|
Title |
Author |
Abstract |
|
Simulation
for Heat Transfer and Combustion in a Boiler Furnace
|
ZHANG Teng-fei, LUO
Rui, REN Ting-jin |
A
one-dimensional model was developed for the simulation of heat
transfer and combustion in a pulverized coal-fired boiler
furnace using the zone imaginary plane method (IPM). The furnace
was divided into several zones along the flue gas path, and the
combustion and radiative heat transfer in the burner and
burning-out regions were calculated using a lumped-parameter
method in the zones to simplify analysis for those complex
procedures. Formulations of effective emissive power for both
real surfaces and imaginary planes were derived and also
formulations of burn-off rate for pulverized coal were deducted.
One-dimensional temperature profile in the furnace was achieved
by solving the mass and energy conservation equations in each
zone，and
then the radiative heat transfer into water walls could be
calculated accordingly. The practical simulations by the model
were in good agreement with some predictions by other
three-dimensional models and some measured data, and could be
done in real time due to the simplicity of the model |
| Modeling
and Simulation of Double Armature Motor Speed System for 2030 Tandem Cold Rolling Mill
|
FANG
Yi-ming,
WANG Yi-qun, LU Jin-bo, JI Sheng-long |
Modeling
and simulation of the double armatures motor speed control
system for 2030 tandem cold rolling mill are predigested to that
of a single armature motor speed control system equivalently, so
the rapidity and real-time performance of the simulation for
tandem cold rolling mill are improved to some extent. Through
the detailed analysis and calculation, the model structure and
parameters of each tache of the dc motor speed control system
with field weakening and speed self-adjusting are obtained for
2030 tandem cold rolling mill. The simulation results show that
output response of the established speed control system is
consistent with the one from real spot, so it is demonstrated
that the established model for speed control system is accurate.
The model structure of the speed control system is complete and
it has great universality. |
| Systematic
Design and Simulation of Ship Fin Stabilizer Fuzzy Controllers |
XIU
Zhi-hong, REN Guang |
An
optimal design approach of TS-PID fuzzy controllers for ship fin
stabilizer control is proposed in this paper. TS-PID fuzzy
controllers are a class of T-S fuzzy controllers with PID
expression consequents. The interpolation model of a typical TS-PID
fuzzy controller is presented. It can be used to develop a fast
and precise control algorithm in application. By using the
passivity theorem, a sufficient condition for an IO stable TS-PID
fuzzy controller applied to ship fin stabilizer control has been
obtained. The optimal design procedure of a TS-PID fuzzy
controller for ship fin stabilizer control is also discussed in
detail by means of Genetic Algorithm. The simulation results of
a ship fin stabilizer control system show the advantages of TS-PID
fuzzy controllers. |
| The
Study of Simulation for Tracing Satellite Doppler Shift Using
Third- order
Phase-locked loop |
HAO
Xue-kun, MA Wen-feng, FANG Hua, MA Yi-fei |
In
order to implement precision measuring distance using PN code in
mobile satellite system, analyze the ability of high order phase
locked loop for tracing satellite Doppler shift, this paper
first deals with the analytic derivation of the satellite
Doppler shift, then presents the simulated results. In the
following, designs a third-order phased locked loop based on
second-order loop, investigates and simulates its performance of
capturing, time response, stability and error response, analyses
the rules of parameter selection and the ability of tracing
satellite Doppler shift. In the last of this paper numeric
realized frame of loop filter is presented. Result indicates
that measured distance error is limited about one in a thousand
in a PN chip by using third-order phased locked loop for tracing
satellite Doppler shift. It is demonstrated that it’s enough
to implement precision measuring distance. |
| Distributed
Circle Formation Algorithm for Multiple Mobile Robots |
MAO
Xiao-feng, CAO Zhi-qiang, TAN Min,
HUANG Lin |
A
circle formation algorithm for multiple mobile robots is
proposed in this paper. Multi-robot system is uniformly
distributed along the circle by iteratively adjusting each side
and the inner angle of the polygon if the number of robots is
not too much. Then, each robot will adjust its distance between
its position and the center of the circle according to the
desired radius. The effectiveness of the proposed algorithm is
verified by simulations. |
|
Application
of Feedback Linearization and Sliding Mode Control to AMT of
Vehicles |
SUN
Cheng-shun, ZHANG Jian-wu, CHENG Dong-sheng
|
An
investigation was made to the clutch engagement of automatic
mechanical transmission (AMT) systems for automobiles during
start-up, and further for the control purpose a dynamic system
and control model was proposed according to the characteristics
of the clutch engagement. By means of the feedback linearization
procedure of differential geometry, an equivalent, fully
controllable and linear model was derived via a homomorphic
transformation and a sliding mode controller was constructed for
the AMT clutch system. Computer simulation results showed better
tracking accuracy, rapider response, and stronger robustness by
sliding mode controller than by PID controller. |
|
Research
on Discrete-time Adaptive Control of Electrode Regulator System
of Arc Furnace
|
LIU
Xiao-he, ZHANG Dao-cheng |
In
this paper, the discrete-time adaptive control of electrode
regulator system of arc furnace is discussed. First, the
nonlinear function relation that is between arc length and arc
current of arc furnace main circuit is expressed with
piecewise-linear function, and then a piecewise-linear model of
electrode regulator system is presented. Based on this the
design of arc furnace electrode regulator adaptive control
system is made, the rule of discrete-time model reference
adaptive control is proven. The results of simulation show that
adaptive control has favorable tracking characteristic and
capability of restraining dithering, and that the performance of
adaptive system is much better than PID control system. The
research provides a new method for developing new type electrode
control system. |
|
Sequential
Probabilistic Simulation to Security and Economics of Power
Systems |
LI
Sheng-hu, DING Ming
|
The
secure and economic operation of power systems is very important
to the development of our country. Probabilistic models of
electric equipment are discussed in the paper. A Monte-Carlo
probabilistic sampling based on sequential simulation is adopted
to simulate the operation of power systems and the random outage
of electric equipments. The operation parameter is optimized
with a linear programming algorithm to reduce the load
curtailment. Security indices based on load curtailment and
economic indices based on generation cost are presented and
illustrated by the results of IEEE-14 test system. As an
auxiliary decision tool, the simulation software is helpful to
quantitatively evaluate the property of power systems and is
useful in electric engineering dispatching and planning. |
|
The
Simulation Study of Electric Vehicle Driven by Permanent Magnet
Synchronous Motor System
|
XU
Yan-liang, TANG Ren-yuan
|
The
mathematics model of electric vehicle(EV) driven by permanent
magnet synchronous motor (PMSM) is founded, on the basis of
which, the simulation program is completed, and the performance
simulation of developing EV is done including the start and
acceleration, stable running, speed-variable running and so on.
It is verified that the EV employs a good performance when
driven by PMSM. |
| Crawling
Feasibility Simulation Study On Tracked
Vehicle
For Deep Ocean Mining |
WANG
Zhen-yu,
LIU Shao-jun, LI Li |
Tracked
vehicle platform as the operation platform of the deep-sea
mining collector sub-system crawls on the deep-sea sediment. The
feasibility of its crawling on the deep-sea soft soil in Chinese
deep-ocean mining area is discussed. A new modeling approach
Adams Tracked vehicle (ATV) is used to construct the multi-body
system model of the tracked vehicle, a special tracked vehicle
crawling on the seabed for deep ocean mining. The dynamic
analysis software ADAMS/Solver is used to analyze the simulation
of the tracked vehicle crawling on the four kinds of virtual
seabed terrains respectively, and the simulation results
basically tally with the real experimental data. The motion
performance of the tracked vehicle is proven to be satisfactory.
The new modeling and simulating method is also proven to be an
efficient way to modeling a tracked vehicle and to simulating
its dynamical performances. |
| Application
of Neural Networks for Design of Control System of the Simulator |
SONG
Shen-min,
CHEN Xing-lin, DUAN Guang-ren, ZHANG Song-bo |
In
this paper, for the nonlinearity and time variable parameters
characteristic of the middle frame electrohydraulic servo system
of three-axle flight simulator and the speediness request, a new
approach of single nerve cell PID model reference adaptive
control design with parallel structure is addressed. The middle
frame plant is approximated by Neural Networks and single nerve
cell is adopted as the controller. The simulation results show
that this approach satisfies the speediness request of simulator
and has good robustness. |
| Study
of Tracking Differentiator on Filtering |
WU
Li-qiang LIN Hao HAN Jing-qing |
In
this paper, some results of tracking differentiator(TD) on
filtering are presented. By virtue of the filtered signals and
their differentiated signals, the phase delays produced after
being filtered are compensated by predicting. Some simulation
examples prove that the initial signals can be better recovered
by the method of TD and predicting. In a practical example, a
good result is obtained by the adoption of step-varying TD and
predicting under the condition of sampled signal with noise and
sampled time varying. |
| Application
of Decision Trees Learning in RoboCup Simulator League |
YANG
Zeng-guang，LI
Long-shu |
The
learning approaches based on Decision Tree are discussed and a
training algorithm for the “Action Choosing Ability” of the
agents in the RoboCup Simulator League is presented in this
paper. It makes the agent can determine the next action
according to the current status in the field. As an example,
this paper uses this approach to make the agents acquire the ability
of judging whether or not they can shoot successfully at present
state and determine their next action if they can’t shoot. |
| Research
on Aircraft Rudder Motor Servo Loading System |
ZOU
Hai-feng, SUN Li, YAN Jie |
Servo
loading system (SLS) is an important simulation system in
hardware-in-loop flight simulation laboratory, which can
simulate aerodynamic loads acting on the rudders of aircraft. To
meet the demands to develop the current EHSLS (Electro-hydraulic
servo loading system) into MSLS (Motor servo loading system) and
to improve the system’s performances, some
basic technical problems about
MSLS in theory and application are studied in this paper. First,
the MSLS’ s mathematical model is established. Then, digital
simulation and analyses about the system are carried out. By
analyzing the simulation results about the system, the
conclusions are reached that adding of speed compensation and
acceleration compensation in MSLS can further improve the
system’s performances to some extent so as to satisfy the
requirements of applications. |
|
Motion
Modeling and Software System Design for CAS-Glove Data Glove |
FU
Yu-jin, YUAN Kui, ZHU Hai-bing, DU Qing-xiu
|
Data
glove is a kind of very important and current input-device in
virtual reality (VR) system. In this paper, a new pattern of
data glove named CAS-Glove is introduced. Then a modified
finger- motion model is deduced in the following according to
both the restriction of fingers and the sensors’ peculiarity
and laying-out in CAS-Glove. Finally, the components of the
software system, which cooperates with CAS-Glove, as well as its
main function, utilitarian calibration method and data
processing course, are explained in detail. |
|
Simulation
System of Billet Reheating Furnace
|
BI Chun-chang, LI Ning, HUANG Dao |
Based
on the study of billet heating grid difference model and energy
distribution model, a billet reheating furnace simulation
system, by which all key parameters of furnace can be
calculated, is designed and fulfilled in this paper. This system
can be used either off-line to simulate furnace’s running
status or online to monitor furnace’s real-time control.
Consideration of different varieties of furnace structure and
fuel during design phase makes this simulation system versatile
and practical in engineering. The comparison between simulation
results and engineering data indicates that above system can
simulate billet reheating furnace’s running status with high
precision. |
| Software
Environment and Application of dSPACE Real-Time Simulation
Platform |
MA
Pei-bei WU Jin-hua JI Jun XU Xin-lin
|
From
a certain angle, the development of hardware-in-the-loop
simulation (HILS) represents the whole science and
technology’s strength for a country. This
paper introduces mainly dSPACE Real-Time simulation platform and
its software environment which includes RTI and ControlDesk. It
expatiates on the developing steps of control system which based
on dSPACE. It is more convenient,
efficient and accurate than traditional methods; By right
of the base, we design HILS of
anti-ship missile. The results prove that the HIL
experiment is successful. |
|
A
Nonlinear Spectral Analysis Based Fault Forecasting Method and
Its Application |
ZHANG
Hua-jun, HAN Chong-zhao
|
An
identification arithmetic for the generalized frequency response
function (GFRF) is modified firstly in this paper to improve the
accuracy and robustness of this identification method, and then,
a fault forecasting method based on nonlinear spectral
analysis is proposed and is applied into the fault forecasting
of certain helicopter’s electric rudders. Many times of
experiments indicate that this fault forecasting method is
effective in fault forecasting. The feature of this fault
forecasting method is that the arithmetic of this method is
simple and that no heavy computation is needed. This
characteristic makes this method suitable for online fault
forecasting. And this fault foresting method supplies a new
solution to the fault forecasting of a large class of nonlinear
systems and has a broad prospect for practical application. |
|
An
Improved WCDMA Downlink Receive Algorithm and Its Simulation
Realization
|
ZHOU
Li-sha, ZHONG Bing, SHEN Min
|
The
paper deeply studies the procedure of WCDMA Downlink receiver
and describes the fundamentals of DS-CDMA receiver. After
comparing and analyzing some algorithms, and utilizing the
statistic characteristics and approximate-relation of received
signals and considering the realization complexity and
computation, we propose an improved WCDMA downlink receive
algorithm with high practical value. Simulation results have
proven that the algorithm has perfect performance. |
| The
Application of Design Patterns in Communication System
Simulation Software
|
WANG
Cong, ZHOU Sheng-jun, JIANG Guang-jie
|
Simulating
and modeling are the best technologies for evaluating the big
and complex system performance. The design of the simulating
software is the key to the problem. Today, the best way for
developing the complex system is software engineering, and
design patterns have become an essential tool in software
engineering. This paper provides a method on using the design
patterns, the software engineering technologies, to improve the
reliability, security, usability and maintainability of the
simulating software. |
| An
Analysis of the Characteristics of High-speed Network Traffic
Based on Simulation
|
MA
Wei-min,
LI
Zhong-cheng,
WANG
Jun-feng,
XIE Gao-gang
|
The
characteristics of network traffic are vital for network
engineering and the study of network
performance. Based on the theory of self-similarity, the
evolution process of the self-similarity characteristics with
the load increasing on backbone link is studied. The experiment
shows that the self-similarity of backbone traffic retains when
multiple self-similar branch traffics are multiplexed together.
The degree of self-similarity of backbone traffic is smaller
than the ones of each branch traffic, especially under high
throughput. The changes of the sizes of sending window of TCP
can cause the variation of the self-similarity. |
| The
Algorithm and Simulations for the Asynchronous Track Association
|
ZHU
Hong-yan, HAN Chong-zhao, HAN Hong, ZUO Dong-guang
|
In
the distributed multi-sensor multi-target information fusion
system, the local sensors usually provide the respective tracks
at the different rates with different communication delays. An
asynchronous track-to-track association method is developed in
this paper. Firstly, the fusion of the single sensor at time
domain is accomplished by means of the Least Mean Square (LMS)
algorithm. As a result of the fusion, the asynchronous tracks
are synchronized. Secondly, multi-sensor local track combination
from the same target is obtained by means of network
optimization method. The simulation results indicate that the
presented method can solve effectively the asynchronous
track-to-track association problem. |
| Research
on Application of Neural Network in Light-Wave Guide Coupler
|
LI
Jiu-sheng, BAO Zhen-wu
|
Neural
network is used to model the light wave-guide coupler, which is
in turn analyzed, designed and optimized through the model. The
distance between two wave-guides and coupling coefficient is
defined as the input and output sample respectively, which are
used to train the neural network. In the range of training,
the coupling coefficient at any arbitrary of the distance
between two wave-guides can be obtained easily and quickly.
Compared the output of network model with the numerical value
calculation of electromagnetism field, the error is less than
1%. This method has the advantages of reliability, accuracy, and
time saving, which are identified by simulation. Therefore, this
way promises well in both fields of investigation and
application. |
| A
Dynamic Simulation Platform for Transform Domain Communication
System
|
HE
Zhi-qing, REN Hui
|
TDCS
(transform domain communication system) is a recently proposed
communication system. A dynamic simulation platform for (TDCS)
is designed in this paper. The platform can be used to develop,
simulate and evaluate the processing algorithms, such as
adaptive transform domain filter and time-frequency joint
analysis. Another important function of the platform is to carry
out the evaluation of the dynamic performance of the system. A
TDCS using wavelet transform is analyzed on the platform and the
results indicate that the TDCS has LPI characteristic and strong
anti-NBI ability. |
|
Study
of Distributed Mining Association Rules Based on Meta-learn
Technology
|
ZHANG
Ji-fu, ZHENG Lian, SHI Hong, YAO Shu-ping
|
Mining
association rules is an important task of data mining. In this
paper, a method and algorithm DMAR of distributed mining
association rules is presented in distributed transaction
database by using meta-learn technology. The algorithm has
higher efficiency of mining and lower amount of communication.
Distributed factor g is defined for measuring efficiency of
mining algorithm, and it is pointed out that mining efficiency
and data communication amount is related to g value. In the end,
algorithm DMAR is proven to be correct and effective by
experiment. |
|
Research
on Technology in Sea bottom Terrain Match
|
LIU
Zhun, SI Wen-fang, CHEN Zhe
|
Terrain
matching algorithm for underwater navigation is studied. Two
algorithms are simulated with underwater digital map
respectively. And the effect of sensor noise on matching
probability is also analyzed in batch of simulation experiments.
The result shows that when the mean root square of sensor noise
is less than 10m, TERCOM algorithm can achieve matching
probability of 90%, while the CEP of SITAN is 60~70 meters. |
|
Modeling
and Simulation of Trace with Scan Radar System
|
TIAN
Hui, ZHANG Lin-rang, SUN Xiao-wen
|
The
modeling and simulation for a radar signal processing system
with system simulation tools can make it possible to complete
its performance evaluation, scheme reasoning, and so on with
economy, convenience and high-efficiency. In this way, the high
reliability of system design, correctness and optimal
performance of products can be guaranteed. This way also can
shorten designing period and reduce development cost. Taking
trace with scan radar system as example, here the digital
simulation system has been constructed and it includes the
production of radar target return signal, fraudulent jam and
clutter. It also includes searching, achieving of distance,
velocity and angle, scanning of target signal, and precision
analysis of distance, velocity and angle. |
|
High
Level Architecture Based Muti-agent Simulation Model In Tank
Element Confronting Simulation
|
CHEN
Yan-biao, LI Zhi-gang, HUANG Jian-ming, ZHANG Shao-feng
|
Based
on the difficulties in face of the confronting simulation,
combined with complexity of the military confronting simulation,
this paper studies the tank element confronting simulation using
the agent-based modeling method of complex system analysis and
design, and under the technology frame of HLA proposes a new way
to organize the muti-agent system. This method combines the
priority of the HLA and the muti-agent modeling method, and is a
affective way to construct the tank element confronting
simulation. The research in the paper also studies the structure
of the tank agent, constructs an agent based confronting
simulation model of tank element under the technology frame of
HLA, and gives its implementation scheme of the tank agent using
the object-oriented method. The study of high level architecture
based muti-agent simulation system will be a very important
aspect of the military simulation research in the future. |
|
Study
on Optical Channel in Visual Simulation System and Its
Realization
|
TAO Tang-fei, HAN Chong-zhao
|
This
paper studies the key technologies of multiple vision channels
in visual simulation system, and the result shows that it can
increase the immersion of visual simulation when used correctly.
Based on the needs of this type of system, “optical channel”
is proposed, the relation of the focus and view field is
concluded according to the principles of imaging and the
function of adjusting focus is realized. The implementation of
this method is simple and it runs very fast, and can meet the
real-time request of simulation. The research has large value
and good prospect in project. |
| Forecast-tracking
Control of Attitude Maneuver of Spacecraft Based on
Tracking-filter
|
ZHAO
Jian-kang, YIN Qiu-yan, DAI Jin-hai
|
This
paper concerns attitude control for large angle rapid maneuver
of spacecraft. Based on dynamics model of spacecraft, it
discusses a kind of strong tracking filter that has strong
applicability to tracking maneuver of spacecraft, a model of
one-step forecast when spacecraft has no control. And it also
discusses a forecast-tracking control algorithm for attitude
maneuver of spacecraft. Simulation results show that attitude
maneuver converges rapidly by using forecast-tracking control
technique. |
| Configuration
Modeling and Simulation of Aircraft Liquid Cooling System Based
on Flow Chart
|
NAN
Guo-peng, WANG Jun
|
Base
on the research of the Liquid Cooling System (LCS) of one
domestic fighter, mathematical models of the main components are
set up with the thermodynamics theory. Meanwhile, a
configuration graphics simulation software (LCS-1.0) of LCS
based on the flow chart has been developed with the
object-oriented program concept on VC++6.0 Integrated Developing
Platform (IDP). It makes up the disadvantages of ground test
conditions and facilitates the analysis of steady and dynamic
performance of LCS. An example analyses the performance of LCS
of a certain fighter in our country, and the calculated values
are in consistent with the test results. |
| Design
of Simulation Environment for Weapon System Development
|
QIU
Xiao-gang,
HUANG Ke-di
|
The
occurrence of HLA (High-Level Architecture) has provided the new
technical infrastructure for weapon system argumentation. To
make full use of HLA to service the weapon system argumentation,
a department needs to design the simulation environment on the whole. On the principle of reuse, this
article puts forward a scheme about an advanced distributed
simulation technique frame, of which HLA is the core. The frame
centers on the simulation resource library and builds the
simulation environment composed of federation development,
run-time infrastructure, demonstration, control management,
analysis and estimation. By this environment we can quickly get
all sorts of distributed simulation application systems. |
| The
Simulation Research of FCS Upper-level Supervision and Control
System for Ball Miller Control in Power Plant
|
LIANG
Geng,
BAI Yan, LI Wen
|
The
control scheme for the upper-level supervision and control
system for ball miller control in power plant is elaborated and
the result of off-line simulation is provided. The necessity of
real-time simulation to control of the upper-level supervision
and control system is expounded, the method and procedure for
the implementation of the real-time simulation scheme are
elaborated, the result of real-time simulation also provided and
the significance of the simulation to the upper-level
supervision and control system in designing and developing
control system is advanced. |
| Design
and Implementation of Underwater Vehicle Integrated Distributed
Interactive Simulation Environment
|
KANG
Feng-ju, SU Ying, YAN
jin-tun, CAI Bin, MA Yu-min
|
Underwater
vehicle distributed interactive simulation environment based on
LAN, is designed using integrated simulation method. Special
communication PDU format based on winsock2.0 is developed, and
simulation database based on SQL Server is designed. Based on
this environment, submarine-surfaceship, surfaceship-submarine
multiple weapon platforms combat simulation systems were
implemented. The environment has advantages as follows:
integration of modeling, experimenting and results analyzing;
parameters on models and random errors could be set, modified
and saved by friendly user interface, and could reiterate
simulations to implement statistical analysis function. This
system has been applied in the assessment of tactical
performance of underwater vehicle. |
|
Dynamic
Simulation of Bootstrap Air Cycle Refrigeration Components for
Aircraft Environmental Control System
|
HE Jun, ZHAO Jing-quan, SUN Wei
|
The
working principle of a bootstrap air cycle refrigeration
components is described in detail, such as compressor, turbine,
shaft and internal heat exchanger. Based on the performance maps
of compressor and turbine, the nonlinear dynamic mathematical
models of system are set up. According to the principle of time
scale, the dynamic process of airflow pressure, temperature and
shaft rotational speed are considered respectively. Using
software MATLAB/SIMULINK, the air cycle refrigeration dynamic
simulation toolbox for aircraft environmental control system is
established with module structure. A typical example of steady
simulation result and dynamic process analysis is given in this
paper. |
| Research
on System of Model Base Management Based on PDM Technology
|
SONG
Xiao,
LI
Bo-hu,
CHAI Xu-dong
|
In
the cooperated simulation platform of Virtual Prototype (VP), to
manage the models, documents, data generated in the development
and running of platform is the main function of the system of
model base .In this paper, based on an aeronautics virtual
prototype project, the status and effect of model base system in
the VP project are illustrated. Model base system based on PDM
technology is introduced, the interface between project
management platform and model base system is discussed. |
|
Geometry
Simulation of NC Machining Based on Blending Octree Model
|
WU
Hong,
DU
Jian-ming,
YUN
Min
|
The
data structure of blending octree model is introduced into
geometry simulation algorithm of NC machining in this paper, and
the surface boundary information is added into this kind of
simple hierarchical data structure. The method used in
converting CSG model or B-rep model of part to corresponded
blending octree data structure is described, and by means of
blending octree model the geometry simulation process is
implemented. Finally, the feasibility and validity of the is
algorithm proposed in this paper is validated through geometry
simulation of one part’s NC machining. |
|
A
Real-Time Rendering Method of Large Scale Terrain
|
LI
Hui, ZHAI Lei, LIN Cheng-kai, PAN Jin-gui
|
The
3D visualization of terrain has been widely used in various
fields. In this paper, we present a method for real-time
rendering of large scale terrain data, by combining together
several methods such as block processing of terrain data, LOD
technique, view frustum culling and ROAM method. This new method
implements real-time, continuous LOD rendering, and employs
frame coherence to greatly improve the rendering speed and has
gained a satisfactory rendering result. |
|
Stereo
and Multi-screen Visualization of STL Models
|
LANG
Xing-hua, GUO Yang, LIN Heng, ZHANG Wei
|
A
PC-based multi-channel STL model display system is introduced.
Firstly, the coordination information of triangle facets and
their vectors in STL model file is extracted. The vertex
coordinate and vector data are then processed to solve the
redundancy problem of STL model and to make the model look
smooth. Stereo display of the processed model is achieved
through programming with OpenGL functions in software and
realized through a polarized dual-projector system.
Multi-channel display is based on LAN network synchronization.
With Spaceball adopted in the system, natural manipulation of
STL model for both position and orientation is realized. As a
low-cost virtual reality system, the proposed method will
possibly be applied in various research and development fields. |
| Advances
in the Study of Nanometric Cutting by Molecular Dynamics
Simulation
|
TANG Yu-lan, LIANG Ying-chun, CHENG Kai
|
The
basic principles of molecular dynamics and the potential
functions used in nanomachining were introduced. Cutting
mechanism of brittle materials and ductile materials, tool
geometry, tool wear and the relation of macro-cutting mechanism
and micro-cutting in the field of nanomachining by molecular
dynamics simulation were reviewed. Several problems on the study
of nanomachining at the present time are pointed out. The better
proposals on the future study of nanomachining are put forward. |
| A
Visibility Algorithm Based on Subdivision of View Angle
|
PAN
Zhi-geng,
FU Guo-liang,
WANG Yi-gang
|
This
paper presents a visibility preprocessing algorithm for 3D
scene, which is suitable for the occasion that the moving path
of viewpoint is given. We use a subdivision of the cube which is
corresponding to every orientation, to process the visibility by
means of the light volume, and to calculate a conservative
potentially visible set for a given path. The proposed method
could efficiently cull the small objects which are occluded by
other large objects, so the number of potentially visible
objects on each viewpoint are much less than the number of
objects in the entire scene, and it can improve the speed of
rendering scene for it avoids rendering the invisible objects. |
| The
Analysis of Projection Error in Ship Handling Simulator |
LAN
Pei-zhen, JIN Yi-cheng, QIU Zhi-xiong, ZHOU Wei-bing |
In
this paper, the authors analyze the cylinder screen projection
in the visual system of ship handling simulator, build the model
of the cylinder screen perspective projection, and correct the
errors of perspective projection. Also a detailed analysis of
the biggest error incurred by the perspective projection is
presented in this paper. The result of the analysis shows that
the error correction made meets the requirements of visual
system in ship handling simulator. |
| Study
on Dynamic Constructing and Real-time Rendering of the
Multiresolution
Terrain Model
|
LIU
Jian-yong,
WANG
Yuan,
LU Yun, XU Ji-heng
|
This
paper presents a dynamic construction algorithm for the
multi-resolution terrain model based on the large scale GRID
data or discrete elevation data. We calculate the field of
vision following the theory of three dimensional perspective projections. In the field of vision, the hierarchical
triangulated irregular network (HTIN) is constructed through
hexa-splitting of triangle, which is determined with three
criterion: the complexity of terrain, the position of view point
and the orientation relation between terrain tile and the line
of sight. The HTIN is organized by quad-tree which includes
trinary tree node. This algorithm optimizes the shape of HTIN
and improves the efficiency of constructing. The experiment
results show that this algorithm can achieve good performance
both on the quality of landscape and on the speed of the
rendering. |
| Research
on Multi-Agent Modeling of Virtual Environment in Beverage-
Packaging
Production Line
|
ZOU
Xiang-jun, SUN Jian, HE Han-wu
|
By
analyzing virtual environment’s features and modeling method
of beverage packaging production line, a new multi-agent
modeling method is proposed in this paper, which divides the
complex production line system into spatial net relationship of
main agent and subagent. The sextuple is defined in the main
agent structure. The message processing mechanism is adopted to
describe the behavior of virtual production line system dynamic
entity. The whole framework of multi-agent system is built up by
the method. Based on WTK and VC++, an effective software called
simulation system of virtual beverage-packaging production line
is developed. The result of the application shows that the
system is of practicability and validity. It provides the
enterprise an integrated tool for the design of technological
solid layout, optimizing, decision-making, evaluation of
manufacturability for key equipment. |
| Research
on a
Soft Real-time Scheduling Algorithm Based on the Adaptive
Control Structure
|
WEI
Li-feng,
YU Hai-bin
|
It
is heavily limited that only the conventional control approaches
are mainly adopted to resolve soft real-time system scheduling
problems. Aiming at the time-varying characteristic of CPU
resource real-time scheduling model, this paper presents a soft
real-time scheduling algorithm based on the adaptive feedback
control structure. This algorithm identifies the time-varying
parameters of the model by online identification. The controller
parameters are revised automatically.
The control system runs at the expected pole of the closed loop.
The robust is demonstrated when the system parameter is varied，and
its steady and dynamic response performances are improved. The
utilization of resource is increased. |
|
A
Novel Fuzzy Adaptive Backstepping Scheme for Nonlinear Systems
|
LI
Ya-hui, QIANG Sheng, LIU Guo-zhong, ZHUANG Xian-yi |
