Volume17  Number 11  (2005)

Title Author   Abstract
Dynamic Characteristics Simulation for Spacecraft Docking Five-Freedom Test Table

LAI Yi-nan, ZHAO Yang, TIAN Hao

　

 Building complete and reliable model is the theory foundation for the design of spacecraft docking five-freedom test table. The dynamic model of spacecraft docking test table was studied. The equations with dynamic constrain in contact point and contact force model during the docking process were built, and five-freedom kinematic model of capturing process was built by Newton-Euler method. Dynamics simulation program in capturing stage was written by MATLAB. The simulation provided the results about relative parameters of active and inactive docking test tables, such as the motion range, the motion characteristic and the acting forces etc. All these provided the important design foundation and reference for spacecraft docking five-freedom test tab
Research on Infrared Imaging Model of Land Tank Target XIAO Fu, WU Hui-zhong, XIAO Liang, TANG Yang  Beginning from the basic procedure of infrared imaging, scheme of modeling land tank target for pure computer simulation was proposed. By dividing the complex environment into target and background, the physical model and calculate temperature fields were constructed separately. Taking the interaction of target and background into consideration, model of whole complex scene are gained by ‘stitching’. Then the attenuate factor of atmosphere between scene and infrared sensor was calculated from atmosphere attenuate model. Last, the work characters of infrared imaging system were simulated for generating the final infrared image. The simulation procedure of land tank target infrared imaging system was also given. An economic and rapid way for developing of infrared system and weapon was provided using this system.
Composition-Oriented Business Process Modeling and Exception Processing ZHANG Jing, WANG Hai-yang As a result of the development of information technology, business processes now spanning different departments even different enterprises have become more and more complicated. A formal composition-oriented business process model was proposed. The model used process algebraπ-Calculus as its formal basis and built a complex process by composing simple structured process control modules to reduce the complexity of business process modelling. Verification for its soundness was given. Exception processing logic was separated from normal process control logic and scooping mechanisms were provided to minimize the detrimental effects of unplanned contingencies by ways of composition.
Modeling and Simulation of Antenna of Intersatellite Link YANG Hai-tao, ZHAO Hong-li The theory was combined with engineering practice. The features and key factors of the intersatellite link in satellite communication network were introduced. The model of intersatellite link antenna was discussed in detail. The models of radiation pattern and antenna direction were built. The methods of simulation and analysis in NS were brought forward. The precision of satellite communication network simulation in NS was increased.
Numerical Simulation of Petroleum Components Transportin Unsaturated Zone and Its Application XUE Qiang, LIANG Bing, LIU Jian-jun, LIU Lei The coupled dynamic model of the petroleum pollutant transport and migration in unsaturated zone was established based on the theory of porous media hydrodynamic and solute transport theory. The characteristic finite difference method and implicit pressure explicit saturation method were adopted to discrete the coupled model. The mass distribution of benzene and pentane in water and gas were discussed. The numerical model was utilized to predict the temporal and spatial distribution features of contaminant transportation and transformation in unsaturated soil. Numerical simulation results show the concentration distribution law of benzene is similar to pentane distribution law, the pollution range caused by petroleum pollutant leaching has a trend of increase with time, and the mass distribution of benzene released in the water and soil has larger than the mass distribution of pentane. It provides theory evidence for studying distribution and inclination of organic pollutant transport in subsurface environment, and the technology supporting are provided for petroleum components quality monitoring and groundwater resource exploitation.
Genetic Algorithm for VRP of Non-full Loads with Time Windows SONG Wei-gang, ZHANG Hong-xia, TONG Ling The genetic arithmetic was applied in non-full loaded vehicle scheduling problem with single park and single vehicle type, which has time windows restriction. Aiming at the characteristic that disorders between the groups and orders in the same group of the non-full loaded VRP problem, an effective crossed arithmetic operators was adopted. So it furthest reserved the excellent characteristics of elder, built up the finding best abilities of the arithmetic, it also avoided the premature phenomenon. And the advantage of this arithmetic was proved by the computer imitation to the problems of 8-custom and 13-custom VRP.
Stability Analysis for Special Kind of Pantograph Equation ZHAO Jing-jun, XU Yang, CAO Wan-rong  The stability of a special kind of pantograph equation was studied. A sufficient condition of the asymptotic stability for the system  was proposed through transformation. Furthermore, the variable stepsize was quoted. It is proved that the -stable Runge-Kutta methods with variable stepsize preserve the stability of the equation.
Relative Position and Attitude’s Resolution Modeling and Precision Analyzing for Formation Flying Small-Satellites CHEN Gu-cang, WANG Yuan-qin, WANG Tian-xiang, CHEN Hong

The relative position and attitude measurement for formation flying small-satellites was introduced by using wireless ranging. The mathematic model for the relative position and attitude’s resolution was built through dot evaluation and stochastic filter respectively. The precision of two methods of the resolution was analyzed through simulation. The simulation shows that the measurement precision can be improved by using these two methods synthetically.

A New Dual-Mode Blind Equalization Approach Based on Modified Super-Exponential Iteration Algorithm

 SUN Li-jun, SUN Chao Blind adaptive equalization plays an extremely important role in digital wireless radio communications. Convergence rate and residue mean square error (MSE) are two main parameters in evaluating the performance of blind equalization algorithms. The iteration form of the super-exponential (SEI) algorithm, which was proposed by Shalvi and Weinstein, converges fast, but its residue MSE is large when used for higher-order quadrature amplitude modulation (QAM) signals. A modified algorithm of the SEI (MSEI) was introduced for digital wireless radio channels, and it is capable of correct the phase rotation of the carrier frequency as well as has a fast convergence rate. On this condition, a kind of dual-mode blind equalization method was proposed. At the beginning of the iteration process, the MSEI algorithm was used. When the MSE level was reduced to a certain level, the iteration mode switched to the decision directed (DD) algorithm. This switch method can achieve less residue mean square error for high order QAM signals. The performance of the proposed algorithms is validated by computer simulations.
Research on Algorithm for Real-Time Visual Simulation of Terrain
Based on Mass Spatial Data
ZHOU Hai-dong, LIAO Xue-jun, WANG Rong-feng As the conception of Digital Earth and Digital City was put forward, a system of real-time visual simulation of terrain has been paid more and attention based on mass spatial data. A multi resolution model of spatial data with quad-tree structure was built. The algorithm for loading LOD data based on window-divided and the method of dividing LOD data based on the same spatial size in geography were proposed. They achieved seamless patching in the random direction and resolving capability, and syncretized the method of terrain simplification on view-dependent and hypsography. At the same time, they synthesized all kinds means of pretreating the visible data, and presented the algorithm for updating a jag of data in the visible area. Finally, an archetypal system was exploited, and the rendering speed is about 25 frames per-second on PC.
Multiple Object Parallel Region Growing for Image Segmentation Based on Support Vector Machines HU Zheng-ping, WU Yan, ZHANG Ye

To solve the difficulty of feature selection and region growing rule existing in conventional region growing image segmentation algorithm, a multiple objects parallel growing algorithm based on support vector machines was proposed. Initial seeds in each object were selected by interactive manual operation. At the same time all the pixels near the seed point belonged to the same object. Then the support vector classifier was trained by the training data collected. The region growing rules were established by making use of the support vector classifier. In order to make results independent of processing order and the initial growing seeds, multiple object parallel growing was employed. Experimental results show that this algorithm is feasible and valid, and it performs better than conventional region growing algorithm.

Simplified MIMO-STOBC Downlink Receiver Algorithm and Its Simulation Realization BI Min, SHEN Min The procedure of MIMO-STOBC downlink receiver was deeply studied, and the fundamentals of ML decode were described. After comparing and analyzing some algorithms, utilizing the statistic characteristics and approximate-relation of received signals, considering the realization complexity and computation, utilizing code division , an simplified MIMO-STOBC downlink receiver algorithm with high practical value was proposed. The simulation results prove that the algorithm has excellent performance, especially in high SNR.
Optimization Method of Slab Location Decision Model

Based on Chaos Genetic Algorithm

 LI Yao-hua, XU Le-jiang, HU Guo-fen, WANG Wei, NING Shu-shi Operation flow of slab entering slab-yard was analyzed and a slab location decision optimal model was suggested. The model considered several rules of slab location and pile position selection and was a general optimal operation to a slab lot of entering slab-yard. An adaptive chaos genetic algorithm was used to solve the model. The algorithm used natural number coding method with dynamically adjustment for the probability coefficients of crossover and mutation, and used chaos optimization method as the mutation operator. The simulation with production data shows that the model and algorithm suggested in this paper are feasible.
Fast Reconstruction Algorithm Based on Hermite Interpolation from Modulus Maxima of Wavelet Transform HAN Min, TIAN Lan, ZHAI Guang-tao, CUI Guo-hui The modulus maxima of a signal’s wavelet transform on different levels contain the most important information of the signal, so it is a meaningful work to find out how to reconstruct wavelet coefficients form the modulus maxima. A fast algorithm based on Hermite interpolation polynomial for reconstructing signal from its wavelet transform maxima  was proposed. Numerical experiments show that compared with the classical alternating projection algorithm proposed by S.Mallat, this algorithm is simpler, more efficient, and it can keep high reconstruction signal to noise ratio at the same time. The computing time of this algorithm is more less compared with that of S.Mallat’s, so it is a practical fast reconstruction algorithm.
Simulation Model Base of High/Low Temperature Environmental Simulation System Based on MATLAB

DONG Su-jun, LI Hong-wei, XIONG Wei, WANG Jun

Professional Model Base is the foundation of system simulation study on the interactive and module model-building environment of MATLAB/SIMULINK software. A Model Base of the High/Low Temperature Environmental Simulation System was built for systematic simulation purpose with the individual equipment as basic module, the rationally simplified dynamic model as the foundation, and the MS-Function and masked block as the basic method, simultaneously using the skills of digital integral variable, Memory block, function indicator, global variable and mask interface. The instances given manifest the Model Base is comprehensive, accurate, universal, simple and can be applied to other thermal-dynamic system conveniently.
Design and Implementation of Simulation Engine Based on HLA Federate Template LING Yun-xiang, ZHANG Xiao-lei, LIAO Hu-xiong, GU Xi-rui, QIU Di-shan The core of simulation system is Simulation Engine. The tasks of Simulation Engine are time-advance, scheduling, controlling, recording and situation display. By analyzing the architecture of Simulation Engine, it was viewed as a special federate and composed of the three components: simulation scheduler, simulation controller and data recorder. Detailed analysis design and implement were also given. By applying this engine to some C3I efficiency simulation & evaluation system, combating efficiency simulation can be controlled high-efficiently, flexibly and orderly.

Simulation Training System of General Radar Equipment

and Key Technology

ZHU Yuan-chang, DI Yan-qiang, QUAN Hou-de, FAN Shi-you, SUN Shu-ying  To solve the problems of simulation training system such as simple function, equipment specified, lower developing efficiency and non-stabilized quality, etc., Product Line Software Engineering (PLSE) theory based Simulation Platform concept, Full-task radar simulation training system concept and domain oriented research methodology were put forward. Simulation training system’s model system was established consisting of appearance model, mechanism model, human-computer interaction model, training evaluation model and system structure model, based on which four typical mode of simulation training system were put forward. The key technologies about the development of full-task simulation training system were studied as follow: ① Maintenance case oriented fault modeling, simulation and evaluation method are put forward and realized; ② General design method for real equipment part based interactive device is put forward and realized with USB（Universal Serial Bus）technology; ③ With HLA/RTI(distribute simulation High Level Architecture/Run-Time Infrastructure), the problem of tightly-coupled interaction in simulation training system is resolved; ④ Component software technology based on model specification and software architecture is established, which realized simulation system constructing mode of composing. In the end, a simulation platform for general radar equipment field and one of its products, a virtual full-task simulation training system, were introduced.
Design and Research of Multiple Weapon Platforms Simulation in Sea War LIU Xiong, KANG Feng-ju, TANG Kai, NIE Wei-dong The concept of Cooperative Engagement Capability(CEC) was introduced. According to the principle of CEC, a surface multiple-weapon platforms simulation system was established based on DIS. Some key techniques in the system design such as exoteric system structure, data synchronous fusion and modeling of decision were researched. A simulation example of surface warship formation against submarine was analyzed. Based on the comparison of calculated result between the fleet equipped CEC system and not equipped, the impact of CEC system to the fleet was discussed.
Research and Development of Simulation Control Platform YFK-1 GAO Li’e, KANG Feng-ju, LU Yao, WANG Yan-ka, ZHAO Ning-ning, TONG Ai-li The control equipment for simulation experiment is necessary in Hardware-In-The-Loop Simulation for Autonomous Underwater Vehicle (AUV). The design of the simulation control platform was introduced based on the hardware system of industrial computer with data acquisition card, and developing soft tool (LabVIEW). The control platform could receive the simulation data from real-time simulation computer ADI and drive external device by the interfaces cards such as A/D, D/A, TTL, isolated digital, reflective memory real-time network and so on. It could monitor and display the multi-channel digital and analog signals. The system has the function of controlling, detecting, monitoring and alarming of simulating progress. The C++ source programming can be used by the program call which greatly strengthens the flexibility of instruments.
Design of DIS-based Underwater Acoustic Countermeasure Simulation System

WANG Xin-xiao, HUANG Jian-guo, YAN Wei, HU Fang

The acoustic, tactic, technique performance and campaign process of acoustic warfare participator were researched. An underwater acoustic countermeasure simulation software was founded by using the technique of system simulation, network communication, computer simulation, and virtual reality, and it was based on Distributed Interactive Simulation (DIS). All the models were adequately verified by the technique of Verification, Validation and Accreditation (VV&A). Its most remarkable characteristic of this system is that the model is built based on the depth of the acoustic signal. It can be used in the underwater acoustic countermeasure system for developing, testing, evaluating and improving. It also can be used in the acoustic warfare system to do simulation exercises and therefore it has a good future of application.
Complexity Diagnoses Method and its Application in Water Resources System TONG Chun-sheng, HUANG Qiang, LIU Han The coarseness method based on genetic code  was proposed to avoid excessive coarseness. Combined with Lempel-Ziv calculation method complexity, it was applied to studying runoff series variety real-time tracking and state diagnoses in up-stream of the Yellow River. The result shows natural environment, human activity and space distance are basic factors deciding runoff variety, and especially direct is human activity effect.
Research on Model’s Reuse in HLA Federate GONG Jian-xing, WANG Da, QIU Xiao-gang, HUANG Ke-di In view of model’s reuse, a new federation development mode at the level of the model was brought forward based on the traditional federation development mode at the level of the federate. The traditional federate frame was reformed and the federate’s invariant common part was encapsulated into the federate middleware. So that the model is able to be plug and play in the federate, and moreover, the model’s reuse and interoperability are improved.

Federate-Clone and Branch-Cutting Research in Simulation Based on HLA

MA Min, JIN Shi-yao

The method of using simulation clone technology to examine alternative scenarios concurrently within single simulation was introduced. In order to solve the explosion of quickly increasing branches numbers, Alfa-beta branch-cutting method was proposed, furthermore, the frame base on HLA was designed to implement of branch-cutting and federate clone. Experiments show branch cutting method can accelerate simulation and can be widely used to forecast of military simulations.
Research and Develop HLA Function of Weapon System Integration Simulation Environment WANG Xue-hui, QIAO Hai-quan, HUANG Ke-di High Weapon System Integration Simulation Environment (WISE) is a powerful tool to develop the entity simulation model, but it lacks of support for the federate development. The primary research is to discuss how to integrate WISE into the HLA framework and turn it into a federate development tool according with the HLA specification. In the case of understanding the fundamental modeling theory of the WISE software and the structure of code, the design and development of WISE software with HLA function extension were focused on. At first,  the design blue print in a mass was presented，then  the whole structure of HLA function module, interface methods, federate framework templates construction and code generation process was introduced in detail.

Study on TCP Protocol Improvement in Wireless Network and Network Simulation

DENG Xiao-heng, CHEN Zhi-gang, ZHANG Lian-ming, JIN Ke-yin Network simulation is a very important method in network research. NS2 is an open source code network simulator, which is widely used in network protocol design and validation. An enhanced TCP-based congestion control mechanism was proposed to solve the performance degradation of TCP in wireless network，which is called TCP-Yuelu for short. This mechanism distinguished random error packet loss and network congestion packet loss by measuring and forecasting the packet queue length of bottleneck link, simultaneously used bandwidth measurement results as reference to adjustment of various strategies on sending rate according to the packet loss reasons and modified the window’s additive increase multiplicative decrease rule of TCP. The algorithm in NS2 was extended and validated. A series of simulation experiments have been done and simulation results show that TCP-Yuelu greatly improves the performance and is of good robustness in data transmission in wireless network.

Research on Optimization of Firing Accuracy of GunsBased on Virtual Prototyping Technology

　

 JIA Chang-zhi, WANG Xing-gui, GONG Lie-hang Dynamic model and virtual prototype of guns system during firing were proposed by using ADAMS (Automatic Dynamic Analysis of Mechanical Systems), and relative sensitivity analysis method and GRG (Generalized Reduced Gradient) method were introduced. On the basis of relative sensitivity analysis of effect of structure parameters on initial disturbance, the contrast problem of parameters with different dimension was solved. The conclusion is drawn that right-and-left mass partiality of recoil parts, up-and-down mass partiality of recoil parts, stiffness of elevating mechanisms, trail stiffness and damp of elevating mechanisms have most influence on firing accuracy. Furthermore, five design parameters were optimized to minimum initial disturbance with GRG method, and the results suggest the design of the gun involved in the study should be further improved to raise firing accuracy. Finally, the research direction of next work and the perspective of virtual prototyping technology applied in armament engineering are presented.
Integration and Application of Modeling Tools in Virtual Prototype Collaborative Modeling Environment ZHENG Hong-tao, PENG Xiao-yuan According to the requirement of modeling and simulation tools integration in Virtual Prototype Collaborative Modeling Environment, the application methods of MATLAB were studied and its integration methods were provided in the phases of building and validating simulation models and developing simulation application. Application and integration approach of MATLAB was discussed in detail through a use case in development of a certain type weapon system virtual prototype system.
Modeling and Simulation of Virtual Human’s Walk Action Based on Petri Net LU Xiao-jun, LI Yan, HE Han-gen  A virtual human’s walk action model based on place/transition Petri Net structure is described detailedly. Firstly, spatial and temporal parameters were generated form anthropometric characteristics and locomotion characteristics. Then, detailed human movement was interpolated from experimental data. Simulation structure was constructed on Petri Net, and several typical, periodical walk actions such as linear walk and crawl were realized with the OOP technologies. At last, a case study of virtual walking demonstration was designed and conducted. The results of simulation experiment indicate the effectiveness and usability of the proposed method.
Study on Mapping of Flying Object Trajectoryon Ideal Observation Image Plane WANG Shu-wen , ZHANG Tian-xu The mapping method of flying object trajectory 3D coordinates on 2D observation image was established, mapping simulation was then implemented based on the method, and satisfied simulation result  was obtained. The methods of camera skew angle and location angle in simulation procedure were introduced to simulate the mapping of flying object trajectory more accurately.

Application of Visualization in High Energy Laser System Research

YANG Ping-li, WANG Jian-guo, GAO You-xing  It’s a complex and expensive project to perform the high energy laser system research. As the development of computer, numerical simulation, visualization and virtual reality technology, virtual simulation has become an important means of science research. The application of virtual simulation in research and experiment of high energy laser system is discussed. The basic architecture is described for constructing a virtual simulation environment of high energy laser system. The concept model and configuration model are showed, and its key technology is discussed.
Adaptive Synchronization for Chaotic Systems with Different Structure and Unknown Parameters HUANG Wei, ZHANG Hua-guang, WANG Zhi-liang  The problem of adaptive synchronization for a class of chaotic systems with different structure and unknown parameters was studied.  A systematic procedure for design adaptive synchronization controller was developed and the analytical expression of synchronization controller and adaptive law of parameters was given based on Lyaponuv stability theory. This method can realize the global asymptotical synchronization of two chaotic systems if the dimensions of two chaotic systems are equal and the state variables are measurable. The proposed method is simple. The adaptive synchronizations between Lorenz and Lü systems are taken as illustrative example to show the effectiveness of the proposed method.
Study of Design and Simulation of Cross-coupling Tracking Filter for Strapdown Antenna Platform ZHOU Rui-qing, WANG Wei The inertial Line-of-sight (LOS) rate for proportional navigation can be obtained directly with rate gyroscope stabilization platform. But inertial LOS rate of seeker with strapdown stabilization platform need to be obtained by digital computation. At the same time, there are cross-coupling between azimuth channel and elevation channel of angle tracking system because of LOS rotation. And angle tracking system also has parameters coupling with velocity tracking system. For these problems a new design method of cross-coupling tracking filter was proposed. The closed loop simulation was carried out considering information fusion with strapdown stabilization control system and velocity tracking system. The performance of angle tracking system was analyzed systemically. Practical parameters and simulating results were given. Results show that filtering values are consistent with true values both azimuth channel and elevation channel. The method presented is effective for strapdown antenna platform.
Research on Control of Navigation and Obstacle Avoidance for Intelligent Vehicles Based on Programming in Line

CHEN Wu-wei, SUN Hai-tao, JIANG Hao-feng, LI Bi-chun

According to the deficiency of control system of intelligent vehicles, a novel control system based on programming in line was offered. It blended traditional method based on artificial intelligence model with the method based on behavior. The progress of programming in line was depicted in detail. It gathered data fusion, path planning and tracking control. The simulation results show better learning-ability and quicker response with this control system for intelligent vehicles. It also illustrates intelligent vehicles have proper judgment and the ability to accomplish the given mission.
Study on Neural Networks Dynamic Hysteresis Model for Piezoceramic Based on Wiener Model DANG Xuan-ju, TAN Yong-hong2 Hysteresis is commonly caused by the delay of phase which leads to multi-valued relationship in frequency domain. But the phase lag based hysteresis model is mainly applied in approximation of the main loop. The hysteresis is interpreted to be consisted of a phase lag and a dynamic nonlinear. The new hysteresis model is a modifying Wiener model in the model structure. Results of simulation and experiment show that the proposed hysteresis model can be used to describe well the behaviors of multi-valued relationship, dynamic and nonlinear for piezoceramic actuator.
Robust Decision Problems Based on Global Optimization for Uncertain SMDPs LIU Chun, TANG Hao, CHENG Wen-juan The robust decision problems for a class of semi-Markov decision processes (SMCPs) are presented with some uncertain system parameters on which the performance function is dependent. The uncertainty of these parameters will lead to the uncertainty of equivalent infinitesimal generator and also the performance function. Different global optimization methods, such as simulated annealing and filled function approaches, were adopted respectively to derive the optimal robust control policy under the case of dependent parameters. With the application of these global optimization techniques, the obtained simulation results for a numerical example show that an average-cost problem is the limitation of a discounted problem as the discount factor goes to zero.

SimulationStudyon General Fuzzified CMAC Neural Network

SHEN Zhi-peng, GUO Chen

 Aiming at conventional Cerebellar Model Articulation Controller (CMAC) and combining CMAC addressing schemes with fuzzy logic idea, a general fuzzified CMAC(GFAC)  was proposed, in which the fuzzy membership functions were utilized as the receptive field functions. The mapping of receptive field functions, the selection law of membership with its parameters and the learning algorithm were studied.. By using GFAC, the approximation of complex functions can be obtained which is more continuous than using conventional CMAC. The simulation results show that GFAC has good generalization, proper approximate accuracy and capacity to calculate function derivative output.
Information Fusion with Bayesian Networks for Target Recognition GUO Xiao-bin，WANG Zhuang，HU Wei-dong  Information fusion with Bayesian Networks for target recognition has become a focus in recent years. A probabilistic model of information fusion for target recognition under the background of information fusion in Electronic Warfare was introduced, in which the information from radar reconnaissance, communication reconnaissance and infrared photographic reconnaissance were integrated under the principle of homogeneity data first, and the basic structure of Naive Bayes classifier and Augmented Naive Bayes classifier. The experiment result shows that the model could make the recognition more accurate, more reliable and more robust.
Fault Detection for Networked Control Systems with Asynchronous Measurement Delays XIELin-bo, JI Zhi-cheng, FANG Hua-jing  The design of observer-based robust fault detection for discrete-time MIMO (multiple-input multiple-output) systems with different measurement time delays in different signal channels was concerned with. A time-invariant formulation for system fault detection was proposed under the existence of asynchronous measurement signal delays and a state observer was construced based on the time-invariant system as that in LTI (linear time-invariant) systems. The residual generator was derived from the estimation errors and was implemented in frequency domain by multiplying an annihilation weighting matrix selected appropriately. In the simulations, the test rig dynamics of a tilting train control system are considered under the presented fault detection approach, and the simulation results demonstrate the effectiveness of the design method.
De-noising Method Based on Translation Invariant in Friction Welding Tested Signals

ZHANG Shu-yan

 The de-noising method based on translation invariant performs the cycle-spinning for the signal to be analyzed at first. Secondly, the soft（hard） thresholding is used to de-noise the shifted signal, then one should shift the data of the de-noised signal in reverse. Do this for many times and average results are obtained. This method can get far weaker pseudo-Gibbs phenomena than thresholding based De-Noising using the traditional orthogonal wavelet transform so that it has better approximation to original signal. It is used to de-noise the tested defects signal of friction welding. Simulated experiment shows that this method greatly improves the de-noising effect.

Combat Simulation Based on Agent Organization

HUANG Tian-chen, HAN Jing-cai

 An agent-based simulation takes a bottom-up, synthesis approach to modeling, is used to explore macro phenomena and collective patterns of behaviors arising from micro details and low-level rules, and is an effective analysis tool for complex adaptive systems. The fundamental processes of warfare were viewed as a complex adaptive system; the modeling was taken based on agent organization; and the high-level emergent behaviors was revealed through the low-level interactions of agent organization. Combat systems were simulated through defining of roles, modeling of static structure and dynamic behaviors in combat-agent organization. The research result indicates that an agent-based simulation can help explore the essence of interactions and evolution laws in the combat systems.
Formal Description Specification for Multi-Resolution Modeling (MRM) Based on DEVS Formalism LIU Bao-hong, HUANG Ke-di With the development of distributed interactive simulation, especially as the emergence of HLA, multi-resolution modeling (MRM) becomes one of the key technologies for advanced modeling and simulation. There is little research in the area of the theory of multi-resolution modeling, especially the formal description of MRM.  A new concept named multi-resolution model family (MF) for the description of multi-resolution modeling is presented. A multi-resolution model family is defined as the set of different resolution models of the same entity. The description of MF includes two parts: models of different resolution and their relations. Based on this new concept and DEVS formalism, a new multi-resolution model system specification, named MRMS (Multi-Resolution Model system Specification) is presented. And some important properties of MRMS are proved, especially the closure of MRMS under coupling operation. MRMS provides a foundation and a powerful description tool for the research of MRM. Using this description, the theory and implementation of MRM can be further studied.
Simulation and Implementation of BD-1 Dynamic Navigation Signals ZHANG Gui-hua, SUN Cai-ying With the development of satellite radio navigation systems such as GPS, Glonass, Galileo and Chinese BD-1, various user receivers have found wide application, whose capability consequently attracts more attention. A practical solution to test those equipments was to design a satellite radio navigation signal emulator to simulate the real environment. An introduction of BD-1 Navigation System and the requirement of its dynamic navigation signals was given, followed by the design in detail, computer simulation and system implementation. Both simulations and results show that the method presented to simulate BD-1 signals is practical, which can meet the requirement to test and verify the performance of the user equipments well.
Guidance Design and Simulation for Launching Satellite with Solid Rocket LIU Xin-jian, YUAN Tian-bao The huge market of launching small satellite drives the solid launching vehicle to be researched and explored at home and abroad. Unlike liquid vehicle, the thrust of solid vehicle can not be controlled, and the variation is large because of environment. In addition, the propellant exhausting shut off is adopted to decrease the weight of rocket, and these factors become the main barriers of guidance design for solid launching vehicle. The problem is eliminated by putting forward a new efficient iterative method for the guidance design of solid launching vehicle, takes an example to simulate, and the numerical results show that the guidance design is not only feasible but also stable, and it is useful to launch small satellite for the guidance of solid vehicle.
Parameterization Method and Constraints Transformation Method for RLV Reentry Trajectory Optimization Using Genetic Algorithm CHEN Gang, WAN Zi-ming, XU Min, CHEN Si-lu The craft reentry trajectory optimization is a kind of optimal control problem. The conventional direct and indirect methods are all very sensitive to the initial values that need much experience. Genetic algorithm is robust to initial guess, but it’s a static optimization algorithm and couldn’t be applied to optimal control problem directly. In order to design the chromosome, three parameterization methods were investigated. The constraints transformation method was also a key problem in the trajectory optimization for genetic algorithm to design fitness function. For the minimum control energy reentry trajectory with fixed terminal time, three kinds of parameterized methods and constraints transformation methods were argued in detail. The simulation results indicate the direct discrete method and dynamic penalty function method have good performance.
Oil Buffer Simulation and Testing with Air Accumulator YAO Rong-kang, ZHU Chang-ming, ZHAN Yong-qi, ZOU Qiong Buffer is a device that absorbs or consumes energy. With the development of the high speed elevator, the buffer with small size and short stoke is demanded. The simulation study of oil buffer with air accumulator was conducted, and the solid prototype was made. The testing result shows the buffer character is perfect.  A feasible method for the study of buffer with high speed impact, small size buffer was provided.
Transient Analysis of Single Phase Operation of Three-Phase Induction Motors with SemihexTM Connection DENG Jian-guo, LUO Long-fu, PENG Xiao The transient analysis of single-phase operation of three-phase induction motors with the SemihexTM connection was dealt with. Symmetrical components method was employed in the analysis of the asymmetrical circuit system of the SemihexTM connection, the condition of symmetrical operation was derived and the value of the capacitance was determined. To get the property of transient state, the mathematics model of single-phase operation of three-phase induction motors with the SemihexTM connection in α β coordinate was put forward. The computer emulation program was compiled. The program was applied to emulate transient process of single-phase operation of three-phase induction motors with the SemihexTM connection through the example. Emulating results were also studied here.
Application and Study of Improved Partheno-Genetic Algorithm to Catchment Basin’s 3-D Modeling YANG Wei, HOU Kun, LIN He-ping,YU Fan-hua Catchment basin is quite important in geochemistry and other domains. But it is rather difficult to auto-detect catchment basin based on its traditional definition when it is modelled with computer. So a definition of Catchment Basin based on dot was given, and an improved Partheno-Genetic algorithm was brought forward according to the definition. The algorithm brought “tolerative choice” and other improved method simplified genetic operation and increased the computing efficiency. Diversity of initial population was not necessary any more and “premature convergence” problem was overcome well. This algorithm could work out entire basin in catchment basin’s 3-D modeling, while the hill-climbing algorithm fellinto local minimum. Experiment also testifies the efficiency of this algorithm.
Constructing Circuit Metamodel Using Kriging Interpolation Integrated with Latin Hypercube Sampling Experiment YOU Hai-long, JIA Xin-zhang, ZHANG Xiao-bo, DONG Ping The design and optimization of circuit systems often need the direct and simple relation between the parameters and specifications, that is, the metamodel of circuit. A metamodel of low-power integrated operational amplifier is constructed using the Kriging interpolation combined with Latin hypercube sampling experiment. For the circuit simulation experiment that the output value is definite, Kriging model has better predict ability than the polynomial regression model based on the classic fractional factor design.
Main Stream Temperature Control System in Fossil Fired Power Station Based on Fuzzy Immune PID-Smith Controller YANG Yan-xi, LIU Ding, GAO Yi In order to overcome the large delay and uncertainty of the main stream temperature object in fossil fired power station, a control system based on Fuzzy immune PID-Smith controller is proposed. The simulation experiments have been made. It is validated that the robustness of this control system is superiors to general Smith predicting control system. Owing to the good fitness of this control method, it can be used in large delay industry process of uncertain model and variational parameters.
Research on Initial Alignment of Marine GINS
Based on Optical Calibration System

BIAN Hong-wei, JIN Zhi-hua, MA Heng

 A novel approach was proposed to solve the non-autonomous initial alignment problem of marine gimbal inertial navigation system (INS). Through the analysis of the system observability based on general error model of GINS initial alignment for different kind of measurement, more external altitude measurements can improve the estimation of INS platform misalignments and instrument biases. In order to enhance INS initial alignment performance, an accurate optical calibration system (OCS) adopting two total stations was designed to obtain high accurate external altitude reference for lower dynamic ship. The Kalman filter using external position, velocity and altitude based on OCS, GPS and log integrated with INS was employed to achieve initial alignment of INS. Comparing to the method using external position and velocity, the Monte-Carlo numerical simulations based on experimental data verify that proposed method is capable of providing high performance both in higher accuracy and less alignment time.

The Simulation Analysis of Customer Network Access to MPLS VPN

HUANG Shuang-ming, MA Ming-kai, DAI Hao  The emergence and characters of the Multi-protocol Label Switch Virtual Private Network were introduced, and the basic principle of the customer routing information being differentiated and advertised was described. To study the ways that Customer Network accessing to the MPLS VPN backbone, firstly, the simulation model was built and the network operation in different accessing way was simulated. Then, some statistics of the CPU utilization factors and memory occupancy of the Provider Edge router were received. Lastly, based on the statistics, these accessing ways were analyzed and some conclusions were reached about the advantages and disadvantages of them.
New Multi-class Support Vector Algorithm and Its Application in Fault Diagnosis XU Qi-hua, SHI Jun  Hierarchical support vector machines (H-SVMs) are faster in training and classifying than other usual multi-class SVMs, and therefore they are suitable for on-line fault diagnosis. A new multi-class fault diagnosis algorithm was proposed based on H-SVM. Before SVM training, the training data were first clustered according to their class center Euclid distances in some feature space. The patterns which have close distances were divided into the same sub-classes for training, and this  made the SVMs have better generalization performance and reasonable hierarchical construction. Instead of common C-SVM, ν-SVM was selected as binary classifier, in which the meaning of parameter ν was more obvious and  could be determined more easily. A simulation diagnosis experiment for the gas path components of a turbojet engine is conducted to demonstrate the effect of the algorithm. The simulation results show that the designed H-SVMs can fast diagnose 5 classes of single fault and 8 classes of combination fault for the engine. The fault classifiers have good accuracy and good generalization performance. As an application example, 6 kinds of real fault samples for JT9D engine were also classified correctly using the algorithm.
Study on War Complex System and War Gaming & Simulation HU Xiao-feng, SI Guang-ya, LUO Pi, YANG Jing-yu, ZHANG Ming-zhi, WU Lin  War problem’s research in the information age needs system theory and new methodology of war gaming & simulation. Based on the system complexity theory and characteristics of the information age war, the War Engineering ideology, which takes system theory as its core, uses modern information technology as measure, and faces full war process, was advanced. Moreover, the comprehensive-domain-oriented Virtual Global War Universe was proposed, which could study some issues about war complex system modeling & simulation.
Simulation- based Warfare Analysis Experiment: a Practice of War Engineering Methodology YANG Jing-yu, SI Guang-ya, HU Xiao-feng Guidance with the War Engineering Methodology, based on up-down management and control idea, the Computational Experiments were integrated into decision analysis, and Simulation-based Warfare Analysis Experiment(SWAE) was proposed. The characteristic and process of the SWAE were engaged in research, and the design ideal of the warfare analysis problem space was stressed. Based on the concept, the structure of the warfare analysis simulation integration environment was introduced.
Study on Agent-based Comprehensive-domain War Universe LUO Pi, HU Xiao-feng, SI Guang-ya War gaming and simulation in information age can be not just considered in the firepower attrition, whereas be paid close attention to the model & simulate comprehensively among military, political, economic, social, diplomatic, consensus domain, etc. Therefore, based on the previous researches of war gaming and simulation in information age and war complexity, the agent-based comprehensive-domain war universe with Complex Adaptive System and evolution idea was studied. The connotation, extension, and characteristics of agent-based comprehensive-domain war universe were discussed, and its prototype was designed, which was a milestone of this long-term research plan.
Research on Modeling Method of SoS Combat Simulation Based on Agent ZHANG Ming-zhi, HU Xiao-feng, SI Guang-ya, ZHAO Zhan-long The system of systems(SoS) combat simulation of weapons and equipments facing to the information age war challenges seriously the traditional system simulation modeling method in the complex system modeling perspective. So, it is necessary to study a new method of SoS combat simulation of weapons and equipments based on the complex adaptive system(CAS) theories so as to meet the need of war game and simulation by the information age war. On the basis of analyzing the demand of SoS combat simulation, the following problems were dicussed, the concept, framework and the strategy of SoS combat simulation modeling based on Agent, and the SoS integrity emergent behavior modeling based on Agent. Then, the modeling method of SoS combat simulation was discussed based on Agent, and the entity，s behavior modeling, the interaction modeling and the entity model structure combined with the SoS combat simulation experiments were studied. At last, the ideas and criteria of SoS integrity emergent behavior modeling based on Agent were put forward.
Study and Realization of War Simulation-based Case Teaching System SI Guang-ya, HU Xiao-feng, WU Lin, ZHANG Yu, ZHU Shu-guang  Virtual case teaching or simulation-based case teaching is a new teaching method that is based on war simulation & gaming system. The features of this new teaching method and the requirements to the computer aided system were described. Then, the function and system architecture of the prototype, MVCTS, military virtual case study system were given out. Finally, some key issues of system realization were discussed.
 Design of exploratory analysis framework EAF HU Jian-wen, WU Xi, YANG Jing-yu, HU Xiao-feng, JIANG Ya-qun An EA framework: EAF is presented. Being independent of the selected model, it makes the problem solved more flexiblebly . The EA framework is composed of 3 modules. The first is input modular. It inputs the initiative data and information such as context of problem, exploratory space decision objective etc. The second is control modular which controls exploratory process by static or dynamic mechanics to diminish the exploratory space. The third modular performs synthetic analysis. It collects the results got from the model calculation at first. Then, several analysis methods, such as neural network, variance analysis, OLAP, data mining and so on, are applied to decision support. At last, a tool is designed to aid analyzers to accomplish problem analysis report.
Study on Warfare-Analysis Simulation System Based on HLA PENG Ying-wu, HU Xiao-feng, YANG Jing-yu, REN Jun Aiming at the simulation demand of the Warfare-Analysis Integrated Simulation Environment(WAISE) applied to the war of information age, the components and functions of the Warfare-Analysis Simulation System were discussed based on HLA, and then the data format about simulation input/output and the function of simulation engine was studied. Finally, three run-modes including Single-Replication Simulation, Multiple-Replication Simulation, and Variable-Scenario-Based Multiple-Replication Simulation were brought, and the design’s thought is proved feasible by the test of experiment.