Decoupling And Partial Iterative Calculation Method Of Flexibility Dynamics,
2021
1. Shanghai Rey Laboratory of Aerospace Intelligent Control Technology, Shanghai 200233, China; ;2. Shanghai Aerospace Control Technology Institute, Shanghai 200233, China;
Decoupling And Partial Iterative Calculation Method Of Flexibility Dynamics, Xianzhong Wang, Minlan Tang, Jinfang Dong
Journal of System Simulation
Abstract: Some spacecrafts have large solar panels and a lot of propellant. These spacecrafts with flexible modes can reach hundreds of order. High-powered computers are needed for these spacecrafts,flexibility dynamics iterative operation within several milliseconds. The measures of decoupling flexibility vibration from body rotation and partial iterative calculation were applied to avoid no convergence of the flexibility dynamics iterative operation because of iterative computing error. The parameters of flexible dynamics model which were decoupled could be calculated off-line. The amount of calculation was decreased for the decoupled flexibility dynamics model as parameters could be computed before simulation. The method doesn't …
Construction Of Real-Time Simulation Model Of Fire Fighting Pump System Of Airport Fire Engine,
2021
1. Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance of Civil Aviation University of China, Tianjin 300300, China; ;2. Ground Support Equipments Research Base of Civil Aviation University of China, Tianjin 300300, China;
Construction Of Real-Time Simulation Model Of Fire Fighting Pump System Of Airport Fire Engine, Lishan Jia, Liwen Wang
Journal of System Simulation
Abstract: To the simulation of fire fighting pump system of airport fire truck in driving training simulator of airport fire engine, the method of construction of simulation model of fire fighting system was promoted. Simulation model of centrifugal pump of airport fire truck was constructed, which was designed for simplification to satisfy the real-time performance of running of system. Considering fire fighting operation of fire truck, simulation model of operation of fire fighting pump system was constructed, which could not only simulate common fire fighting operation of fire truck, but also simulate running status of low pressure of fire fighting …
Modeling And Simulation Of Detection Probability For Whole Airspace Oriented Optical Target,
2021
Beijing Institute of Tracking adTelecommunication Tecinology. Beijing 100094. China;
Modeling And Simulation Of Detection Probability For Whole Airspace Oriented Optical Target, Hongie Dang, Haozhang Yu, Luofeng Deng, Guanlei Jiang
Journal of System Simulation
Abstract: To ensure the target within view field is the precondition of the tracking measuring equipment working normally, which is described by probability in engineering. A precise method of optical equipment detection probability was addressed aiming at the maneuverable targets, an exact description method of the whole airspace detection according to optical sensor was put forward, and a detection probability model for optical target was set up. A calculation method suited the model was confirmed,which was given by simulation analysis of the algorithm's calculation performance, the influence of model various parameters on algorithm was analyzed, and a comparison was given …
Research On Safety Protection Compositive Simulation Test Bed For Electric Secondary System,
2021
1. Sbenyang Institute of Enginecring Shenyang 110136, China; ;2. Shenyang Kay Laboratory of Information Security for Power System, Shenyang 110136, China; ;
Research On Safety Protection Compositive Simulation Test Bed For Electric Secondary System, Zheniu Zhou, Angang Zheng, Heping Zou
Journal of System Simulation
Abstract: Existing information and network security simulation methodologies of model construction were analyzed and compared with each other, and applicability and limitations of each of them were summarized. Then according to safety protection needs to electric secondary system, based on previous research results of security simulation aiming at individual and partial objects, a safety protection compositive simulation test bed was designed and implemented in which eight kinds of simulation technology and solutions were integrated. This test bed included four simulation layers and seventeen categories of simulation test, and achieved a large scale, distributed, linkage-type simulation for comprehensive information security. This …
Rendezvous And Docking Digital Simulation System Based On Matlab,
2021
Space Control and Inertial Technology Research Center, Harbin Institute of Technology, Harbin 150001, China;
Rendezvous And Docking Digital Simulation System Based On Matlab, An Hao, Zhenshen Qu, Changhong Wang
Journal of System Simulation
Abstract: On the background of lunar orbit rendezvous and docking (RVD), a framework of the simulation system was designed. The dynamics, navigation and controller of the RVD system were built in detail, and a Simulink model of the lunar orbit RVD was established based on these results. A user interface and a 3D dynamic demonstration were designed to make the operation convenient and intuitive.The digital simulation system can be used to verify the lunar orbit RVD missions incipiently. Furthermore,a semi-physical RVD simulation was taken by using the modified model. The simulation results show the effectiveness of the inertia-visual integrated navigation …
Study On Key Nodes Analysis Method Of Space Information Network,
2021
1. The Departoment of Infomatio Operation & Command Training. National Defense University. Bejing 00091, Ching; ;
Study On Key Nodes Analysis Method Of Space Information Network, Mingzhi Zhang, Luo Kai, Wu Xi
Journal of System Simulation
Abstract: Because of the dynamic of the Space Information Network (SIN), the key nodes analysis should be considered in a time section. The method of the key nodes analysis of SIN was introduced based on time slice. On this basis, combining with the features of satellite, a new method of the key nodes analysis of SIN based on accumulation pattern was proposed. The new method used the weighted processing technology to the access time and the access number, and then transformed the SIN to a static weighted network. Through the simulation using STK and MATLAB, the results of experiments show …
Interference Alignment Based Throughput Optimization Model Of Multi-Hop Networks,
2021
Electronic Engineering Institut, Hefei 230037. China;
Interference Alignment Based Throughput Optimization Model Of Multi-Hop Networks, Zui Xiong, Keren Wang, Jin Hu, Feng Hui
Journal of System Simulation
Abstract: Due to its benefits of enbancing the spectrum utility in information theory, interference alignment (IA) is quickly adopted in multi-hop wireless networks. The constraints of "node activity in the existing throughput optimization model with IA are insufficient for converging to the optimal solution; the feasibility of IA is not involved. Thus, some measures were taken to compensate for the problems above.The longitudinal constraints of node activity were presented, and the feasibility condition of IA was discussed by the means of setting constraints on the data rates and the macimal number of interfering links at each node. The simulation results …
Co-Simulation Of Intelligent Lower Limb Assist Device Virtual Prototype,
2021
College of Communicatio Engineering, Jlin University, Changchun 130000, China;
Co-Simulation Of Intelligent Lower Limb Assist Device Virtual Prototype, Zhenze Liu, Fengming Wang, Xuange Zhang, Cangqiong Yin
Journal of System Simulation
Abstract: A virtual prototype model of power assist device for lower extremity was established to improve the efficiency and reliability of the power assist device design. The mechanical model using software CATIA was introduced to ADAMS to establish the virtual model, so as to carry out the kinematics and dynamics simulations, and combined the previous model established by ADAMS with the control model established in MATLAB/Simulink to realize the co simulation of the system. According to the characteristics of human gait data, PID control algorithm was used to control lower limb power system. The simulation results demonstrate that the control …
Local Deformation Method For Soft Cylindrical Model,
2021
1. Bejing Technology and Business University, Beijing 00048, China; ;
Local Deformation Method For Soft Cylindrical Model, Hongqian Chen, Fang Yi, Qianyu Yang, Fengxia Li, Chen Yi
Journal of System Simulation
Abstract: To simulate the bending effect for the soft cylindrical objects in realtime, a deformation method was proposed that could achieve the detiail-preservation and surface area-preservation. The method obtained the shape properties such as the bottom and the height from the original cylindrical model. The base model consisted of the regular mesh was built according to the shape properties. The detail model could be obtained by the raidus function of separating from the base model. The uniform deformation algorithm for the base model was adopted to decrease the complexity of the processing. The damping oscillation curve was employed t0 simulate …
Simulation Method For Large-Scale Water Area In Rainy Days,
2021
School of Computer Science & Technology, Soochow University, Suzhou 215006, China;
Simulation Method For Large-Scale Water Area In Rainy Days, Tingting Yao, Zhongming Xie, Yunfei Li
Journal of System Simulation
Abstract: The rendering of large-scale water area rain scene is one of the most challenging problems in computer graphics, and a method of rendering large-scale water area rain scene was proposed. By introducing the improved wave equation into the fuctuation of water surface and the interaction of water and raindrop, and incorporating the periodicity and wind tendency of FFT, an interactive fluctuation of water mathematical model in rainy days was established, based on which an interactive height map was rendered. Through the lighting rendering, the reflection effect and rain streaks were simulated. In order to enhance the efficiency, the level-of- …
Study On 3d Battlefield Construction Based On Uav Remote Sensing Images,
2021
Equipment Academy of PLA, Beijing 101400, China;
Study On 3d Battlefield Construction Based On Uav Remote Sensing Images, Bin Liu, Xiangning Chen, Lianpeng Guo
Journal of System Simulation
Abstract: According to the demand for rapid construction of 3D battlefield environment, an automatic 3D battlefield environment construction technology was proposed based on UAV Remote Sensing Images. The specified area remote sensing images were captured using UAV The sparse reconstruction and calibrations were obtained using SFM method. The dense reconstruction was done using multi-view stereo matching algorithms. The scene surface was fit using dense points and texture mapping was done to generate 3D battlefield environment. The experimental results show that the proposed method can quickly reconstruct the battlefield, and improves the efficiency of 3D modeling. It has significant intelligence in …
Real-Time Shadow Algorithm Improvements In Digital Earth Scenarios,
2021
1. Computer Department, Taizhou Vocational & Technical College, Taizhou 233 100, China; ;
Real-Time Shadow Algorithm Improvements In Digital Earth Scenarios, Defa Zhang, Yiwei Wang, Wang Rui
Journal of System Simulation
Abstract: Studying real- time shadow generating and rendering algorithms in digital earth virtual reality scenes, a new method was provided to improve the shadow rendering quality and efficiency of earth scenes, based on the characteristics of huge dataset, huge coordinates and frequent scheduling mechanisms. Comparing with the classics CSM shadow map algorithm, the method proposed focused on the optimization of shadow splitting ranges, as well as a new pipeline separating the rendering steps of terrain tiles and objects, so to improve both the correctness and efficiency. analyzes The problems caused by shadow rendering while running dynamic terrain tile scheduler simultaneously …
Research Of Liver Solid Texture Synthesis And Mapping Method With Cuda Acceleration,
2021
Institute of Physics and Information Engineering, Fuzbou Univrsity, Fuzhou 350002, China;
Research Of Liver Solid Texture Synthesis And Mapping Method With Cuda Acceleration, Guodong Chen, Hanxin He
Journal of System Simulation
Abstract: A liver solid texture synthesis and mapping method based on Computer Unified Device Architecture acceleration (CUDA) was proposed to solve the problem of the overlong time consuming within the period of synthesizing liver solid texture in traditional way. The relevance in traditional serial texture synthesis was elim inated in the new method. The work of selecting and distributing blocks of space synthesis of the liver solid texture was processed by using the parallel processing of multiple threads based on CUDA. Both the procedures of tinting the surface grid nodes of liver model and internal point set traversal in mapping …
Mobile Robot Slam Simulation With Multi Measurement Update,
2021
1. Information Communication College, Shanghai Maritime University, Shanghai 201 306, China; ;
Mobile Robot Slam Simulation With Multi Measurement Update, Yafang Xu, Zuoleit Sun, Liansun Zeng, Zhang Bo
Journal of System Simulation
Abstract: Aiming at the problem of the accumulation of linearization error in the nonlinear system linearizing of Simultaneous Localization and Mapping (SLAM) in mobile robot, an algorithm named multi measurement update was put forward according to the analysis of Fisher information. In order to compute the state estimation after each measurement update, the Fisher information weight relationship between prediction variable and update variable was made use of Due to a number of data association with an estimation which was more close to the real data than the former, the algorithm could achieve a more accuracy posterior state. As a result, …
Indoor Positioning System Algorithm Based On Rfid,
2021
Institute of Electrical Automation, Jiangnan University, Wuxi 214122, China;
Indoor Positioning System Algorithm Based On Rfid, Xuejun Shi, Zhicheng Ji
Journal of System Simulation
Abstract: In order to solve the radio frequency identification (RFID) positioning problem, the working principle, advantages and disadvantages of two positioning methods (AOA and TDOA) were analyzed in detail by comparison, on the basis of which, an indoor positioning hybrid approach of Ultra High Frequency (UHF) RFID was proposed. This proposed approach took the AOA as the core and integrated the idea of time diference in TDOA. Moreover; the stepping motor and UHF reader were used simultaneously instead of antennas array to make UHF RFID reader whirl around an axis. Therefore, it is easy to scan each tag that can …
Application-Aware Cross-Layer Enrgy-Eficient Routing Scheme,
2021
1. Computer School, Wuhan Universit, Wuhan 430072, China; ;2. Scool ofComputer and lfomatio Scieae, Hoboci Eginccing Unvesit, Xiaogo 4000 China;
Application-Aware Cross-Layer Enrgy-Eficient Routing Scheme, Xu Fang, Hiyin Zhang, Wang Jing, Xu Ning, Zhijong Wang, Deng Min
Journal of System Simulation
Abstract: An aplication- aware cross-layer energy-effcient routing scheme (ACER) was presented to minimize the effect of supplt of terminals in ad hoc network composed of smart mobile devices. Features of energy consumption were sensed by application aware energy model with the application monitor and the remaining energy monitor. Stability of network path was monitored by link stability monitoring module in Data link layer. As the scheme used the idea of cross-layer design, network topology information, application-aware information in application layer and link-stability were utilized synthetically to make routing deisions in network layer;Simulations were crried out on NS2 platform. The …
Trnek Befor Detet Agoritmn For Weak Iret Based On Ergodic Hogh Tasform,
2021
1. Institute of Infomation and Control Technology, Hangzhou Dianzi University, Hangzhou 310018,China; ;
Trnek Befor Detet Agoritmn For Weak Iret Based On Ergodic Hogh Tasform, Yunfei Guo, Xiaofeng Zheng, Dongliang Peng, Zebin Zeng
Journal of System Simulation
Abstract: The performance of track-before-detect (TBD) algorithm based on standard Hough Transform is not satisfied due to low detection probability and long elapsed time. For this problem, an Ergodic Hough Transform based TBD method was proposed. The raw radar echo whose amplitude exceeded the first threshold was stored separately and stacked into a data space; all diferent data were combined to calculate line parameter which then was mapped into a parameter space and the amplitude of each paired wae added to an accumulator. All cells whose amplitude exceeded the second threshold was used to estimate the last line parameter and …
Test Data Compression Based On Logical Operationand Dimidiate Partition,
2021
1. Department of Science Research, Anqing Teachers College, Anqing 246011, China; ;
Test Data Compression Based On Logical Operationand Dimidiate Partition, Wu Qiong, Huang Li
Journal of System Simulation
Abstract: A new test data compression based on logical operation and dimidiate partition was proposed. The whole test was partitioned to several length-fixed blocks. Then logical operation was applied into runs of Is or 0s or alternating bits. They were turned into all 0s. For the others, dimidiate partition technique was used until they got to the minimum length. The length of code words could be expressed by the times of dimidiate and it is easy to coding when they are turned into all 0s. Compared with traditional data-coding methods the depression structure is simple and reduced the costs of …
Study Of Improved Generalized Predictive Control In Ball Mill Application,
2021
School Of Automation Engineering,Northeast Dianli University, Jilin 132012, China;
Study Of Improved Generalized Predictive Control In Ball Mill Application, Lingfang Sun, Jingmiao Sun
Journal of System Simulation
Abstract: Direct-fired pulverizing system with double inlets and outlets is regarded as important generating equipment in power plant, which has characteristics of nonlinear, multivariable, strong coupling and time-varying. Started from the mechanism of law, the mechanism mathematical model of the ball mill was established and a certain amount of disturbance transfer ftinction model was added in a mathematical model of the mechanism of input variables to give step disturbance tests to establish the ball mill system. Combining the most widely used basic control--PID control as industrial process control, and on the basis of general generalized predictive control algorithm, the generalized …
New Identify Based Proxy Signature Scheme,
2021
1. Department of Information Engineering, Jianghai Polytechnic College, Yangzhou 225101, China; ;
New Identify Based Proxy Signature Scheme, Xiaojing Hong, Bin Wang
Journal of System Simulation
Abstract: Proxy signature schemes allow a proxy signer to generate proxy signatures on behalf of an original signer. Mambo, et ah first introduced the notion of proxy signature and a lot of research work can be found on this topic nowadays. To simplify key management, many identity based proxy signature schemes were proposed. However, some existing schemes are vulnerable to proxy key exposure attack. It is necessary to propose a security model for identity based proxy signature schemes against proxy key exposure attack. Then an efficient scheme based on pairings was presented, which is provably secure in the random oracle …
