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The effect of different modeling design on temperature field of headlamp was studied. Numerical simulation of internal temperature field of headlamp was performed and temperature distributing rules were summarized. On those bases, a fast analytical model of temperature field of headlamp was presented considering flow field around the automobile. Taking one headlamp modeling design for example, numerical...
By analyzing the five zang-organs' system functions and their relationships, the paper implements the formal function classification and description based on the Agent modeling of complex systems, and establishes the simulation functional model of Traditional Chinese Medicine's five zang-organs. The model consists of five separate agents which simulate five zang-organs of human body system. The relationships...
In previous literature, most researches about auto-focusing technique have based on stationary object. This paper studies the moving target focusing based on image definition. This paper analyzes the image processing frame rate, image delay, focusing step how influence focusing speed and definition and establish the simulation model. Focusing system based on image definition criterion is designed...
The concept and technological composition of aircraft assembling process oriented assembly field is presented, its key technologies are explored respectively, the assembling process database is built based on Oracle system, the method and the procedure of assembling process simulation and optimization are formulated, and the visualization technology concerned with all kinds of assembling process information...
Aero-dynamic characteristics are one of the most important main performance indexes of motor vehicles, which is determinative to car-body final shape. Car-body integer optimization of aero-dynamic characteristics is a way to reduce air drag and improve operation stability. The method, confirming ideal basic body and then achieving perfect car-body shape, is a practical application in modern industrial...
Analysis of Emission in airport terminal area is a key to emission control and environmental impact evaluation, and it also can instruct airport construction and air traffic management. Current emission models have disadvantage such as accuracy and applicability, a new model of emission calculation and a method for emission analysis based on flight procedure operating simulation are proposed and used...
Thunderstorm downbursts are major cause of concern for engineering structures both on ground as well as those in air, namely aircrafts. The wind velocity profile of a thunderstorm downburst-induced wind is significantly different compared to natural atmospheric boundary layer winds. As a type of high intensity winds, thunderstorm microbursts have caused numerous structural failures around the world...
One of the most important problems of airplane infrared simulation is to establish the simulation model accurately based on real-time status. This paper analyses the three main sources of infrared signatures in airplane: airplane-skin, nozzle components and exhaust plume. By reckoning environment radiation, aerodynamic heating, heat transferring and hot engine casing principle, a synthetic simulation...
Atmospheric correction can eliminate radiation distortion of remote sensing images caused by atmospheric effects and is the basis of data processing for dynamic monitoring of quantitative indicators. In this paper, 6S and FLAASH based on radiation transfer model are applied to atmospheric correction of SPOT4 image. Judging from the results of correction, atmospheric correction can obtain features...
There are many concave-convex defects in the finite element mesh model structure of composite materials after the layer optimal design. Aimed at this kind of defect, this paper proposed an algorithm which defined a serial of specific recognition rules according to analysis of defect attributes, matched the finite element models with concave-convex defects recursively, and finally recognized all defects,...
Water column is produced by explosive near free surface, which is quite intriguing. The forming process and characteristics of water column are investigated numerically by DYNA code. 1kg RDX explosive is initiated underwater, meanwhile gravity and hydrostatic pressure are all taken into account. The velocity vector analysis shows that the center of water column obtained higher velocity, which makes...
According to the application background of detecting the content of three-dimensional carbon in the city atmosphere, we study the Aerospace Sensor Networks Detection Based on Virtual Multi-antenna to improve the detection accuracy. Aerospace Sensor Networks Detection Based on Virtual Multi-antenna fuses the diversity technology, and forms the distributed Virtual multi-antenna system to overcome the...
Currently combustion and emission performance of diesel engine under transient conditions has become the researching focus. It's full of research challenges because of highly variability of engine operations and complexity of chemical reactions. A simulation platform of turbocharged diesel engine with EGR (exhaust gas recirculation) loop under transient conditions, based on the software coupling technique...
Based on the qualitative analysis and research of implementing Reduce Vertical Separation Minimum (RVSM) to enhance the flight capacity in RVSM airspace all over the world, using systemic approaches that combine the qualitative analysis with ration analysis, this paper introduced mathematic description and neural network model of the air traffic issue in RVSM airspace. The mathematic description is...
A new method for global nonlinear aerodynamic model identification is presented. Aerodynamic model of aircraft is analyzed, and a simple and effective aerodynamic model is presented. The aerodynamic model of aircraft is then depicted in NARMAX (Nonlinear Auto Regressive Moving Average model with eXogenous inputs) form inside a Linear Regression framework. The items and coefficients of the aerodynamic...
Firstly, an air passenger capacity investigation at the capital international airport is made, and a composite forecasting model based on total air passenger capacity is established, in which multiple regression and ARIMA model are parallel connection and their forecast results are series connection with BP neural network. Secondly, according to the average growth rate of air passenger capacity, all...
Over the last twenty years, our understanding of how software systems can be developed as product lines has improved significantly. However, there has been little progress towards a wider goal of product lines that are usable across disparate application domains. We present a new formalism, a Nature Diagram, to address this issue. This representation allows the characteristics (both data structures...
Measuring the attitude of an aircraft model in wind tunnel accurately is one way to improve the accuracy of wind tunnel experiment results. This paper investigates a stereo vision-based attitude measurement system for aircraft model in wind tunnel. To measure the attitude of an aircraft model, a cooperative object mounted on the aircraft model is firstly used to generate two bidirectional collimated...
This paper introduces methods of several transformation matrixs in filight simulation on digital Earth. Use these methods and use double-precision matrix, avoiding the calculation of the simulation engine, the error caused by an error caused by simulation results, to better meet the design requirements.
The paper provides test platform design and implementation for BOM-based simulation model tests, to enhance the model reliability, and shorten simulation system integration cycle in the test. It designs independent model test platform, which provided object management, data distribution, time management and other services needed by the BOM model running. The model test platform could provide runtime...
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