Title

 Author

Abstract

　Simulation Study on the CGF Entities of Tank Element

　HAN Zhi-jun, XU Ke-hu, LI Meng

Tank element CGF entity model is an indispensable part of developing fight simulation systems of army. Starting with building the abstract model of CGF entity’s behavior, it studies CGF tank entity on expression, production and controlling the method of behavior. In analysis the classification of CGF entity model is used in the simulation system of tank element fight. It realizes the formulation method of the general physics behavior especially, including the locomotion, reconnaissance, fire, outside trajectory, and cannon scattering model of CGF tank entity, and studies the method of aggregating entity realization, such as route program, formation changing, firepower employment of the tank element in virtual battle fields. Finally, setting about from artificial intelligence theory, it carries on the theory study at the advanced intelligent behavior simulation method of tank element entity and puts forward corresponding implementation methods, so as to lay the foundation emulation about training simulation system for practicality development in the future.

　A Simulation Research for Chaotic Micro Mixer Based on Lattice Boltzmann Method

　LI Chuang, CHEN Tian-ning

Micro mixer is an important part in bio-microfluidic chips. Since the cross section of the channel is of micrometers scale, the analysis would not get satisfactory result if we use general fluidic FEM. In this paper, a lattice Boltzmann method was used to simulate the characteristics of a micro mixer. Based on the computation of the flow speeds in the chaotic micro mixers with oblique grooves on the floors, the dispersive mixing processes of the trace sample particles in carrier flows were simulated, and the relation between mixing standard deviation and mixing passage length for the sample particles was investigated, which was found consistent with Gauss curve pattern. The simulation results agree well with the experiments data in the literature. Above results show that the lattice Boltzmann method could be used as a powerful tool for the researches of microfluidic mixers and microfluidic chips.

ANN-based Intelligent Simulation on Flow Field

GU Zheng-hua, TANG Hong-wu, GAO Zhu, Li Yun, Xiao Yang

On the basis of Flow Intelligent Model (FIM) conception from Gu Zheng-hua and Tang Hong-wu, penetrating frame-tetrahedron’s wake field was simulated through artificial neural networks method, and a new idea was provided on flow field’s simulation. Through flume experiment with Acoustic Doppler Velocimeter (ADV) system, nine kinds of penetrating frame-tetrahedron’s wake fields on the different conditions were measured as learning and testing samples of penetrating frame-tetrahedron’s FIM. The expression of the wake field’s intelligent model was obtained by training, and its’ simulation result was consonant with prototype. Conclusions illustrate that FIM-based ANN will be prosperous for its’ rapid simulation speed, good extension generalization capability and tolerance, and high precision.

Two Artificial Intelligent Methods Applied in the Identification of Geothermal Heat Pump System

ZHAO Li-li

Artificial Neural Network (ANN) and Genetic Programming (GP) Algorithm were used to identify the geothermal heat pump system (GHPS). Judging from the result data, the average errors of two models obtained by ANN and GP Algorithm respectively are within 7%. So it is feasible for artificial intelligent methods to solve the identification problem of geothermal heat pump system (GHPS). And Genetic Programming (GP) Algorithm has a potential capability to solve the optimal design and control problem in the field of HVAC.

Study on VV&A for Simulation Model of Phased Array Radar

LUO Jia, LI Yong-zhen, WANG Xue-song, ZHOU Ying, XIAO Shun-ping

The validation, verification and accreditation (VV&A) method for simulation model of phased array radar is discussed in this paper. At first, the conception of VV&A is briefly reviewed and the factors that influence the validity of simulation model is analysed. On the basis of the coherent video simulation, the paper studies some methods of verification of the basic model, especially focusing on the verification of power and precision of the radar simulation system. The methods in this paper were testified practically to be available.

A Kane Formulation for the Inverse Dynamic of Stewart Platform Manipulator

ZHANG Guo-wei, SONG Wei-gang

A formulation based on Kane Equation was educed for the dynamic of the Stewart platform manipulator from the kinematics analysis of the model. The velocity and acceleration between platform and driving poles were deduced. The progression of velocity of centroid and angle velocity of platform was looked as the generalized velocities. We obtain compact expression. These expressions should be interesting from a control point of view. In the end, two examples for a test manipulator model were used to simulate the dynamic of the parallel manipulator. Kane approach doesn’t explore the constraint force of joints and the derivatives, so it can be easily implemented by computer.

Simulation and Research of Multiple Parallel Interference Canceller

WU Qi, SHEN Min

Due to comprise of performance and complex, parallel interference canceller (PIC) is one of the most feasible multi-user detection technologies in CDMA system. However, the performance of PIC is easy to suffer from the estimation bias of interference. In order to solve this problem, it is researched and simulated an improved PIC in this paper. The results show that the improved PIC can increase performance and get better BER.

The Orbit Perturbation Calculator Simulation to an Autonomous Orbit Determination for Satellite

XUE Shen-fang, SUN Cai-hong, NING Shu-nian, JIN Sheng-zhen

presents an expanded Kalman Filtering nonspherical perturbation model to an autonomous orbit determination for satellite with large field sensors. In this filtering algorithm, the traditional one-step forecast is modified into one-step elementary forecast and the correction to it. The simulation shows that the precision of the mean square deviations of position and velocity is high. The orbit variation in one day under the nonspherical perturbation is shown and the motion of the orbit plane is computed.

Payload Oscillation Modeling and Error Analysis for Rotary Crane

DONG Ming-xiao, ZHENG Kang-ping, JIANG Hong ,et al

According to the characteristics of payload oscillation on a rotary crane, a polar coordinates system and a non-inertial Cartesian coordinates system were set up. The linear and non-linear models of payload oscillation under the operating conditions of simultaneously traveling, slewing and hoisting or lowering were built based on the general form of Lagrange’s equation. The errors resulting from the linearization process were analyzed quantitatively. The influence rules of dynamic parameters on the oscillation frequency, maximum amplitude and the tilted offset of the oscillation central axis were presented. Therefore the dynamic performance of the system can be described more accurately so as to provide the theoretical basis for the anti-swing control of the rotary crane.

A Model Identification Software Design for Complex Industrial Processes and Its Application

WANG Yue-xuan, HU Xi-xiang, LIU Lian-chen, WU Cheng

An effective model identification software is immediately needed to help to construct dynamic mathematical model in practical industrial processes because it is hard to be constructed from the real time experimental data under the corresponding producing environment. According to the global identification technique based on parametric dispersion and the multi-layer distributed component technique, a model identification software is designed for complex industrial processes with characteristics of open, generalized and component. The detail design scheme and functions are introduced as well. The software is applied to a practical industrial process and the results show that it dramatically improved the efficiency of modeling in industrial process.

Sampling Strategy in the Profile Measurement of Mill Roll

JIA Lei, PEI Ren-qing, YAO Guang-xiao

The profile of mill roll is measured with the error separation technology and uniform sampling method. In this paper, the important sampling strategy in the measurement process is investigated. The strategy includes how to choose the sampling numbers and set the range interval between sensors. Not only is the sampling numbers determined with probability theory, but also the influence of parameter setting in the following filtering process is considered. When determining the range interval between sensors, the effects of it on the spline interpolation and statistical process are also studied. Finally, the optimum sampling strategy is found.

The Multi-stage Blind Phase Estimation Algorithms for High Order QAM Signals and the Simulations of their Performances

XU Hua, GUO Jian-xin, ZHENG Hui

the blind phase estimation algorithms and, especially, the acquisition algorithms for high-order QAM signals are studied and some new multi-stage phase estimation algorithms are presented. Compared with the other ones presented before, they have much better performance with the cost of introducing some delays. And the simulation results show that the multi-stage algorithms with various structures have different performances, so the algorithm should be selected according to the requirements of practical application.

Numerical Simulation of Two-dimensional Metal Cutting Process

XIE Feng, ZHAO Ji-wen, Liu Zheng-shi, ZHANG Chong-gao

Based on the numerical simulation and FEM software, the chip forming and the stress-strain distribution in cutting zone for the two-dimensional metal cutting process have been simulated, and also the shearing angle and the change of cutting force in the beginning of metal cutting process have been calculated. Through experiments, the feasibility of this method is confirmed. This method is new and unique. Its application will be helpful to the analysis of metal cutting principles and to the design of the cutting tool.

Simulation and Evaluation of Phased Array Radar’s Tactical Ballistic Missile Defense Capability

YANG Li-bin, WANG Xue-song, DAN Mei, XIAO Shun-ping

The problem of evaluation of a multi-function phased array radar’s tactical ballistic missile defense (TBMD) capability has been highly concerned for years. The TBMD process, in which a multi-functional phased array radar is involved, is studied by using the technique of modeling and simulation of radar and electronic war (EW) systems. On the basis of simulation models of radar and EW systems, which are constructed at the signal level, simulation software is developed. In typical anti-TBM scenarios under the conditions of stealth targets and electronic countermeasures, simulation experiments are conducted. Simulation results provide effective supports for the evaluation of phased array radar’s TBM defense capabilities.

Simulation Study for the I~V Characteristic of the High Temperature Superconducting Bicrystal dc SQUID

QI Han-hong, TIAN Yong-jun, WANG Tian-sheng, ZHENG Dong-ning

The equations which describe the characteristics of the dc SQUID are concluded according to the equivalent circuit theory of the dc SQUID in this paper. The simulation study for symmetrical high temperature superconducting bicrystal junctions dc SQUID using Matlab software is also carried through. The simulation results indicate that the output voltage of the dc SQUID changes periodically along with the outer flux and the periodical cycle is the flux quantum Φ₀. The simulation study also provides effective reference for deciding the parameters of the fabricated dc SQUID.　

Research on Disc One-cone Bit’s Working Performance Simulation

WANG Guo-rong, LIU Qing-you

Along with the oil prospecting and production, the existent drilling bit (steel and tungsten carbide tooth bit) was not effective in some complicated stratum. In this situation, Southwest Petroleum Institute developed disc one-cone bit. This kind of drilling bit had some excellence performance such as little torsion, high bottom-hole coverage coefficient, long bearing life and so on. And the bit has expansive application foreground in deep drilling. The main content of this paper is the simulate study on its working performance. Under some appropriate supposition, this paper established the simulate model, and developed the simulate software. Compared the result of the simulate model with the experimental data that collected by the Lab. of Drilling Bit in Southwest Petroleum Institute, the model has been validated. With the simulate program, the simulate study on the working performance of disc one-cone bit had been done in different conditions such as different drilling parameters, different bit structure, different rock performance and so on, which was the theoretic reference to the design of disc one-cone bit.　

Dynamic Simulation of High-Speed Tracked Vehicle Suspension System

SHI Li-chen，WANG Liang-xi，ZHANG Bing-zhi

High-speed tracked vehicle suspension system dynamitic response on irregular ground (including obstacle) was concerned in this article. Theory of multibody dynamics was used to setup the motion equation of interaction between vehicle suspension and road surface. And track loop contribution to vehicle dynamic equation were also considered of which track loop was regarded as forces on chassis and road wheels composed of track dynamics force and track loop tension. According program was developed through Matlab/Simulink to solve these mathematical models with animation output on PC. Case analysis proved to be acceptable and show that the model and its method can be used for armored tracked vehicle suspension design and dynamical analysis.　

MATLAB-Based Dynamic Simulation of Tracking Control of Nonholonomic Dynamic Systems

SONG Zuo-shi, YI Jian-qiang, ZHAO Dong-bin, LI Xin-chun

The simulation problem of tracking control of nonholonomic dynamic systems is addressed. The simulation model consists of model module, controller module and connection module connecting model and controller. The three parts are built by using the combination of Simulink and S-function in MATLAB and the connection module exhibited clearly nonholonomic constraint relation which is difficult to handle. The simulation results were given to demonstrate the effectiveness and feasibility of the proposed scheme. The proposed model provides a new approach to simulate the tracking control problem of nonholonomic dynamic systems. It is also helpful to design and optimization of nonholonomic dynamic systems.　

The Research and Realization of a Real-time Management Model of Engineering Flight Simulation

PENG Hua, SHEN Wei-qun, SONG Zi-shan

In the development of a large engineering flight simulator, this paper has built a service-object oriented model of the real-time management system. This model is based on the customer/server model and has been applied to realize rapid constitution of a complex simulation system. In the paper, the structure and functions of the simulator has been introduced. Then the construction of this model has been fully expounded. And the realization of this mode has been described in detail.　

Modeling and Simulation of Torpedo Trajectory Using WISE

NIE Wei-dong, KANG Feng-ju, CHU Yan-jun, GU Hao

Aiming at the disadvantages in developing integrated simulation software using current simulation languages for weapon continuous system, such as long developing period, difficulties to set up standardization and low reusability, this paper discusses the visualized and modularized modeling method provided by WISE (Weapon system Integration Simulation Environment). Using this method, various granularity reusable models are designed and integrated simulation software is generated, which can be run independently without WISE environment. For practice, a torpedo trajectory 3D demo simulation system has been build. And the method has been verified that it is a flexible effective method in designing reusable models.　

An Intrusion Detection System Based on Load Balancing

LI Ren-fa, LI Hong, YU Fei, XU Cheng

The processor's development speed has already fallen behind that of network development. So, at present, how to realize real-time intrusion detection has become a problem which network security is confronting with. By redesigning current IDS's hardware structure and algorithm, this paper presents an intellective load-balancing algorithm based on genetic algorithm on network and establishes a corresponding instruction detection model. In the end of paper, there is an emulation experiment to this improved algorithm. The results of experiment show that improved algorithm can increase the system performance.　

Design and Development of Reusable Dynamic Simulation ModelBase Based on MATLAB

LIU Xing-gang, YUAN Feng-hua, XU Xin-he, et al

The framework of simulation ModelBase is designed in this paper to satisfy the requirements of analyzing the technical and control model of cold rolling process. The function partition and the object-oriented hiberarchy structure of the system are introduced in detail. Based on the MATLAB simulation platform, the reusable technology is applied to construct ModelbBase, and S function blocks are programmed , supported by the DDE of MATLAB, to execute the data exchange between simulation system and the field monitoring platform ONSPPECT. The concrete example is provided at the end of the paper, which can be used for reference by other applications.　

Construction of a New Simulation System Combining Hardware and Software for Underwater Vehicles

KANG Feng-ju, GAO Li-e, YANG Hui-zhen, et al

To satisfy the requirement of high accuracy simulation of complicated control system of underwater vehicle, a new plan of simulation system consists of AD/RTS simulation workstation, triaxiality rotated-table, water pressure simulator and visual simulation workstation was put forward. Furthermore the real-time communication between the three platforms interconnected by reflective memory was realized. Using Simulink combined with C/C+ + programming, modular simulation model of underwater vehicle was built. In the end, the simulation system was tested. The simulation result shows that it completely satisfies the real-time requirement, and it is valuable for the underwater vehicle design and research.　

Data Fusion Managing and Jamming-effect Evaluation System for Tail-end Compound Guidance

PENG Hao, WANG Guo-qing, YANG De-gui, LI Xiang

As for a few typical compound guidance and under given compound rule, it is designed and realized a semi-physical emulate system for evaluating the anti-jamming ability of tail-end compound guidance. The system is based on the data from six tail-end guidance sensor on-earth and the GPS data of target. After coordinate-transition, on-missile fusion, trajectory imitate, we give the result for anti-jamming ability. It provides technique sustain for weapon development.　

A PC-based Simulation Platform for Unmanned Aerial Vehicles (UAVs)

DONG Miao-bo，SUN Zeng-qi

A PC based simulation platform for unmanned aerial vehicles (UAVs) is introduced. The application is constructed using MFC Document-View framework. The componentialized system structure is employed, providing strong flexibility and expansibility. The function and the interface of the application are introduced finally.　

Research on Train Running Line Simulation System

ZHOU Lei, YU Zu-jun, SHI Hong-mei

introduces the whole function and architecture emulate system and describes emulation theory and technique of the whole emulate system, for instance, the traction force, the brake power, the operation emulation of running resistance and the emulation of route graph and material object landscape. It is also represented in detail the simplified process for differential equation of train running in the emulation process while train is in motion, and the way of seeking changeable slope point in the route ramp process emulation. Moreover, it also focuses on presenting the control method adapted the latest multimedia techniques to realize the synchronism of route image in visual landscape emulate process; the technology that realizes smooth-speeded change by inserting frame when the train is in motion slowly.　

Real Time Simulation of SHEV Powertrain System

CHENG Xi-ming, XU Liang-fei, HE Bin, et al

About the powertrain of a series hybrid electric transit bus, one simulation model and its real time methodology were presented. Based on MATLAB/Simulink^®, the dSPACE controller and xPC target were integrated by the CAN technology. The former emulated the system control unit, and the latter personal computer ran the system model. At the same time, another personal computer monitored both of them and logged. On the novel real time platform, the model and its system controller of the SHEV powertrain system were simulated. The results testify that the real time simulation makes the system operation clearer, validates the real time control algorithm, and builds up the quick prototype of the vehicle control unit.　

Research on A Software Architecture Framework for Knowledge Base System

LI Long-shu, NI Zhi-wei, YE Hong

Advanced applications in fields such as expert system, real-time process control, problem solving, machine learning require the construction, efficient access and management of large, shared knowledge bases. Such knowledge bases cannot be built using existed tools such as expert system shells, because these do not scale up, nor can they be built in terms of existing database technology, because such technology does not support the rich representational structure and inference mechanisms required for knowledge-based systems. This paper proposes a generic architecture for a knowledge base management system intended for such applications. The software architecture assumes quotient space structure which analyses identic problems in different granularity space. A new software architecture model for knowledge base system based on quotient space is given. The atomic component, quotient component, connector and configuration are defined. It is described building a knowledge base system framework for agro-meteorology. Some components and a configuration about agro-meteorology are given. All above work sets up basic theory of software architecture for knowledge base system based on quotient space and provides new way for further research.　

A COM-Based Multiple Mobile Robot Simulation System

HU Rong, WANG Shuo, CAO Zhi-Qiang, TAN Min, TU Xu-Yan

A system framework and architecture based on COM technology are presented for multiple mobile robot simulation system. Based on this architecture, a simulation system is designed and realized, in which mobile robot controllers are provided as COM components. COM is a kind of object model released as component unit, which can be reused and can interact with the client in a transparent way. The characteristic of COM corresponds well with the property of distributed system. Multiple mobile robotic simulation system based on COM works well in distributed simulation environment and can be interacted real-time as well, which facilitates the research on multiple mobile robot system.　

Design and Implementation of Multi-resolution Modeling Based on HLA

LIU Bao-hong，HUANG Ke-di

Multi-resolution modeling (MRM) used for connecting models of different resolution is one of the key technologies in HLA-based distributed simulations. In this paper, after introducing some essential concept of MRM, we concentrate on how to design and implement the HLA-based multi-resolution modeling framework (MRMF/HLA). First, the design goal and the scheme are given. Then, we discuss the design of FOM used for MRMF/HLA, the base class for MRM, the class for MRM service in detail. The implementation of MRMF/HLA main functions of is also given. At last, the plan for next step study is proposed. The realization of MRM/HLA makes it possible for the model developers to develop models of multi-resolution in a rapid and standard way. It also exhibits a feasible way of adding some extended common service into RTI.　

Torpedo Weapon System Simulation Environment Design Based  on High Level Architecture

CHI Gang，WANG Shu-zong

Distribute simulation base on High Level Architecture (HLA) is the direction of system simulation development. This paper preliminary researched torpedo weapon system simulation under HLA simulation environmental, came up with basic frame of torpedo weapon system simulation software, and then simulated and analyzed the operational effectiveness of torpedo weapon system under diverse battlefield environment on the foundation of this frame. Finally some conclusions were drawn.　

Research on Implementation Technique of the LAN-based Distributed Real-time Simulation

LI Shao-yan, HUI Tian-shu, CHEN Zong-ji

The real-time characteristic of the LAN-Distributed Real-Time Simulation System (LDRSS) was analyzed in detail. The quantitative analysis of real-time was given and the necessary and sufficient conditions satisfying the real-time requirements were presented. The real-time performance of LDRSS was described by the defined Real-time Simulation Redundancy. The real-time characteristics of general network transfer modes, Broadcast, Unicast and Multicast were contrastively analyzed and Multicast mode was regarded as the best selection for the LDRSS. Finally, the above-mentioned theory of LDRSS was successfully applied to analyze the real-time performance of an aircraft simulation system.　

Force Computation and Rendering Method for Real-time Force Display

WANG Dang-xiao, ZHANG Yu-ru, WANG Yu-hui, et al

This paper discusses force computation and rendering method for simulating contact interaction between handheld tool and static environment. Static object in virtual environment is modeled using triangle mesh, and dynamic tool is modeled using point-based model. Based on principle analysis of the haptic display device, the difficulty of virtual force computation is explained firstly. Then, virtual force computation process are divided into two phases, collision detection and collision response. In first phase, uniformed spatial partition method is used to accelerate collision detection; in second phase, minimal distance iteration method combined neighborhood topology is utilized. Force-rendering method is introduced to achieve the tradeoff between fidelity and stability, and rendering criteria is proposed to meet the requirement for displaying different geometry features on the virtual object. Haptic display platform is constructed using Phantom, and several objects with typical geometry features are selected to evaluate system performance. Good fidelity and stability result indicate the validity of the force computation and rendering method.　

Research on Getting D Navigational Maps of the VR Scene

WANG Jiang-chun, LUO Jian-qiang, ZHANG Shen-sheng

Virtual reality provides a versatile view for us, and it has become a popular interactive way between computer and human. Although a lot of virtual scenic resources can be found in the Internet, it’s a big problem to use these shared resource to create a new virtual world. The lack of a 2D navigational map for path planning is an obstacle, which constricts the selected scope. In this paper, a simulated controller approach, which composes the map with motion traces acquired on tracking moving viewpoints of a simulated user in the virtual scene, is proposed to overcome it.　

An Algorithm of Mapping Additional Scalar Value to Imaged Based Vector Field Visualization

LU Jian-feng, PAN Zhi-geng, ZHANG Ming-min, LIANG Jian-dong

Line Integral Convolution (LIC) method is a powerful technique for representing directional information in vector field visualization. To Display multidimensional information on the output image, some methods such as color mapping and tone mapping are developed to show the direction, orientation and magnitude of the vector field. In this paper, we propose a new method that maps additional scalar values to the local contrast of the output texture.　

Research on the Virtual Prototyping Platform of Hydraulic System

CHEN xin-yuan, ZENG liang-cai, CHEN kui-sheng, ZHOU yun-gen

investigates the feasibility of establishing virtual prototyping platform for hydraulic system design. We develop the platform design software based on SolidEdge, Ansys, Matlab and Access. This software is helpful to choose hydraulic component, create 2D principle drawing and engineering drawing, make 3D models, simulate assembly, and simulate operation and develop 3D virtual product on the internet. The hydraulic application center of Panzhihua Iron and Steel Group has applied the platform design software to the design of piston servo cylinder test system, and the result proves that the platform design software can reduce the cycle time and cost of product development and improve the quality of design.　

A Virtual Collaborative Design Space for Integrated Missile Design

MEI Shan, ZHAO Wen, WANG Wei-ping

The integrated design of missile weapon system is quite complicated, which challenges the sharing and optimization of models and design parameters. This paper first presents the conception of Virtual Collaborative Design Space on the basis of technology of Virtual Prototype and Computer Supported Cooperative Work, then brings forward the architecture of Virtual Collaborative Studio for Integrated Missile Design and Optimization (VCSIMDO), and finally accomplishes a prototype system.　

Simulation Study of Fault Detection and Diagnosis on Three-phase Sine-PWM Inverter

WU Xiao-hua, SHI Zhong-ke

Nonlinear MATLAB simulation model of three-phase sine-PWM inverter was setup. The data matrix made up of the learning samples of the neural network was obtained by simulating the fault types of the switch off of the switches in the inverter. After training the network, the optimum structure and parameters of fault diagnosis system were achieved. The well-designed training set was verified by simulation test. The simulation result proved that the model was correct and the diagnosis method was feasible.　

An Algorithm for Dividing a Polyhedron into Tetrahedrons and Its Application

XIONG Yu-Mei, CHEN Yi-Min, LI Chao

 proposes an algorithm dividing an arbitrary polyhedron into tetrahedrons. Its basic idea is to find a plane and a vertex to construct a simple polyhedron. After removing the simple polyhedron from the original polyhedron, we can obtain a new polyhedron and such simple polyhedron can be divided into tetrahedrons. Above steps are repeated until we finish all of divisions. We give the algorithm’s theoretic base, data type and its implementation, and then discuss its application on collision detection of the robot.　

A Self-learning Traffic Signal Control Approach and Simulation

CHENG Xiang-jun, YANG Zhao-xia

applies fuzzy theory and machine learning in the process of traffic signal control. It provides a fuzzy traffic signal control approach based on genetic algorithms for isolated intersection. Through fuzzy classifying the number of arrived cars, this paper puts decision schemes of signal control in different conditions of cars’ arriving as rule-set into knowledge-database. It applies genetic algorithm to improve the rule-sets in the course of traffic signal controlling. After programming the simulation program of this control approach and simulating, this paper compares the control effect of this new approach with fixed-time control method and actuated control method. The result of simulating illustrates that the effect of the new approach is obviously better than the traditional ones.

Simulation of Fuzzy Optimal Control Strategy on Parallel Hybrid Electrical Vehicle

WANG Qun-jing, Zhao-tao, JIANG Wei-dong,Li-zheng

An Internal Combustion Engine (IC Engine), Battery and Electrical Machine of parallel Hybrid Electrical Vehicle (HEV) are modeled. A comprehensive objective function based on the efficiency of IC Engine as well as the emissions is applied, and the IC Engine working curves are optimized. Based on the battery SOC constraints and the road load conditions (driver’s request), the actual output torque is computed by a fuzzy logical controller. From the results of simulation results compared with Parallel Electrical Assistant Control strategy, this control strategy improves on the comprehensive level between the efficiency and emissions, and the consumption of fuel and emissions are decreased obviously.　

A Real-time Short-term Traffic Flow Adaptive Forecasting Method Based on ARIMA Model

HAN Chao, SONG Su, WANG Cheng-hong

Real-time and accurate short-term traffic flow forecasting has become a critical problem in intelligent transportation systems (ITS). Based on time series analysis method adopting ARIMA(p,d,0) model, a kind of real-time adaptive forecasting method for short-term traffic flow was presented . In this method the recursive forgetting factor least square method (RFFLS) was adopted for parameter estimation. The Astrom forecasting algorithm was used for forecasting, which is based on linear minimum square error of prediction. A lot of real observation data are used for simulation tests and results show that when forgetting factor is decreased, the one-step forecasting performance can be improved. In addition, when this method is respectively applied to the data at the weekday and the weekend, both simulation tests have good forecasting performance, which demonstrates that this method has good adaptability in different traffic flow circumstances.　

Simulation Research of Constrained Implicit Generalized Predictive Control Algorithm with Constrained Input

LI Guo-yong

a simple implicit generalized predictive self--tuning control algorithm based on CARIMA model is presented. It avoids solving Dioaphantine equation on-line. The parameters of the output predictive equation are directly identified by the characteristic of the parallel predictors, and inputs are constrained by focusing on the generalized predictive control and in the whole of prediction horizon and control horizon. When the inputs are constrained, if the quadratic term of manipulative variable of the criterion function is deleted, calculation will be simple. With this understanding, quadratic program is taken as the optimization, which can be simulated by computer. The presented algorithm can get the information about the predictive control and outputs. Then the using of weighted control regulation not only makes full use of the predictive information, but also improves the criterion greatly.　

A Neural Network Method Applied to Multi-target Data Association Processing

LU Hong-liang, LI Wei-ren

From the point of the combination optimization view, a data association model is established under the dense multi-target environments, and then a continuous Hopfield neural network (CHNN) is designed and applied to the processing. The simulation result shows that this algorithm is more effective and efficient compared with the joint probability data association (JPDA) method.　

Experimental Research on Improving Loading Performance by Compounding Feedforward Control

WANG Xin，SUN Li, YAN Jie

 the mechanism of additional torque in the Electro-Hydraulic Servo Loading System (EHSLS) is analyzed, and the mathematic model of EHSLS is also established. The idea using compounding feedforward to constrain the additional torque and improve the system performance is put forward, and some experiments on the equipment are carried out. The results show that it is an effective method to restrain the additional torque and it can expand the bandwidth of the system to 15 Hz (Δφ<10°ΔA<10%).　

Study on a Quasi-Diagonal Recurrent Neural Network and Its Algorithm

LI Hong-ru，WANG Jian-hui，GU Shu-sheng

A structure and training algorithm for quasi-diagonal recurrent neural network(QDRNN) is presented. The QDRNN is similar as diagonal recurrent neural network(DRNN) in the structure, namely, the simple structure of the DRNN is retained to decrease computational requirement, but the connective right between the adjacent recurrent neutrons are increased. The BP training algorithm may be used directly in the QDRNN. Furthermore, the recursive prediction error(RPE) learning algorithm for QDRNN is introduced, whose stability is demonstrated. The theoretical analysis and simulation results show that the QDRNN has better approximate ability than the DRNN, and the computing time is increased slightly. Especially, all training algorithm of DRNN may be utilized in QDRNN only by little transformation.　

An Optimal Route-planning Method for Low Penetration Trajectory Based on Genetic Algorithm

YANG Jian-ying, ZHANG Hai, YIN Jian

Based on the Genetic Algorithm (GA), a direct 3-dimensionnal algorithm is proposed for the low altitude penetration under complex terrain and threat. Optimal trajectories are given by optimizing original code group (chromosome), objective function, and genetic operators such as reproduction, crossover and mutation. We adopted the coordinate direct code design, super gene protect, distribution search and guide variation. Simulation result proved that this method is reasonable, feasible and effective, and has real-time effect.　

Design for Fuzzy Immune Controller Based on Genetic Algorithm

ZHANG Yi, YANG Xiu-xia

The immune feedback mechanism is modeled by fuzzy controller in accordance with fuzzy Lyapunov-based approach. Parameters that control the rapidity and stability of the system response are optimized by using genetic algorithm. The reasonable design of the immune controller is completed. Using this method, a controller for beam-balanced system is designed. Simulation results show that its performance is better than conventional controller and the beam-balanced control system has good robustness.　

Application of Condition Number in Analysis Observability of System

LIU Zhun, CHEN Zhe

By using condition number, a new method to analyze quantificationally the observability of system has been discussed. It overcomes the disadvantage of traditional control theory observability method, which can not analyze observability of system quantificationally. It can not only analyze the observability of the time-invarying system quantificationally, but also by using multiple measurement estimation and building of local observability matrix, it can analyze quantificationally the observability of time-varying system in any time. And two typical examples are given to analyze and calculate.　

Heuristic Algorithm for Shortest Path Problem with Nonlinear Constraints

WANG Ze-yan, DIAO Xing-chun

Multiple constrained quality of service (QoS) routing optimization is one of important problems in current network research. A basic problem in QoS routing is the restricted shortest path problem (RSP), which is known to be non-polynomial (NP). Many heuristic algorithms with polynomial-time and pseudo polynomial-time complexity have been proposed to solve it. However these algorithms only deal with RSP with linear constraint and transform nonlinear constraint such as loss rate to linear constraint when confronting nonlinear constraint, which will increase the complexity of the problem. A new heuristic algorithm with pseudo polynomial-time complexity is proposed to solve RSP with nonlinear constraints (NRSP). The core of this algorithm is that the nonlinear constraints will not be transformed to linear constraints but as examining conditions. At each iteration step, RSP problem with linear constraint will be solved. If the solution does not satisfy nonlinear constraints, a new linear constraint is added to the original RSP problem. The aim of the new linear constraint is to eliminate the selected path, which ensures the algorithm succeeds to find a solution to NRSP once NRSP has a solution.　

Direction of Arrival Estimation for Wideband Sources Based on Time-Frequency Signal Representation

LIU Yun，LI Zhishun

A novel wideband Direction of Arrival estimation method is proposed by exploiting the signals’ different time-frequency signatures. The data vector model is constructed in time-frequency domain by computing the cross Wigner-Ville distribution of the output of the reference sensor and those of other sensors. Accordingly the time-frequency correlation matrix for each source is formed by choosing the t-f points residing on its own auto-term region, separately. Then the traditional subspace based method is applied on this t-f correlation matrix to obtain the DOA estimates of multiple wideband sources. In contrast to the traditional method, the proposed method combines time-frequency analysis into array processing, and the DOA estimating performance is improved due to localizing the source energy while spreading the noise power in the time-frequency domain. Furthermore, the method is robust against noise and has a low computation load in constructing the time-frequency correlation matrix compared to the traditional t-f method. The computer simulation verified the efficiency of the new method.　

JPDA in Multisensor Multitarget Tracking

BA Hong-xin, ZHAO Zong-gu, YANG fei, CAO Lei

The Joint Probabilistic Data Association (JPDA) solves single sensor multitarget tracking in clutter, but it can not be used directly in multisensor multitarget tracking. This paper presents a method to implement multi-sensor multi-target tracking by combining maximum likelihood estimation with JPDA. The maximum likelihood estimation is used to classify the same source observations at one time into the same set, and then JPDA implements multi-target tracking after the position fused. The theory analysis and computer simulation show that this algorithm may achieve multi-sensor multi-target tracking perfectly with low calculation load added and higher precision.　

Design and Research of the Control System for Simulator of Fire Control System in Armed Helicopter

DUAN Hai-bin，WANG Dao-bo，YAO Fang-zai

A three-axis electric-driven simulator was designed for the simulation of Fire-Control System in armed helicopter. The main technological requirements of simulator were introduced firstly, and then the control scheme of this system was put forward. The control software was also discussed in detail. VxD (Virtual ‘Something’ Device) technique was adopted in the real-time software of upper computer. For the communication protocol in this system, double buffer mechanism of both upper computer and lower computer was proposed. The results of hardware-in-the-loop simulation indicate that the whole control system achieves high control precision, whose operation is easy and function is perfect. This simulator has completed many key real-time simulation tasks of Fire-Control Systems for many kinds of armed helicopters, which shows the effectiveness of this new-designed control system.　

Controller Design of Networked Control System Based on GASA

LI Yi, HU Bao-sheng, PENG Qin-ke

A hybrid scheme based on genetic algorithm (GA) and simulated annealing (SA) is proposed in this paper to design remote PID controller in the linear networked control systems (NCSs) with single-packet transmission. This novel hybrid scheme is called GASA.GASA is used to select the best PID gains due to the network-induced delay. In the solution process, GASA executes GA and SA searches sequentially at different temperatures. The initial solutions of SA come from the evolution results of GA, while the solutions obtained by the Metropolis sampling in SA are the initial population of further evolution in GA. Temperature is updated by temperature-lowering operation. The violations of specifications such as percent overshoot and settling time are penalized in the fitness function of GASA. Numerical results on a test system using Profibus-DP network are presented and compared with results of the modified Ziegler-Nichols method. The results show the effectiveness of GASA in designing remote controller for networked control systems without any prior knowledge on network-induced delay.　

RBF Neural Network for Threat Sequencing

WANG Xiang-hua, QIN Zheng, LIU Yu, SHI Zhe-wen

The air combat situation of fighter can be formulated as a vector, an element of which is a decision factor. Properly determining the weights of all factors is crucial for threat assessment. In this paper, radial basis function neural network was employed to approximate the nonlinear complex relationship of all factors. Analytic hierarchy process was used to form initial training patterns. Then an adjustment was given to adjust unreasonable training patterns among them. The resulting training patterns were supplied to RBF neural network. The experimental results show that RBF neural network can successfully approximate the weights of all factors.　

Fault-Tolerant Twice Median Filter of Type Ä for Non-stationary Signals

HU Shao-lin, HUANG Liu-sheng

To design fault-tolerant filters for signal processing is very important in research for reliability and safety of technological processes. In this paper, a new kind of fault-tolerant filter is built for non-stationary process. The doubly sliding median filters and the sliding mean filters are combined to construct this so-called twice-median filter. This new filtering algorithm can be used to filter noise and to extract signals without removing any outliers before. Some theoretical results and simulation show that these new filtering algorithms have the abilities to avoid bad influence from outliers and patchy in sampling time series and to extract signals unfailingly.　

A Novel Blind Watermarking Scheme Using Perceptual Model to Improve Capacity

JIA Wei, ZHANG You-shen, ZHOU Qing-song

Perceptual model has important application in watermarking schemes. It can solve the conflict between imperception and robustness well. But the relationship between perceptual model and watermarking capacity has not been considered enough. In this paper, a novel blind watermarking scheme has been proposed. The watermarking capacity has been obviously increased using perceptual model. The embedded bit number can be decided by calculating the noise threshold of DCT coefficients. The larger the threshold is, the more the embedded bits can be. The relationship among imperception, robustness and capacity can easily be adjusted by using the scheme. The experiment results show that the scheme is rather effective.　

A Study on the System of Decision-making for Vehicle Collision Avoidance Based on Information Fusion

LIAO Chuan-jin，HUANG Xi-yue，CHAI Yi

An algorithm for knowledge acquirement of the collision avoidance system based on dynamic target tracking with the method of multisensor information fusion is presented in this paper, and predicted residual error is introduced to modify the error caused by the unpredicted information that is not represented completely by residual track error. This paper also studies the representation approaches of state information during driving and establishes vehicle-surroundings state feature model to illustrate the variable and dynamic state of running vehicles. Then, a pertinent information fusion method based on fuzzy integral is presented, and it can make a decision for traveling model and realize active safety.　

Research on Train Running Line Simulation System

WANG Gang，ZHAO Hai, WEI Shou-zhi, SU Yu

In the traditional Bayes decision fusion algorithm, fault decision of the fusion system often occurred because of the uncertainty or fixed value of conditional probability density. In this paper, a new improved Bayes fusion model, which introduced non-parameter estimation method into traditional Bayes fusion criterion, was proposed. In the improved model, judgment about the precision of conditional probability density was made after the decision based on Bayes maximum a posteriori criterion in the process of fusion, and conditional probability density was modified by the Parzen window method when the precision was lower than expected value. In the practical application, the method had been successfully applied in the temperature fault diagnosis system of Hydroelectric Simulation System of Jilin Fengman, the performance preceded that of the traditional Bayes criterion, and the correct ratio of diagnosis result had been efficiently improved.　

Building the Dynamic Network of Mass Customization

FAN Shu-Hai, XIAO Tian-Yuan, QIAO Gui-Xiu, et al

Mass Customization is the most advanced production mode. In this mode, the enterprises can get more agility. The key to success is designing a linkage system that can bring together all the modules needed – instantly, costlessly, seamlessly, and frictionlessly. The great linkage system is the Dynamic Network. We can also regard it as an inside-enterprise “Dynamic Alliance”. Therefore, the authors bring forward three production line layouts which probably suit to the dynamic network of mass customization. The three types are the child production lines type, the C-shape lines type and the petal type. Then the authors analyze the nature characteristics of them, the optimization of weak coupling relations. Finally, a dynamic network of petal type is implemented in a QUEST-based simulation system. And the work flow of it is also described here.　

Application and Development of Virtual Human Technology

YE Han-Xiao, WU Hong-Tan

This articles features the current situation and future development of Virtual Human model, analyzes the limited space of computer technology in the data storage from the Virtual Human model process, introduces the increasingly popular technology of network distribution and presents the way out for the bottleneck problem of current digital body model data processing via the application of network distribution.　

Study on Application of Digital Human Model in Simulation of Manned Spacecraft Design Scheme

ZHOU Qian-xiang, JING Zhong-liang, JIANG Shi-zhong

It is very important to find design defects and to improve the system reliability when digital human models based on anthropometric data are applied in simulation of manned spacecraft design scheme. According to related literatures, human modeling methods and their application are analyzed at first. In addition, development situation of human model simulation and a few key technologies are addressed in detail. Finally, some views are put forward for discussion.　

The Layer VSS Control of Cross Beam Experiment System

YU Hong-yun, CHEN Jie, YANG Zhi-yong

The main idea of the layer VSS is that the system is carved up into many subsystems which have few coupling, and then the controller of every subsystem is designed. The cross beam experimental system is an experimental platform developed for the research of control theory. It’s a higher order nonlinear system. The VSS controller of the cross beam system was designed based on the layer VSS control theory. The simulation result shows that the method has good robustness and ability of anti-disturbance.　

Visualization Method Research of Parachute Working Procedure Based on Vega

ZHENG ping-tai，YANG tao，ZHANG xiao-jin，et al

In the simulation of recovering system of space vehicle, the visualization of parachute working procedure is the key of the whole simulation system. In this paper the animation methods used in vega on Windows NT system were analyzed firstly, and some problems encountered in the parachute visualization were researched, and two simulation methods were proposed and compared, lastly an effective resolution was presented.

Simulation Research on a New ABS Control Method

MA Jin, WANG Ji-sen, HE Chang-an

proposes a self-optimizing method to change locking phenomena of automobiles according to the relationship between torque increment of braking and torque increment of friction. The braking torque applied in controlling of the method is composed of the current braking torque, a sinusoidal torque and damping torque. We applied the control policy to single-wheel model. Under the different road conditions, the feasibility and reliability of the control policy were verified in ABS applications by computer simulation.