Title

Author

Abstract

Simulation Analysis for Tasks Schedulability and Resources Access of Task/Resource Graph (II) —A Case Analysis for Procedure of “Patriot” Heading off Warring Targets

QU Song-bai, HAN Tie-jun, QU Ji-shuang

The simulation modeling method by Task/Resource Graph is very advantageous to analyzing complicated discrete real-time systems due to its abundant time attributes, correspondingly, effect on schedulability by its tasks schedule algorithms and resource access control protocols will be very complicated. It is analyzed the tasks schedulability and resource access by a simulation case study. At first, simulation model of “Patriot” missile heading off warring targets is built using Task/Resource Graph. Then the system’s schedulability is analyzed by RM algorithm combining PCP protocol, including single-node analysis, multi-node analysis and end-to-end analysis. While tasks of complicated system executing, preempting, suspending, and resource conflicting always emerge, especially, for the task schedule and resource utilization in the worst instance, the time sequences of complicated cases is validated by simulation analysis. Results of schedulability and simulation analysis exhibit that Task/Resource Graph model is a powerful simulation method for analyzing complicated discrete real-time systems.

The Simulation for Coherent Gauss Random Process with Cubic Power Spectrum

TANG Hai-tao,

WEN Zhao-fang

Establishing math model for power spectrum of clutter stochastic process is the key to influence the final effect in radar echo simulation. By means of making an AR model of the random process, a simulation method for coherent Gauss random process with cubic power spectrum based on modern signal theory is put forward in this paper by using Levis on-Durbin algorithm and MDL rule and compared with existing spectral estimation methods. The simulation results are given at last. Simulating cubic power spectrum clutter can be fulfilled by utilizing the obtaining stochastic sequence.

Transient Simulation of Hydroelectric System Based on Hydro-Mechanical-Electro Detailed Model

GAO Hui-min,

LIU Xian-lin

That the model presicion of hydraulic system and power system is mismatch reasonably and that there is lack of hydro-mechanical-electro model are the main reason which restricts improving and application extending of simulation on hydroelectric system. It is given in this paper the hydro-mechanical-electro detailed models for united simulation of hydraulic system and power system, including auto-modeling model of complex conduit system based on conduit characteristics, general model of cylindrical or throttled or differetial surgetank, nonlinear model of hydroturbine, generator model with damp winding and grid model. The numerical algorithm for resolving electro-mechanical transient of elastic hammer progress and units to grid together is deduced. Simulations of short-circuit transient for single-machine-infinite system with complex conduit system are made and reasonable results confirm the validity of the hydro-mechanical-electro model and the numerical algorithm.

Fuzzy Clustering Based Recognition and Simulation for Dynamic Wave Pattern of Mould Breakout

Wang Wei-yi, Rong Yi-cheng, Gong You-min, Sun Zhuo, Zhang Ming, Geng Hai, FU Zheng-quan

This paper designs a dynamic information analysis and simulation system based on real time data from field in a large steel mill, and develops a software package under Microsoft Windows environment. By use of data measured and collected with thermocouple technique, fuzzy c-means (FCM) clustering has been applied in recognizing dynamic wave pattern of mould breakout. Abandoning the complex logic prediction formula, the method of recognizing wave patter is close to human intuitive recognizing method. The simulation result shows that the FCM clustering method has higher correctness and is more reliable than the traditional logic prediction method.

The Method and Application of Clutter Signal Generation For Active Radar Seeker

LIANG Zhi-heng, JIANG Zhuang-de, ZHANG Xuan

As clutter simulating in laboratory, it needs to generate the clutter signal modulated by immediate or radio frequency signal with high ratio of signal to noise. In the paper, the specific characters of clutter signal generation are discussed, which includes two parts: signal reconstruction and modulation. The procedure of signal reconstruction includes conversion from power spectrum to vector spectrum, randomization of phase, inverse Fourier transform, and then windowing and overlapping the series time domain sequence, which guarantees the average value and variance of random sequence continuously. The method of modulation is digital quadrature modulation (DQM) instead of liner quadrature modulation (LQM). Before DQM, interpolation extension and low-pass filtering are need. By applying these steps, it can refrain the noise resulted by reconstruction and modulation to –60dB to meet the requirement of active radar seeker-in-the-loop simulation.

Kinematic Modeling and Simulation of the AGV with 3 Degrees of Freedom

LI Yan, LIN Ting-qi, GAO Feng

AGV(Automated Guided Vehicle) with two drivable and steerable wheels is a kind of motion platform with 3 degrees of freedom. Since it can run on the planar surface freely and realizes the control of position between orientation independently, it possesses high flexibility and maneuverability. The inverse-kinematics model of the vehicle is investigated and the motion characteristics of this system are analyzed. Finally the simulation of path-tracking motion is given to verify the inverse kinematic model.

Research on Stiff Problems in Dynamic Simulation of Complex Hydraulic System

GAO Qin-he, HUAN Xian-xiang

Modeling problems of hydraulic components are discussed and methods to reduce the stiff problems in dynamic simulation of complex hydraulic system are studied. A lumped parameter model of fluid transmission line is given based on the accurate approximation method of distributed parameter model and Ritz approximation method is used. A sectional flow formula is given to avoid the infinite derivative of conventional orifice flow formula. Iterated method, reduced-order and linearized methods are introduced to solve the stiff problems caused by small volume and small mass of valve joined into system differential equations.

A Maneuvering Target Tracking Algorithm Based on Radar/ Infrared Sensor Neural Network Fusion

WANG Qing, BI Jing

A maneuvering target tracking algorithm based on Radar / Infrared sensor neural network fusion is presented. A neural network with a Kalman filter is characterized with a nonlinear tracking filter, which enables to make fully use of the image-based additional information for maneuvering detection and keeps the simplicity of the algorithm for the part of its computation load is transferred to the neural networks. Simulation results show that the proposed algorithm has significant advantages over the common nonlinear estimation algorithms in tracking applications for its reduction of computation complexities and its improvement of calculation speed.

Branch & Bound Based Solution of MIQP Problem and Its Application

ZHANG Ju, LI Ping, WANG Wan-liang

Branch & Bound (B&B) based solution of Mixed Integer Quadratic Programming (MIQP) problem and its application in the optimal control of a class of hybrid systems are studied in this paper. The procedure of finding the optimal solution of MIQP problem can be represented graphically as the exploration of a binary tree. Two main aspects, which affect the efficiency of the B&B algorithm, are branchrules and tree exploration strategies. By introducing QPmax, which specifies the maximum number of QP problems allowed to be solved during exploration, suboptimal solutions of the MIQP problem can be obtained within a short computation time. An MATLAB program is developed as an MIQP problem solver, and simulations are made when applied to the optimal control of a class of hybrid systems.

Visual Machining Process Simulation Based on Simplified SCS Algorithm

XIE Li-ming, QIU Zhen-yu, ZHANG Yong-gui, ZHANG Li-yuan, CAI Shan-le

It is expounded the advantage of using dynamic CSG models to realize visual machining process simulation on PC platform, and the machining process is abstracted to a process of solid Boolean calculation, which a series of tool bits’ sweeping volumes is subtracted from the roughcast’s volume. It is also introduced in the paper two popular realization methods: image-space and object-space CSG rendering techniques. The advantage of the later is verified. Some basic theory of dynamic CSG rendering based on OpenGL is introduced, the high efficient SCS algorithm is imported, and two key techniques of it are also discussed, i.e. parity check and sequence subtraction. The algorithm is simplified to handle the special situation on machining process simulation.

Realtime Simulation of Rain and Snow Based on Particle System

WANG Run-jie, TIAN Jing-quan, NI Zheng-guo

Simulation of rain and snow will improve the real degree of flight simulator visual scene greatly. Particle system is a powerful way to simulate rain and snow. A realtime algorithm is presented in this paper to simulate them based on analyzing particle system. The basic idea of this algorithm is to distribute all of rain and snow particles ahead of eye point in order to render visual scene in high efficiency with limited particles. By choosing particle model and particle quantity properly, the algorithm produces realistic visual effect and meets the need of the realtime processing of visual scene.

A Splines Method in Refined Grid for Face Moulding

.LIU Bin, GUAN Liang, GUANG Lu-tai

A splines method in refined grid points for face moulding is presented in this paper which can be used in the corner of the eyes and the corner of the mouth that need to know some details. At present, using NURBS(给出全称) surface methods it must be done by two times. Because of the local support of B-spline, the refined grid splines method is simple and easy to carry out by computers.

Research on the Machining Simulation System for Cutting Curved Tooth Bevel Gears on CNC Gear Generator

LI Jian-gang, WU Xu-tang , HE Jing-liang , MAO Shi-min

The process of cutting curved tooth bevel gears is analyzed from the aspect of dimension position of workpiece and cutter, and the primary theory of machining simulation for cutting curved tooth bevel gears on CNC gear generator is educed. Taking AutoCAD as the operating platform, cutter and workpiece of solid database is bulit. Then the movement of CNC is transferred into relative movement between workpiece and cutter, and the cutting process is performed through subtraction boolean operation of workpiece and cutter. A sample of machining simulation result and a practical cutting result are given to verify the correction of simulation system. The simulation system is a visual aided tool in cutting complex curved tooth bevel gears.

The Research on War Game Simulation System of Air Force

LI Qun, YANG Feng, SUN Wei, WANG Wei-ping

This paper discusses the requirements of the war game system of Air Force. The architecture and function of the war game system is proposed. Supported by Sim2000 simulation environment, the prototype is composed of an integrated family of models, scenario editor, weapon information management and battle space situation display and so on.

Force-Feeling Simulation System of Longitudinal Control Based on the Electro-Motive Force Servo

LU Ying, WANG Yong-liang, WANG Zhan-lin, LIANG Jian-min

According to mathematical model of load force, the paper has designed a simulation system of aircraft force-feeling system by the method of electro-motive force servo loading. The simulation results and application in practice show that the system has characteristics of high precision and good speediness. It could be widely applied to control-force load simulation system of flight simulator.

Finite Element Method Used in Virtual Prototyping

XIE Qing-sheng, LI Shao-bo, CHU Jia-liang

This paper first studies the product design technique and its applications based on virtual prototyping, and then gives the parallel product design process and method based on virtual prototyping, and also studies the optimization design based on finite element and reliability design based on stochastic finite element. Finally, it is presented the parallel virtual prototyping method of automobile body design, and an effective example is given.

Research on Application of PDES Strategy in Cold Rolling Dynamic Simulation.

ZHAO Hui-ping, XU Xin-he, ZHANG Ai-min

Parallel discrete event simulation (PDES) strategy is a hotspot in simulation research field. It is one of the most efficient tools to solve the problem of complicated systems and for the interactive management of distributed simulations. Cold rolling dynamic simulation system is a distributed simulation system that is carried out on several computers. This article not only uses PDES strategy when dealing with the management of discrete events and system logic, but also ameliorates and adjusts the PDES strategy in some certain applications, and therefore acquires the prospective control result.

A Test to the Real Time and Throughput Performance of RTI

HUANG Xiao-dong, HE You, JIANG Ben-qing

Real time and throughput are very important performances of RTI. The impacts of such key techniques as architecture, threading model, communications, TM and DDM algorithms to the real time performances of RTI are analyzed, and an approach to test the performances of real time and throughput is presented. According to the data collected from the experiments, the performances of some typical RTIs are compared and analyzed. The result shows that in high speed LAN the simulation cycle of an HLA-based system can reach more than 30Hz, which meets the requirements of most man-in-the-loop simulation systems.

Some Key Techniques Research of Workflow to Support Synchronized Cooperation of Multi-groups

ZHANG Shi-dong, PENG Zhao-hui, YANG Shao-jun, WANG Hai-yang

Recently, more and more attention has been paid to the research of synchronized workflow. But less has been paid to the research of synchronized cooperation simultaneously of multi-groups. The background of this paper is the software development, in which area synchronized cooperation simultaneously of multi-groups happens often. To better support the software development, this paper brings forward four new kinds of group cooperation activity nodes, the corporation organization model and a kind of arithmetic of conflict checking of members of synchronized cooperative multi-groups.Therefore,a workflow management system that contains one or more synchronized cooperation jobs of multi-groups is easy to realize.

Modeling and Simulating on MPLS-Based Internet Traffic Engineering System

ZHAO Shui-ning, SHAO Jun-li

MPLS-TE is a new method to guarantee network QoS, reduce network congestion and improve its effective utility. The paper gives a simple distribution online solution, and describes its frame and procedure by simulation model. The simulation experiment proves that it is simple and can balance network load better than other online solutions under the same condition.The simulation model also shows its feasiblity and effectivity.

Maximum Range Research of Radar Simulation System

YU Ge-yang, SONG Xiao-quan, CAO Ning-sheng, LI Jun

This paper analyzes the important function of radar simulation system range in the jamming effect evaluation tests, introduces the designing principle of maximum range of radar simulation system in jamming test, and figures out test requirement and approach of maximum range based on different jamming test mode. Meanwhile, it also gives a design of transmitter power of radar simulation system when jamming test goes through the changing process of signal-to-jam ratio.

Simulation Analysis on Hierarchical Fusion Architecture for Integrated Navigation System

YI Xiao, HE You, GUAN Xin

The hierarchical fusion architecture is an important mode for multisensor information fusion. This paper tries to apply the architecture to the integrated navigation system, and compares it with the Federated Filtering algorithm. The simulation results on the INS/GPS/Doppler integrated navigation system show that consecutive hierarchical fusion architecture is effective for integrated navigation system and can get better results than that of the Federated Filtering algorithm.

The Application and Key Technologies of FVM in Metal Forging Processes Simulation

SU Dan, ZHOU Fei, PENG Ying-hong, GE Long

The finite volume method (FVM), which is free of rezoning, is applied in the simulation of the metal forging process. In particular, this paper first introduces the governing equations of FVM for metal forging and then discusses the key techniques such as dynamic boundary tracing and the application of friction boundary. In addition, the forging process of one connecting rod is simulated with FVM, with the metal flow process, the distributions of effective strain and temperature during the forging process carefully analyzed. The results indicate that FVM is an especially useful numerical simulation method for the whole multi-stage forging processes.

Vector Modeling and Simulation of the Autonomous Underwater Vehicle in Spatial Motions

PAN Ying, XU De-min

This paper makes a study of the 6 degrees of freedom(6DOF) motions of autonomous underwater vehicles(AUV) ,and employs Newtonian approach and Lagrangian approach to derive the simulation vector model of the 6DOF motions suited for the Simulink . A powerful and transportable simulation model block of the 6DOF motions of AUV is made, which clears up the difficulties of computation, simulation, and display of the coupled nonlinear motion equations, and provides a convenient tool for the research and design of AUV and other high-technology crafts.

Real-Time Simulation of Brushless DC Motor Drive for Electric Vehicle

LU Zi-guang, CHAI Jian-yun, WANG Xiang-heng, QIU A-rui

In order to reduce cost, risk and development time, the real-time simulator of electric vehicle system can be used for concurrent engineering. An implementation of the real-time model of brushless DC motor drive for the electric vehicle based on block-oriented programming tool Simulink is proposed. Also, by using dSPACE environment，the real-time code of controller and inverter-motor-sensor model is directly generated. Having the real-time hardware interface to actual system, the real-time simulation system can be directly connected to actual controller or real inverter-motor-sensor system for hardware-in-the-loop simulation test as well as for rapid control prototyping applications. Experimental results show that there is no remarkable difference between the responses of the real system and the real-time model, so the real-time simulation system can replace the real system in the development and test stages.

A FSM-Based Signaling Scheme Designed for Distributed Switching

YANG Li-bo, YANG Zhen, ZHENG Bao-yu

Based on FSM model, a distributed signaling scheme is designed,which enables multichannel voice communications in a non-central switching system with shared media. It also enables point-to-point and group calling and considers priority. Simulation in TI CCS is done and it can also be embedded in DSP for further use.

Multistation Passive Fusion Tracking Based on Extended Kalman Filter

CHENG Yong-mei, PAN Quan, ZHANG Hong-cai, YE Xi-ning

Multistation passive fusion tracking algorithms is given, based on EKF ( Extended Kalman Filter ) algorithms, and central fusion structure is selected. It can solve observability and nolinear problems of passive tracking system. As an example, the simulation experiment is conducted for the case which consists of three stations. The simulation results show that the tracking performances are satisfactory.

Optimal Path Algorithms Research Based on the GIS Linear Vector Graphics and Simulation Implementation

ZHANG Gui-jun, WU Ti-hua

The paper offers a “Cut Branch Algorithm” for sampling the information of nodes that lie in the GIS linear vector graphics. Usually, it is more effectively for complex network system. On the basis of it, we get the optimal path sequence by applying the Dijkstra algorithm. At last, we develop a simulation software “GISLOOP” that uses VC++6.0 programming language and ESRI’s MapObecjts2 Component as development tools. Depending on this software we analyze the GIS shapefile “road_4m” downloaded from the National Foundation Geographic Information System (NFGIS) and make some approving results.

Simulation of Diesel Engine Driven Generator with Welding Inverter as Load

GAI Zhi-wu, YU Jian-guo, MA Yan, ZHANG Guang jun

The Simulink simulation model of small scale diesel engine driven generator with welding inverter as load is setup, while the welding inverter often suffers short circuit shock. Diesel engine speed is controlled automatically, and generator has AVR. Following result is achieved through simulation: engine speed, engine output mechanical power, exciting voltage, output electrical quantum of generator, and electrical quantum of inverter changing with time. Harmonic analysis, spectrum analysis and Total Harmonic Distortion of output voltage and electromotive force of generator are also achieved. Effect on system electrical quantum is compared when bearing normal load and short circuit. Simulation result is testified through experiment. This simulation model is an effective method for independent or movable power system design and analysis.

Peak-to-Average Power Ratio Reduction Scheme of an OFDM Signal Based on SLM Algorithm

WEI Ke-jun, YI Xiao-xin

SLM algorithm is a method for the reduction of peak-to-average power ratio (PAPR) of OFDM signal without distortion and it is an effective algorithm. However, the side information needed to be sent to receiver when using this algorithm, and only is the side information received accurately, can the receiver demodulate the received signal correctly. Therefore, dealing with the side information is an important sector. In this paper, a new peak-to-average power ratio reduction scheme is presented This scheme can improve the reliability of the side information transmission through special tackling, and the efficiency of OFDM system is preserved At the same time, the PAPR of OFDM signal can be reduced greatly.

Parachute Physical Model and System Simulation Analysis of Parachute Inflation

SU Yuan, DENG Hui

By means of establishing parachute’s flying physical model, four methods ( i.e. tiny segment analysis method, inflating distance method, moment method and simulating canopy shape method ) are adopted to analyze and calculate the variations of canopy shape and the parameters of parachute inflation. The results here are simply analyzed, and the figures of all the results are compared.

Simulation of High Voltage Direct Current Aircraft Electrical Power Generating System Base on MATLAB

GAO Zhao-hui, ZHANG Xiao-bin, WU Xiao-hua

In this paper a new simulation method of high voltage direct current(HVDC)  aircraft electrical power generating system(EPGS) is presented using SIMULINK and PSB, which are two toolboxs supplied by MATLAB. A system model can be establish easily using a synchronous generator model built and packaged by SIMULINK together with PSB. The simulation results indicate that the new method is feasible.

The System Level Simulation Modeling of Third Generation Mobile Communication System

GONG Wen-bin, GAN Zhong-min

System simulation is an efficient technology for system layout. It can offer real and reliable data for system layout through its special way. It can also shorten the period of system development. The paper aims at system simulation modeling methods of third generation mobile communication system. The frame of system simulation, related models and three efficient system simulation flows are presented. And the establishment method of system simulation platform is introduced simply. At last, it is simulated and analyzed the performance of two channel allocation schemes based on system level simulation.

The Simulation Research of Contour Error Control Methods Based on Neural Networks

XIAO Ben-xian, WANG Qun-jing, ANG Wei-bing, LOU Tian-ling

In motion control system, the differences of the dynamic characteristics of each axes are the main reason of the contour error. We can design a feed forward module for each axes to improve the dynamic characteristics and reduce the contour error of the system. Because of the difficulty of getting the high rank differential signals of input, the compound control is hard to realize. To solve this problem we use two different kinds of Neural Networks to identify the contrary control object and use each Neural Networks as feed forward module. We also do some researches on the Genetic Algorithm. By adding BP algorithm into GA(Genetic Algorithm) we have a new algorithm called Hybrid Genetic Algorithm (HGA). It has the advantage of fast convergence and it will not converge at local nadir.

Neural Network Adaptive Control with Smith Predictor for Flow Rate in Networks

SHEN Wei, FENG Rui, SHAO Hui-he

The network time delay has a great adverse effect on the rate-based ABR flow control in ATM networks. Smith predictor is an effective means that overcomes the large time delay. However, it is very sensitive to model error, so it is not satisfactory to use only Smith predictor in real networks which has indeterminacy of the time delay. The paper designs the neural network adaptive controller with Smith predictor for the flow control, which can overcome the adverse effect caused by the time delay and its indeterminacy well. Thus the source rates can respond to the changes of network status rapidly. Compared with PID Smith predictor control, this scheme has much better adaptability and robustness which are applicable to actual networks, and much lower buffer capacity which is necessary for no cell overflow and link bandwidth full utilization.

A New Method for Improving the Angular Velocity Calculation Precision of Gyroscope-Free Strapdown Inertial Navigation System

ZHAO Long, CHEN Zhe

There are many strengths in the gyroscope-free strapdown inertial navigation system because it is gyroscopes- free; the angular velocity, however, is calculated from signals that are sent by accelerometers, and its calculation error is divergent in time. The key technique, therefore, is how to control the divergence of the angular velocity calculation error and improve the calculation precision. To do the latter in nine-accelerometers schemes, a new method is provided, in which the equation of residual errors is firstly obtained by using the redundant information, then the numerical iteration is applied. The method is simpler and more effective than that one, which uses Kalman filtering to correct satellite attitude errors in the real time after a state noise estimation is received. Simulation results show that the angular velocity calculation precision is obviously improved by the new method.

Research on a New Type of Fast All Digital Phase-Locked Loop

SHAN Chang-hong, DENG Guo-yang

A fast all digital phase-locked loop with automatic modulus control is presented. It switches fast pull-in area, slow pull-in area and locking area by using the out signal of phase detector and controls the loop bandwidth by controlling the modulus of digital loop filter automatically. The system can overcome efficiently contradiction between pull-in time and anti-interference property. Its merits are that synchronization setting-up time is short, anti-interference ability is strong, static phase error is small and integration is easy. The work principle and implementation of DPLL is introduced. Its performances are analyzed and verified by simulation.

Multivariable MAC for Thermal Power Unit Load System Based on Hopfield Network

GUO Peng, GUO Jun-jun, WANG Dong-feng, HAN Pu, ZHANG Li-jing

The thermal power unit load system is an object with coupling and constraints. MAC (Model Algorithmic Control) is one kind of predictive control and has a good application in the control of object with inertia and delay. This paper uses the hopfield network to solve the control input of the load system with constraints. Simulating results show that the new method has good robustness and control effect.

The Response Control of Wind-excited tall Building by T-S Fuzzy Controller

ZHANG Xu hong, XU Mei-xian, ZHANG Shan-yuan

This paper studies the vibration control of tall buildings under along wind excitation by T-S fuzzy controller. The building under consideration is a concrete office tower proposed for the city of Melbourne in Australia that is 76-story and 306 meters high. The adopted control scheme consists of an Active Tuned Mass Damper (ATMD) where the control force is achieved by a T-S fuzzy controller. The subtraction clustering method and the hybrid-learning algorithm are adopted to train the structure and parameters of the T-S controller. The training data are the simulation results of a LQG controller. The robustness of the controller has been demonstrated through the variation of building stiffness. The results show a good performance by the T-S controller for all cases tested. Because the online computing time taken by T-S controller is much shorter than by Mamdani fuzzy controller, the T-S controller has no time delay problem.

Using the Difference Between Multiple Estimators’ Outputs to Track Maneuvering Targets and Its Simulations

WANG Tie-jun, WANG Xiao-hu, ZHANG Ming-lian

The key to track maneuvering targets is how to keep good performance while targets maneuver in various ways. The core of tracking maneuvering targets is studied in this paper. The limitations of current statistical method, innovation method, and changing model method are pointed out. A new method of tracking maneuvering targets is proposed. It uses the difference between multi-estimator’s outputs to determine which is the best for output. The results of simulation prove that it can keep good performance while targets maneuver in various ways, and needs only moderate compute load.

Template-Based Representation Model of Constraint Information & Its Application

YU Shi-guang, LIU Xiao-ping, LI Lin, WANG Jun

Engineering constraint information contains abstraction of constraint design process and summarization of design mode. Therefore, it is necessary to present it formally and effectively to improve the efficiency of engineering design. In the view of this point, the paper first classifies engineering design constraints according to their features. On the basis of the classification, without losing general engineering sense, the paper then proposes a constraint information representation model, which, by using a template as medium, combines multiple knowledge representation methods. And the model is applied in the CAD system of die design. As evidence shows, this approach achieves satisfying effects in improving engineering design efficiency, facilitating end users and other respects.

The Research of Synthetic Environment for Distributed Virtual Battlefield

HOU Hong-tao, SHI Feng, ZHU Yi-fan, WANG Wei-ping

Synthetic Environment(SE) is a vital component of the Virtual Battlefield. In this article, we first expatiate the status of research in the area of SE; based on the analysis of Synthetic Environment Data Representation and Interchange Specification(SEDRIS), we have achieved that a normative SE is composed of Based-Environment, Representation- Environment and Exceptional-Environment. A way for generating Synthesis Environment for the Distributed Virtual Battlefield(DVE) is achieved, and an case for this is given.

Designing Simulation Graphic Modeling Environment Based on Microsoft Visio 2002

HUANG Jin-shan, SUI Zhe, JIANG Xue-zhi

It is analyzed in this paper the common requirements of simulation graphic modeling system and put forward a schema to design the simulation graphic modeling system based on Microsoft Visio 2002. Several main problems of this schema are discussed with some resolvents of the difficulties provided. The practice shows this schema is feasible, and it is advantaged than the traditional developing method.

Application of Virtual Reality in Military Affairs

LUAN Xi-dao, XIE Yu-xiang, WU Ling-da, SONG Yu-qiang, NONG Hai-bin

This paper summarizes the current applications of virtual reality in the warfare, introduces some novel applications in the military affairs, and then discusses the influences of this technology on future warfare. At last, it prospects the possible development of virtual reality in the future campaign.