Heat Transfer Simulation Of Vehicle Heat Exchanger In Plateau Environment,
2019
1. Department of Military Vehicle, Military Transportation University, Tianjin 300161, China;;
Heat Transfer Simulation Of Vehicle Heat Exchanger In Plateau Environment, Xu Xiang, Wenchao Suo, Dingfu Yang, Surong Dong
Journal of System Simulation
Abstract: The effect of heat transfer caused by plateau environment in vehicle heat exchanger was investigated. The heat transfer equation for heat exchanger was modified by introducing air parameters at different altitudes. A heat transfer modeling approach for vehicle heat exchanger was proposed by using the thermal network method. The heat transfer effect of the plateau and the flow state of fluid medium were analyzed in the vehicle heat exchanger by using the simulation software FlowMaster. Simulation results show that the decrease of pressure and density of air in altitude was the primary cause to heat transfer ability. …
Interactive Modelling On Smooth Weighted Distance Surface In Hmd Vr Environment,
2019
1. School of Communication and Information, Shanghai University, Shanghai 200444, China;;2. Institute of Smart City, Shanghai University, Shanghai 200444, China;
Interactive Modelling On Smooth Weighted Distance Surface In Hmd Vr Environment, Xiaoqiang Zhu, Hongyi Pan, Xu Hao, Song Lei, Mengyao Zhu, Xiangyang Wang
Journal of System Simulation
Abstract: An interactive modelling scheme in immersive VR environment is proposed, in which the point, line and polygon skeletons are inputted by handles of HMD (Head-Mounted Device). Weighted distance field is calculated in parallel with CUDA on GPU according to the varying radii, and then the iso-surface is extracted using paralleled marching cubes. In order to avoid the non-smoothness at interactions between different distance surface components, weighted filtering kernels are utilized to smooth the skeleton-based distance field with various radii in our modelling system, so that smooth blending model is produced from multi-component distance fields. In our system, …
Integrated Generating Algorithm Of Centroidal Capacity Constrained Power Diagram,
2019
School of Computer and Information, Hefei University of Technology, Hefei 230009, China;
Integrated Generating Algorithm Of Centroidal Capacity Constrained Power Diagram, Liping Zheng, Lu Chang, Ruiwen Cai, Zhiqiang Gui
Journal of System Simulation
Abstract: Power diagram is the weighted Voronoi diagram. Centroidal capacity constrained power diagram (CCCPD) can be obtained by imposing capacity constraint and centroid constraint to the ordinary power diagram. To increase the convergence speed of existing CCCPD algorithms which optimize the weight and location of site interlacedly, an improved algorithm is proposed which optimizes all variables integratedly. Research results exhibit that the performance of the proposed algorithm is 40% higher than the traditional method.
Method Research On Collaborative Simulation Of Multi-Resolution Models,
2019
Unit 91336 of PLA, Qinhuangdao 066326, China;
Method Research On Collaborative Simulation Of Multi-Resolution Models, Gaofeng Zhang, Yujie Ji
Journal of System Simulation
Abstract: The collaborative simulation of multi-resolution models is an effective method to meet the requirement of “wide-area confrontation and local high imitation” in combat simulation. The generalized supporting platform for multi-resolution models collaborative simulation is constructed, and the collaborative simulation mechanism with mirror entity and control right dynamic migration as core technology is proposed, which can effectively solve the problem of interconnection and homomorphic mapping between multi-resolution models, as well as collaborative operation consistency issues. Under the support of this technique, the joint operation among different resolution models in a tactical deduction simulation system is stable, efficient and consistent. This …
Research On Software Reliability Based On Test Effort And Imperfect Debugging,
2019
1. Xinzhou Teachers University, Xinzhou 034000, China;;
Research On Software Reliability Based On Test Effort And Imperfect Debugging, Aizhen Wang, Lü Xun
Journal of System Simulation
Abstract: To further improve the fitting performance of the software reliability models, imperfect debugging and test effort were considered in the progress of establishing the model of software reliability. The best performance test effort function was selected from some kinds of existing S-type functions through the method of simulation. The influences of test effort were considered in the software reliability model with imperfect debugging. The new model was established. Two groups of public data were used to verify the ability of the new model. The test results showed that the software reliability growth model considering test effort under imperfect …
Research On Augmented Reality Method Based On Unmarked Recognition,
2019
1. College of Computer and Software Engineering, Huaiyin Institute of Technology, Huaian 223001, China;;
Research On Augmented Reality Method Based On Unmarked Recognition, Li Qian, Shangbing Gao, Zhigeng Pan, Zhengwei Zhang, Chenghua Fang, Shengquan Wang
Journal of System Simulation
Abstract: As a kind of technology of superposing the virtual objects upon reality scene, AR (Augment Reality) expands the information quantity of the actual scene by virtual information. Aiming at the deficiency of previous AR application methods, the AR application method of unmarked recognition based on the optimized filtering was proposed in this paper. In this algorithm, filtering was used for image preprocessing to solve the poor matching efficiency problems of the past recognition algorithms, then three-dimensional model was established in two-dimensional images and the model was rendered in the two-dimensional plane. The experimental results show that, compared with …
Study On Multi-Objective Collaborative Optimization Of Switched Reluctance Motor Based On Chaos Fruit Fly Optimization Algorithm,
2019
1. National-Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology,Hunan University of Science and Technology, Xiangtan 411201, China;;
Study On Multi-Objective Collaborative Optimization Of Switched Reluctance Motor Based On Chaos Fruit Fly Optimization Algorithm, Xiaoping Zhang, Shenghua Rao, Zhang Zhu, Zhao Xuan
Journal of System Simulation
Abstract: Switched reluctance motor (SRM) is difficult to get the best solution due to its complicated process and high professional requirement. Therefore, a collaborative multi-objective optimization method based on chaotic fruit fly algorithm is proposed in the paper. The initial solution is obtained by traditional design method, and the performance is verified by finite element analysis (FEA). The extreme learning machine (ELM) is applied to obtain the non-parameter model of SRM based on the sample data from FEA. The chaotic fruit fly algorithm is proposed for design optimization. Simulation results demonstrate that better coefficient of torque ripple and efficiency can …
Study On The Effect Of Salt Fog On Polluted Insulator Under Switching Impulse,
2019
1. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding 071003, China;;
Study On The Effect Of Salt Fog On Polluted Insulator Under Switching Impulse, Jianghai Geng, Zhong Zheng, Jiang Shuo, Fangcheng Lü, Yunpeng Liu, Songsong Zhou
Journal of System Simulation
Abstract: Water is mixed with soluble conductive material in haze so that the air has certain conductivity, resulting in extra mixed pollution components on the surface of the existing polluted insulator. In this paper, with the XP10-160 ceramic suspension insulator being used as the sample, the switching impulse test of the clean and polluted insulator is carried out by simulating high conductivity fog under the natural environment by salt fog method. This paper analysis the flashover characteristics of switching impulse under different salt density and water fog conductivity. The effect of high conductivity fog on the field intensity distribution of …
Research Of Nonlinear Time Series Prediction Method For Motion Capture,
2019
Beijing Institute of Technology, Beijing 100081, China;
Research Of Nonlinear Time Series Prediction Method For Motion Capture, Tianyu Huang, Yunying Guo
Journal of System Simulation
Abstract: In this paper, we study the nonlinear time series prediction method for action capture. A prediction method based on the capture data is studied and implemented by analyzing human motion data to solve the data loss and correction problem caused by sensor failure. Based on this research purpose, the simulation experiment assumes that a sensor in the sequence of actions fails, then uses eight kinds of machine learning methods, and evaluates them with six indexes. The prediction results of different methods are compared and the predicted motions are visualized. Through the experiments, data prediction accuracy by random forest, decision …
Simulation Evaluation Method Of Mission Sustainability For Operational Unit,
2019
1. Academy of Army Armored Force, Beijing 100072, China;;
Simulation Evaluation Method Of Mission Sustainability For Operational Unit, Yan Xu, Junhai Cao, Tailiang Song, Gao Long, Zhang Qiang
Journal of System Simulation
Abstract: To analyze and evaluate support capabilities of operational units and scientifically describe the operational mission sustainability of weapon systems, the typical mission models for individual operational unit and operational units were established according to system engineering ideology. The mission status of operational units was defined, and the parameters including mission sustainability and equipment availability of operational units were proposed. An operational unit mission process simulation model was established with the agent-based method, which provides a simulation method for operational unit mission sustainability evaluation and technical means for the operational unit support capability assessment problem. A case study of …
Model Of Target Assignment In Joint Fire Strike Operations,
2019
Public Platform Center, National Defense University, Beijing 100091, China;
Model Of Target Assignment In Joint Fire Strike Operations, Chen Hui, Yaping Ma
Journal of System Simulation
Abstract: The assignment of firepower resources in combination to the target is one of the key problems in planning work of joint fire strike operations. According to the characteristics of joint fire strike target assignment problem, and synthetically considering the factors such as strike sequence, damage grade, threats, cost-effectiveness, damage, a multi-objective optimization model of target assignment problem is established. By combining the MOEA/D and the multi-level co-evolutionary framework, a multi-objective optimization model is proposed to solve the target assignment based on the multi-level cooperative MOEA/D algorithm, and the related genetic evolution mechanism is designed. The simulation …
Asymmetry Investigation On Radial Tire Contact Pressure Distribution,
2019
Ningbo University, Faculty of Mechanical Engineering and Mechanics, Ningbo 315211, China;
Asymmetry Investigation On Radial Tire Contact Pressure Distribution, Haibo Huang, Xudong Yu, Jinpeng Liu, Yao Zhen
Journal of System Simulation
Abstract: The asymmetric pressure distribution in tire contact patch has significant impact on the vehicle fuel economy, tire wear and tire dynamics. In this paper, a FEA model for 205/55R16 semi-steel radial tire was built and verified by static pressure experiments. The influences of tire structural parameters and vehicle driving parameters on asymmetry factor for exploring the asymmetry of the pressure distribution in contact patch were investigated in the steady-state rolling condition. The results show that the influence of the parameters ranging from +50% to -50% on the asymmetry factor of the contact pressure distribution is nonlinear. The impact order …
Multi-Objective Optimization Of The Main Circuit And Control Parameters Of The Buck-Boost Matrix Converter,
2019
1. National-Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Hunan University of Science and Technology, Xiangtan 411201, China;;
Multi-Objective Optimization Of The Main Circuit And Control Parameters Of The Buck-Boost Matrix Converter, Xiaoping Zhang, Wenhao Song, Hongping Zhu
Journal of System Simulation
Abstract: The optimization of main circuit parameters and control parameters of the Buck-Boost matrix converter has been investigated. The study takes the main circuit parameters and control parameters as optimization object and takes the harmonic distortion of output voltage, capacitance voltage deviation and inductance current deviation of the converter as optimization target. Firstly, multi-objective optimization satisfaction function is established correspondingly. Meanwhile, the fitness function is built and solved to achieve a set of optimizing parameters based on the fruit fly algorithm, which makes each optimizing target achieve synergistic optimal. Finally, the optimization effect is verified by simulation. The results show …
Modeling And Analysis For Underwater High-Speed Supercavitaing Torpedo,
2019
1. Department of Control and Engineering, Harbin Institute of Technology, Harbin 150000, China;;
Modeling And Analysis For Underwater High-Speed Supercavitaing Torpedo, He Zhen, Aiping Pang, Jinghua Wang, Fanwei Meng, Guangxiong Wang
Journal of System Simulation
Abstract: Supercavitation technology can significantly reduce skin-friction drag of underwater torpedo, and therefore dramatically increase the velocity and attack power of underwater weapons. Because the torpedo is almost entirely enveloped by a supercavity, the hydrodynamic problems of the high-speed supercavitating torpedo (HSST) are complex. The hydrodynamic forces acting on cavitator, fin, and the planing force along the longitude plane of the underwater HSST are analyzed. A benchmark nonlinear dynamics model of supercavitating torpedo is established based on the basic dynamic equations of the longitude plane, and the specific parameters of HSST are calculated. In the longitude plane the motion equation …
In-Cylinder Process Simulation Of Swashplate Revoloving Cylinder Piston Engine Based On Fluid-Structure Interaction,
2019
The 705 Research Institute, China Shipbuilding Industry Corporation, Xi'an 710077, China;
In-Cylinder Process Simulation Of Swashplate Revoloving Cylinder Piston Engine Based On Fluid-Structure Interaction, Li Xin, Chengshi Yang, Peng Bo
Journal of System Simulation
Abstract: Using dynamic mesh technology, In-cylinder working process of the engine is detailedly designed in this article regarding the new swashplate revolving cylinder piston engine. We establish the numeral simulation model of the engine working process based on fluid-structure interaction, the pressure and temperature distribution of the In-cylinder gas in the six thermal process is obtained, and the temperature distribution of the hot end components is presented. The results show that the working process of the engine is reasonably organized. The biggest thermal load appears in the intake flow process. The wall temperature of the gas side is lower …
Numerical Simulation Of Thermal Properties Of Active Phased Array Antenna,
2019
1. China Electronics Technology Group Corporation No.10 Research Institute, Chengdu 610036, China;;
Numerical Simulation Of Thermal Properties Of Active Phased Array Antenna, Wang Yong, Ting Lu, Longwen Wu, Changwu Xiong, Weng Xia, Ping'an Du
Journal of System Simulation
Abstract: The grid priority modeling and multi-level meshing techniques are applied to analyze the thermal properties of the active phased array antenna with the micro/mini channels cooling method for simplifying modeling process, reducing the mesh quantity and saving the cost of computation effectively. The multi-level meshing technique can refine the mesh near the boundary of the complex components significantly without changing the mesh quantity in the model, which improves the mesh’s quality obviously. Through the thermal simulation and experiment measurement of the antenna, the temperature and pressure field are obtained. It is proved that the addressed approach can …
Abnormal Behavior Detection Via Super-Pixels Time Context Feature,
2019
Key Laboratory of Advanced Control Light Process, Jiangnan University, Wuxi 214000, China;
Abnormal Behavior Detection Via Super-Pixels Time Context Feature, Chen Ying, Dandan He
Journal of System Simulation
Abstract: In order to accurately locate the abnormal behavior, an anomaly detection method based on time context features of super-pixels is proposed. For feature representation, the video frames are firstly segmented into super-pixels. The super-pixels of foreground are then selected according to their pixel ratios of foreground. Super-pixels matching adjacent frames are selected based on the gray-level histogram and the information of location to enhance the temporal context of super-pixel features. The statical value of multilayer histogram of optical flow of matched super-pixels are taken as the feature for detection. In the phase of detection, the sparse combination learning algorithm …
An Anti-Occlusion Adaptive Particle Filtering Algorithm,
2019
1. School of Computer Science and Engineering, Changshu Institute of Technology, Changshu 215500, China;;2. Provincial Key Laboratory for Computer Information Processing Technology, Soochow University, Suzhou 215006, China;;
An Anti-Occlusion Adaptive Particle Filtering Algorithm, Li Ju, Mingwei Cao, Yu Ye, Xia Yu, Lifan Zhou
Journal of System Simulation
Abstract: Considering the influence of local occlusion on particle filter tracking algorithm, an anti occlusion adaptive particle filtering algorithm is proposed. It adopts a rectangle as the tracking window, and uses the K mean clustering algorithm to complete particle clustering in resampling, and then obtains the particle subgroup. It estimates the final state according to particles subgroups, and modifies the tracking window. When the area changes more than 5%, the tracking window maintains the same as the one in last frame. Otherwise, the tracking window will change according to the size of moving object, which is a self-adaptation process. At …
Fusing Local And Global Features For Human Action Recognition,
2019
1. Department of Computer Science and Technology, Hefei University, Hefei 230601, China;;
Fusing Local And Global Features For Human Action Recognition, Tang Chao, Miaohui Zhang, Li Wei, Cao Feng, Xiaofeng Wang, Xiaohong Tong
Journal of System Simulation
Abstract: Recognizing human actions according to video features is an important research topic in a wide scope of applications. In this paper, we propose a robust human motion detection method that combines canny operator with the combination of local and global optic flow methods. Meanwhile, this paper presents a simple but efficient action recognition algorithm using fusion visual features. The mixed features fuse two action descriptors, namely centre distance-based space time interest point and curvature function-based Fourier descriptors. The frame-based human action classifier is developed using random forests algorithm. Experimental results show that the proposed method is accurate, efficient and …
Three-Dimensional Imaging Modeling And Simulation Of Ships Based On Wide-Band Monopulse Radar,
2019
1. Beijing Electro-mechanical Engineering Institute, Beijing 100074, China;;
Three-Dimensional Imaging Modeling And Simulation Of Ships Based On Wide-Band Monopulse Radar, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu
Journal of System Simulation
Abstract: A three-dimensional imaging model for ship target on sea surface is developed based on wide-band monopulse radar system and synthetic aperture radar (SAR) system. The time-varying electromagnetic (EM) scattering of ships is calculated according to the SAR geometry and the monopulse antenna model. The signal received by every antenna element is obtained, and then, the time-domain signals in the sum, azimuth and elevation difference channels are established. Through analyzing the three-dimensional image results in different grazing angles, the model validity is demonstrated.
