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2002 Vol. 28, No. 1

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Effects of Roughness Ribs on Flow Patterns of Simplified Aircraft Model
WANG Jin-jun, XUE Qi-zhi, WANG Hai-wen, LI Yan
2002, 28(1): 1-3.
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Abstract:
The dye-injection flow visualization technique has been used to study the flow patterns of a simplified aircraft model, the effects of side roughness ribs and "O" type with side roughness ribs on the flow patterns have been observed in details. The experimental results indicated that the range of th...
Improved Solvable Condition for H∞ Control Problem via State Feedback
ZENG Jian-ping, CHENG Peng, ZHANG Li-jun
2002, 28(1): 4-7.
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Abstract:
Simplified solvable condition for H∞ control problem via state feedback is considered. The solvability of H∞ control problem via state feedback is considered to be equivalent to that of a class of linear matrix inequality (LMI). It can reduce the variable dimension by deleting redundancy matrix vari...
Nonisothermal Adsorption Model for Molecular Sieve Oxygen Concentrator(MSOC)
YANG Feng, LIN Gui-ping, ZHAO Jing-quan
2002, 28(1): 8-11.
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Abstract:
The operating principle of the OnBoard Oxygen Generating System (OBOGS) and the basic theory of enriching oxygen with Pressure Swing Adsorption (PSA) are briefly introduced. A nonisothermal adsorption model to simulate the dynamic PSA process has been established with consideration of the factors of...
Design and Implementation of Certain SelfAdapted Telemetry Frame Synchronizer
KUANG Wei, ZHANG Xiao-lin, TAN Shuang
2002, 28(1): 12-16.
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Abstract:
This self-adapted telemetry frame synchronizer is designed for certain UAV , which telemetry-data frame-format is altering with different working modes. This frame synchronizer is controlled by software, so its parameters can be adjusted on real time to adapt various frame-formats. After that , EPRO...
Scheme of Secure Telemetry Data Transmitting System Using in Certain UAV System
KUANG Wei, ZHANG Xiao-lin, HU Yi
2002, 28(1): 17-20.
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Abstract:
The scheme of secure telemetry data transmitting system using in certain UAV system is discussed here. This encryption not only has strong security, but also can be easy realized, with few error-spreading and no message-spreading. Thinking of the error correction coding technique in this telemetry d...
Modelling and Fuzzy VariableStructure Control of Agile Missile
DONG Chao-yang, SHI Xiao-rong, ZHANG Ming-lian
2002, 28(1): 21-24.
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Abstract:
Advanced agile missiles possess maneuverability, agility and accurate guidance performance by adopting thruster vector control or reaction control system thruster. System dynamics and modelling of the advanced agile missiles is investigated, a variable-structure model-following control approach for ...
Optimized Design of Environmental Control System for Aircraft Avionics Pods
YU Jian-zu, YU Lei
2002, 28(1): 25-29.
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The status of development of the technology of environmental control system(ECS) for avionics pods was introduced, a new type re-cool reverse boot-strap ram air circle cooling scheme of ECS for pods was brought forward. The optimum design mathematical models of typical ECS for pods were created, and...
Fatigue Life Corrective Factor of Wing-Main-Beam under Corrosive Condition
LI Yu-hai, LIU Wen-ting, JIANG Dong-bin, JIANG Jun
2002, 28(1): 30-33.
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Accelerated corrosion tests of simulator specimens of the wing main beam of a kind of fighter plane are carried out for different times which correspond to different years of the plan on grounding, before fatigue test are carried out under load spectrum. By analysis of test data, the curve of ground...
Study and Implementation of Software Reliability Prediction Method
CONG Min, LU Min-yan, BAI Yun-feng
2002, 28(1): 34-38.
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Software-reliability evaluation can estimate and predict reliabilities of software . For the purpose of solving the problems in software prediction process, a practical software-reliability prediction method is proposed to give better software reliability predictions. In this method, a model is sele...
Dynamic Characteristics Analysis of Rotor System Whole Transfer Coefficient Method
HONG Jie, HAN Ji-bin, ZHU Zi-gen
2002, 28(1): 39-42.
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Abstract:
Whole Transfer Coefficient Method (WTCM), which was investigated and presented on the basis of Transfer Coefficient Method (TCM), is a new method of dynamic characteristics analysis of rotor system. In dynamic characteristics analysis of coupled multi-rotor system, it has many advantages, good enoug...
MATLAB Simulation Model of Environmental Control System
SONG Jun-xiao, YUAN Xiu
2002, 28(1): 43-46.
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Abstract:
MATLAB is applied to the dynamic simulation of the environmental control system (ECS) of military aircraft. Modeling method of cooling and controlling parts is introduced respectively based on MATLAB. A toolbox for the simulation of the environment control system is then developed. An example of the...
On Scatter Factors of Fatigue Life Obeying Different Distributions
HE Xiao-fan, LIU Wen-ting
2002, 28(1): 47-49.
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Abstract:
The fatigue life of civil aircraft structures obeys two-parameter Weibull distribution,its scatter factor is significantly different from that obeys logarithm-normal distribution .To analyze the difference and relation of these two scatter factors,the scatter factor formulas of fatigue life which ob...
Differential GPS Reference Station Design Based on OEM
DING Sheng-xi, ZHANG Qi-shan
2002, 28(1): 50-53.
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Abstract:
The DGPS positioning model is introduced and the RTCM SC-104 message content is described. The design scheme of the DGPS reference station based on cheap GPS-OEM is proposed. This kind of DGPS reference station is composed of GPS-OEM and microprocessor. The general GPS receiver only can receive the ...
On Manipulability Based Fault Tolerant Measure of Redundant Robot
LI Jian, LI Jian-feng, WU Zhen, ZHANG Qi-xian
2002, 28(1): 54-57.
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Abstract:
When a redundant manipulator suffers a joint failure, its dexterity will be significantly affected. A joint failure may result in a singular configuration even if the manipulator operates in a relatively dexterous configuration, as a result, the manipulator can't perform arbitrary end effector motio...
Research on Wedge Type Torsional Vibrator
CHEN Zhi-tong, ZHANG De-yuan
2002, 28(1): 58-62.
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Abstract:
To solve the big bulk, high cost and short life span problem of current vibration tapping and reaming system , and to promote application of the high performance vibration tapping and reaming technology, they proposed a wedge type torsional vibrator, which is of much smaller pressure angle, more com...
Analysis of Stress Intensity Factor of Interfacial Crack in TBC
YANG Xiao-guang, LIU Liu
2002, 28(1): 63-65.
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Abstract:
The local collocation technique was used to evaluate the stress intensity factor of the interfacial crack. Combined with finite element method, it is used to compute the stress intensity factor of the interfacial crack between the ceramic coating and bond coating of thermal barrier coating under ten...
Identifying Human Pilot Model in TwoAxis Control Task
QU Xiang-ju, TAN Wen-qian
2002, 28(1): 66-69.
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Abstract:
A simplified methodology is described for identifying human pilot describing function in a two-axis control task. A real time simulation is carried out on simulator, in which pilot tracts the command velocity and pitch angle of aircraft by controlling the stick and throttle respectively. Coherence f...
Fast Route Planning Algorithm for Vehicle Location and Navigation Systems
PENG Fei, LIU Zhong-kan, ZHANG Qi-shan
2002, 28(1): 70-73.
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Abstract:
Route planning is widely recognized to be a critical issue in the field of vehicle navigation. By examining fast route planning algorithms used in vehicle location and navigation systems,a high-efficient implementation method of shortest-path searching algorithm was proposed in this paper,which is r...
Approximate Function Based Mathematical Modeling in Material Corrosion
DENG Yang-chen, LI Zheng-neng, ZHANG Yi-ning, CHENG Ji-wei
2002, 28(1): 74-77.
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Abstract:
The approximate function was led to mathematical modeling in material corrosion. By the characteristic of corrosion data, the divisional mathematical modeling concept was proposed. And it was compared with three models, which were gray model, dynamic data & bi-directional difference model and po...
Simulation of Direct Torque Control System of Induction Motors Using MATLAB
GUO Hong, WANG Guang
2002, 28(1): 78-81.
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A simulation method of direct torque control system of induction motor is presented, based on MATLAB. After discussing the configuration and working style of the direct torque control system, a simulation method, which is able to analyze the characteristic of the whole system, is proposed, based on ...
Dynamic Design of Structures Based on Kind of Inverse Generalized Eigenvalue Problem for Matrices
LI Shu, SUN Zhong-kai, ZHANG Fang, XIANG Jin-wu
2002, 28(1): 82-85.
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Abstract:
The stiffness matrix and mass matrix are considered as nonlinear functions of certain parameters such as the areas of cross section of the members. In this paper, a method of structural design of dynamic model is presented and the solving criterion is also given. A first, the problem is treated as a...
Independent Initial Alignment of Marine Strapdown Inertial Navigation System in Moorage
ZHOU Li, CUI Zhong
2002, 28(1): 86-89.
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Abstract:
A method of independent initial alignment of a marine strapdown inertial navigation system in moorage is studied to arm at the problems which are brought by a base swinging with large angles and centripetal-acceleration disturbance on the base. Parameter identification is used to pick-up the several...
High Speed and Accurate "E-T" Translation Method for Transient Aerodynamic Heating Control System
WU Da, HE Xiao, GAO Zhen
2002, 28(1): 90-93.
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Abstract:
To simulate the transient aerodynamic heating condition of high speed flight vehicle, the high speed and accurate computer transient control system must be used to realize the high speed nonlinear dynamic controlling in the heating process of aerodynamic simulation experiment. To reach this aim, a v...
Iterative Method for Hypersonic Non Equilibrium Flows
WANG Hao, WU Song-ping, LU Ye
2002, 28(1): 94-97.
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Abstract:
An iterative method based on the implicit TVD schemes of Harten-Yee's type is presented for the full Navier-Stokes equations with chemical source terms. Only the inviscid part of the implicit scheme is updated in every iteration, it makes the iterative algorithm convenient and economical.Numerical t...
Investigation on Distribution and Variable Rule for Corrosion Depth of Aluminum Alloy Specimen
LI Yu-hai, HE Xiao-fan, CHEN Qun-zhi, LIU Wen-ting
2002, 28(1): 98-101.
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Based on the experiment for LY12CZ aluminum alloy stimulator specimen under the typical service atmosphere and accelerated simulator environment in laboratory,which is usually used in making aircraft skin structures,the viewpoint of corrosion damage can be described by the corrosion depth is clarifi...
Equivalent Kt Method for Evaluating Fatigue Properties of Titanium Alloy Welding Specimens
WANG Xiang-ming, LIU Wen-ting, WANG Zhong-bo
2002, 28(1): 102-104.
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With regard to the Titanium alloy welding structures generally used in advanced aircraft structures,an equivalent theoretical stress concentration coefficient Kt (Kte) was introduced to describe the fatigue property of welding specimen. On the basis of the fatigue properties of Titanium alloy specim...
Structural Function Failure Probability Control Method for Service Life Estimation
LIU Xiao-dong, LIU Wen-ting
2002, 28(1): 105-108.
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Abstract:
Notions of probability of structural function failure, probability of function failure for one aircraft and probability of function failure for a fleet are presented. Based on the binomial distribution, a calculating model of structural function failure probability for a durability critical componen...
Accelerated Corrosion Environmental Spectrums for Testing Surface Coatings of Critical Areas of Flight Aircraft Structures
LIU Wen, LI Yu, CHEN Qun, HE Xiao
2002, 28(1): 109-112.
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An accelerated corrosion environmental spectrum was introduced to test the surface coatings of the critical areas of flight aircraft structures. The spectrum is composed of hot-humid environment、ultraviolet radiation、thermal impingement、low temperature fatigue and salt spray. One single cycle of the...
Research on Life Reliability of Fatigue Crack Propagation
LUO Yi, HUANG Pei-yan, LIU Wen-ting
2002, 28(1): 113-115.
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By analyzing stochastic of effects on the fatigue crack propagation life, a few models on life reliability of fatigue crack propagation in common use were compared. On the base, a kind of reliability model, so called the reliability model of fatigue crack propagation life corresponding to fracture t...
Prediction of Surface Fatigue Crack Growth Lives of Structures under Bending Loads at Elevated Temperature
HUANG Pei-yan, LUO Yi, FEI Bin-jun
2002, 28(1): 116-118.
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Based on an empirical J-integral equation proposed earlier, surface fatigue crack growth rates along crack length and depth directions including the J-integral were developed. Using these expressions, the crack growth lives of a SUS304 steel at 550℃ under bending loads are predicted. The fatigue cra...
Fuel Measurement with Attitude Error Correction by Using CAD Technique
YUAN Mei, WU Hao, ZHANG Jian
2002, 28(1): 119-121.
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Abstract:
In order to measure aircraft fuel in any attitude, a real-time fuel measuring method based on CAD technique is presented. First, adopting 3D solid modeling technique, the model of fuel tank of some aircraft is established. The measurement principle with attitude error correction and the structure of...
Development of Scanning Frame System for Compact Antenna Test Range Measurements
HU Chun-hua, FAN Rui, CHEN Wu-yi
2002, 28(1): 122-124.
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Compact antenna test range (CATR) is a system which simulate the far-field electromagnetic environment in a smaller microwave dark room to measure and research diversiform antennas. Its ultimate performance criterion must be gauged with scanning frame. Based on the principal of compact antenna test ...

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