|
Title
|
Author
|
Abstract
|
The
Synthetic Simulation and Representing Verification
System of Sky-Net |
JIN
Shi-Yao, CHENg Zhi-Quan, DANG Gang, LI Hong-Liang, YANG Tao, WU Tong |
The
Sky-Net is a satellite communication network that is configured by
satellite constellations and covers the global earth by interstellar
communication link. The Sky-Net can raise the profile of the push
for many application domains, such as the development of society,
the advancement of technology, and the informational construction
of military. However, the research of the Sky-Net is a challenging
work because of following factors: the mobility of satellites, the
abrupt disconnection of network, the complexity of peripheral plug,
and the synthetic of development. Thereby, the synthetic simulation
method should be taken to verify the following aspects: the total
requirement of the Net-Sky, the design scheme, the key technical signs,
and the condition of development, ultimately a correct feasibility
report can be submitted. The conception of the Sky-Net synthetic simulation
was introduced, the simulation platform was designed, and the Sky-Net
synthetic simulation and representing verification system was implemented.
At last, the capability of the Sky-Net design method was evaluated
by simulation results of test data. |
Dual
Sliding Mode Variable Structure Control Design
for BTT Missile Autopilot
|
TONG
Chun-xia, WANG Zheng-jie, ZHANG Tian-qiao |
Current channel independent STT design method cannot cater for the
requirement of BTT missile design due to coupling between different
channels. A new BTT missile autopilot design method based on variable
structure control theory is presented. The design sets up a combined
state equation for two coupling channels. Adaptive pole configuration
is used for dual sliding mode, which can reduce the switching frequency
of control factors. Approaching method is used for variable control
design. The parameters of approaching function are adjusted timely,
which can reduce the chatter of the slid mode. The method can simplify
variable control and reduced calculate complex. |
Validation
of Simulation Models Based on Grey Relational
Analysis and Improvement |
SUN
Yong-cheng, ZHOU Xian-zhong, LI Gui-fang, JIANG Jing-long |
It is analyzed and compared the features of usual methods for simulation
model validation, presented the use of grey relational analysis method
to validate the reliability of simulation models, and listed the operational
steps in detail. Then it is analyzed the risk contained in this method
and the grey relational analysis model is improved according to the
need of simulation model validation. Finally the rationality of improvement
and decrease of risk are verified with examples. |
| Research
on Hybrid Modeling and Simulation of Brushless DC Motor Based on
System Generator/Simulink |
JI
Zhi-cheng, CHEN Ya-bing, ZHOU Zhi-ping |
System Generator (SG) is efficient high level design tool based on
FPGA. MATLAB/Simulink is one of the most popular simulation tools
to build offline model. Combined with the advantages of the two software,
a novel approach for SG/Simulink hybrid modeling and simulation of
Brushless DC motor (BLDCM) control system is presented. Using the
professional SG tools, the design procedure of the model of BLDCM
control system is illuminated. When the control algorithm is implemented
in an FPGA, SG tools can be used to not only exactly simulate the
hardware but also automatically generate the necessary VHDL codes
of the control model. The reasonability and validity of the hybrid
modeling and simulation method have been testified by the simulation
results. |
| Method
and Simulation of Autonomous Navigation for Satellite by a Combination
Star Sensor with Large View Field and Starlight Refraction |
WANG
Guo-quan, JIN Sheng-zhen, SUN Cai-hong, NING Shu-nian |
A kind of new method of autonomous navigation for satellite with high
precision is given by analyzing factors of affecting navigation precision
based on starlight refraction. That is, the method is that the simultaneity
measurement of the three stars near the earth¡¯s edge by a combination
star sensor with large view field, and direction and position of the
earth's core is accurately determined through geometrical position
among satellite, the earth, star direction and a given model of starlight
refraction through atmosphere to realize high precision autonomous
navigation for satellite. A simulation model of the method is set
up using filtering algorithm of extend Kalman, and the system simulation
is made using simulative data at the basic of a synchronization satellite
of the earth. The simulation results show that the method has much
higher accuracy of navigation. |
| Guidance
Accuracy Study of Anti-Radi Aircraft |
SONG
Long£¬REN Zhang |
We
study the Guidance Accuracy of anti-radi aircraft using simulation
techniques. And a simulation model of guidance system for anti-radi
aircraft based on dynamic simulation software SIMULINK is built. With
the results of simulation, the factors influencing the guidance accuracy
are found. So how to improve the guidance system of anti-radi aircraft
is decided. |
| Method
of Assessing Operational Effectiveness of Space Equipment Architecture
Based on Petri Net |
SHEN
Ru-song, ZHANG Yu-lin |
According to its characteristics, space equipment architecture was
divided into logical architecture which was described by functional
model built by using of colored stochastic Petri net, and physical
architecture which was described by physical model built by using
of queuing theory and space equipment performance models. Taking ballistic
missile attacking moving targets on sea as an example, the operational
effectiveness model of space equipment architecture was built combining
functional model and physical models with space equipment operational
effectiveness models. The simulation results demonstrate that the
model can reflect the effects of space equipment architecture on operation
outcomes and be used to analyze space equipment architecture and its
configuration. |
| A
Study on the Workflow Technique for HLA FEDEP and VV&A |
FANG
Ke, YANG Ming, WANG Zi-cai |
HLA FEDEP and VV&A process are complicated and cost a lot of manpower
and material resources to perform in practical projects. In order
to provide a method to implement FEDEP and VV&A process automation,
the essentials of FEDEP and VV&A process are analyzed, the FlowMark
workflow model is introduced, and the implementations of FEDEP and
VV&A workflow elements are explained. Afterwards, the basic services
and tools required by workflow automation are introduced, the key
techniques of implementing workflow engine are analyzed, and the principle
of realizing FEDEP and VV&A workflow automation and program interface
are introduced. Finally, a conclusion of the study is presented. It
is promising to realize the automation of FEDEP and VV&A processes
effectively by workflow technique. |
| Validation
of a Prototype System for Mixed Traffic Microsimulation |
LI
Qing-feng, WANG Zhao-an, YANG Jian-guo |
In
the development of a prototype system for mixed traffic microsimulation,
lots of field researches are needed, and the validation of the prototype
system is mainly validating traffic participant models. Therefore,
considering these characteristics, a scheme is drawn for the validation
of the prototype system based on the existing simulation validation
schemes. The validation scheme consists of 5 steps: intended uses
determination, referent definition, conceptual model validation, rule
base validation, and results validation. And at the end of the paper,
an example of the application of the proposed validation scheme is
presented. |
| Simulation
Model of PEMFC Temperature Control |
MA
Tian-cai, SUN Ze-chang, XU Shi-chuan |
Based
on the analyzing of thermodynamic feature of proton exchange membrane
fuel cell electrochemical performance as well as its structure, a
thermal system control simulation model is introduced. This model
includes the whole PEMFC engine system, not only a single cell or
a fuel cell stack, and appropriate equations are presented to consider
the varying of thermodynamic energy. The model is tested by using
Matlab/simulink software. Cooperated with practical FCE research working
a feasible modeling method is offered, which needs only the parameters
that can be easily measured, such as temperature, humidity and flux. |
| An
Efficient and Nearly Unbiased Algorithm for Bearings-Only Target Localization
Using Bistatic Sonar |
XU
Ben-lian, DONG Xue-ping, WANG Zhi-quan |
As
we know, the target motion analysis (TMA) is a nonlinear estimation
problem because of the nonlinearity of its measure equation. This
will result in biased or divergent solution according to the pseudo
linear equation derived from measure equation. The authors present
an efficient and nearly unbiased algorithm for bistatic bearings-only
target localization based on measure angles. This proposed algorithm
compared with extended Kalman Filter can achieve the Cramer-Rao Low
Bound (CRLB) efficiently for Gaussian noise around small error region
through simulations in terms of position and velocity root mean square
errors. |
Study
on Algorithm of Threat Level Assessment
Based on Bayesian Network |
YU
Zhou-yi, CHEN Zong-ji, ZHOU Rui |
The
advantage of the expert system based on Bayesian Network is given.
The inference model based on Bayesian Network is discussed and the
algorithm based on the model is presented. The Threat Level Assessment
model is built using this algorithm. Simulation result shows that
the algorithm is effective and is able to reflect the real threat
level. |
Novel
Blind Equalization Algorithm for Multipath Fading
Underwater Acoustic Channel
|
SUN
Li-jun, SUN Chao |
In underwater acoustic digital communications, two main factors which
affect the performance of communication systems seriously are multipath
fading and Doppler frequency shift. A blind equalizer based on fractionally-spaced
decision-feedback structure, which efficiently combats the multipath
fading effects of underwater acoustic channels, is discussed. Towards
the time-varying Doppler underwater acoustic channels, a modified
constant modulus fractionally-spaced decision- feedback equalization
and second-order digital phase-locked loop combined algorithm, which
can efficiently correct the channel-introduced carrier phase rotation,
is proposed. Finally the performance of the proposed algorithm is
compared with a constant modulus baud-spaced decision-feedback blind
equalization algorithm by computer simulation, and the simulation
results confirm the effectiveness of the proposed algorithm. |
| Topology
and Simulation of Complex Spatial Heating Network |
WANG
Xiao-xia, ZOU Ping-hua, ZHOU Zhi-gang |
Based on spatial network, a new calculation method is put forward
for simulating the hydrodynamic course of multi-heat sources and multi-loops
complex heating network. The method can calculate flux assignment
and node pressure of heating network under different conditions by
counting non-linear equation group according to network inherent parameter,
solve the calculation problem of asymmetric network as the result
of fault and remedy the shortcoming of the method for planar network.
The topology of spatial heating network is described with graph theory,
and an applied method for creating relating matrix and basic loop
matrix of spatial network is put forward according to information
of planar network. The correctness and practicability of the method
are validated by an example. |
| Research
on Global Path Planning Method For Autonomous Underwater Vehicle Based
on Large-scale Chart Data |
WANG
Hong-jian, FU Ming-yu, SHI Xiao-cheng, BIAN Xin-qian |
A
global path planning method for autonomous underwater vehicle (AUV)
based on Genetic a1gorithm (GA) and large-scale chart data is studied.
It is introduced the grid-based approach for environment model and
the data structure, in which the nodes of the grid store the digital
elevation property. Some problems such as the coding of chromosome,
generating initial population based on knowledge and evaluation function
of generic algorithm are discussed. At last, it is proposed the design
method for five kinds of generic operators based on domain knowledge.
The simulation result shows that this algorithm, which adopts a method
of variable length codes, makes the path described more simply and
clearly, has the character of high speed global convergence, and can
more efficiently and effectively solve the problem of path planning
for AUV. |
| Research
on Uniform Distributed Parameter Model and Numerical Simulation Method
of One-Dimensional Liquid-Phase Transition System |
CHEN
Hong, HE Zu-wei |
The liquid phase transition system is widely encountered in modern
engineering applications. For the improvement of several primary shortcomings
existed in the dynamic process simulation models of liquid phase transition
system, the uniform distributed parameter model for dynamic process
of one-dimensional liquid-phase transition system has been established.
An analytical-numerical mixed simulation method based on an idea tracing
liquid particle is put forward. Many problems of such a system can
be solved effectively by utilizing this new model, which include the
numerical value stability problem that is difficult to avoid in existing
dynamic simulation models, the simulation module switch frequently
problem, the exactly establishing of the transient position of phase
transition point, etc. Thus, it has been presented an effective methodology
for the modeling and simulating of one-dimensional liquid-phase transition
system. |
Design
WRBF Neural Network and Its Application
in Chaos Time Sequence Prediction |
CHEN
De-bao, ZHAO Chun-xia |
The
Wavelet network has the best character in time domain and frequency
domain, and RBF network has the best local character. With combination
of their merits, a new WRBF (wavelet radial basis function network)
network is designed. It has four layers cells. The input samples are
compressed by the first hidden layer (wavelet layer) and the second
layer operating with the compressed outputs of the first layer. So
the larger number samples that should be used to determine the centers
and the widths of the RBF¡¯s cells was relieved. In order to optimize
structure and parameters of WRBF network, a new adaptive evolutionary
programming with binary and complex¡ªvalued encoding method is proposed.
The information is expanded at large scale with diploid genes, the
convergent speed of the algorithm is fastened and the global optimization
is realized. The effectiveness of the proposed method is proved by
simulation with chaos time sequence based on the research of algorithm. |
| A
Study on Simulation Algorithm and Operation of Automatic Train Operation |
LIU
Hai-dong, MAO Bao-hua, DING Yong1, HO Tin-kin |
It is studied the control algorithms of automatic train operation
(ATO), which concerns many functions during the train¡¯s operation,
such as efficiency, punctuality, energy-economizing, stop precision,
comfort and so on. In addition, energy-economizing arithmetic uses
the control mode which operates according to target speed and makes
the best use of coasting, timing arithmetic uses heuristic arithmetic
that adjusts target speeds. On the other hand, the operating conditions
of the train¡¯s being punctual or behind the schedule are all simulated
on the computer, and the results are compared with those from practical
operation. It is an effective method for further studying of automatic
train operation system. |
| Theory
of Numerical Methods and Efficient Algorithms for Stiff Volterra Functional
Differential Equations |
LI
Shou-fu |
Stability
theory of stiff Volterra functional differential equations(VFDEs)
and B-theory of its numerical methods are presented, which provides
unified theoretical foundation for the study of stiff initial value
problems in delay differential equations, integro-differential equations
and VFDEs of other type which appear in practice, and several classes
of efficient numerical methods for VFDEs are recommended, such as
backward Euler method, BDF method of order 2, parallel multivalue
hybrid methods and multistep Runge-Kutta methods with real eigenvalues. |
| The
GPL-stability of Runge-Kutta Methods for Generalized Delay Differential
System |
CONG
Yu-hao, ZHANG Yuan-ying, XIANG Jia-xiang |
It
is discussed the asymptotic stability analysis of the IRK-method for
the numerical solution of generalized delay differential equations.
The GPL-stability behavior of IRK-method is analyzed for the solutions
of the system of linear test equations. It is shown that the IRK-method
is GPL-stable if and only if it is L-stable. |
Two-Step
Continuity Runge-Kutta Methods of Numerical
Simulation for Singular Delay Differential Equations |
LENG
Xin, LIU De-gui, SONG Xiao-qiu1, CHEN Li-rong |
In
this paper, an idea of relaxing the effect of delay when computing
the Runge-Kutta stages in the current step and a class of two-step
continuity Runge-Kutta methods (TSCRK) of numerical simulation for
singular delay differential equations are presented. The construction,
order conditions and convergence of the methods are studied. Analysis
of numerical stability of methods is given. The two-step continuity
Runge-Kutta methods possess good numerical stability properties and
higher stage-order, and keep the explicit process of computing the
Runge-Kutta stages. The numerical experiments show that the TSCRK
methods are efficient. |
| A
Particle Dynamical Evolutionary Algorithm and Its Application on Solving
Single-Object Problems |
LI
Kang-shun , LI Yuan-xiang, TANG Ming-duan , Zheng bo-jin |
A
particle dynamic evolutionary algorithm is presented based on particle
transportation theory according to the principle of energy minimization
and the law of entropy increasing in phase space of particles, and
in the numerical experiments, we have used this algorithm to solve
the single-object optimization problem (SOP), which the traditional
evolutionary algorithm is difficult to solve. Compared with the traditional
evolutionary algorithm, this algorithm not only can solve linear and
non-linear optimization problems more quickly, but also can more easily
solve the all coordinates reached the global solution of problems. |
Numerical
Dissipativity of Two-stage -method
for Delay Differential Equations |
FAN
Li-qiang, ZHANG Yuan-ying, XIANG Jia-xiang, TIAN Hong-jiong |
It is focused on numerical dissipativity of two-stage -method for
delay differential equations with a constant lag. It is proved that
the two-stage -method is dissipative if and only if . One numerical
experiment is given to illustrate our result. |
| Suboptimal
Nonlinear Filters for Tracking a Ballistic Target |
ZHANG
Shu-chun, HU Guang-da, LIU Si-hua |
It is studied the problem of tracking a ballistic object in reentry
phase from radar observations. A model with highly nonlinear state
and measurement equations is considered and the theoretical Cramer-Rao
lower bounds (CRLB) of estimation error are derived. In our work three
suboptimal filters are designed and their error performances are compared
with CRLB. Besides frequently used filters in nonlinear filtering
problems as the extended Kalman filter and the unscented Kalman filter,
a new filter combining reduced sigma point unscented transformation
with classical Kalman filter is presented. The simulation results
favor the last that keeps the balance of good accuracy and tolerable
computational complexity. |
Asymptotic
Stability of Linear methods
for Nonlinear Pantograph Equations
|
YU
Yue-xin, WEN Li-ping, LI Shou-fu |
Linear stability properties of numerical methods for pantograph equations
have been studied by several authors, and many significant results
have been obtained. However, little attention has been paid to the
nonlinear case. Linear methods with variable stepsize are applied
to nonlinear pantograph equations and the conditions for the presented
methods to be asymptotic stability are obtained. |
| Asymptotic
Stability of methods for Nonlinear Stiff Delay Differential Equations
in Banach Spaces |
WEN
Li-ping, LI Shou-fu, YU Yue-xin, WANG Wen-qiang |
The
sufficient conditions are established for the linear and one-lag methods
to be asymptotic stable when applied to a class of nonlinear Stiff
delay differential equations in Banach spaces. For some stiff problems
in the fields of scientific and engineering, it may happen that the
one-sided Lipschitz constant is very large even if the problem is
well conditioned, which causes the existing numerical theory in Hilbert
space impracticable, but the stability criteria established in the
present research are still applicable. |
Test
and Comparison of Numerical Methods
for Stiff Volterra Functional Differential Equations
|
FAN
Hua, LI Lin-hai, NIE Qin-wu |
Several
classes of efficient numerical methods are recommended for solving
nonlinear stiff Volterra functional differential equations (VFDEs),
and the validity of B-theory of numerical methods for VFDEs presented
by Li Shoufo[1] in 2001 is further demonstrated by a series of numerical
experiments using the methods recommended above. Furthermore, the
characteristic and the advantages of the methods are illuminated,
respectively, by analyzing and comparing the numerical results, which
provides techniques for choosing numerical methods for the large scale
stiff computation which appears in various scientific and engineering
practical problems. |
| Research
and Semi Physical Simulation for the Compensation Observer of Wheel
Low Speed Friction |
WANG
Feng, ZHANG Shi-jie, CAO Xi-bin |
When
the reaction wheel¡¯s speed crossing zero, step change in the friction
moment of wheel seriously influences the accuracy and stability of
satellite attitude control. The paper presented a compensation observer
to improve the low speed friction characteristic of wheel, and also
validate the performance of the observer using semi physical simulation
based on dSPACE simulation system and wheel. The simulation results
indicate that observer can efficiently improve the capability of attitude
control and overcome the influence of satellite attitude control accuracy
and stability caused by friction. |
| Design
of Inertial Navigation Simulation System |
RAO
Xue-jun, CHEN Hong-lin |
An
inertial navigation simulation system which uses 1553B buses, 429
buses and Ethernet network is designed. It is introduced the content
and function of the simulation system, and it is also presented the
methods of the software and of the hardware. The test in avionics
simulation system proves that the design of inertial navigation simulation
system is feasible. |
| Design
the Distributed Simulation Platform for Integrated Management of Airborne
Electromechanical Systems |
LIU
Qiao-zhen, QIU Li-hua, WANG Zhan-lin |
This
paper designs the system framework of the distributed hardware-in-loop
simulation platform for comprehensive management of airborne electromechanical
systems based on the study of the traditional one, and this framework
changes the loose, disordered and miscellaneous layout and structure.
This paper proposes the software and hardware structures introducing
the technology of real-time extension module RTX and 1553B bus with
double redundancy, which make the system have real-time and fault-tolerance
performance. This platform provides kinds of common model libraries,
so user can simulate the integrated management of various types of
airborne electromechanical systems. By modularization, this paper
designs the software structure which is provided with scalability
and open characteristic. |
| Study
of Wind Turbine Systems Simulator |
SUN
Yao-jie£¬KANG Long-yun, SHI Wei-xiang£¬CAO Binggang, YANG Zhong-qing |
Nature
wind stochastic property and frequency domain properties such as power
spectrum and information entropy are analyzed by the method of stationary
random processes. Based on analytical parameter of wind model and
Monte Carlo method, a novel dynamic wind machine simulator is designed.
As the torque property of turbine, Monte Carlo method is applied to
accurately simulate torque in random wind speed with statistics law
of wind speed distribution. According to the calculated torque value,
the servo mechanism is controlled to simulate the running behavior
of turbine in nature. The correctness was verified by simulations
and experiments. The results show that the simulator has excellent
ability to simulate dynamic character. |
Research
on Control Functions Framework of Distributed
Multi-Agent Simulation System
|
CAO
jun-hai, XIONG guang-leng, XU zong-chang |
Based on the research of Agent-Based Discrete Event Simulation technique,
it is put forward a control functions framework for Distributed Multi-Agent
Simulation System (DMASCF). The framework consists of Input Interface
Control, Output Interface Control, Model Structure Control, Simulation
Clock Control, Experiment Data Control, Simulation Experiment Control
and Simulation Logic Control. It is analyzed the principle and work
mechanism of those control functions, and discussed the distributed
modeling and hierarchical modeling characteristics of Multi-Agent
Simulation System. |
Exploring
of the Motion Compilation System
in Bianzhong Choreography
|
SHENG
Jian-hui, SHAO Wei, SUN Shou-qian |
It
is summarized the Bianzhong choreography and the significance of exploring
its¡¯ Motion Compilation System. It is simply introduced the course
of the motion database on a virtual model for the Bianzhong choreography.
Long breath is taken to analyze motion categories and their corresponding
relationship under the dancing syntax. The theory for identifying
the motion style under the emotion model is probed, and a methodology
is presented that can achieve the motion connection by delimiting
the feature of characteristically motion unit and their related restriction.
It is also shown the whole frame work of Motion Compilation System
by the methodology. |
| Modeling
and Simulation for Dynamics of Single Wrapped Elevator |
FU
Wu-jun, ZHU Chang-ming, ZHANG Chang-you |
A
virtual prototype of the single wrapped elevator was developed based
on the multi-body system dynamics in the ADAMS environment. In this
model, the whole system was disassembled to Driving system, Guide
roller system, Passenger system and Cable system. The virtual running
environment was established by exerting the disturbance from the unbalanced
driving motor and the guide rail on the elevator system. The simulation
results show that the unbalanced motor results to the vertical vibration
and that the peak value of the horizontal acceleration is proportional
to the traveling speed. |
| Spacecraft
Docking Rotating Simulator Based on Virtual Prototype |
LAI
Yi-nan, Zhang Guang-yu, CHEN Zhi-gang |
With
the application of multi-disciplinary knowledge synthetically, such
as the calculation of the multi-body dynamics, the structural mechanics,
the impact theory and so on, a visual virtual dynamic prototype model
about rolling and pitching simulator of spacecraft docking test table
in the docking process is built on ADAMS/Solver platform. An integration
of UG-MATLAB-ADAMS-ANSYS simulation environment is realized in the
process of building prototype models. By combination of the advantages
of all software, it is focused on dynamic analysis, and it is also
studied the effect degree of the key parameters such as bearing friction
coefficient to the whole system. The simulation results are true by
the verification mutually of mathematical simulation and virtual dynamic
simulation. The virtual simulation results verify the feasibility
of the initial structure design, establish the design key points in
the physical prototype, and give further design considerations about
optimization design of the rotating simulator. The problems in ADAMS
are also solved such as simulating bearing etc. |
| The
Development of Precalciner Virtual Prototype |
HUANG
Lai, LU Ji-dong, XIA Fan, ZHANG Zhen-ding, LI Chang-jun |
The
physicochemical process of precalciner used in cement production is
analyzed, and the mathematical models (fluid dynamics, combustion
dynamics, decomposition dynamics and particle dynamics) are developed
to describe the work process in precalciner. Based on these works,
the numerical simulation method is combined to develop the virtual
prototype of precalciner, which can provide an experimental platform
for design and development of precalciner. |
An
Highly Immersive and Interactive Molecular
Visualization System for Education
|
LUO
Yan-lin ,SUN bo |
We have discussed our initial work on the use of visualization and
virtual reality for bio-informatics education especially for providing
three-dimensional concepts of bio-molecular structure. Our system
is composed of multi-projection screens and offers a channel to reach-into
the molecular space in an immersive and interactive environment. Six
to ten people can stand in the immersive multi-projection system and
view the stereoscopic images, while one of them using an intuitive
6DOF haptic device Spidar-G system controls the perspective. For educators,
our system become instruction aided tools for helping student facilitates
understanding bio-molecular structure through effective visual representation
and interactive manipulation. |
Research
of Dynamic Terrain Based on Regular Triangles
in Complex Battlefield Environments
|
CAI
Xing-quan, LI Feng-xia, ZHAN Shou-yi |
It is analyzed the different recent algorithms for representation
and visualization of multi-resolution static terrain, and then ROAM£¨Real-Time
Optimally Adapting Meshes£© algorithm are selected as the basic algorithm
of the dynamic terrain. Some improvements and extensions to ROAM are
presented. A novel technology of regular dynamic terrain and irregular
dynamic terrain is also presented. At last, the experiments prove
the plan feasible and available. |
| Data
Compression for Multi-resolution Mesh |
FANG
Tong-zhu, TIAN Zheng, HU Zheng-guo, JIN Wen-kai |
A
simple multi-resolution representation approach and a compression
scheme for triangular list data are presented. Through rearrangement
the vertex indices in the original triangle list according to the
mesh simplification order, the single-resolution mesh is constructed
directly into a multi-resolution representation, the storage space
of a multi-resolution representation is 100% of that of the single-resolution
representation, reaching low bound. On the basis, the triangle list
data of the multi-resolution mesh is compressed by compressing that
of a single mesh. Experimental results show, by compression, the multi-resolution
representation can reduce storage space by 30% than the single-resolution
representation. Both of the multi-resolution model construction approach
and compression approach are very simple and suitable for arbitrary
triangular meshes. |
| The
Collision Consistency in Distributed Virtual Environment |
XU
Chun-lei, LI Si-kun, ZENG Liang |
This
paper discusses the problem of collision consistency in the distributed
virtual environment, and analyzes the representation and the course
of it. A control method based on prediction is presented to guarantee
the collision consistency in the distributed virtual environment.
The application of the method in a distributed virtual environment,
DVNE, is discussed finally. |
| Dispersed
Featured Point Detection |
SONG
Han-chen , WU Ling-da, WEI Ying-mei |
Based
on setting up a new feature point response function, we propose a
new feature point detection algorithm. By image segmentation, computing
feature point in each block and continuous feature points set reduction,
the dispersed feature point set is reached. The experiments prove
that the detection efficiency is improved, while the feature points
mass due to traditional global response threshold is avoid and most
of the insensible feature points are preserved. |
| Levels
of Frequency of Particle System |
PI
Xue-xian, LI Si-kun, SONG Jun-qiang |
To
improve the efficiency of simulation of nature view, it is presented
a new concept of Level of Frequency (LOF). After analyzing the characteristics
of different nature meteorological phenomena, different frequencies
can be specified for them and create a model of LOF. According to
the LOF, reassignment of computation resource can be made, and thus
better representation of scene will be created. Additionally, the
presentation of LOF, makes it easy to split the task of nature scene
simulation, and can benefit the realization of paralleled process
in the future. |
| Lod-based
Algorithm of Tin Model for Large Terrain Simulation |
WU
Yu-guo, DU Ying, WANG Xiao-ming, YOU Xiong |
It
is presented a LOD-based algorithm of TIN model, which is quite suitable
for terrain rendering in large 3D landscape. The emphasis focuses
on issues of transition between TIN models with different resolutions,
and generation of these models, such as how to design data structures
and how to optimize algorithms when constructing a Delaunay triangulation. |
| Fast-Speeding
Navigation: Combining Walking with Flying |
JI
Lian-en, ZHANG Feng-jun, FU Yong-gang, DAI Guo-zhong |
Navigation
in large and complex virtual worlds is a challenging interaction task
that needs to meet various requirements. Most existing 3D navigation
techniques usually only fit for some special virtual scenes. In order
to improve adaptability and performance of navigation technique, a
new 3D navigation technique, fast-speeding navigation combining walking
with flying, is proposed. This technique automatically controls and
switches modes and metaphors of navigation according to user¡¯s intentions
and the context of virtual environment. Through seamless combination
of flying and walking, the efficiency of navigation in complex virtual
environments can be improved effectively. |
Study
of Characteristics of Different Objective Functions
in Geometric Modeling
|
ZHANG
Ai-wu, ZHANG Cai-ming |
In
geometric modeling, curves and surfaces are often generated by minimizing
objective functions such as length, energy and curvature variety.
It is discussed the impact of the functions and their approximate
functions on the interpolating cubic spline condition, including the
shape, the distances from data polygon and numbers of inflexion of
the objective curves. Applications to locally estimating tangent of
data points are discussed, and instances show that minimum curvature
variety curve generally gets better result than other methods. |
| Virtual
Mankind Simulation for Web-based Customization Design |
JING
Shao-yu£¬GOU Bing-chen£¬LU Chang-de£¬YU Sui-huai |
In
order to develop the realistic virtual Human adapted to web-based
customization design, it is presented the way of virtual human simulation
based on H-anim, and fulfilled the parametric geometrical model and
Joint animation of virtual human according to the joint architecture
defined by H-anim. It is constructed the behavior simulation system
utilizing the methods of behavior template, rule-based reasoning and
the case-based reasoning, and introduced the application of virtual
human simulation in the web-based customization design of homeware
at last. |
Sensor
Fault Diagnosis Method in ESP System
with Support Vector Machines
|
ZHENG
Shui-bo, TANG Hou-jun, HAN Zheng-zhi, ZHANG Yong |
Sensor
forecast models in ESP system are constructed with support vector
machines (SVMs) regression algorithm. DAGSVM (Directed Acyclic Graph
SVM ) classification algorithm is applied to sensors fault isolation.
The research result indicates the application of SVMs to sensor fault
diagnosis in ESP system is effective and feasible. |
| Simulating
of Digital Self-Adaptive Control Based on Model for Electrode Regulator
System of Arc Furnace |
LIU
Xiao-he, WANG Yong-she, HOU Hao-lu |
It
is studied the electrode regulator system of electronic arc furnace
(EAF), provided a piecewise-linear (PWL) model-reference self-adaptive
control algorithm, constructed a digital control system, achieved
the best control parameters using the Genetic Algorithm(GA), and simulated
the digital control system with Matlab Simulink. Compared with the
traditional PID electrode regulator system of EAF, the simulating
results show the advantage of self-adaptive control system. |
| Study
on Post-boost Vehicle Control Order Producing System |
DING
Bao-chun, XUE Ji-ming, CHEN Qi-chang |
In view of the control order production problem for a post-boost vehicle
system, in space, to maneuver the missile as its re-entry vehicles
are deployed in sequence, the powerful way to produce a post-boost
control order through comprehensive utilizing system simulation, vehicle
control and multiple objects optimization technique is discussed.
Then, the method for designing a control order producing system is
provided and the key technique for accomplishing the system is introduced
in detail. In the end, the cruces need to be studied and solved further
for developing the system is pointed out based on the synthetic analysis
to the principle test of the control order producing system. |
| Multi-channel
MMSE Equalization with Time Delay Optimization |
ZHAO
Feng, WANG Jin-long |
The
equalization of the multiple-channel system which can be obtained
by fractionally spaced sampling is studied. Minimum mean square error
(MMSE) equalizer for multiple channels was introduced, and it shows
that there is a corresponding optimal time delay in each subchannel.
The analysis of choosing the time delays gives the bound of the optimal
time delay. The simulation results show that the performance of the
MMSE multi-channel equalizer would not have obvious degradation if
every time delay of subchannels was chosen as the parameter which
equals the value bigger than the corresponding subchannel order by
one. Furthermore, the complexity of the system structure is reduced
greatly. |
| Artificial
Neural Network-Based Nonlinear Predictive Optimal Control and Simulation |
WEI
Dong, ZHANG Ming-lian, ZHI Jin |
A
multi-layer forward neural network acted as the optimal feedback controller,
which was trained with optimization algorithm based on the Hamilton-Lagrange
method as well as the predictive optimization to compensate for disturbances
and uncertain plant nonlinearities. The controller can approximate
the optimal feedback solution of nonlinear-time-varying systems without
the complexities of computation and storage problems of the classical
optimal methods. Additional neural networks were used to predict some
time-varying parameters to achieve the real-time predication of the
dynamic behavior. An optimal control system was designed to control
a Variable-Air-Volume (VAV) system, which aimed at optimizing thermal
comfort and energy consumption. Simulation results illustrate the
effectiveness of this technique. |
| Facial
Curvilinear Lineament Extraction and Unifying |
TONG
Xiao-yang, YANG Ming-li |
The
methods of face rough extracting, edging detecting and section connectivity
filtering are presented to extract facial curvilinear lineament. The
main processes of the algorithm are that, firstly, rough rectangular
lineament of face is detected by rough face extracting, then some
methods are taken orderly, which include edging detecting, effective
information dimidiating, section connectivity filtering, revising
of the contour points, vertical and horizontal projection of preferential
section and whole image, and finally, the borders of facial image
are delimited to dispose of the disturbing of background. The unifying
of facial image is discussed later. The accurate delimiting of facial
lineament is aiming at the simplex background, as well as the complex.
The experiment results confirm that the algorithms are efficient.
The algorithms have been successfully applied in a face recognizing
system. |
| A
Preliminary Investigation on Artificial Transportation Systems |
TANG
Shu-ming, WANG Fei-yue, LIU Xiao-ming, JIA Xing-wu , LIU Xue-jun,
LI Jian-xin |
It
is introduced the concept of artificial transportation systems (ATS),
which is a new method for investigating complex transportation systems,
an application of artificial societies in traffic simulation systems,
and the results of the development of traffic simulation and the improvement
of computational abilities. First, issues regarding the relationship
between the artificial transportation systems and traffic simulation
methods are addressed. Second, it is introduced the research foundations
and the bottom-up agent-based modeling as the key method for describing
and analyzing artificial transportation systems. Third, several possible
approaches are available to study the artificial transportation systems.
Finally, conclusions are given with remarks for future study of ATS. |
Statistic
Analysis of Input Data for Reliability Evaluation
of Complex System with Simulation
|
YANG
Yu-hang, LI Zhi-zhong, ZHENG Li |
Statistic
analysis of input data is discussed for reliability evaluation of
complex systems with simulation, especially when trial data is inadequate
(i.e. small sample). Monte Carlo technique combined with Bayes method
or improved Bootstrap method is appropriate for reliability evaluation
in small sample cases. After discussion of triangular distribution
method based on expert experience when no trial data are available,
an improved Bootstrap method is proposed where Bootstrap method is
combined with prior information and expert experience so that sample
information can be well utilized. The integrated method is believed
to be more practical in reliability evaluation of complex systems.¡¡ |
| A
Swarm-based Artificial Ecosystem Model |
SA
Li£¬XIONG Fan-lun |
It
is presented an Artificial Ecosystem (AE) model based on Swarm, with
the help of which the evolution of pest in local agro-ecosystem is
simulated. In this artificial ecosystem, each agent is located in
a simulated space of 2D grid, and each iteration of the simulation
is based on a parallel update of the agents conforming local rules.
The artificial ecosystem offers a transparent, accessible, and adaptable
ecological model template, which can be integrated into a model base
of ES for insect pests¡¯ control. |
| Simulation
of Real-time Wireless LAN MAC Protocol |
CAO
Chun-sheng, ZHANG Qi-zhi, YIN Ru-po, LI Feng |
OPNET
is a powerful network simulator, which can be used to simulate communication
systems and predict network performance. The traditional wireless
LAN can not be used directly in the industrial areas because of its
characteristic of the message¡¯s delay indetermination. Considering
the demands of industrial applications, it is introduced a real-time
wireless LAN MAC Protocol. The modeling and structure of nodes and
modules, and the results of delays for the different types of nodes
are presented. The simulation results show that the protocol can satisfy
the demand of real-time, and meanwhile the throughput of general nodes
are increased due to collision avoidance. |
| Simulation
of Control Strategy for Hybrid Electric Vehicle |
QIAN
Li-jun, XI Zhu-yong, JIN De-quan |
Considering
the batteries charge-discharge balance and the engine fuel efficiency
under the given driving cycle, it is presented the control strategy
using fuzzy logic. The model of control strategy is based on ADVISOR2002
and is simulated under several driving cycles and different control
strategies. The results have proven that the fuzzy logic control has
the well robustness. This strategy can distribute the torque between
the engine and motor reasonably and can keep the balance of battery
SOC. |
| Stand
Off Attack Simulation Frame and Maneuver Chains Design |
KONG
Xiang-jun, GAO Zheng-hong, SHANG Chong-yang |
Air-to-Surface
simulation system includes many subsystems. The subsystems synthesize
a simulation system through simulation frame. Through analysis of
Stand Off Attack characteristics, Stand Off Air-to-Surface (AS) combat
simulation frame is discussed. Based on a mission profile, maneuver
chains for Stand Off Attack are designed. Finally, a Stand Off Attack
simulation system is built up. A simulation example is carried out
for attack aircraft Stand Off Attack, through which, the corporation
between aircraft and AS missile is discussed. |
Simulation
Investigation of Wastewater Discharge Control
Focused on River Water Quality
|
FAN
Li-ping, YU Hai-bin, YUAN De-cheng |
The
urban sewer systems and the wastewater treatment plants have detrimental
impacts on the receiving river water quality. Focusing on the river
water quality, to control wastewater outflow discharge based on the
receiving capacity of the river can preserve the river ecological
quality effectively. Based on the River Water Quality Model no.1 (RWQM1)
issued by the International Water Association (IWA), the simulation
software for river systems is developed with MATLAB programming language,
and the problem of wastewater discharge control focused on river water
quality is studied by using the ammonia concentration at the river
section as an index. Simulations verify the effectiveness of wastewater
discharge control based on river water quality. |
Variable-Parameter
Design and Simulation about Digital Autopilot
of Compound Stabilization Loop
|
FENG
Dong-zhu£¬WANG Min-gang |
The traditional method of selecting parameters in the autopilot system
is to find an optimized set which can make the system work well at
different Mach numbers. But now the parameters of digital autopilot
system can be easily designed, changed and loaded at real-time, at
different flying states and at different Mach numbers by missile-borne
computer. The features of compound stabilization loop are analyzed
to provide a new method for selecting parameters in the closed-loop.
All Models and data are simulated with Matlab software to provide
a good reference for engineering application. |
| Simulation
Analysis of Ship-Diesel-Pump¡¯s Dynamic Cooperation while Waterjet-propelled
Catamaran Turning |
LI
Yan-fei, CHEN Guo-jun, ZHANG Wei-dong, KONG Qing-fu |
It
is established the maneuverability model of a type of catamaran propelled
by waterjet-propulsion based on MMG equation, and analyzed the cooperation
of the ship-diesel-pump while the catamaran in turning motion. Through
integrating the manoeuvrability equation in MATLAB/Simulink, the motion
parameters of the ship and the load parameters of the diesel and the
pump are evaluated. The results of the simulation show that the ship¡¯s
maneuverability with waterjet-propulsion unit is better than which
with propeller-propulsion unit, and it can protect the diesel from
overload. But in order to protect the pump, it is not suitable for
the ship with waterjet-propulsion system to turn in high speed. |
| Research
on Performance of Aggregating Self-similar Traffic Stream |
WANG
Chu-yan, MA Xiao-lei, XU Qi-jian |
Traffic
stream displays the similar statistical properties across a wide range
of time scales in Packet-Switched Networks. It¡¯s a popular way to
analyze the self-similar stream with FRP model. It is discussed parameters
of the aggregating self-similar traffic streams, including average
arrival rate l, Hurst parameter H and fractal onset time scale(FOTS).The
statistics characteristic of traffic stream is also presented. |
Design
and Implementation of Neural Network
Controller-based Matlab Simulink
|
WANG
Gui-juan£¬XU Hong-dong, WANG Zuo-xun£¬XU Qiang , ZHANG Yuan-guo |
It
is introduced that three Design of Neural Network Controller is finished
using BP network in the base of three normal controlor. Including
Neural self-adjustment controlor, Neural Network PID Controlor and
Model reference adaptive controlor. It is trained in BP method and
three simulation examples is simulated by MATLAB software .The result
of simulations are given to show the effectiveness. |
| Application
of Grid Computing in Military Simulation |
WEI
Hong-tao, SHI Feng, LI Qun, WANG Wei-ping |
The
Grid provides a geographically distributed and heterogeneous resource
sharing environment. As Grid¡¯s middleware, Globus toolkit provides
an infrastructure for Grid-based application. The simulation community
have begun to use Grid and achieved some experiences. After introducing
the state of arts and the development trends of Grid used in military
simulation, we discuss the services and supporting capabilities which
the Grid can provide for military simulation and propose an architecture
for simulation over the Grid, including virtual, constructive and
live simulation. Our current research areas about Grid-based simulation
are summarized in the end. |
| Simulation
Comparisons among Neural Networks Control, Model-free Adaptive Control
and PID Control |
ZHU
Juan-ping, HOU Zhong-sheng, XIONG Dan |
Under
the identical conditions, three different control strategies only
using I/O data are compared through simulations. The three controlled
systems are taken from Ref.[1] and Ref.[5], each of which has its
own advantages and shortcomings. Simulation results indicate that
the model-free control method is superior to the other two methods
because it can deal well with the control problem of the discrete
time nonlinear plant whose structure, parameters and order are time-varying. |
Simulation
Method and Application of Torpedo Homing System
HWIL Simulation Based on Underwater Acoustic Field
|
YANG
Yun-chuan, CUI Huai-lin, LI Zhi-shun |
Because
of the complexity of tactical environment in which the torpedo¡¯s homing
system are working to detect and classify target, the torpedo homing
system Hardware-In-the-Loop (HWIL) simulation has become a vital tool
in developing and evaluating torpedo guidance performance in laboratory.
The constitutions of the HWIL simulation system are given, and the
working principles of the simulation system are introduced. Some key
technologies of the system are discussed such as the models of the
underwater acoustic environment, homing system signal processing simulation
DSP system, and real-time time-varied narrow-band acoustic signal
generating. The methods to simulate the target scale characteristic
with a circular arc array placed in an anechoic pool are presented.
The HWIL simulation result show that the method is effectively in
torpedo homing system simulation and testing. |
|
