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1999 Vol. 25, No. 2

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Analysis on Phase Gradient Algorithm in DiscreteDomain and Implementation
Li Liwei, Mao Shiyi
1999, 25(2): 125-129.
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Usual autofocus techniques are based on low order phase error model, and they can only estimate low order phase error, therefore they can not be fit for high resolution airborne SAR(Synthetic Aperture Radar). The PGA(Phase Gradient Autofocus) presented in this paper is uniquely not phase-error-model...
Wavelet Analysis Theory and Application in Radar Signal Processing
Wang Zulin, Zhou Yinqing
1999, 25(2): 130-133.
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According to the features of signal to be processed, the wavelet transform is compared with short-time Fourier transform. It indicates that the wavelet transform is suitable for the processing of nonstationary and singular signal. The continuous wavelet transform, discrete wavelet transform and wave...
Control Strategy and Implementation for Acquiring and Tracking GPS Signal
Sun Li, Wang Yinfeng, He Chuan, Zhang Qishan
1999, 25(2): 134-137.
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A control strategy of acquisition and tracking for code loop and carrier loop is designed to detect GPS signal. Sequential searching scheme and narrow space non-coherent digital delay locked loop assure reliable acquisition and precise tracking for code phase. Integrated algorithms of 4-quadrant fre...
μ-Analysis and DFP Optimization Method of μ-Synthesis for Flight Control System
Zhang Lijun, Cheng Peng
1999, 25(2): 138-141.
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Because the result of the classical control system design is not unique,there are more than one result that satisfies the required performance.So a design result with good robust stability is selected by structured singular value analysis.This result could be regarded as a multi-target design which ...
Analysis and Calculation of the Rotation Induced Voltage of Brushless DC Motors
Guo Hong, Wu Kai, Wang Guoliang
1999, 25(2): 142-145.
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The general calculation formulas of the rotation induced voltage of brushless DC motors are deduced systematically. Based on these formulas, the effect on the rotation induced voltage caused by the flat top width of air-gap magnetic density, the distributed winding, the short pitched winding, the fr...
Formal Verification of Hybrid System
Gao Jianping, Chen Zongji
1999, 25(2): 146-150.
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As a case study of hybrid system, a redundancy management system in flight control system is formally investigated and its specification and verification are presented using an approach incorporating program logic into duration calculi. Firstly, the requirement with some assumptions is captured in d...
Research on Mechanism of Imitating-Human Intelligent Control Triple-Inverted Pendulum
Zhang Feizhou, Chen Weiji, Shen Chengzhi
1999, 25(2): 151-155.
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Based on the mechanism of acrobatic erecting poles, this paper makes use of phase plane method and human controlling experience, puts forward an obvious imitating-human intelligent control method used to control one stage inverted-pendulum which combines qualitative analysis and quantitative estimat...
Robust Detection in Multisensor Data Fusion
Su Huimin, Zhang Minglian
1999, 25(2): 156-159.
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Robust detection problem is presented in this paper. The design of optimal decision rules in detection problems requires the knowledge of the conditional probability distributions of the observations given by each hypothesis. In many applications, however, the probability distributions are not speci...
Posterior Ellipsoids Conditional Filtering Method of Stochastic System
Wu Sentang
1999, 25(2): 160-162.
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In the case of unknown control vectors, unknown distribution and parameters of system state and that of stochastic interference existing in stochastic system, based on posterior ellipsoids approximation principle, an ellipsoids conditional filtering method of stochastic system is developed in this...
Theoretical Analysis of a Kind of Hydraulic Active Filter
Li Yunhua, Jiao Zongxia, Wang Zhanlin
1999, 25(2): 163-166.
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Aiming at the problems existing in traditional passive hydraulic filter, a concept of hydraulic filter with active control is presented. Based on its simple operation principle, the theoretical analysis for a kind of active control hydraulic filter with static pressure balance and variable chamber, ...
Experiment Study on Combined Fatigue of Turbine Disc Fir-tree　Slots at Elevated Temperature
Hou Guicang, Wang Rongqiao, Yan Xiaojun, Nie Jingxu
1999, 25(2): 167-170.
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Based on a practical problem of the teeth crack breakdown of a turbine disc at elevated temperature, an experiment and theoretical study on L-HCCF (Low and High Cycle Combined Fatigue) of fir-tree slot is carried out.The major cause of the fracture is the interreaction of high and low cycle fatigue....
Analysis of Active Aeroelastic Wing Technology
Yang Chao, Chen Guibin, Zou Congqing
1999, 25(2): 171-175.
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Based on aerosevorelasticity technology, active aeroelastic wing technology (also called active flexible wing technology) was discussed. Active aeroelastic wing technology was advanced technology of aircraft design to improve performance from a lot of cases. The main design concept and characteristi...
Numerical Analysis of Optimal Control on Composite Plate Deformation
Fang Youliang, Wu Zhe
1999, 25(2): 176-179.
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Kirchoff hypothesis is applied to laminate plate with induced strain actuators. Piezoelectric patch is bonded to its surface or embedded within the laminate. Using plate element, FEM(Finite Element Method) for laminate plate with induced strain actuators is proposed. Considering the control matrix, ...
Waverider Configuration Design
Wang Zhuo, Qian Yiji
1999, 25(2): 180-183.
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The computation of generating waverider configurations using the theories of conical flow field,OC(Osculating Cone) and OA (Osculating Axisymmetric) flows are presented. Investigation shows that the method of using conical flow field theory is relatively simple and the lift-to-drag ratio of the conf...
Methods for Estimating Parameters in Random Model ofFatigue Multi-Crack Propagation
Zhang Jianyu, Fei Binjun, Zhao Libin
1999, 25(2): 184-187.
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Methods, which are used to evaluate correlation parameters in fatigue multi-crack propagation random model using test data, were established. Taking advantage of the existed single-crack propagation test data, the parameter estimation method was established by using non-complete test data for analyz...
Reliability Analysis Models for Multi-Crack Structure
Zhang Jianyu, Fei Binjun, Zhao Libin
1999, 25(2): 188-191.
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Reliability analysis models for multi-crack structure are established in this paper. These models are based on the FMPRM(Fatigue Multi-crack Propagation Random Model) and can be used to evaluate the multi-crack structural reliability. The structural reliability is the probability that the multivaria...
Optimum Association of Difference Schemes
Zhuang Damin, Yuan Xiugan
1999, 25(2): 192-196.
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The selection of the finite difference schemes for the convective and diffusion terms of the governing equations of fluid flow has great influence on the computational stability, accuracy and time. In this paper, various combinations of difference schemes, including Central difference, Up-wind, Hybr...
Analysis on Evaluation Method of Handling Qualities of Pilot and Aircraft System
Xu Zhongxiang, Qu Xiangju
1999, 25(2): 197-200.
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The closed-loop system of pilot-aircraft is studied,which is made up of the structural model of human pilot and the equivalent longitudinal model of aircraft. Based on evaluation function of the pilot work load proposed by Hess,the pilot opinion rating of the handling qualities is calculated for two...
Performance Analysis on Hot-Air Anti-Icer of Airplane Engine Inlet
Chang Shinan, Han Fenghua
1999, 25(2): 201-203.
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Two patterns of air plane engine inlet hot-air anti-icer are introduced in this paper,one is circumferential anti-icer,the other is double skin corrugated chord direction anti-icer.Based on the thermal analysis of the two anti-icers,the heat transfer performance and temperature field of ice protecte...
Studies on the Product Data Management Based on Web
Chu Xingjun, Fan Yuqing
1999, 25(2): 204-207.
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A methodology which aims at developing the framework of PDM(Product Data management) based on Web is proposed,while the features and disadvantages of conventional PDM system are analysed. The unique scenario of building enterprise-level application, provided by Internet/Intranet technology including...
Analysis of Algorithms for Calculating Job Shop Scheduling Problem's Makespan
Wei Youshuang, Han Limin
1999, 25(2): 208-211.
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JSSP(Job Shop Scheduling Problem) is a well-known NP-hard problem. In this paper the JSSP is divided into two parts: one for calculating the makespan, the other for finding a scheduling which has the minimum makespan. Up to now the papers published are all focused on how to find an algorithm for fin...
Computer-Aided Analysis for the Application of the Control Charts
Xu Zhe, Duan Xiaojiang
1999, 25(2): 212-215.
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Making use of the control charts to monitor the manufacturing process, to investigate what kind of state the process is and to find out whether the process capability is appropriate or not, it realizes the preventative ideas. Designing the control charts and judging the manufacturing process states ...
Study on the Existence and Uniqueness of G-K System in Multilateral International Comparison
Bai Manying, Ren Ruoen
1999, 25(2): 216-220.
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In studying international comparison problem, the famous G-K systemic technique is always used by economic experts. However, whether this method has the unique positive solution or not is the problem economists have been debating at all times.This problem is discussed far and wide in this paper whic...
Some Weighted Inequalities on Polyharmonic Operators and Applications
Guo Dinghui
1999, 25(2): 221-224.
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This work is devoted to weighted inequalities on polyharmonic operators and their applications to the critical exponent problems of semilinear polyharmonic operator with Dirichlet boundary value conditions. Some newer weighted inequalities on polyharmonic operator are obtained. By applying these new...
Asymptotic Solutions, Bifurcations and Chaosof Slow-Varying System
Gan Chunbiao, Lu Qishao
1999, 25(2): 225-228.
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A non-linear system with slow-varying parameters is dealt with.By using perturbation theory,the asymptotic expressions of periodic solutions are obtained and compared with the numerical results. By the phase portraits, power spectrum analysis, bifurcation diagram and computation of the largest Lyapu...
New Symmetrically Loading Epicyclic Traction Drive Reducer
Yan Deyuan, Guo Jingjing
1999, 25(2): 229-231.
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A new symmetrically loading epicyclic traction drive reducer is introduced. It has advantage of high drive ratio of other epicyclic gears. It loads three epicyclic gears and two steel tapers and drives through traction oil. It has more work surfaces and higher drive ratio. Its contact stress is decr...
Study of Reliability and Maintainability and Supportability Effectiveness Model
Kang Rui, Zhang Guodong, Lü Chuan
1999, 25(2): 232-234.
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This work analyzed the definition of system effectiveness and its affected factor, presented the concept of reliability and maintainability and supportability effectiveness, established a new synthetic parameter RMS effectiveness for reliability and maintainability and supportability design and anal...
Adaptive Extended Kalman Filter Model for Integrated Land Vehicle Navigation system
Fang Jiancheng, Shen Gongxun, Wan Dejun
1999, 25(2): 235-239.
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An adaptive extended Kalman filter model and its algorithm for GPS/DR integrated navigation system in land vehicles are proposed.By using the adaptive extended Kalman filter model and algorithm,the positioning accuracy of the vehicular integrated navigation system is greatly improved. An effective m...
Research of Effect of Missile Main Parameters on the Clobber Probability
Zhou Tao, Zhou Huizhong
1999, 25(2): 240-243.
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This work studies the probability of clobber(Pc) of a cruise missile's low height terrain following flight. It deduces the computation method of the clobber probability, puts forward a set of practical formulas for computing the probability of clobber, while taking the influences of both the random ...
Numerical Simulation of Atomic Oxygen Action on Spacecraft Surface Material
Cai Guobiao, Zhu Chengmin, Sun Bing
1999, 25(2): 244-248.
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This paper introduced the influence of the LEO(Low Earth Orbit) environments to spacecraft surface material and the evaluating technology about the lifetime of the spacecraft surface material in LEO.This work numerically simulate the action of atomic oxygen on polyimide with or without coated layer ...

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