| Title |
Author |
Abstract |
| Research
of a Runtime Supporting Infrastructure Based on XML |
GOU Ling-yi, XIE Jin-chong, XIONG Guang-leng |
To meet the requirements of the DIS platform in the
car product lifecycle, using the XML technology and database technology,
this paper proposes an architecture for the runtime supporting
infrastructure of DIS based on XML. The interface between XML and database
is the key to the implementation of the architecture. Based on the
thorough study of the transferring mechanism for model mapping between XML
and database, an applicable solution for the interface between XML and
database is offered. |
| The Architecture of Collaborative Simulation Environment |
WANG Jiang-yun, WANG Xing-ren,
JIA Rong-zhen |
Collaborative simulation environment that integrates
various simulation/modeling tools is the main trend in simulation domain.
The architecture is one of the most important factors that influencing the
performance of collaborative simulation environment. In this paper, the
general concept of the architecture and the general design proposal are
discussed. Then, based on the characteristics and the requirements of
collaborative simulation environment, combined with the lab facts, adopted
the advanced information technologies; the authors devised a hierarchical
architecture. |
| Research
on Distributed Virtual Environment in the Simulation of Multi-aircraft
Cooperative Air Combat |
Cai Meng , Xu
Nai-Ping, Li Ke-Ji |
By applying distributed virtual environment technology
to the simulation of multi-aircraft cooperative air combat, a new
simulation system based on distributed virtual environment is built up.
The design idea, the structure of the system and the analysis and the
settlement of the key technologies are introduced in this paper. |
| Blue
Aviation Sub-system in Fleet Air-Defense Simulation System |
HAN Liang, SU Jing-duo, GU Hao,
CHANG Yong |
In
order to verify the air-defense capability of the fleet-weapon system in
the battle condition by means of simulation, we develop the blue aviation
sub-system during the concept design. During simulating exercise, the
simulation data in the blue aviation sub-system is transmitted by the blue
Network Interface Unit and is exchanged with fleet sub-systems through the
main-network according to the standard data protocol。The aerodynamic model and the limited parameter
model are all concerned in Computer Generated Air Force dynamic modeling,
and the Artificial Intelligent tactic decision technology is applied in
the blue aviation sub-system. |
| An Overview of an Observation and Analysis
System for DIS |
ZHENG Yang-fei, YANG Ming, WANG Zi-cai |
In this article, we describe an observation and
analysis system for Distributed Interactive Simulation (DIS), which
consists of modules, functions and characteristics, system structure, and
some key technologies. The system implements data log and data statistic,
observation and analysis of simulation exercise, generation and publishing
of report, functions of recording data in the whole simulation procedure.
It can also check entities, replay process, display exercise data
visually, generate statistic record automatically, exercise result and
evaluation report, provide a powerful computer aided tool for development
and debugging of DIS. Finally a demonstration application in DIS is given. |
| The Operator Interface for Computer Generated Force |
CUI Wu-lun, GONG Guang-hong |
As a important part of DIS, CGF plays an important
role more and more in the area of multi-force & multi- platform
jointed warfare environment simulation. As an important part of CGF,
Operator Interface often cooperates with control platform to administrate
SAF. This paper firstly introduces the function and composition of CGF,
then the realized way for BUAA experimental system. |
|
Research
on Information Interconnecting in Ballistic
Missile
Defense Simulation System
|
CHEN Lei, WANG Hai-li, ZHOU Bo-zhao, WANG Yue-feng |
It is an important problem for ballistic missile
defense simulation system to realize unbiased, correct and credible
communication between the opposite sides of the system. The paper studies
the problem based on information classifying. The method of Group
Communication is applied to reduce the traffic in distributed simulation.
Every entity in the system is grouped by the method of Space of Interest.
And impartiality of information transfer is ensured by the means of signal
simulator. The presented methods are proved to be feasible and effective
in the practice of ballistic missile defense simulation system. |
| Research and Implementation of Virtual Assembly System |
TAO Pin, YE Zhen, WANG Yang,
SUN Zeng-qi |
Virtual assembly is the new research field in VR. From
the viewpoint of VR, this paper introduces some key technologies and the
solutions in building a virtual assembly platform (VAP), which focus on
assembly relationship defining, assembly object managing and collision
checking. Furthermore, a practical example of the VAP and some discussions
of this platform are also presented in this paper. |
| Preliminary Research on Virtual Reality in Process Schedule for Enterprise Automation |
WANG Tao，FEI Min-rui |
In this paper, a new kind of process schedule based on
VR for enterprise automation — Virtual
Workshop is presented. The basis of Virtual Workshop, a 3D virtual
environment, is constructed by the method of Geometry-based VE. By 3 gestures — navigation, push, grasp, user can navigate in Virtual
Workshop in 8 directions. Data can be acquired timely and displayed in
real-time by virtual instruments. Besides, user can inputs values, grasp,
move, and release virtual instruments with gestures in Virtual Workshop. |
| Special Effects Generating Technology in Aerospace Visual Simulation |
ZHOU Hui, CHEN Shan-guang,
YUAN Hong, SHEN Xu-kun |
In this paper, three methods: texture mapping,
particle system and fractal image generation are discussed and analyzed to
generate fire, smoke, clouds and fog in aerospace visual simulation. In
addition, Billboarding and volume rendering are introduced in texture
mapping. |
| An Algorithm of Cloth Modeling and Simulation |
ZHONG Yue-qi, WANG Shan-yuan |
By means of Gouraud shading and OpenGL programming, a
cloth model based on particle system shows perfect graphics on fabric
draping simulation, which could be used as a real-time rendering algorithm
for 3D cloth and garment CAD system. |
| The
Extended Morphing Method Facing Virtual Scene Rending |
ZHOU Tian, LU Dong-ming, PAN Yun-he |
This thesis proposes an extended Morphing method to
overcome the limitation of Morphing method based on diagnostic line. We
called this method “Morphing+”. This method adds the mapping
relationship between images to satisfying perspective. And it adds the
distance from pixel to the midpoint of diagnostic line as a parameter to
adjust the effect of diagnostic line. At the same time, we introduce the
concept of “position diagnostic line” to control the visibility of
objects in the scene, that make the effect of diagnostic line more
realistic. The Morphing+ overcome some problems in traditional morphing
method based on diagnostic line, and accelerate the rending processing.
The result scene image is more realistic. |
|
The
Research on an Algorithm for
Real-Time
Interacting Mass Dataset Terrain Model |
Xu Hong, Shu
Guang |
In this paper, an algorithm for real-time interacting
mass dataset terrain model is introduced. The algorithm is based on RTIN
(Right-Triangle Irregular Network), and terrain LOD is selected adaptively
using view-dependent LOD control method. The global error is bounded by
computing the local error, and a friendly interactive manner is provided
for continuous LOD. |
|
Large
Container Ship Marine Engine Room Simulator Based
on
Networking Technology |
Zheng Hua-yao |
Marine Engine Room Simulator is a necessary equipment
for modern navigation education, which is placed in the rank of evaluated
items by the Maritime Affairs Bureau of China according to STCW Code 1995.
In recent thirty years, MERS was developed very fast and has been improved
for several stages. By the aid of computer networking technology, Shanghai
Maritime University investigated a novel large simulator for modern
container. This paper introduces the technical feature and structure of
MERS computer system, the real time control software platform, the
developing technology for man-machine interface software and system
simulation utilities and MMI software. |
| Simulation
of Centrifugal and Vibration Compound Dynamical Environment |
YU
Jian-jun, YAN Gui-rong, XU Jun,
DU
Yan-ting |
Based on mathematical model of compound dynamical
environment consisted of centrifuger and vibrator system, a method
combined by structure dynamics, FEM analysis and visualization technique
is presented to simulate centrifuge and vibration compound environment. In
this paper, the design method of simulation software is discussed firstly.
And then the structure of the centrifugal and vibration compound dynamical
environment simulation software CED_VSIM is introduced, and the method of
applying graphical techniques such as data field visualization and
dynamical data field displaying technique to post-processing of FEM
computation is discussed, and the interface method of CDE_VSIM and Matlab
is discussed. Finally the mathematical model of compound dynamical
environment consisted of centrifuger and vibrator system is justified
compared by simulation and experiment results under centrifugal. |
| A
Modified Neural Networks Control Algorithm and the Corresponding
Simulation Experiments Research |
DU Hai-feng, WANG Sun-an |
There is a problem in neural networks control system.
The error that is adopted by learning methods in neural networks in theory
does not equal the system’s error in reality, so the behavior of the
neural networks will be affected. A new control structure that can settle
the question to some extent is put forward in this paper, and the
corresponding learning methods are discussed. Through the simulation
experiments research, the reasonableness and effectiveness of the method
is proved. |
|
Neural
Network Tracking Control and Simulation for
a
Class of Unknown Nonlinear Systems |
LI Lin-lin, ZHANG Guang-ying,
ZHAO Chang-an |
Based on input/output feedback linearization approach
and Lyapunov method, the problem of adaptive robust output tracking
control for a class of nonlinear dynamic systems with unknown
nonlinearities is investigated in this paper. Firstly, applied coordinates
transformation and input transformation, the nonlinear system is
transformed into partially linear controllable system. Then the technique
of the multi-layered feed-forward neural networks is employed to perform
approximating unknown nonlinear functions. The weights of the networks are
updated on-line according to the Lyapunov principle, which overcomes the
stability problems associated with many neural networks control systems.
Moreover, the networks weights are pre-trained off-line by genetic
algorithms to reduce the weights learning time. Finally, an adaptive
robust control law based on neural networks modeling is developed and the
stability proof is given in the sense of Lyapunov. The proposed control
law guarantees that the output tracking error and the states of the
obtained closed-loop systems are uniformly ultimately bounded. The
effectiveness and robustness of the presented control scheme are
demonstrated in the case of van der Pol
system. |
| The
Solving of Job-Shop Scheduling Problem Based on Genetic Algorithm |
LI
Xiu,
LIU Wen-huang,
JIANG Cheng-yu,
WANG Ning-sheng |
Based on the analysis of various ways in solving
Job-Shop scheduling problems, the mathematical model of Job-Shop problem
is introduced. A kind of genetic algorithm is used to solve it in this
paper. Firstly, the chromosomes are encoded, and the population size is
premised for the optimized goal of Job-Shop problem, which are the keys of
the method. Secondly, the fitness function is designed. After using
selection, crossover and mutation operator, and then elitist strategy to
prevent the premature convergence, a best or satisfactory scheduling path
can be found. The executing results using the presented algorithms in
certain project case are shown in the paper. |
| A
Data Mining Platform DBMiner and Its Applications |
Yang Jie,
Ye Chen-zhou, Chen Nian-yi |
Data mining is an important tool for intelligent
information processing. In this paper, a data mining platform DMBiner is
introduced, its composition and principle are described. A layered data
mining approach based on multiple knowledge models is presented. The
algorithm for constructing decision trees based on the integrated
heuristics improves the structure and classification accuracy of the
decision trees induced. A GA-based algorithm for searching optimal
parameters in n-dimension space can realize global optimization and
improve the search efficiency. This data mining platform has
satisfactorily applied in some areas. The applications in prediction of
ternary intermetallic compound formation and in domestic medical remote
ward are described. |
| Study
on Optimization Design of the High-degree Band-block Filters |
Zeng Zhe-zhao, LI Ren-fa, Liu
Jian-fa |
It is very known that the convergence speed of the
conventional BP neural networks is slow and its learning efficiency low.
So is that, it attributes to the identity of the output functions of the
artificial neural networks. The main characteristic of the neural networks
presented in this paper is that its output functions are perpendicular and
different each other. It conquers effectively the disadvantage about the
conventional BP neural networks in the convergence speed and learning
efficiency. Furthermore, this paper discusses in detail the relations
between the amplitude-frequency characteristic of the FIR high-degree
band-block filters with linear phase and the algorithm of the neural
networks based on the cosine basis functions. The simulation results show
that the algorithm is efficient and excellent in the designs of the
high-degree band-block filters. |
| Subsumption Technique Using in Query Optimization |
WANG Xin-jun, HONG Xiao-guang,
WANG Hai-yang |
Most work on query optimization in OODB has
concentrated on tuning algebraic expressions and the physical access to
the database contents. The attention to semantic query optimization,
however, has been restricted due to its inherent complexity. Here, we
construct an OODB schema that recognizes subset relationships between a
query and a view, through which we can gain the object of query
optimization. |
| Analysis
of Modified Anterior Plate Instrumentation for Unstable Cervical Spine By
Finite Element Method |
Zhang Mei-chao, Huang
wen-hua,
Wang bai-chuan, Zhao Wei-dong,
Zhong
Shi-zhen |
In this paper, the finite element method (FEM) is used
to analyze the modified anterior plate instrumentation (MAPI), and the
stress/strain in MAPI under simulative physical load are solved. The
results are compared with that obtained from fatigue experiments and both
coincide on the potential zone of fracture. What’s more, the former can
offer the inside details and the process analysis. |
| Fuzzy
Control of the Four Level Inverted Pendulum System |
XIAO Jun, ZHANG Shi,
XU Xin-he |
The
four level inverted pendulum model is derived first. Then the
controllability of the system is discussed. After that, we proposed a
fuzzy control method based on three-dimension fuzzy composed variables.
Simulation experiment results prove the validation of the proposed method. |
| Design
of Risk Analysis System Based on Probabilistic Risk Assessment |
DONG
Xian-zhou, XU Pei-de |
In this paper, we discusses the feasibility of the
Risk Analysis based on Probabilistic Risk Assessment (PRA) method in the
engineering project. Based on this point, we designed a Risk Analysis
System based on PRA. This system can be applied to modeling Risk Analysis
and assess it in engineering project. It has some theoretic value and
applied value of project. |
|
|
LI Zong-bin, LI Tian-shi |
In this paper, the
conception of polychromatic graphs, its composition and standard
mathematical model are introduced. Calculating formula and means for path F(ui)
of polychromatic
graphs PG with contour disjunction matrix and those of polychromatic
graphs PG with contour conjunction matrix are presented. Finally an
example is cited. The polychromatic graph is a new information disposal
implement, which has powerful simulation functions for complex object and
system. |
| Study
and Implementation of Timing Control Mechanism in Military Strategic
Decision Simulation System |
SI
Guang-ya, HU Xiao-feng |
Seminar gaming is a popular method used in military strategic
decision-making simulation. Timing and flow control are key problems in
strategic decision-making simulation system. In this paper, we analyze the
features of timing control mechanism in strategic decision-making
simulation system and put forward time-based control mechanism and
event-based control mechanism, finally, we discuss the implementation
problems of these mechanisms in prototype SDS2000. |
| Simulation and Optimization of Shipping Business Based on Petri Net |
SHI Xin |
This paper makes use of the Petri net theory and the
software of ExSpect to study the optimization of the shipping business.
The main conclusions are: it is essential to improve the efficiency and
effectiveness of the shipping business; the Petri net theory and
ExSpect are good tools to analyze and optimize the shipping business; As
the combination of the information flow and the material flow, the core of
the optimization of the shipping business is to introduce the information
technology into the shipping business to speed up the transferring and
processing of the business information. |
| The
Research of Astrodynamics Simulation Based on MATRIXx |
WANG Hai-li, DAI Jin-hai,
CHEN Lei |
Astrodynamics Simulation is very important in the
field of aerospace. Current universal simulation software, such as MATRIXx
and MATLAB, could support the realization of astrodynamics simulation
system efficiently. Based on engineering practice, the paper discusses the
application scope of MATRIXx in Astrodynamics Simulation, and provides
expanding methods to fit actual needs. |
| Back
Propagation Algorithm Using Dynamic Optimal Learning Rate |
WANG Zi-cai, SHI Yun-hui, CUI Ming-gen |
This paper considers an efficient back propagation
algorithm using dynamic optimal learning rate .The optimal learning rate
is obtained by an iteration formula. This algorithm has the following
merits: simplicity of computation, quickness of convergence and high
precision. The simulation results are given to demonstrate the
effectiveness of this algorithm. |
| Design
and Simulation for Terminal Guidance Law of Long Range Antiaircraft
Missile |
WANG Xiao-hu, CHEN Han-fu,
ZHANG Ming-lian |
By using the design method of the Linear
Quadratic Regulator, for pulse Doppler radar homing missile, a new optimal
law, which is of good adaptability，high precision and easy realization for attacking
maneuvering target is derived. To resolve the important key in engineering
application, an adaptive statistical model of target maneuvering is
proposed. Based on the statistical model of target maneuvering and
nonlinear Kalman filter, a new adaptive filter algorithm, which can
rapidly track and estimate maneuvering acceleration of the target, the
velocity and the distance between the missile and the target is proposed.
The simulation for a certain improved missile control and guide system
shows that the algorithm is stable and has good convergence property. |
| Research on Simulation and Evaluation of Faults of Armament Equipment Based on ADAMS |
JIA Chang-zhi, WANG Xing-gui,
CHEN Yong-cai, Xie Pu |
The significance of virtual prototyping and the steps
of modeling with ADAMS are introduced. the main faults of artillery are
classified and the main faults of recoil and counter-recoil mechanisms are
studied. ADAMS is first to be introduced into fault evaluation. With the
simulation module provided by Fortran language, virtual prototype of
artillery is established by using ADAMS, and the effects of faults on
firing performance of artillery are simulated. Finally, the perspective of
next work is presented. |
| Design
and Tests of Three Kinds of Simulation Systems for Ship Control |
REN Guang, NIU Jing-chao, YAN De-wen, ZHAO Wei-jun, JIA Xin-le |
There are three kinds of
simulation systems for ship control. The first kind is a single-computer
system and is the simplest one, which indicates that both a ship
mathematical model and the ship control strategy are simulated on a
computer. The second kind is a two-computer system, which means that a
ship mathematical model is simulated on one computer and a real ship
controller is operated separately, and a kind of communication channel
links the controller and the ship model. The third kind is a model ship
simulation system, which means that a model ship is built with contracted
size, and a real ship controller is mounted on the model ship. The model
ship being controlled by the ship controller is tested by sea trials. This
paper introduces the three kinds of simulation systems for ship control.
All of these three kinds of simulation systems have been built and tested
at the Ship Control Laboratory, Dalian Maritime University. |
| An
Investigation into Optimal Target Slip Ratio Control for Simulation of an
Anti-lock Braking System of Vehicles |
LI Jun, YU Fan,
ZHANG Jian-wu,
FENG Jin-zhi |
This paper presents a new control
scheme for an anti-lock braking system of vehicles, based on real-time
optimal target wheel slip ratio obtained according to the vehicle dynamic
state and road conditions. A fuzzy logic approach is applied to maintain
the optimal target slip ratio so that best compromise between
deceleration, steerability and directional stability can be obtained for
the vehicle. The scheme is implemented with eight DOFs (Degree-of-Freedom)
nonlinear vehicle model by using Matlab/Simulink software. Simulation
results show that the proposed the scheme is robust and superior in
improving vehicle performance to conventional one, which is based upon
fixed slip ratios, during cornering and lane changes. |
| A Global Convergent
Algorithm for Thermal Network Problems |
JI Hai-bo |
In
this paper we provide an iteration algorithm of global convergence for
thermal network problems. By avoiding the difficulties of stability of
conventional difference methods, our methods meet the demands of
convergence and real time in process simulation, and thus give a new idea
for the modeling and simulating of industrial process. A simulation
example is also illustrated to explain the algorithm. |
| Simulation
Study of a Novel Stator Structure of the Switched Reluctance Motor (SRM)
and Its Eletromagnetism Relations |
YU
Qing-guang, YANG Yu-gang |
A
novel stator structure of the switched reluctance motor (SRM) is proposed
in this paper. The basic electromagnetism relations of the SRM with a
novel stator structure are discussed, and its performances are computed
with the Finite Element Method (FEM). The results of the theoretic
analysis and the computation show that the SRM with a new stator structure
can make the torque ripple reduced, the starting capability enhanced and
the output torque increased. |
|
Method
of Control System Simulation Based on
Distributed
Control System |
HUANG
He-qing, YU Jin-shou |
The method of control system simulation based on Distributed Control
System is effective means. It can test the implementary correctness of
control system, the operating reliability of control system, the operating
equivalence of control system, the resource use of DCS and so on. The
period of the development of new control systems can effectively be
shortened and the risk in the phase of testing new control systems can
greatly be decreased by the method. In this paper, the necessity and
characteristics of control system simulation methods based on DCS are
analyzed and discussed, and the structure and categories of simulation
control system based on DCS are presented. A real example verifies the
correctness of the methods. |
| Methodology for Simulation for Fire Control System of Aerial Defense and
Its Battle Environment |
Li Jian, Hua
Zu-yao |
Fire control system of aerial defense and air raid are both oppose each
other and stimulative each other. If we want
to make our fire control system adapt to battle environment of future war,
we have to test performance for anti-jam of fire control system with
simulated battlefield that provided by our opposing equipment. Because of
complexity of fire control system and depending on battlefield, simulation
technology of DIS will bring into more and more important play. This text
recommends thought that simulates fire control system and it’s battle
environment with technology of DIS in brief. |
| Research
of Builder of Virtual Environment Based on VRML |
WANG
Ru-chuan, SUN Zhi-xin,
XIN
Chen-yun, GU Xiang |
Virtual Reality Modeling Language (VRML) can be applied to construct the
second generation WWW on Internet. However, because of its complexity, it
is difficult to construct 3D virtual space with VRML directly. If a
builder of virtual environment based on VRML can be designed and used,
efficiency will be improved greatly. This paper discusses some essential
problems of how to create the builder, then introduces an application
instance making use of the builder. |
| A Study on Dynamic Modeling of Strap Down Minehunting Sonar Array |
DENG Zhi-hong, LIU Sheng, LI
Dian-pu |
The dynamic models of strap-down minehunting sonar
array on moving base are established using the dynamics theory of rigid
body and the ship motion and modeling theory. Defining necessary
coordinates, we expressed the velocity and angular velocity vector of the
three shafts and the inertia matrix under the condition of parallel
displacement and rotating of the coordinates. According to the momentum
moment theorem the dynamic models of sonar array are carried out. At the
same time, the characteristics of the models are analyzed. The simulation
results indicate the correctness of the models. This gives the basis to
design the stabilizing control system with high precision. |
| The
Modeling and Simulation of Optimal Computer in Cold Continuous
Rolling Mill System |
CUI Jian-jiang, YUAN Feng-hua,
XU Xin-he |
This paper introduces a design and realization of the
simulation of optimal computer in cold continuous rolling mill system. The
methods of modular disassembling are applied to disassemble simulation prototype, and the methods of software
reengineering are applied in design and modeling of the simulation system,
which expands modeling methods. According to the abstraction for the setup
system, the simulation modeling multimodeling based on finite state
automata is established. |
| Application
of Discrete Event System Simulation to Cold Rolling Dynamic System |
Zhao Hui-ping, Pan Gang, Xu Xin-he |
The main topic of this paper is about discrete event
simulation in cold rolling process. We analyze the characters of discrete
event simulation in strip rolling process, and combine them with actual
questions of production process, then give a manner that how to deal with
diversiform event in cold rolling process. We classify the events
according to its specialty and sorts of operation objects, and then we fit
these classified events together and dispose them with optimization
method, so the efficiency of simulation system is improved greatly. |
| The Design and Realization of Database System for
Rolling Process Dynamic Simulation |
WU
Sheng-xi, YUAN Feng-hua, XU Xin-he |
In the paper, the importance and the framework of rolling process dynamic
simulation system are discussed and analyzed. The two database design
schemes (the framework of database system, client/server structure and
distributed database structure) of the simulation system are presented based on the
hardware structure, the function of database system and the special
requirements of the simulation system. And the two design schemes are
analyzed and compared. Active-database can provide the corresponding
information when events occur and conditions vary in the course of system
running. In this article, active-database design is used in the rolling
process simulation database system to resolve some important problems
relative with real-time control. Finally many key technologies and the
approaches during realization are discussed. |
| Study on ModelBase Technology and Its Application in System Simulation of Metallurgy of Iron and Steel |
YUAN Feng-hua,
CUI Jian-jiang, XU Xin-he |
Alerting to the requirement of system simulation and
the characteristic of modelbase, a hierarchy framework and corresponding
methods of modelbase management are designed. In order to offer a
convenient appliance environment of models in modelbase, the design idea
of Simulation Function Framework is proposed, and the design principle of
general Model Interface Template is given, which is referenced to the idea
of component, to simplify the applying process of models. At last, an
application example in metallurgy system simulation is provided, and the
feasibility and validity of the methods above are proved. |
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