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1999 Vol. 25, No. 5

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Analysis on Arrangement of Hybrid Composites Reinforced with Different Diameter Fibers
Zhang Zuoguang, Zhong Weihong, Zhang Daxing, Shi Weihua
1999, 25(5): 499-501.
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Abstract:
It mainly explored the hybrid model and mechanism of two kinds of hybrid composite materials reinforced with different diameter fibers which were composed of small-diameter fibers nested between large-diameter fibers in a matrix. T300 carbon fiber(CF), SiC fiber and boron fiber(BF) were used. Three ...
Half-Quantification of High Strength Aluminum Alloy's Corrosion Rank
Xie Weijie, Li Di, Hu Yanling, Guo Baolan
1999, 25(5): 502-504.
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Abstract:
Corrosion rank of high strength aluminum alloy in aircraft by visional inspection is a qualitative but simple method,while the most reliable parameter that reflects the corrosion of aluminum is the maximum corrosion depth.In order to make corrosion rank more reliable, corrosion rank and maximum corr...
GRECO Geometry Fitting by Using VC++4.0
Ning Huansheng, Gao Ying, Wang Baofa
1999, 25(5): 505-508.
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Abstract:
GERCO(Graphical Electromagnetic Computing) is recognized as one of the most valuable methods for computing the high-frequency RCS (Radar Cross Section). To the complex radar targets, in order to obtain a satisfying result, the target geometry fitting is an important work in applying the GRECO method...
Wavelet Transform-Based Approach for Interferometric SAR Image Noise Reduction
Yuan Yunneng, Hu Qingdong, Mao Shiyi
1999, 25(5): 509-512.
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Abstract:
Thermal and "Speckle" noise is an obstacle to obtain high accuracy phase in interferometric SAR images. According to the main sources of noise in interferogram, the noise character and the characteristics of interferometric SAR processing, biorthogonal wavelet transform with symmetry and compact sup...
Study of GPS/DR Integrated Navigation System for Vehicle
Zheng Pingfang, Chang Qing, Zhang Qishan
1999, 25(5): 513-516.
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Abstract:
The design of the GPS/DR integrated navigation system is presented and the main error sources which affect the GPS/DR system position accuracy are also analyzed. A mathematical model is founded to represent these main errors and an extended,iterated and federated Kalman filter algorithm is propounde...
RCS Computation of Low-Scattering Targets by Hybrid Method of\= GRECO and Traveling Wave Theory
Ning Huansheng, Jiang Xin, Wang Baofa
1999, 25(5): 517-520.
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Abstract:
GERCO(Graphical Electromagnetic Computing) is recognized as one of the most valuable methods of RCS computation for the high-frequency region. To the low RCS target, the effect of traveling wave is remarkable and larger than that of facets and wedges in some cases. This paper shows satisfying result...
Research and Development on Automatic Dependent Surveillance System Based on VHF Datalink
Zhang Xuejun, Qu Jianming, Zhang Qishan
1999, 25(5): 521-523.
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The basic concept, construction principle and implementation for the ADS(Automatic Dependent Surveillance) system are presented. The tracking precision is one of the most important factors of the practicality of ADS system. The outburst disturbance and the lose of ADS message and error code caused b...
Clock Synchronization Method and Performance Evaluation on a Class of Hybrid Systems
Cheng Changdong, Wen Chuanyuan
1999, 25(5): 524-526.
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Abstract:
During the simulation of a class of hybrid systems which consist of continuous systems, discrete event systems and inference decision systems, because the simulation of inference decision systems depends on other two systems, there are only different private simulation clocks between continuous syst...
Study of Task Assignment of Aircraft Onboard Machine-Electronic Equipment Control and Management Integrated
Li Yang, Wang Zhanlin, Qiu Lihua
1999, 25(5): 527-530.
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Abstract:
It's a trend that the aircraft onboard machine-electronic equipment is controlled and managed integrated by using the distributed processors and the network technology. How to assign the tasks of control and management to the distributed processors to balance the risk factor of system is the key tec...
Redundance Control of Servo Actuator System
Fu Yongling, Pei Zhongcai, Wang Zhanlin
1999, 25(5): 531-534.
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Abstract:
In order to improve the reliability of servo system, a triplex electro-hydraulic servo actuator system with three torque motors, three jet flapper valves and three sets of feedback components is designed. The authors make a deep theoretical analysis on the system, build up the mathematical model of ...
Feature Modeling for Aeroengine Blades According to STEP
Zhao Wei, Ma Mei
1999, 25(5): 535-538.
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Abstract:
Feature-based aeroengine blades design is researched in concurrent engineering environment. Based on the analysis of the basic features of various aeroengine blades, parametric feature modeling technology and object-oriented method, feature architecture of aeroengine blades,and a 3D solid blade feat...
Inflow Models in Trim and Dynamics Response of Helicopter
Yang Chao, Hong Guanxin
1999, 25(5): 539-542.
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Abstract:
For the current helicopter of single main rotor with tail rotor, the effect of inflow models with different characteristics on helicopter trim and digital simulation was discussed. Based on Pitt/Peters' first order dynamics nonuniform inflow model, the effect of uniform and nonuniform inflow models ...
Fuzzy Optimization of the Geometrical Parameters of Fighter Inlet
Li Jing, Li Tian, Wu Zhe
1999, 25(5): 543-545.
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Abstract:
For two-dimensional, two-shock, all-external compression, supersonic, cheek-type inlet, the integrated aerodynamic-stealth design of geometrical parameters, such as width, ratio of width and height, angle of vertical compressing ramp, two cutting bevels of the lip plane and lip-position-angle, was i...
Optimized Collocation of Combat Aircraft Weapon Systems for Air Force
Huang Jun, Wu Zhe, Zhu Rongchang
1999, 25(5): 546-549.
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Abstract:
The air force is one of the key elements in modern warfare and its main weapons are combat aircraft. Taking the campaign superiority parameter as objective function, a nonlinear programming for the combat aircraft weapon systems of air force was completed by using the complex method with constrains....
Probability Damage Tolerance Evaluation Method for Multi-Cracked Structure under Pre-corrosion
Zhang Jianyu, Zhao Libin, Fei Binjun
1999, 25(5): 550-553.
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Abstract:
For analyzing the aircraft structural reliability under bad parking conditions, probability damage tolerance evaluation method is established. This method is used to analyze the reliability of multi-crack structure considering the influence of pre-corrosion. This method comprehensively surveys the e...
Equal Damage Design Method for Fatigue Reliability Design of Structure
Xiong Junjiang
1999, 25(5): 554-557.
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Abstract:
The brief development course of fatigue reliability design is reviewed. The concept and principle of equal damage design for fatigue reliability design of structure are proposed. Then the test is carried out in order to validate this design principle, and it is indicated that the parts of a structur...
Transient Performances Calculation of a Gas-to-Gas Crossflow Heat Exchanger
Song Junxiao, Yuan Xiugan, Lin Guiping
1999, 25(5): 558-560.
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Abstract:
The dynamic performance of a single pass gas-to-gas crossflow heat exchanger with high speed air flow that is used in airplane has been calculated with both lumped parameter model and numeric method model. The calculation results under typical conditions of these two methods are very similar,but the...
Investigation into Shear Mechanical Properties of PUR Foamed Plastics
Lu Zixing, Xie Ruoze, Tian Changjin, Liu Xiaoping, Li Huaixiang
1999, 25(5): 561-564.
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Abstract:
The polyurethane rigid foamed plastics are important light structural materials. To investigate their shear mechanical properties is quite necessary for their applications.By the low speed torsional experiments of PUR foamed plastics, their shear mechanical behavior has been studied here. With these...
Computational Model of Progressive Failure in Composite Sandwich Structures
Zhang Zhimin, Li Jinqiu, Guo Yanyang
1999, 25(5): 565-568.
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Abstract:
Computational model of progressive failure in composite sandwich structures is built up to predict the face fracture,delamination failure and core failure. Nonlinear geometry equations and energy variational equation is estimated according to overall bulking of composite sandwich plates. The nonline...
Dynamic Characteristics Simulation of Aircraft Anti-Skid Braking System
Shi Peitao, Wu Reixiang, hang Xienian, Hu Fengwu
1999, 25(5): 569-572.
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Abstract:
Based on the dynamic response of aircraft body, the spring, damping of landing gears, friction characteristics of the tires,sensors, and so on,mechanical model for aircraft anti-skid braking system is set up.The model is simple but practical and universal,which is integrated with velocity-rate-contr...
Design of Switched-Capacitor Filters Using Signal-Flow Graphs and General Integrator
Cheng Daiwei, Fan Tianying
1999, 25(5): 573-576.
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Abstract:
A new design method of switched-capacitor low-pass filter using signal-flow graphs and the general integrator is presented. The method is of simplicity, clear physical concept and convenience for use . It can also be applied easily to the design of other kinds of SCF(Switched-Capacitor Filter)(e.g. ...
Research on Fitability in Precise Forming of Reflector Panels
Chen Xiao, Zhou Xianbin, Chang Hesheng
1999, 25(5): 577-580.
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Abstract:
In order to investigate the fitability in superprecise forming of double curvature panel based on "nails die and vacuum", the approximate generalized Fourier series solution is suggested for the bending problem of the rectangular thin plate supported at arbitrary points with large deflection. The so...
Experimental Investigation on Friction Coefficient of Ferromagnetic Flow with Applied Electric Fields
Zhu Runsheng, Zhang Jianbin, Wang Zhishan
1999, 25(5): 581-584.
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Abstract:
The frictional performance of steel-on-steel frictional pair under boundary lubrication with ferromagnetic flow added with additive and their friction coefficient by the action of applied electric fields are studied .The experimental results from the pin-on-disk tester show that the friction coeffic...
Investigation on CAD of Composite Materials Entire-Body Special-Shaped Component
Duan Hongjie, Yan Deyuan
1999, 25(5): 585-587.
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Abstract:
For entire-body special-shaped component such as multi-branch entire-body special-shaped hollow composite material tressel, the complex curved surface construction and continuity in laying fiber become obstacle in CAD. So block-modeling and grid-refining are used to control the direction of the surf...
Simulated Annealing Heuristic for Lot-Sizing Problem
Han Limin, Wang Fei, Feng Yuncheng
1999, 25(5): 588-591.
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Abstract:
The multi-item capacitated lot-sizing problem consists of determining the magnitude and the timing of some operations of durable results for several items in a finite number of processing periods so as to satisfy a known demand in each period. An approximation algorithm is described, which is based ...
Principal-Agent Analysis under Stock-Cooperation System
Gao Yuanyang, Chen Liangyou, Yuan Zhishan
1999, 25(5): 592-595.
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This paper introduces an important characteristic of the enterprises under the stock-cooperation system, i.e. the internalization of the principal, which means the employees of the enterprise are both principals and agents at the same time. This point is taken into the principal-agent analysis of th...
Complexity of Motions of Gyroscope
Hu Zhixing, Guan Keying
1999, 25(5): 596-600.
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The motions of a gravity symmetric gyroscope, whose outer ring's axis is placed horizontally, are dealt with. Firstly, the motions of a free gyroscope are studied and explained in the sense of mechanics under a certain condition. The Melnikov's methods and KAM theory can be used to study the motions...
Variable Structure Exponential Stabilization of Uncertain Nonholonomic Dynamic Systems
Wang Chaoli, Huo Wei, Dong Wenjie
1999, 25(5): 601-604.
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Abstract:
The chained form control system is a kind of canonical form of nonholonomic kinematic systems. Many nonholonomic kinematic systems can be transformed into this kind of form by coordinate and input transformations.Using variable structure control, a globally stabilizing controller is given directly b...
First-Order Second-Moment Reliability Method and Its Software
Zhang Jianguo
1999, 25(5): 605-606.
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The common software of the first-order second-moment reliability method is developed. It can be used to calculate the reliability of the non-linear function with normal, log-normal, extreme and truncated normal statistically dependent random variables. The calculation results show that this method i...
Research on Testability Allocation Method
Tian Zhong
1999, 25(5): 607-610.
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Abstract:
The relationship is studied between system testability index and the system element testability indexes,and the factors are analysed,which have influence on determining testability indexes.Then,the fundamental requirements,mathematical models and working procedure for testability allocation are deri...
Failure Model Effect Analysis Expert System
Zhao Tingdi
1999, 25(5): 611-614.
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Abstract:
The FMEAES(Failure Model Effect Analysis Expert System) that applies the artificial intelligent is introduced. It is established based on expert knowledge and function/hardware reasoning combined with fault simulation of the EDA(Electronic Design Automation) and supported by the reliability CAD and ...
Design and Implementation of Fast Motion Estimation Algorithm
Liu Dechun, Zhou Xiaokuan
1999, 25(5): 615-618.
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Abstract:
By sacrificing matching quality to reach higher matching speed is the common shortage of the published fast motion estimation algorithms.Based on the analysis of the strong and weak points of those motion estimation algorithms,a new fast motion estimation algorithm,using improved searching approach ...
Study on Fault Monitoring and Diagnosis Techniques for Thrust Chamber and Turbo-pump Systems of Liquid Rocket Engines
Yang Erfu, Zhang Zhenpeng, Cui Dingjun
1999, 25(5): 619-622.
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It is shown that most of the failures of liquid propellant rocket engines pressured by turbo pump systems take place at thrust chamber and turbo pump systems.A brief introduction to the study on fault monitoring and diagnosis techniques for thrust chamber and turbo-pump systems of liquid propellant ...

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