2020

Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu

Journal of System Simulation

Abstract: Ball Pivoting algorithm is mainly used for surface reconstruction of point cloud data, the algorithm starts from a seed triangle, the ball along the seed triangle a side of rotation until the ball is exposed to a point and the edge and the composition of a triangle. The main disadvantage of this algorithm is that when the point cloud data is not uniform when the ball in the rolling process does not contact the point, and therefore will have a hole. A non-uniform point cloud data for improved reconstruction of the Ball Pivoting algorithm of the original point cloud …

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Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su Aug 2020

Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su

Journal of System Simulation

Abstract: To simulate the ship track in the marine virtual battle environment, a novel algorithm based on the single viewpoint video was proposed to reconstruct the ship stern wave. Gaussian filter was used to preprocess the video image and extract the long tail region from the video image; SFS algorithm was employed to compute the height field of the ship stern wave and generate its grid mesh; The normal of each vertex was computed based on the CUDA technology. The experimental results show that the reconstructed stern wave yields a good sense of reality. At the same time, it …

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Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing Aug 2020

Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing

Journal of System Simulation

Abstract: Skin color region image post-processing methods suitable for gesture recognition system based on computer vision was proposed. To solve the problem of face and hand often occur simultaneously in the image frame, the training process and grouping strategy of AdaBoost face detector based on Haar-like template were studied, and a rapid culling method of face region based on fusion of color information was proposed. To reduce the influence of noise in skin color region image, impulse noise suppression and skin-like region rejection was proposed. The test results have shown that the proposed methods can greatly speed up the face …

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Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin Aug 2020

Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin

Journal of System Simulation

Abstract: Traditional method based on color image can recover the boundary of an object, but it can't recover the concave part. Although reconstruction based on depth image can revert the concave part, but the result has bad boundary which means that the edge information lost seriously. The method that fused the depth and RGB image was proposed to solve the individual shortcomings. Based on space subdivision the origin visual hull was computed based RGB image and depth image individually. In the following step, the two type visual hulls were combined for analyzing concave area and then fused into one. A …

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Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long Aug 2020

Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long

Journal of System Simulation

Abstract: With the development of computer graphics, the demand of the 3D model based on the Internet is growing; the related 3D models repository platform and service have emerged. The prototype system of 3D lightweight models repository, at the same time, it introduced the related cloud platform architecture and the framework of system platform was proposed and realized, moreover, the realized process of the system and some related key technologies were introduced, including lightweight JSON conversion algorithm, dynamic transaction management mechanism, adapter-based dynamic model loading mechanism, lightweight progressive meshes algorithm, sketch-based retrieval Using Content-Aware Hashing. …

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Constructing Panoramic High Dynamic Range Image Based On Different Amounts Of Exposures, Quan Wei, Wang Ying, Yanchun Wang, Xuyang Wang, Yunrui Zhu Aug 2020

Constructing Panoramic High Dynamic Range Image Based On Different Amounts Of Exposures, Quan Wei, Wang Ying, Yanchun Wang, Xuyang Wang, Yunrui Zhu

Journal of System Simulation

Abstract: A method of constructing panoramic high dynamic range image was proposed. The classical method about different amounts of exposures was adopted by choosing sampling point carefully to generate better response curves for each child camera of the panoramic camera. Weighted method was applied to obtain panoramic response curve based on six response curves of each child camera. According to characteristics of spatial frequency, a template of panoramic image was selected, so as to complete the synthesis of high dynamic panoramic image. Experiments show that the response curve of panoramic camera can better reflect the characteristics, so the …

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Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou Aug 2020

Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou

Journal of System Simulation

Abstract: To visualize the status data of the procedure in real time, a visualization method supporting by the relating static model was proposed. The static models were built in the method. The processing status data were divided into some data segment matching to the static model. The dynamic model for each data segment was built based on the shape of the corresponding static model. Each part of the model was colorized or texturized based on its type or value. All the dynamic model and static model were linked and assembled due to its logical relation. The final visualization result …

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Three-Dimensional Virtual Simulation Of Overflow Dam, Guisheng Fang, Hongfa Wang Aug 2020

Three-Dimensional Virtual Simulation Of Overflow Dam, Guisheng Fang, Hongfa Wang

Journal of System Simulation

Abstract: Overflow dam is one of hydraulic structures widely used in the water conservancy projects. The surface structure of overflow dam and the open mode of sluice gate have huge influence to the flood flow. The Navier-Stokes equation was used as the turbulence control equation. The Smoothed Particle Hydrodynamics method was used to simulate the 3D flood flow. The shape of water flow and the distribution of pressure and the distribution of flow velocity were respectively analyzed in the case of different gate opening state. The experimental results show that the virtual simulation of overflow dam is the same as …

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3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang Aug 2020

3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang

Journal of System Simulation

Abstract: Currently, retrieve 3d models use hand-drawn sketch as query has become an active research field. In the Bag of Feature (BoF) framework, the granularity of the distinction and expression brought by the "hard clustering" is insufficient. To solve this problem, a new method was proposed: GALIF feature was extracted from each sketch and the set of view images of models. BOF was replaced by a feature coding based on “soft clustering”--Gaussian mixture model. A fast and effective manifold ranking algorithm was used to calculate the manifold similarity between images, giving the final retrieve results. The previous methods …

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Title Medical Image Fusion Based On Multi-Scale Coefficient Decomposition Framework, Kaifeng Wen, Bingjian Li Aug 2020

Title Medical Image Fusion Based On Multi-Scale Coefficient Decomposition Framework, Kaifeng Wen, Bingjian Li

Journal of System Simulation

Abstract: The main purpose of medical image fusion is to obtain a high resolution image with as much details as possible for diagnosis. Magnetic resonance (MR) and computed tomography (CT) medical images has special sophisticated and complementary characteristics which are required for accurate diagnosis of disease. Based on this, a new medical fusion approach for MR and CT images based on multi-scale coefficient decomposition framework was proposed. The proposed approach used a combination of discrete wavelet and non-subsampled shearlet transforms for the initial multi-scale decompositions firstly. The decomposition multi-scale coefficients were fused twice using various local activity measures. The …

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Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao Aug 2020

Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao

Journal of System Simulation

Abstract: In order to realize high-accuracy measurement of nonlinear loads, an improved algorithm of harmonic energy measurement based on discrete wavelet packet decomposition and reconstruction was proposed. Frequency band and the corresponding number of decomposition layer were given according to the sampling number, window width and sampling frequency. To improve the non-ideal cut-off characteristic of wavelet filter and eliminate the frequency aliasing, the discrete Fourier and the inverse transformation were used to remove the extra frequency components. The calculation expression of harmonic power and the principle of harmonic energy measurement were listed. The simulation analysis of harmonic energy measurement …

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Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei Aug 2020

Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei

Journal of System Simulation

Abstract: Considering the negative effects of mesh distortion on calculation accuracy in FEM simulation, a novel mesh free method named Smoothed Particle Hydrodynamics (SPH) method was employed to simulate the process of single CBN abrasive grain cutting TC4. Establishing a SPH model of TC4 workpiece and a FEM model of single abrasive grain with cutting edges similar to the real abrasive grain, the influences of cutting depth on grinding forces and chip formative process were studied systematically. The simulation results state that grinding forces enlarge with the increase of cutting depth, while grinding force ratio decreases. And TC4 chip formative …

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Qwasi: The Quantum Walk Simulator, Warren V. Wilson Aug 2020

Qwasi: The Quantum Walk Simulator, Warren V. Wilson

Theses and Dissertations

As quantum computing continues to evolve, the ability to design and analyze novel quantum algorithms becomes a necessary focus for research. In many instances, the virtues of quantum algorithms only become evident when compared to their classical counterparts, so a study of the former often begins with a consideration of the latter. This is very much the case with quantum walk algorithms, as the success of random walks and their many, varied applications have inspired much interest in quantum correlates. Unfortunately, finding purely algebraic solutions for quantum walks is an elusive endeavor. At best, and when solvable, they require simple …

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Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi Aug 2020

Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi

Journal of System Simulation

Abstract: The limitation of the traditional communication model modeling methods was analyzed. On the basis of detailed analysis the requirements of communication modeling and simulation, the method of communication model modeling method was designed based on the communication effects. It shows how to represent communication asset and combines the input and output of the model with the simulation verification scenario to illustrate the validity and applicability of the communication model. This method can effectively solve the impact analysis of communication problem for operational effectiveness, saves development costs and supplies the reference method of C4ISR model in warfare modeling …

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Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo Aug 2020

Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo

Journal of System Simulation

Abstract: Cooperation is the base of Computer Generated Forces team behaviors; formation and formation changing are the mostly used team cooperation of tank unit CGF. By combining cooperation planning with joint intention, a formation cooperation method for tank unit CGF was promoted. According to the knowledge levels of different CGF roles about the cooperation, the commander role CGF planed conditions and restraints of the formation cooperation, and the subordinated CGF autonomy planed to concretely implement the cooperation, which significantly enhanced the formation cooperation efficiency. The joint intention was established before the implementation of the cooperation, all CGF revised cooperation action …

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Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin Aug 2020

Modeling And Simulation On Railway Bulk Oil Transit Operations, Jingheng Ma, Xingchang Liu, Youhong Fan, Kang Jin

Journal of System Simulation

Abstract: The railway bulk oil transit operation is a hybrid (discrete/continuous) system because of the main body of the continuous flow oil and a variety of discrete events. According to the system’s characteristics of complex process, great difficulty, high risk, the oil transit operation model was established based on discrete rate simulation and system’s continuity, predict events, emergencies were analyzed. The model was converted into linear programming, the effective rate was calculated under constraints, and the operation process and event scheduling was simulated. It was verified that the model is feasible. By obtaining the dynamic behavior and real-time data, its …

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Probability Hypothesis Density Filter Based On Adaptive Target Birth Intensity, Jingjing Wu, Lihua You, Wang Yao, Shujuan Song Aug 2020

Probability Hypothesis Density Filter Based On Adaptive Target Birth Intensity, Jingjing Wu, Lihua You, Wang Yao, Shujuan Song

Journal of System Simulation

Abstract: For probability hypothesis density (PHD) filter, that was not able to track birth targets of unknown position, PHD filter with adaptive target birth intensity was proposed. The track initiation algorithm was employed to detect positions of promising birth targets which were used to form the intensity function of birth targets, and an online estimation algorithm of spontaneous birth intensity was proposed. Adaptive target birth intensity was combined with the recursion of the PHD filter, and a solution to the PHD filter based on adaptive target birth intensity for linear Gaussian target dynamics was proposed. Simulation results demonstrate that …

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Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji Aug 2020

Gm(2,1) Model And Identification Algorithm Based Wind Power Generation Short-Term Prediction, Ziyun Wang, Zhicheng Ji

Journal of System Simulation

Abstract: A method based on the gray theory and identification model was proposed to predict the short-term wind power generation. GM(2,1) model was applied for establishing a wind speed prediction model with an iterative step. After the wind speed prediction procedure, a finite impulse response moving average nonlinear Hammerstein model was used in the modeling between wind speed and wind power generation. By adopting the stochastic gradient searching theory, a wind power generation forecasting algorithm was proposed. The proposed simulation shows that the presented method can forecast the real time power generation of wind turbine and raise the accuracy of …

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Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang Aug 2020

Policies Conflict Detection Algorithm Coordinated Defense-Oriented Of Firewall And Ids/Ips, Qiu Song, Jiao Jian, Dongyang Zhang

Journal of System Simulation

Abstract: Coping with the distributed and complex threaten of networking attack, the requirement of coordinated defense of Firewall and IDS/IPS are becoming more and more urgent. As the existence of uncertainty of the judgment of Intrusion performed by IDS/IPS, Firewall and IDS/IPS often perform contradict action, that the same package matched the both rules of Firewall and IDS/IPS, and conflict arose, which would lead to illegal access control or deny of legal access control. The policies conflict detection algorithm of coordinated defense of Firewall and IDS/IPS were researched. The semantic models of firewall policy and IDS/IPS policy were proposed, the …

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High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang Aug 2020

High Accuracy And Stable Transient Process Design Of Orbit Control For Space Rendezvous And Docking, Kaikai Li, Weiwei Shang

Journal of System Simulation

Abstract: In the docking phase of orbit control task of space rendezvous and docking, smooth without overshoot, good robustness and fuel-saving control are required. To this end, a transient process for orbit control was proposed, and new controllers were designed on the basis of the transient process for the space rendezvous and docking. The ultimate goal was refined to the gradual arrival goal to build the transient process between the initial coordinate and the target coordinate of the system. The output of the transient process was designed as a smooth S-type curve. Three different orbit controllers of space rendezvous and …

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Wood Structure Nondestructive Detection Based On Wavelet Analysis Ant-Colony Bp Network, Guoxiong Zhou, Xianyan Zhou, Jiejun Wang, Te Huang Aug 2020

Wood Structure Nondestructive Detection Based On Wavelet Analysis Ant-Colony Bp Network, Guoxiong Zhou, Xianyan Zhou, Jiejun Wang, Te Huang

Journal of System Simulation

Abstract: In view of the wood component glue line defect, a method of wood structure nondestructive detection was proposed based on ant colony BP neural network. The wood specimens was tested to obtain the test signal by ultrasonic testing instrument, in order to eliminate the testing effect of the tester gain control and defect size, angle variation on the test defect echo amplitude, the defect signal amplitude was needed to normalization. The wood component decomposition of ultrasonic signals was de-composite to different frequency channels by the domain band-pass characteristics of the wavelet frequency. By extract characteristic of the original signal …

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Modeling Method Of Airborne Display And Control System Based On Meta-Model Features, Zhile Wang, Jungan Wei, Yu Hui Aug 2020

Modeling Method Of Airborne Display And Control System Based On Meta-Model Features, Zhile Wang, Jungan Wei, Yu Hui

Journal of System Simulation

Abstract: Analysed of the current integrated avionics display and control system simulation problems, discussed the system’s function, composition and the simulation design method detailedly. Proposed a reconfigurable modeling method of meta-model features according to the requirements of the simulator develop. Make full used of the feature extraction method meta-model theory, the various elements that make up the system and their relationship was classified and feature abstract and description reasonably, built the meta-model of display and control system. Created the display and control system’s graphic elements, characters and Human-computer interactive interface by GL Studio. Using object-oriented techniques to make reusable class …

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Simulation And Evaluation On Handling Stability Of Wheeled Self-Propelled Gun Based On Virtual Prototype, Huibin Hu, Shuxiao Chen, Linlin Li, Liqiao Liu, Lijun Cao Aug 2020

Simulation And Evaluation On Handling Stability Of Wheeled Self-Propelled Gun Based On Virtual Prototype, Huibin Hu, Shuxiao Chen, Linlin Li, Liqiao Liu, Lijun Cao

Journal of System Simulation

Abstract: Based on the summary of usual handling stability research methods, a new kind of simulation and evaluation technology for wheeled Self-Propelled Gun based on virtual prototype and actual equipment test was put forward. In MSC.ADAMS/Car environment, virtual prototypes of suspension, tire, steering, engine, transmission subsystems and wheeled Self-Propelled gun were established. Actual equipment test and simulation based on virtual prototype of invariable radius turning test were carried out. The creditability and accuracy of virtual prototype were verified by comparing the simulation results and the test data. Steady turning characteristics were taken as example to illustrate the handling stability …

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Simulation Study On Damage Localization Of Large Generator Stator Insulation Based On Guided Waves, Li Hao, Ruihua Li, Hu Bo, Pan Ling, Qiyi Guo Aug 2020

Simulation Study On Damage Localization Of Large Generator Stator Insulation Based On Guided Waves, Li Hao, Ruihua Li, Hu Bo, Pan Ling, Qiyi Guo

Journal of System Simulation

Abstract: A stator insulation damage localization method based on guided waves was proposed. The dispersive curve was obtained by solving the Rayleigh-Lamb equations. Finite structure models of four typical groundwall insulation damage, i.e. void, delamination, longitudinal and transverse crack were established by FEM software Abaqus, in which the excitation, acquisition and propagation properties of guided wave were numerical simulated. Based on that, wavelet scalogram was used to extract the flight time of damage-scattered wave to obtain the insulation damage location. Analysis was conducted to compare the location precision under each wave modes. Simulation results indicate that the method is …

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