| Title |
Author |
Abstract |
| Computerized
Simulation on Flow Characteristics of Variable Displacementof Balanced
Vane Pump |
CHEN
Lei,
ZHANG Yin-dong, JI Yu-long, SUN Yu-qing, GUO Jing |
Based
on the study of the patent, the configuration and the action
principle of a new variable displacement of double-action vane pump is
discussed, which consists of floating blocks. The pump belongs to an
automotive hydraulic power steering system, and prosperous utilization is
expected. In the meantime, the
mathematical model for hydraulic power steering of automobile was
established. In addition the Matlab Simulink simulation model was
proposed. Different parameters of pump were selected in simulating
programming. The simulating results were analyzed and compared.
|
| Analyses
of Operational Effectiveness of Ocean
Surveillance Satellite |
SHEN
Ru-song,
ZHANG Yu-lin |
To
analyze operational effectiveness of ocean
surveillance satellite
system, the
probability of
identifying targets and the
precision of
locating targets were chosen
as operational
effectiveness indices
of the ocean
surveillance satellite system
which is composed of three satellites.
The
probability of identifying targets model was built, another
model built was the
location precision
model by
using
of measuring the time difference of arriving.
The simulation and analyses was carried out. The results demonstrate
that:
Ⅰ.making
use of the ocean
surveillance satellite can
find targets on ocean
effectively, but whether to
be able to
identify targets effectively depends on the knowledge about
targets characteristics;
Ⅱ.increasing
baseline length between the satellites rationally and maintaining
uniformity of the satellites formation configuration and their relative
position with target can improve the precision of locating target
effectively.
|
|
Research
on Damage Effectiveness of Rocket Intercepting Cruise Missile
|
ZHANG
Xue-feng,
WU
Ping,
LE
Gui-gao,
DING
Zhu,
PAN
Shu-shan
|
A
model of the damage probability of a certain rocket intercepting cruise
missile was established
and the corresponding simulated software was developed with Matlab
language. The damage probability under condition of multiple armament
datum firing and conventional concentration firing was computed
respectively by using the method of Monte-Carlo. The results show that
the conventional concentration firing system is higher damage probability
when target diffuse is lesser and on the contrary the multiple armament
datum firing system is higher damage probability. And this rocket can
damage cruise missile in high probability if the target can be shot
several times in its track. |
|
Modeling
of Loading and Unloading Scheduling SystemBased on Object-Oriented Timed
Petri Net
|
LIU
Tao, FU Wei-ping, WANG Wen, LI De-xin, XIE Jing |
An
Object-Oriented Timed Petri Net (OOTPN) was introduced to discuss the
problem about the loading and unloading scheduling system of automatic
storage/retrieval (AS/RS) modeling . At first, the scheduling elements
of the system were classified and abstracted, and the objected class
relation was obtained, then the Petri Net(PN) mapping
relation about the object class was established. Secondly, the
OOTPN model of AS/RS system was set up based on the PN relation. The
system model was discomposed into six models which communicated via
transitions. Token colors were properly defined so as to simplify the
model. At last, the deadlock problem of the model was analyzed. The model
is benefit to extended for it’s OO character and allows us to simulate
in program easily. |
|
Method
to Extend Attributes of Modeling and Simulating Entities
|
WANG
Chuan-peng,
LIANG Xiao-hui, XIE Ke
|
Entity
is the essential cell of the simulating system, and the main content of
modeling and simulating entity is attributes of entity.
By analyzing the problems in the modeling and simulating tools, a method
used expediently to model and simulate entity by each user was
proposed.The method resolved the problem of description and extending
attributes, and also the simulating programs using this method have
favorable transplantation and extendibility. The exactness of the
method was proved on the aspect of theory through data mapping and
semantic screening based on the entity conceptual model and simulating
system conceptual model. In addition, the feasibility of it was also
approved by application of the practical tools. |
| Modeling
Simulation Systemfor Oceanic Acoustic Information Engagement with UML
|
WANG
Xi-min, CAI Zhi-ming |
Underwater
warfare by Sonar is a key topic and major type of the oceanic acoustic
information engagement. Underwater
warfare simulation involving multi-targets and multi-sonars is an
important way to research sonar performance in the complicated
environment. Due to demands of the open frame and sophisticated feature, the simulation software was analyzed and designed by object-oriented
class model. The procedure of the design relied on UML. The product of
the design is well expansible and reusable. |
| Standard
Cell Placement AlgorithmBased on Adaptive Simulated Annealing |
NAN
Guo-fang, LI Min-qiang, KOU Ji-song
|
A
standard cell placement algorithm based on adaptive simulated annealing
was proposed.Due to characters of all circuits to be placed, adaptively
initial temperature and adaptive searching region were added to
traditional simulated annealing algorithm. At the same time, punishment
item in objective function was improved for standard cell placement
problem. This algorithm was applied to test a set of benchmark circuits,
and experiments show its advantages in placement results and time
performance by comparing with traditional simulated annealing algorithm. |
|
Simulation
Research of Blast Furnace Based on CFD
|
SHI
Yan-bin,
CHEN Ju-hua, ZHANG Li-li
|
Based
on the CFD(Computational
Fluid Dynamics) technology, a two dimensional mathematical
model of the blast furnace (BF) was built to simulate
ironmaking process, meanwhile the multiphase fluid motion and heat
transfer were considered. Phase of gas, liquid, particle and
fine were included in this model, as well as simple chemical
reactions. The model considered the coupling relationships of phases,
so every phase could change as the changes of other phase characters. The
steady velocity and temperature of per-phase described by numerical
calculation are very important for BF, especially the simulation
results of cohesive zone and raceway. The theory and model built here
provided a helpful try for BF simulation and a new method for guidance on
BF operation.
|
|
Research
on Trajectory Simulation of Air Targetin Situation Assessment System
|
SONG
Yuan, ZHANG Xin-hua, GUO Hui-dong, XU Lin-zhou
|
The
validity of target kinematics behavior analysis model depends on the
facility of target trajectory in situation assessment system. The
trajectory theory model of air target was made up according to its basic
rule of flight control. A stochastic difference equation to model the
air target movement in inertial frame coordinates was introduced.
A model with its statistical characteristics was dicussed in order to
reflect the statistical characteristics of air target. All the factor
that affected target trajectory and the control behavior of flight control
staff were considered. The simulation results show that the model can
reflect the kinematics behavior of air target and it can be applied in the
model test of situation assessment system. |
|
Fast
Algorithm for Data Association in Dense Clutter
|
Yuan
Gang-cai, WU Yong-qiang |
Joint
probabilistic data association is one of the most effective algorithms of
multiple target tracking in dense clutter. However, with the increment of
target tracked and the number of validation measurement, the computational
cost of association probability is the choke point in engineering
application. A fast algorithm was developed for data association based
on the principle of joint probabilistic data association. In this new
method, surveillance area was divided into independent area according to
the intersection area of association gate of targets tracked, after the
PDF value of the common measurements of targets and measurements lying in
a target association gate were weighted, and the association probability
of targets were computed. Without generating all the association
events, this algorithm is more efficient in engineering application.
Simulation results demonstrate the tracking performance of this algorithm
in different conditions. |
| Probabilistic
Data Association Algorithm Based on Techniquesfor Converting Measurements |
WANG
Wei,
LI Dan
|
In
tracking targets application with radar, target dynamics is usually
modeled in the Cartesian coordinates, while target measurements are
obtained in the original sensor coordinates. A
new approach named probabilistic data association algorithm based on
techniques for converting measurements was proposed.Filter estimate, error
covariance and probability of data association relative to the algorithm
were deduced, and new gating techniques for target tracking in clutters
were given. Monte Carlo simulation results indicate that new approach
is effective and feasible.
|
|
Support
Vector Machines Classifier Based on Modifying Kernel Function
|
FENG
Jun,
CHEN Zhi-jun,
LI Li-rong
|
Two
novel conformal transformations were proposed based on the Riemannian
geometry theory and S. Amari’s idea.
And the kernel function was modified by the transformation in a
data-dependent way. Our experimental results for the artificial nonlinear
data set show that the generalization performance of support vector
machines classifier is improved remarkably and the number of support
vectors is decreased greatly. |
|
Optimization
Study on K Value of Spatial
Clustering
|
LI
Yong-sen,
YANG Shan-lin,
MA Xi-jun,
HU Xiao-xuan,
CHEN Zeng-ming |
The
value of K is always confirmed
in advance to exert K-means
algorithm of spatial clustering. However, it can not be clearly and easily
confirmed in fact for its uncertainty. A
distance cost function was recommended. A corresponding math model was
set up and a new optimization
algorithm of K value was designed. A preliminary study on the
optimization of K value for spatial clustering was realized by a simulation design. |
|
Annealing
Evolutionary Programming Algorithm and Its Convergence
|
GAO
Yong-chao,
LI Qi-qiang
|
Selecting
pattern based on ranking in Evolutionary Programming Algorithm causes the
population’s searching space to become narrower and narrower to some
degree, which will result in premature convergence. To this problem, annealing
probability formation was introduced into the selection of EP and a
new algorithm: annealing EP (AEP) was got. Then the time-dependent
Markov chains were described and the convergence of AEP was proved. It
is proved that the algorithm always converges globally and the numerical
test shows that AEP can converge soon and it can better avoid premature
convergence and local optimum.
|
|
Synthesizing
Texture Using Variant SOM
|
XUE
Feng, ZHANG You-sheng, JIANG Ju-lang, HU Min,
WANG Jia-quan
|
A
technique for texture synthesis was outlined using variant Self-Organizing
Feature Maps (SOM). A new method of
SOM input vectors construction using corresponding gray image of input
texture was proposed in which the vector dimension length is 1/3 of that
in previous work of TSVQ method, then the SOM learning rule was extended
to train these input vectors. Then the quantized vectors to synthesis a
gray texture were used whose pixels could be finally mapped into a color
output texture. Experiments show that the quality of output of the
method is fine and the synthesis time can be remarkably reduced comparing
to TSVQ method.
|
|
Study
on Dynamic Clustering Analysis Method for Gene Expression DataBased
on Multidimension Pseudo F-statistics
|
LUO
Jia-wei,
LI Ren-fa, ZHANG Bai-ni
|
K-means
clustering analysis algorithm is a widely iterated
algorithm
in clustering analysis of gene expression data. In this algorithm, cluster
number is assumed to be K and iterated methods are employed to make the
value of objective function minimum. By doing so, the cluster result
improves very much. However K-means clustering analysis algorithm depends
on parameters strongly and the cluster number keeps unchanged.. Fake
F-statistic and an idea of adjusting cluster number were dynamically
introduced, and then a new dynamic K-means clustering algorithm for Genes expressed data was
proposed based on multi-dimension fake F-statistic. The experiment
results show that the algorithm can adjust cluster number and gain a prime
number of clustering, which thus argues that this algorithm can attain
better clustering quality. |
|
Fast
Identification Method
of Fuzzy
Neural NetworksBased
on Chebyshev Basis Function
|
JIANG
Shan-he,
ZHANG Jie |
The
theory of identification model based on neural
networks(NN)
is to research into its capability of nonlinear approximation. Universal
approximation capability of orthogonal polynomials based on NN was
proposed, and with which nonlinear approximation and global optimization
of this new type Chebyshev NN were proved. Then fuzzy
neural networks model
and learning algorithm based on Chebyshev
basis functions
to be used as its membership functions were proposed for nonlinear
system identification. As no
parameters to be adjusted in the Chebyshev
membership functions and just adopting BP algorithm studying parameters of
fuzzy rules, the computing greatly reduced and the simple
model structure、the
fast convergence and the high precision of identification were
obtained. The simulation results show their effectiveness of the proposed
model and method. |
|
MS-Based Study of
Fundamental Analysts Forcasting Behavior
|
PARK Jun
|
The
factors influencing fundamental analysts were analyzed during forcasting
stock price. The bounded rationality of security market participants and
constraints imposed by institutions were emphasized. The modling method is
MS(Microscopic Simulation), and the simulation results indicate that if
stocks worth investing and corporation has strong earning management
capability,even if fundamental analysts can figure out real earnings, they
will still use manipulated earnings to forecast stock price.
|
|
RTI
Benchmark Test for Virtual Simulation Environment
|
CHEN
Xin
|
The
Benchmark Test Index was designed based on the requirement of the
performances of RTI in the virtual simulation environment based on HLA.
The Test Index included the scale index of federation of the RTI support,
the latency index of an update or interaction between two federates, the
update throughput index between two or more federates, the time index
needed to advance time a specified number of units and the index above
the federate in the real load run time. The test method was designed
based on the designed index system. By analyzing the Benchmark Test result
data that adopted the different RTI and federate development method, such
as RTI architecture,
threading model and pack style of data to the performances of RTI, how
the different
technique impacted the performances of RTIwas got and
the techniques of real-time RTI were got that met to the distributed
virtual simulation environment. |
|
Design
and Implication of Attack and Defense Simulation Systemfor Ballistic
Missile with UML
|
QI
Zhao-hui, WANG Zu-yao, ZHANG Wei-hua, WU Qi-xing
|
The
distributing attack and defense simulation is an important means to
evaluate the combat effectiveness of ballistic missile. In allusion to the
typical attack and defense course of the ballistic missile, the components
and functions of the attack and defense weapons were analyzed. The use
case model, the structural model and the action model of the entities were
visually modeled. In addition, the attack and defense simulation system of
the ballistic missile was realized by the Microsoft visual c++ language. The
use case provesthat UML is an essential way to design the large-scale
simulation systems such as the attack and defense simulation of ballistic
missile. |
|
Design
of Hardware-in-the-Loop Simulation for Navigationand
Control Integrated System of Underwater Vehicle
|
ZHANG
Fu-bin, XU De-min, YAN Wei-sheng, GAO jian |
The
project of the hardware-in-the-loop simulation was proposed based on the
structure of the navigation and control integrated system for an
underwater vehicle.
Simulations are performed to indicate that the algorithm of the navigation
and control computer is correct; the
precision in computation can meet the using requirements; and the matching
capability of the hardware is good. The integrated systems of navigation
and control can be applied to the underwater vehicle. |
| Research
on Core Algorithms of Intelligent Virtual Design Methodfor Hydraulic
Integrated Systems |
FENG
Yi, TIAN Shu-jun, GAO Yan-ming, ZHANG Hong
|
Based
on the analysis of problems existed in the design of hydraulic integrated
systems, a new intelligent virtual
design method was proposed. With the virtual reality environment as
human-computer interface, the integrated layout and connection design
schemes of hydraulic manifold blocks were optimized using intelligent
optimization algorithms. The frame of intelligent virtual design systems
to solve this kind of restricted complex solid spacial layout problems was
introduced. The core algorithms, intelligent optimization approaches and
their hybrid strategies were discussed in detail. It offers theoretic
basis for building hydraulic
manifold blocks virtual design systems with high intelligence. |
|
An
Architecture Technical Reference Modelfor Large-scale Distributed
Simulation System
|
ZHAO
Xiao-rui,
GAO Xiao-guang
|
Much
more requirement is put for large-scale distributed simulation system
these years, but the research on its software architecture is still very
limited to support practical project. In
order to define and clarify main techniques and components of the system
architecture, a technique reference model (TRM) was introduced. The
TRM is developed in terms of a hierarchy of components: (1) Domains: the
TRM categorizes the designing work into four domains, including federated
simulation, simulation model, simulation node, and simulation network; (2)
Principles: principles address rationales for the TRM; (3) Technologies:
technical topics that are relevant to each domain and principle. The TRM
is supposed to be useful to refactory existing systems and develop next
generation of systems. |
|
Research
of SGE-based Distributed Simulation Grid Framework
|
ZHANG
Chuan-fu,
ZHA
Ya-bing,
LIU
Yun-sheng,
ZHANG
Tong |
Sun
Grid Engine (SGE) can be used to construct local and cluster grids. A
recent research of building SGE-based
distributed simulation grid framework
was proposed, where simulation grid could
execute HLA–based applications which were submitted to the grid by
simulation users. Time management of simulation grid and task migration
mechanism of simulation application were discussed. Further, checkpoint
approach was adopted to implement the migration and dynamic scheduling of
simulation task. The simulation grid framework supports the user-level and
kernel-level checkpoint of simulation task. Specifically, the framework
provides the dual channels of communication. Besides, the grid supports
two modes of HLA scheduling tasks, which are differentiated according to
processes and federates. Results
of this study demonstrate the technical feasibility of constructing SGE-based
simulation grid, and build a prototype system to execute HLA simulation
tasks.
|
|
Research
on Lookahead Problem in Parallel and Distributed Simulation
|
WANG
Xue-hui,
LI ge,
QIU Xiao-gang,
HUANG Ke-di
|
Recently,
there has been a great deal of interest in parallel and distributed
simulation, which runs on multiple processors to accelerate simulation. It
facilitates the research of large-scale complex dynamic systems, even to
explore far-ranging application spaces. However, time synchronization is
one of the important factors that affect the PDS running performance. The
conception of the lookahead and the method of its selection were
introduced, and then the formalized description of the lookahead was
provided. Moreover, the rollback
recurrence problem was researched that is likely to result from zero
lookahead, and also the solution and
the optimum strategy were put forward. Finally, on the basis of
discussing the effect of the
lookahead alteration, t a novel
lookahead dynamic update algorithm in RTI was designed. |
|
Data
Interactive Methods in Distributed Warfare Simulation
|
LIU
Jie,
BAI Yan-qi,
SUN Hai-tao |
The
data
interactive methods in DWS in recent years were summarized，which
are the PDU-based data interactive method and the publish-subscribe-based
data interactive method. Furthermore, the defects were pointed out in such
methods. Finally，a
new method called the mobile agent-based allodium abstracting data
interactive method was put forward,
and the main structure and the train of thought of the method were given
out. |
| Logging
and Replay in HLA-based Simulation System |
CHEN
Hong, ZHOU
Yi-qi,
YAN
Fa-yi |
The
architectures of data logging and replay in HLA-based simulation system
were analyzed. The scope and methods of simulation data logging during
federation execution were researched.
By storing simulation data into different tables in a database according
to the different object classes and interaction classes, the efficiency of
data searching was improved. Comparisons
were made between the methods of online replay and offline replay, and the
way of implementing online replay was presented in detail. According
to the methods of federates’ logical time advancement during excise, the
way for synchrony of federates during replay were proposed.
|
|
A
Novel Ring Topology Formation Protocol of Bluetooth Networksand Its
Simulations
|
FU
Bin,
LI
Ren-fa,
XIAO Xiong-ren
|
Based
on the characteristics of Bluetooth based ad hoc networks, a distributed
ring topology formation algorithm is proposed. The main idea is merging
nodes to forming a ring topology network that new nodes can join freely.
The protocol has the properties of less topology formation latency and
less control messages. The complexity of the control messages is
O(N).
It also forms a network with less piconets
number and lower nodes degree. It contains at most
piconets and at least
piconets. The maximum node
degree is 2. The experiments based on the NS2,
simulation
evaluates
the performance of the protocol, which validates the desirable features of
the ring Bluetooth networks. |
|
Research
on Simulation of Very High Frequency Data Link Network Mode 2
|
WANG
Xiao-lin, ZHANG Xue-jun, JIA Xu-guang
|
Results
of modeling and simulation of an aeronautical subnetwork, Very High
Frequency Data Link Mode 2(VDLM2), were proposed using OPNET Modeler.
Protocol modelers and simulation framework were developed successfully. The
simulation analyzed the network performance as throughput and peer-to-peer
delay influenced by application features and aircraft quantity, and
finally found the best network performance parameters.
|
|
Research
on Multibody Dynamics Simulation Model
Based
on Virtual Prototype Implemented by Component
|
WANG
Ting,
DING Guo-fu, ZHANG Wei-hua, YAN Kai-yin, XU Ming-heng
|
By
analyzing solving model characteristic of mechanical multibody dynamics, building
mechanical virtual prototype was studied based on component, at the same
time, building solving simulation model of multibody dynamics in MVC
design pattern was proposed. Separating solving logic from multibody
dynamics model, the
consistency of status of constraint and force element component was
achieved in multibody dynamics system simulation. Configuration of
component and simulation scheme in varies solving logic was optimized, and
make it was made concurrent developing and simulation convenient based on
component. Building mechanical virtual prototype in MVC simulation model
of multibody dynamics based on component, solution presented is
realizable. |
| Survey
on Key Techniques of Virtual Assembly |
ZHENG
Yi，NING
Ru-xin，LIU
Jian-hua，DU
Long
|
Virtual
Assembly, which is a key element of Virtual Manufacturing (VM), realizes
two levels mapping. The bottom
level mapping is from product physical model to product virtual model and
the top level mapping is from real physical assembly process to virtual
assembly simulation process. Virtual Assembly key techniques include:
collision detection, part modeling and data exchange/integration, assembly
planning, motion navigation and accurate location based on constraints,
deformable part assembly, knowledge extraction and application, assembly
evaluation and verification, et al. A survey on the present situation
of these techniques was proposed. The current deficits and the future
research trends were discussed and analyzed based on the survey. |
| Efficient
Inverse Image Warping Based on Spatial Continuity |
TANG
Yang,
WU
Hui-zhong,
XIAO Fu, XIAO Liang
|
As
one of the basic algorithms of image-based rendering, the inverse image
warping efficiently solves the problems caused by forward image warping,
however,it has the bottle-neck of low performance. A
novel inverse image warping method was proposed, which took the advantages
of the spatial continuity of the scene and reduced the searching length
from image’s size to stencil’s radius. Also, for those desired pixels
unfit for stencil cutting, another optimized way was described then. The
presented algorithm is simple and easy to be implemented, which can
enormously reduce the computation complexity and dramatically accelerate
the traditional methods through experiments. |
| Design
and Implement of Terrain &Object Simulationand Editing Visually Kit |
SHI
Song,
CHEN Chong-cheng, WANG Qin-Min, YAO Lin-qiang
|
errain
is the carrier of virtual environment, and it is also the groundwork of
constructing model in Synthetic Natural Environment (SNE). In SNE, the
goal of modeling is not only restoring environment elements truly such as
terrain but also constructing the multi-level interaction channels.
Editing and analysis is an important level of the channel. In the guidance
of this idea, a kit named TEVS was developed. At the same time, an
approach for editing and analyzing the model was explored. A division
of interaction behave levels between human and virtual environment was
presented. From low to high, They are data level, analysis level and
collaboration level in order. The non-sequence environment elements should
be organized sequentially and controllability in SNE. Human can
implement the interaction with virtual environment sequentially and
harmoniously on this base. |
| Simple
and Effective Simulation Algorithmfor Missile Flying Trail Fire |
MA Deng-wu，YE
Wen，DENG
Jian-qiu，QU
Xiao-yan
|
A
simple and effective simulation algorithm
for missile flying trail fire was proposed because
the calculative quantity and real-time capability are a great disadvantage
for the algorithm
based on traditional particle system. The algorithm
combined
particle system algorithm and texture mapping method by
making use of the fundamental of particle
system and creating texture map of the quadrangle.
The algorithm
reduced the
calculative quantity and promoted the real-time capability. |
| Simulation
of Changes of Gun Pressure Based on OpenGL |
WEI
Wei-bo,
RUI
Xiao-ting,
LIU Jun, YUN
Lai-feng, CHEN Tao
|
The
change process of gun pressure in the interior ballistics process was
analyzed, and the method of how to get the pressure data and the
process of how to fulfill the simulation with OpenGL step by step were
introduced, and then some simulation results were given. It is intuitive
to observe the change process of gun pressure with the simulation results.
|
|
A
Survey of Virtual Hairy Brush
|
MAO
Guo-hong,
ZHANG Jun-song, HE Xing-heng
|
Chinese
hairy brush does a very important role in inheriting the traditional
culture of China. Since Strassmann from MIT Media Laboratory proposed the
first hairy brush model in 1986, more and more researches have been
focused on the modeling of virtual hairy brush. These researches were
mainly on how to simulate the art effect and shape of the traditional
hairy brush. Most
of virtual brush models proposed in the latest 20 years were reviewed, and
several classical models such as Srassmann’s model, elastic
mechanics-based model, body-based model, physically-based model and pure
parameterized model were analysed in detail, and the thinking in these
models was summed up. Two corresponding issues to model the hairy brush,
namely the interaction between hairy brush and paper, and the simulation
of ink diffusion effect were also discussed. Subsequently, the future
developing directions concerned with the virtual hairy brush were
forecasted. |
|
Collision
Detection for Simulation Training Systemof Explosive Ordnance Disposal
|
DING
Wei-li，HAO
Ying-ming，ZHU
Feng，QIN
Li-juan，LIU
Xiao-min |
Efficient
and exact collision detection is very important to improve reality and
enhance immersion for virtual reality system, but limited collision
detection methods are provided by Vega. In order to improve real-time and
precision of collision detection, some new methods were developed such as setting
mask partly，loading
isectors dynamically，setting
isectors in some special parts where collision occurs frequently and
introducing distance gene.
The collision detection problems in Explosive
Ordnance Disposal
simulation training system were solved using these methods, and results
demonstrate methods’ effectiveness. |
|
Analysis
of First-order Fractal Fuzzy Filter in Time Series Process
|
OUYANG
Wen,
HE You, FANG
Wei |
First-order
fractal fuzzy control filter is a kind of adaptive filter, and it adjusts
its performance by changing control parameter according to the change of
fractal property of noisy signal, and can be used in time series
processing. The frequency-magnitude response of the fractal filter and the
change of fractal box dimension of white noise and color noise are
analyzed. The definition of short-time fractal box dimension and the fuzzy
control function of the filter are discussed. Simulation
results of a low frequency signal mixed with noise processed by the filter
show that the fuzzy control filter can enhance signal-to-noise ratio and
has less mean-square error than that of fixed filter; Nevertheless, the
oversimplified structure and the inaccurate application of the fractal
character of time series degrade the performance of the filter. The
improvement approaches as adoption of new architecture, multifractal
character of noise, neural network and table-looking methods in choosing
control function are presented at last. |
| Simulation
Study of Active ControlBased on Quadratic Stabilization Algorithm |
ZHANG
Wei-jing,
YAN Wei-ming, QIAN Jia-ru
|
The
application
of quadratic stabilization algorithm to civil engineering structures under
earthquake excitation
was proposed.
Two MDOF buildings with various control systems respectively under earth
excitation were analyzed
using this method. The simulation results show that not only is the
presented method effective in reducing the response quantities of the
seismic-excited buildings but the method is robust as well. |
|
Simulation
Analysis of the Non-isomorphic Configurationsfor a Novel Link-type
Reconfigurable Modular Robot
|
LIU
Jin-guo,
WANG Yue-chao, LI
Bin, MA Shu-gen
|
Reconfigurable
modular robot has various configurations to adapt to the environment and
the task. As the module increases, the non-isomorphic configurations
increase exponentially. A novel link-type reconfigurable modular robot has
been proposed and its module number can be chosen randomly. The relative
position of the adjacent modules can be changed through rotation of the
offset joints. The link-type structure is manually reconfigurable and can
shape shifting autonomously. Configuration matrices have
been proposed to represent the topology configurations of the
reconfigurable module robot. The robot’s configuration can be equivalently displayed in the simulation workspace.
According to combination principle, recursive algorithm has been
proposed to enumerate and decide the non-isomorphic configurations and
non-isomorphic symmetry configurations.
Four-module
and five-module robots’ symmetry configurations have been designed and
testified the simulation algorithm’s validity. |
| Speed
Estimation of Induction MachinesBased on Unscented
Kalman Filter |
LI
Jie,
ZHONG Yan-ru |
With
the aid of simulations, speed estimation of induction machines based on
the new member of the Kalman filter family —
Unscented Kalman Filter (UKF)
was discussed in depth. The effect of the
sampling time and the parameters of the filter upon the speed estimation
performances were analyzed, and the various aspects of the speed
estimation performances of the UKF, such as stationary error, dynamic
response speed, parameter sensitivities and algorithm complexity were
evaluated. And the comparison between the UKF and the classical EKF was
performed from every side. The simulation results show that the UKF can
not replace the EKF with the expected outstanding advantages for the speed
estimation of induction machines.
|
|
Adaptive
Algorithm of Learning Ratefor Feedforward Neural Network
|
LIU
Qiao-ge, FU Meng-yin,
DENG Zhi-hong
|
The
learning rate is an important parameter for the learning process of a
neural network (NN) which influents the stability and quickness of the NN.
An adaptive algorithm of learning rate was proposed which satisfied the
real-time requirement of the NN. The stability of the NN with such
learning rate was proved in Lyapunov stability sense. By adding an amending part to
the output of the NN to compensate, the influence of many unknown factors
on the learning error, the method to adapt the learning rate was
constructed, which could make the learning error converge quickly and
stably. Simulation
results show the efficiency of the algorithm. |
| Outdoor
Natural Environment Oriented Vision Simulation Systemof Mobile Robot |
ZHANG
Hao-feng, ZHAO Chun-xia,
WANG Xiao-li, LI Bai-yun, CHENG
Wei-ming, LIU Hua-jun |
Vision
based road following and navigation are important parts of intelligent
mobile robot. CCD Color Camera, Laser Radar, and Stereo Vision were
researched and simulated. CCD Camera was simulated through setting the
parameters of view volume in OpenGL, intercepting and saving the pixels of
the screen. Ray-tracing method was used to simulate the Laser Radar, and
by acquiring the data from the scene, Stereo Vision was simulated. The
system is able to simulate the acquired data of sensors truly when mobile
robot is moving. Using the data provided by the system, the algorithms of
fusion and plan modules were able to be designed. |
|
Composite
Control Strategy
Based on Shunting Model PIDand Robust
Compensative Controller
|
Zhang
Hui-di
,
Liu Shi-rong
, Simon X. Yang
|
A
novel composite
control strategy based
on a
shunting model PID and a
compensative controller
was
developed
for a
class of nonlinear
systems.
The proposed controller
has
some excellent characteristics, such as nonlinear filtering, gain
auto-regulation and robustness. Because the output of shunting
model
is stable, bounded and smooth, it is used to construct the PID controller
with bounded and smoothed output and gain auto-regulation. This kind of
controller can be employed in designing a class of safe
control systems.
The shunting model based PID controller is integrated with a robust
compensative controller so that it could effectively solve the robust
control problem for a class of nonlinear systems with parametric
uncertainty. By
the
simulation study of an
inverted pendulum
control, the
effectiveness of the proposed control strategy |
