Volume17 Number 6(2005)

Title Author   Abstract
Development and Formation of Simulation Science WANG Zi-cai After development stage, mature stage and higher stage, the simulation technology enters into a new stage about simulation of complexity system. Simulation is a synthesis intercross science under the condition of development of modern science and technology. Simulation comprises three basic theories: model theory, methodology and science measure, and evaluation theory. Model is the direct and clear way to describe the system and its characteristics quantity. System simulation should follow the system theory to ensure every method. Another important hand in system simulation is the capability evaluation. Capability evaluation of system simulation includes reliability, maintainability, functional of system and reliability of simulation etc, thereinto reliability of simulation is the most important guideline.
Simulation Science and Technology in Military Transformation WANG Jing-ye Military transformation is the primary content of revolution in military affairs. Simulation science and technology is one of the significant supports in the military conversion. It has been applied in discovery, in verification and innovation in the course from national defense strategy to joint operations concepts and joint operations capability. It has been acknowledged that the simulation systems are equipments and the simulation capability is battle effectiveness. It will significantly support the revolution in military affairs to enhance the theory research and common basic environment research of simulation science and technology on the basis of settling the problems of simulation creditability step by step.
Simulation and Education WU Chong-guang simulation science and technology is not only a new education method, but also a new means of practice and experiment. More importantly, it is also the basis of intelligent education in future. All of these views are verified in practical application.

Studies and Applications of Knowledge-based

Product Development Integration System		 LI Shao-bo, XIE Qing-sheng It is studied the key technologies, application framework, development and application realization of knowledge based product development integration system, and brought forward the system framework, function system framework of knowledge based product development integration system and product development flow description. Based on the studies and analysis of design knowledge definition, rules & cases reasoning method which includes algorithms of attribute reduction and case reasoning etc., the knowledge repository is built, and the knowledge based product development integration system has been developed for the first time. The prototype system can intellectually assistant product mechanism design and electronic design.
Key Technologies in Construction of Network-Centric Warfare Concept Based Virtual Battlefield WANG Zhou, PENG Xiao-yuan, LI Ning Evolution of information technology caused the revolution in military affairs. A new warfare concept, Network- Centric Warfare evolves as a future combat form. On the other hand, IT (especially Modeling/Simulation technology) provides means to study the revolution itself. We focus on discussions of key technologies in the construction of Network-Centric Warfare concept based distributed virtual battlefield, and put emphasis on the architecture design of this kind of system. Some other relative technologies, such as data-link modeling, cognitive and behavior modeling are also mentioned.
Algorithm of TSP Based on Sticker Systems of DNA computing DONG Ya-fei, TAN Gang-jun, ZHANG She-min The traveling salesman problem (TSP) is a hard NP complete problem, which has wide applications in the engineering. The similar questions aren’t solved effectively by using current calculation method, because the time needed for computation is increasing exponentially with the problems scale. DNA computing is a new calculation method, and the sticker system is an abstract DNA computing model that based on sticking operations. The traveling salesman problems are availably solved by being transformed to solve the Hamilton circle of the minimal weight value in the evaluate graph, and using the massive parallelism of sticker system.
Model Management In Computer Generate Force MA Yao-fei, GONG Guang-hong, PENG Xiao-yuan, ZHOU-bo, WANG Ya-nan A prototype of model management system called Model-Base Management System (MBMS) has been developed to manage simulation models encapsulated with COM specifications. Several key techniques, including COM/DCOM, IDL, XML, are applied to serve as the foundation of the system. The system is firstly applied in CGF. A primary test shows MBMS could meet the demand of managing mounts of models used in CGF. The developer could find proper models and get the full knowledge about how to use them rapidly by viewing model information through MBMS, which greatly speeds up the develop process.
Remote Controller Design of Networked Control Systems Based on Self-Constructing Fuzzy Neural Network LI Yi, PENG Qin-ke, HU Bao-sheng A self-constructing fuzzy neural network (SCFNN) is proposed to design remote controller in networked control systems (NCSs). The structure and parameter learning phases are preformed concurrently and online in the SCFNN. The structure learning is used to obtain a set of fuzzy logic control rules and a proper fuzzy partition of input space, while the parameter learning is used to adjust parameters of the membership function and weights of the consequent part of the fuzzy rules based on the supervised gradient descent method. The initial SCFNN consists of input and output nodes only. In the learning process the nodes of the middle layers, which correspond to the membership functions and the fuzzy rules, are created gradually, so a set of fuzzy rules is achieved dynamically. Numerical results on a test system using Profibus-DP network are presented and compared with those of the modified Ziegler-Nichols method. The results show the effectiveness of SCFNN in designing remote controller for NCSs.
Applications of Object-Oriented Technique and UML in Scenario Generation System LI Yu-ping, MAO Shao-jie, ZHANG Gui-ling An approach of developing an object-oriented Scenario Generation System (SGS) for the C3I simulation test platform through applying the object-oriented technique and UML is introduced. By using UML in the SGS analysis and design, an object-oriented SGS framework is established, the modeling is more visualized and easily understood. The SGS software has high stability in software framework and excellent model reusability, which is easy to use and to conduct parallel simulation.

Numerical Simulation and Control of Gray System

for Radial Active Magnetic Bearing

　

 XIE Qin-sheng, CHEN Lun-jun, LUO Yan-ke, MA Yan-ping Taking the active magnetic bearing as a research object, the gray system control method is suggested for the stable control of rotor system by means of the control theory of gray system, and the numerical simulation is carried out. Dynamic model of rotor system and transfer function on radial active magnetic bearing are established. According to gray system theory, the control system has been designed. Numerical Simulation results show that rotor system controlling effect is stable and effective.
Backstepping Method Modeling for Position Servo Controller of Permanent Magnet Synchronous Motor SHEN Yan-xia, WU Ding-hui, Li San-dong, JI Zhi-cheng A novel approach based on backstepping has been proposed to counter the effects of the nonlinearities between the phase currents and rotor velocity. First, we view the motor as a torque source and thus design a desired torque signal to ensure that the load follows the desired position trajectory. Then we utilize a simple commutation strategy to restate the desired torque signal as a set of desired current trajectories. Finally, the voltage control inputs are formulated to force the electrical winding currents to follow the desired current trajectories. A high performance position servo system of Permanent Magnet Synchronous Motor (PMSM) is designed using the proposed method. The simulation results show that the tracking error goes to zero exponentially fast for electromechanical dynamics.
Resources Management and Simulation of Product Development ZU Xu, HUANG Hong-zhong, ZHOU Feng, GU Ying-kui Resource modeling is an important problem in modern product development process management. The resources in product development process, their properties and classification have been discussed in detail, and the proper resource classification for the modeling is also acquired. A product development process model based on resources distribution and control is established by a Colored Petri Nets simulation software. Quantitative analysis and optimal allocation of resource can be realized by the model’s interactive simulation. The result analysis of the proposed model illustrates that it is a good method in product development resources modeling.
Model and Simulation of Benefit Planning for Multiple-product-line with Limited Buffers JIANG Min, WANG Ting-ping, YAN Hong-sen Since the manufacture of large-scale products is made through different lines and there is an up-down interaction structure among the lines, a new problem for production planning is therefore brought out. A harmonious model of production planning for a class of up-down lines with limited buffers is studied and an interaction structure for the products is presented. A harmonious benefit planning model for multiple-product-line is built up. The model is usually non-linear with a very large dimension, so a rapid algorithm—model decomposition method is put forward. The method decomposes the highly dimensional model into several small ones with lower dimension so as to increase calculation speed. Simulation results show that the proposed algorithm is efficient and feasible.

Petri Nets-based Modeling and Performance Analysis

of Integrated Avionics Bus System with Emergency Message		 ZHANG Jian-dong, GAO Xiao-guang, WU Yong, SHI Guo-qing In the design process of integrated avionics system, the performance indices of bus system are closely related to the indices of the whole system. Therefore, the study on the bus system is crucial. It is offered a set of models and relevant algorithms which are used to evaluate integrated avionics bus system with emergency message based on deterministic and stochastic Petri nets (DSPN). The solving of the models gives two important performance indices—busload and delay time. And the analysis of performance curve can provide an important theoretical basis for the design and improvement of the system.
Modeling and Simulation of In-flight Fueling for a New Type of Fighter SUI Cheng-cheng, YOU Yong, YANG Yong-tian, YOU Jun-sheng In-flight fueling of fighter is one of the most important methods to improve the battle effectiveness of Air Force. Real-time modeling of in-flight fueling is the key part of in-flight fueling simulation system. The formation and distribution of wake flow behind a large aerial tanker are discussed, Then the mathematic model of disturbance to the refueled aircraft during refueling is given. And, the change of total mass and CG of refueled aircraft during refueling will cause the change of stability and controllability.
Novel Qualitative Simulation Technology Based on SDGfor Hazard Analysis ZHANG Bei-ke, WU Chong-guang Safety has become a serious problem in the front of governments around world. In order to study and solve safety problem, simulation technology is the key basis, since no safety experiment can be allowed in real factory. However, the exact quantitative mathematic model of chemical factory is too large and complicated to be created and calculated. On the contrary, qualitative simulation can be relative easily to model and quickly to calculate. A qualitative simulation method is proposed based on signed directed graph (SDG). It can effectively present cause and effect relationship between components in complex system. By iteration and expert rules, SDG model can efficiently find out potential hazard hidden in system. Inspired by the mechanism of most popular PHA method, e.g. Hazard ＆ Operability Study (HAZOP), a SDG-HAZOP method is recommended to substitute for manual hazard analysis. A 65t/h boiler’s example is provided to demonstrate this novel hazard analysis method, and its advantages and disadvantages are also discussed.
Research on Object-oriented Petri Net Modeling and It’s Application inShipborne Gun Weapon System LIU Zhou, ZHU Qi-dan, ZHU Wei, AN Xiao-dong The OOPN modeling method in the shipborne gun weapon system is studied and we have made some improvement to this method to simplify the research’s complexity of the system. Shipborne gun weapon system is a complex and large-scale system, which is subsequent interactive and distributed. Therefore, we apply OOPN method to model it. In the modeling, we construct objects by layer, according to the system’s character. Through the modeling, we can see that this method can reduce the scale and complexity of large-scale system, effectively.
Simulation Creditability Analysis of the Missile Impact Point Basedon Information Likelihood Rate ZHANG Xiang-ping, HE Han-gen, XIE Hong-wei, HU De-wen A definition of simulation creditability of the missile impact point is given in theory. A calculation formula of simulation creditability has been deduced by used Bayesian method and a few of key problems about calculating simulation creditability have been solved by using the concept of information likelihood rate. The relationship between simulation creditability and simulation cost has been analyzed and a valuable result has been obtained, that is, their relationship can been approximately described by sigmoid function.
Improvement of 2-D Maximum Entropy Threshold AlgorithmBased on Optimal Entropy Function YANG Shu, GAO Li-qun , BIAN Li-ying According to the property that the equivalent probability distributing has maximum entropy to get image threshold, this paper proposes an automatic threshing of two-dimensional maximum entropy approach, which optimizes entropy function of 2-D maximum entropy threshold by using subtraction instead of logarithm and multiplication. This approach gets the same result of image segmentation as 2-D maximum entropy threshold does and the computational time decreases at least by 15% on average. These results are proved theoretically and verified practically in a lot of footprint image segmentation experiments. This method of threshold automatic selection gets the same result of image segmentation as 2-D maximum entropy threshold does, but at a faster speed, therefore will find a wide application in footprint image segmentation.
VORONOI Diagram Based Spatial Mission Planning for UAVs YE Yuan-yuan, MIN Chun-ping，SHEN Lin-cheng, CHANG Wen-sen Mission planning systems play important roles in autonomous intelligent control and mission capability of UAV. On the basis of analyzing VORONOI Diagrams’ attributes, a VORONOI-Diagram-based mission planning approach for UAVs is studied. Under the scenario of Suppression of Enemy Air Defense, we focus on the planning environments modeling, flight path cost computing and initial cooperating paths selecting. Using this method the planning space dimensions of UAV can be reduced. Also this approach enables multiple UAVs to find spatial cooperating paths much easier. Finally, the analysis of temporal and spatial performance is discussed.
The dynamics simulation of rotating rod string in well bore Liu Ju-bao, Luo Min, ZHANG Wei The slim rod string in well bore is a special structure of petroleum engineering. The dynamics model of rotating rod string is presented, with the consideration of the impact contact between rotating rod string and well bore which happened in any direction of well depth and well bore circumference. The simulation is carried out using dynamic gap element, space beam element and Newmark method. Applied to the B3-4-P31 well etc., it has been shown that the rod string design and the centralizer mount position to be used simulation can safely run in well down and prevent the rod string from failure. This method has been used in Daqing oil field, and can be widely used in other oil field.
LS-SVM-based Control Model of Fuel Cell LI Xi, CAO Guang-yi, ZHU Xin-Jian, MIAO Qing According to the drawbacks of the models existed which are too complicated, a nonlinear model based on Least Squares Support Vector Machines (LS-SVM) is presented for a family of complex systems with strong nonlinearity such as DMFC. The nonlinear offline model is built by LS-SVM with RBF kernel. The results of simulation demonstrate the effectiveness and advantage of this approach. It is applicable for studying model and controlling of DMFC control system.
Infrared Targets Recognition AlgorithmBased on Discrete Cosine Transformation FENG Chun-huan, TU Jian-ping, GUO Jian The discrete-cosine-transformation-based features of infrared targets are proposed, and the invariant features to translation, rotation, and scale change of targets are taken by discrete cosine transformation descriptors. The BP neural network is trained using the invariant features taken, and then recognition ability of the network is tested. Feature describing ability of the discrete cosine transformation descriptor is compared with the Fourier descriptor through recognizing three sorts of targets images in different poses by BP network trained. Recognition result shows that quantity computed and time expended are reduced obviously using the discrete cosine transformation based algorithm in the same recognition rate compared with the Fourier descriptors.
Optimization of MEO Regional Communication Satellite Constellationwith Genetic Algorithm LI Su-dan, ZHU Jiang, LI Guang-xia Study of regional communication satellite constellation is of great use. A MEO constellation for regional communication based on genetic algorithm is proposed. First the orbit control parameters for MEO communication constellation are analyzed and determined; then the evaluation criterions for constellation coverage are discussed; after coding the constellation orbit control parameter set into binary cluster, the genetic algorithm can be applied to achieve the constellation with best coverage to service region. To validate this method, an experiment specified with an area in China and with the criterion of max-proportion of coverage is practiced; the result of this experiment indicates the proposed methodcan obtain the constellation with perfect performance with given condition.
Enhancement of Image Based on Otsu and Modified PCNN LI Guo-you, LI Hui-guang, WU Ti-hua The arithmetic of automatic image enhancement based on PCNN, Otsu and Fuzzy sets was proposed. The arithmetic can not only remove noises effectively, but also automatically select the best threshold based on the image gray characteristic. In additional, fuzzy enhancement of image is realized by using fuzzy algorithm. Consequently, the remarkable effect of image enhancement is gained.
Fuzzy Weighted Linear Regression on Zero Failure Exponent Distribution LI Zheng, SONG Bao-wei, MAO Zhao-yong Parameter estimation is very important for reliability estimation of zero failure data. For the question of poor stabilization in conventional Linear Regression equation, it is usually improved by a weighted coefficient. The fuzzy weight is put forward and for exponent distribution, estimated equation of failure rate is given. Due to the fact that failure probability has large effect for the estimated value, the Bayes estimation is given which bases on decrease function. The fuzzy weighted linear regression model can get low departure. The regression result shows that the new method is more approach to the engineering practice.
Matched Field Inversion via Hybrid Simulated Annealing-Differential Evolution Algorithm ZOU Shi-xin, MA Yuan-liang, YANG Kun-de, ZHANG Yi-peng A hybrid optimization algorithm that combines advantages of two global optimization algorithms (simulated annealing algorithm and differential evolution algorithm) is developed and applied to the problem of determining seabed properties by minimizing the mismatch between measured and modeled acoustic fields, since there are a lot of problems in both of the algorithms. In the proposed hybrid SADE algorithm the population of DE is perturbed by SA, while the parallel property of DE is preserved. The Metropolis algorithm of SA is introduced into DE, which intensifies its ability to escape from local minima. Furthermore, the use of gradient information of DE can improve the search of parameter space more efficiently. Examples based on synthetic data show that the proposed hybrid algorithm works well.
Solution of Traffic Equilibrium Status with Neural Network DONG Jing-xin, WU Jian-ping It is aimed to construct neural network model to assign flow links under user equilibrium of transportation network. Previous analytical method of traffic assignment under traffic equilibrium status are reviewed, and a method using neural network to simulate traffic equilibrium status is put forward. So the new methods can substitute for traditional method, and quickly finish traffic assignment. It is defined the concept of traffic equilibriums function and traffic equilibriums status, and strict mathematical proof indicates that we can recognize the equilibrium status of traffic flows by neutral network. The principle and method on how to construct, train and evaluate a neural network are also presented. At last, with an example the author explains how to use the algorithm, and to evaluate accuracy and CPU time consuming of the algorithm .
Landing Predicting System for Ship-Board Helicopter in Waves ZHOU Bo, SHI Ai-guo, WAN Lin, CAI feng Using the new technology to predict the touchdown occasion, the ship-borne helicopter undertaking the task of salvage and supply, can land safely in waves. The thin-film tilt sensor and ACL－8112PG data collection card is used for ship motion measurement and analog/digital transform. The software package logs the motion data from the measurement system, runs the predictor, displays actual and predicted motions on line. The algorithm can prolong the look-ahead time horizons. An assess method is provided to assess whether this technique can be used to improve safety on operations which are restricted by limits on both of three channels of roll, pitch and heave. The system can generate waves and ship motion experiences automatically. It’s a simulation platform for the safety research of ship-borne helicopter’s landing.
An in-depth Study on XRTI: A Core Software of Distributed InteractiveSimulation Systems ZHANG Xin-ming, XUE Xiao-ming, XIONG Guang-ze The publishing of XRTI, an open resource of NPS, provides an opportunity for unveiling inner implementation of the core software of distributed interactive simulation systems. Based on in-depth analysis on source code of XRTI, implementation details of the primary components in XRTI and complete relations among them were presented. And through a study on the special messages flow, inner structure of XRTI and its working principles were shown clearly to readers. So, this research can provide supports for further development and application of the XRTI software.
Design and Implementation of Computer Simulator Generation Tool—SIMS WANG Lei, WANG Xu, LI Wei The current techniques of simulator fast generation are introduced, the method based on architecture model and unit generation technique is presented. Then a set of instruction describe language is defined, which can generate relevant units. A Computer Simulator Generation Tool (SIMS) that can support different computer architectures is designed and implemented. At last, MIIS and PSE that are developed by SIMS are introduced.
Break of Deadlock in Time Management of HLA HU Yi-na, HOU Chao-zhen, TANG Jing-qiao Time management is an important component of High Level Architecture, while inconsiderate time advance mechanism and unreasonable algorithm can result in a deadlock so that the whole federation can not be able to advance any more. We analyse the reason of appearing deadlock, correct the shortcoming resulted in the Frederick algorithm, provide an improved Stature-Measuring algorithm, and prove that this algorithm will not result in deadlock problem. Conservative and optimistic time advance mechanism should be used actively when designing a federation, and improved Stature-Measuring algorithm should be used when calculating the GALT of conservative federates. So the deadlock problem can be avoided effectively in the processing of simulation.
Autonomous Obstacle Avoidance of Biomimetic RobotFish Based on Infrared Sensor SANG Hai-quan, WANG Shuo, TAN Min, ZHANG Zhi-gang It is presented the design and realization of a kind of biomimetic robotfish with the ability of avoiding obstacles. According to the requirement of obstacle avoidance task, eight kinds of basic motions are designed. An intelligent control method based on multiple infrared sensors is proposed to solve the problem of avoiding obstacles. The experimental results have shown the validity of this method.
Simulation Model of Topology Generation in Hierarchical DistributedAd Hoc Networks YANG Pan-long, TIAN Chang Topology generation model is a very important factor in Hierarchical Distributed ad hoc network simulation architecture. Due to the hierarchical network organization and group mobility, ad hoc network performance varied with the changes in network environment. We analyzed the deployment of the radio set in US army 21st century troops, and set up a simulation model of topology generation. Different topology patterns with same characteristics are generated, and there are significant difference in network performance between random deployed network and hierarchical distributed network. Simulation results show that, simulation model of topology generation is very suitable for hierarchical distributed ad hoc networks, and has same characteristics with real deployment of the 21st century troops.
Test and Evaluation for Weapon Systems Virtual PrototypesBased on Meta-Synthesis DU Xiang-yu, QIU Xiao-gang, DUAN Hong, HUANG Ke-di Meta-Synthesis is a methodology to solve complex problems. In order to deal with the problems in Test and Evaluation of Virtual Prototypes (VPT&E), which is a multi-level, man-in-the-loop, and dense-knowledge complex system, the process model based on meta-synthesis is proposed. With the idea of Hall for Workshop of Meta-Synthesis Engineering (HWME) and Agent technology, the overall framework is designed for the VPT&E meta-Synthesis system.
Web Services based Virtual Antique Museum Architecture BAO Hong, LIU Hong-zhe The heterogeneity nature of the distributed local digital museums prevents their connectivity, and limits their advantage. Web Services extended the integration technology to the web and is the current best technology for web based integration. Ontology based data model is the basis of semantic query. How to build a virtual antique museum using above technologies is discussed and designed. Finally, performance test result and evaluation is provided.
Application of Virtual Reality Technology in Simulation Training ofTransportation and Storage of Oil and Gas REN Wei-jian, ZHANG Zheng-hui, DONG Hong-li, WANG Ai-jun The database hierarchy structures of three-dimensional models of the process of transportation and storage of oil and gas were constructed using MultiGen Creator. The technique of Group LOD and Vsimplify bound to Creator, brief Garland algorithm and triangle algorithm were adopted to optimize the models; therefore the problems of low man-machine interaction speed due to large model volume were solved. The model pickup technique was used to enhance the interaction speed and to make the simulation training more lively. By the simulation training system, operators can observe the process of transportation and storage of oil and gas from arbitrary distance and angle through the terminal and can also observe the inner structures and dynamic operations of the equipments.
Study and Design of Object-oriented Strategy Situation System of Representation XUE Bao-yi, ZHANG Yu, LIANG Dong, HU Xiao-feng Research and design idea of an object-oriented strategy situation representation system is given. According to this idea, first, we made system analysis based on UML criterion, creating the system roles and use cases. Next, we packed situation elements into situation objects and constructed situation object classes and situation representation classes. Then, we worked out an effective and extendable database in the object-oriented pointview. Last, we made system frame design based on object-orientd way and UML criterion.
PID Controller with Neural Nets Optimizing Parameters and Its Stimulation NIU Jian-jun, WU Wei, CHEN Guo-ding  A new algorithm is put forward, in which parameters of the PID controller are optimized online by BP net based on RBF net identifying the Jacobian matrix of the controlled plant. The programming steps under MATLAB platform are described. Simulation is carried out to prove that this algorithm is valid and feasible.
Stabilization Problem for a Class of Unobservable Time-Delay systems MI Yang, GUAN Zhi-hong, LI Wen-lin, JING Yuan-wei  A stabilization problem is considered for a class of unobservable time-delay systems. For the time-delay system with incomplete known state, the observer is constructed by using the linear matrix inequality and system transformation technique. And based on the designed observer, the system stability criterion and the control law only including the observe state are given. Because the parameters in the criterion are solved by the linear matrix inequality, but not estimated in the previous, the conservation is reduced in the conclusion. At last, an illustrative example is presented, by using the Matlab software simulation, which shows the effectiveness of the proposed method.
Centralized Track Initiation Method for Dual-Band Infrared SensorMulti-target Tracking System ZHAO Hui, KONG Xiang-wei, WU Xin-jian As the key problem of multiple target tracking, track initiation technology has received extensive attention and study. The track initiation technology in the real radar system has been already very ripe. But as to dual-band infrared sensor tracking system, the assumption that the target detected probability is 1 may not be true, because each infrared sensor of the different bands demonstrate different measuring characteristics to different targets. So we can’t simply use the distributed track initiation technology which is widely used in real radar tracking system without modified. An initiation method is proposed which is suitable for dual-band infrared sensor target tracking system. Theoretic derivation and emulation test has shown that, with light noise and a low detection rate of sensors, this centralized track initiation method performs better than the distributed track initiation method.
Study on Sensor and Actuator Fault Diagnosisfor UAV Control System JIA Cai-juan, ZHU Xiao-ping, ZHOU Zhou The sensor and actuator failure models of UAV control system are built. These models include partial and total failures of sensor and actuator. Based on the models, multiple model adaptive filter is used to detect and to isolate the faults of the sensor and actuator of UAV control system. A simulation example, which includes three sensor faults and two actuator faults of an UAV control system, is given for illustration. It is found that the method can be used to detect such failures accurately and quickly through the simulation.
Study of Energy Complementary Control of Distributed Power GenerationSystem Based on Renewable Energy WANG Jian, KANG Long-yun, CAO Bing-gang The structure of a distributed power generation system based on renewable energy is presented. The energy complementary control principle is introduced for this system. A mathematical model of the systemwas built according to the energy complementary control principle. A vector control method was designed in the system in order to improve the performance of the system. The simulations and experiments on a wind simulator and flywheel based system have verified that proposed energy complementary control can satisfactorily regulate the power of the storage, store and release energy and thus maintain a steady output from the distributed power generation system.
Maneuvering Target Tracking for Distributed Passive Sensor Networkunder Asynchronous Sampling Condition LIU Zong-xiang, XIE Wei-xin, YANG Xuan, HUANG Jing-xiong Aiming at the nature of the distributed passive sensor network, a method for maneuvering target tracking under asynchronous sampling condition is proposed, which tracks maneuvering target using the interacting multiple model probabilistic data association filter (IMMPDAF). To startup IMMPDAF, the batch maximum likelihood (ML) method is introduced to estimate the initial target state. To adapt to asynchronous sampling condition, the computing method for the Markov transition probabilities is put forward. Simulation results show ML-IMMPDAF is effective in a distributed passive sensor network.
Simulation Studies on Adaptive Nonlinear Control of Ship Motion Course DU Jia-lu, GUO Chen, ZHANG Xian-ku The maneuvers of the ship with the characteristics of the rudder are described by the unmatched uncertain nonlinear model with unknown virtual control coefficient. A nonlinear adaptive control algorithm combining adaptive backstepping algorithm with Nussbaum gain technique is proposed for ship course keeping steering without a prior knowledge about virtual control coefficient. By means of Lyapunov function, it is theoretically proven that the proposed controller makes all signals of the resulting closed-loop adaptive system uniformly bounded, and set heading is kept by the actual heading output of the controlled uncertain ship motion nonlinear system. The results of simulation show that the designed controller can be properly adopted to the ship course keeping with good effectiveness.
A Class of Fuzzy Sliding-mode Control Simulationfor Multi-link Robot Manipulators SUN Wei-wei, WU Yu-qiang A new scheme of sliding-mode control system based on fuzzy logic is proposed for multi-joint rigid robot manipulators with uncertainties. By introducing fuzzy logic to the sliding mode control, the control signals could be softened so that the chattering phenomenon in a conventional sliding mode control system was alleviated .The stability of the fuzzy control system and the boundedness of the tracking error and control signals were ensured by Lyapunov method. At last, a two-link robot manipulatorwas stabilized by the design, and the simulation result verifies the validity of the control scheme.
Design and Simulation of Intergrated Control Circuitof Underwater Active Acoustic Detecting Device ZHAO Guo-ku, CHEN He-juan In order to improve the working performance and anti-interference ability of the underwater active acoustic detecting device, CPLD (complex programmable logic device) was used to design the integrated control circuit instead of discrete components. On the Xilinx foundation series 3.1 software platform, the circuit functions and connections were described with VHDL (Very high speed IC Hardware Description Language) by top-down method. The software automatically completed the VHDL resource program analysis, logic synthesis, optimization and device programming, including logic simulation and timing simulation. The results show the integrated control circuit with CPLD performs accurate functions, meeting the requirements of miniaturization, high reliability and low power consumption, and the design efficiency is also improved.
Application of Unscented Kalman Filter in State Estimation for Land Vehicle Navigation System ZHANG Chuan-bin, TIAN Wei-feng, JIN Zhi-hua In a land vehicle navigation system, generally the Extended Kalman Filter (EKF) is as a state estimation method to improve the accuracy of navigation. However, as defects of the EKF in nonlinear estimation, there exists estimated error, which affects the accuracy of the navigation system, when it is adopted in nonlinear estimation of a navigation system. In order to yield the higher accuracy of navigation, a novel method—Unscented Kalman Filter (UKF) was employed in state estimation for a land vehicle navigation system. For a land vehicle DR/GPS navigation system, the EKF and UKF are compared through simulation. Simulation results show that the UKF is superior to the EKF in state estimation for a land vehicle navigation system.
Study on Simulation for Eliminating Payload Oscillation of Overhead Cranes DONG Ming-xiao, ZHENG Kang-ping, ZHANG Ming-qin An overhead crane contains a flexible mechanical structure, so the velocity variations of the traverse trolley and traveling bridge will incite the load oscillation, in addition the raising or lowering motion of the crane will further enhance the complexity of the oscillation. To eliminate the load oscillation of the overhead crane, a new algorithm, which introduces the mini-max optimization method to the controller design, and minimizes the maximum value of the residual vibration energy in the entire range of the uncertain parameters, is proposed, and with this algorithm a mini-max time delay filter controller is accomplished. Simulation results verify that the filter is robust and not sensitive to the variation of system parameters caused by raising and lowering motion, and in the control process no feedback signal is needed, therefore this filter is easy to engineering practice.
Fine Granularity Adaptive Video Coding Algorithm Based on H.264 PU Ju-hua, XIONG Zhang, HOU Ya-rong A fine granular adaptive video coding algorithm is presented based on H.264, which combines such fine granular scalable (FGS) coding methods as matching pursuit and bit-plane, and the results of video residual after matching pursuit are encoded into two layer bit streams. Another point presented here is the two layer inter-prediction mode. All these results are multi-layer FGS video bit streams. The algorithm is flexible for granularity adjustment and adaptive to bandwidth variation, so it is a promising solution to video application over the best-effort internet with heterogeneity and bandwidth variation. The simulation and experiments indicate its performance in video recovery and scalability.
Actions Simulation of Humanoid Head Robot with Mixed Models of Head Mechanism and Face Elastomer MENG Qing-mei, WU Wei-guo, WANG Yu A robot model is created with existing software, which blend head mechanism model and facial elastomeric model. And simulate facial expression and correspond motion of expression and head, satisfied results are obtained. Through simulation, we have validated design of system and theory of facial expression and provided data for humanoid robot to be farther designed and developed.
Study on Simulation-based Exploratory Analysis Method of Information Warfare System of System (SoS) Encounter YANG Jing-yu, SI Guang-ya, HU Xiao-feng Aiming at the requirement of the exploratory analysis and evaluation of the complex warfare, the exploratory analysis and evaluation framework is presented based on the war game and simulation system developing by the NDU of PLA. Based on the framework, the simulation based exploratory analysis method of the information warfare SoS encounter is studied concretely. Exploratory analysis of the complex problem, real-time simulation of the analysis result and Metasynthetic engineering of the simulation output are paid more attention. Finally, simulation application example of TBM SoS attack and defense is introduced to describe the mission simulation constructing process.
Virtual Scene Technology in Condition of Initiative Infrared ZHANG Xiao-chao, LU He-song, WANG Jing-ye Scene simulation in dark condition is one of the key technologies in virtual scene systems. Most modern high-tech weapons are configured with night observe equipment. The visual systems of simulation drilling system and training simulators should conclude scene simulation of night observe