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1998 Vol. 24, No. 5

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Design of a Digital DS/BPSK Receiver
Li Sanzhong, Zhang Qishan
1998, 24(5): 499-501.
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The design of a new digital DS/BPSK receiver is introduced and its key problems and fundmental principles involved are described in the paper.The dedicated large-scale intergrated circuit, combined with digital signal processing algorithm is adopted to implement demodulation of spread spectrum signa...
Study of Automatic Vehicle Location and Dispatching System
Wu Shaochun, Xu Ningshou, Zhang Qishan
1998, 24(5): 502-505.
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Trunked mobile radio system has the capacity of dispatching through voice, but dose not have the capacity of location and navigation. GPS (Global Positioning System) has the capacity of location and navigation but dose not have communication links between users. So, it is of signification to realize...
GPS C/A Code Search and Implement in GPS Receiver
Sun Li, Zhang Qishan
1998, 24(5): 506-509.
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From GPS signal charcteristics,time/frequency two dimension sequential search principle is introduced in this paper.Three basic sequential search techniques and an improved search technique are compared with performances of false alarm probability,detection probability and searching rate.A digital s...
Study of the Alogorithm for GPS Positioning and Velocity Measurement
Chang Qing, Liu Zhongkan, Zhang Qishan
1998, 24(5): 510-513.
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The mathematical models of GPS positioning and velocity measurement are given.Then the iterative algorithm for GPS positioning and velocity measurement under normal condition is discussed based on Gauss-Newton method and the solution under the condition that there are only three visible satellites o...
Space Determination of Message Buffer for LTPB Network
Xiong Huagang Li Jingsheng, Luo Zhiqiang, Zhang Qishan
1998, 24(5): 514-517.
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In a network system,overflow or overwrite of message buffer will cause missing of messages.For a timed token network,message transmission time and the message buffering space allocation in a node are very important issues on network real time capability.This paper analyses the message buffering mech...
Optical Architecture Design of Time-Integrating Acoustic-Optical Correlator
Jiang Xiufu, Shao Dingrong
1998, 24(5): 518-521.
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The time-integrating acoustic-optical correlator was used to capture long codes. The additive time-integrating acoustic-optical correlator was used as the experimental model. The experimental model was devided into four parts: light source, splitter, beam expansion and detector array parts . Through...
Real-Time Frequency and 2-D Angle Estimation Method with Sub-Nyquist Sampling
Si Deyi Le Qiang, Shen Shituan, Li Jingwen
1998, 24(5): 522-524.
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A method is proposed to estimate real-time frequency and azimuth and elevation angles of arrival with parallel uniform linear arrays and elements output signal delay.The method uses PRO-ESPRIT algorithm in DFT beam-space.It can estimate the frequency and angles with sub-Nyquist sampling.The analog f...
Characteristics of the Inclined Narrow-Slot on a Sectoral Waveguide
Gao Wenjun, Lü Shanwei, Xiao Wei
1998, 24(5): 525-528.
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According to the continuative condition of the tangential fields on the slot aperture which is the inclined narrow-slot on the broadwall of a sectoral waveguide,the moment method is used to calculate the magnetic current coefficient and distribution.Then the scattering field,the scattering parameter...
Intelligence Control Based on Self-Correcting Fuzzy-Neural Networks for Brushless DC Motor Drive
Fan Zhengqiao, Li Chengjun
1998, 24(5): 529-532.
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It presents a self-correcting fuzzy-neural networks controller (SCFNNC) to realize the requirement of the start,regulating the speed,resisting disturbance and the brake for brushless DC motor.The SCFNNC implements good controlling rules by the method of regulating self-conrrecting gain parameters fo...
Methods of Analysis Failure of Squeeze Film Damper
Liu Fangjie
1998, 24(5): 533-537.
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The methods of analysis failures of squeeze film damper are emphasis on expounded.First, the studies of squeeze film damper of the principal aeroengine manufacture factories in the international have been introduced. It is not only to help the envelopment of squeeze film damper for China but also it...
Effect of Radar Cross Section on Aircraft Survivability
Ma Dongli, Zhang Kao
1998, 24(5): 538-541.
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Radar cross section (RCS) of an aircraft is one of the important influences on aircraft survivability. A computational method for the probability that an aircraft survives hostile air-defense system consisting of early warning radar, interceptor and surface-to-air missile has been developed in this ...
RCS Analysis of Bomb-Fins
Li Jing, Wu Zhe, Li Tian
1998, 24(5): 542-545.
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This paper analyzes the difference of corner reflection effect between bomb-fins and ordinary rectangular corner reflector , and derives the formula of RCS of the corner reflection effect of bomb-fins for engineering calculating using equivalent-section-method, and the formula is verified by means o...
Effect of Material Nonlinearity on Progerssive Damage of Laminated Composites
Xu Chengdong, Hua Yu, Li Zhengneng, He Qingzhi
1998, 24(5): 546-548.
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A nonlinear finite element program in terms of the nonlinear shear stress-shear strain relation proposed by Hahn and Tsai is used to simulate the progressive damage of laminated composites with a circulor hole subjected to remote tensile loading.Stress,strain and ultimate strength of laminates are a...
Calculation Research of the Radar Cross Section
Xue Xiaochun, Yang Bin
1998, 24(5): 549-551.
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The paper focus on tests on electromagnetics field and Radar Cross Section (RCS) with densified grid provided by the flux-splitting method.It separated the representative value into positive and negative part in order to hold down the allowance errows respectively.For the purpose of optimization des...
Compression of Composite Honeycomb Core Sandwich Panels after Low Velocity Impact
Cheng Xiaoquan, Kou Changhe, Li Zhengneng
1998, 24(5): 551-554.
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Compressive tests after low velocity impact were carried out on Nomex honeycomb core sandwich specimens. Some methods were used to study the cause of damage development when the specimens were compressed to fail: X ray, deply, and visual inspection. Compressive failure mechanism was analyzed. The re...
Prediction of the Compressive Strength for Composite Honeycomb Core Sandwich Panels after Low Speed Impact
Kou Changhe, Cheng Xiaoquan, Li Zhengneng
1998, 24(5): 555-558.
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Based on the experimental study of compressive failure mechanisms on composite honeycomb core sandwich panels after low speed impact before, a equivalent delamination was used to replace the low speed impact damage of Nomex honeycomb core sandwich panels in this paper. It was postulated that the edg...
Structural Optimization Based on Envelope Function and Two-Level Approximation Concepts
Chen Shaojun, Xia Renwei
1998, 24(5): 559-562.
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An efficient solution method for structural optimization is proposed by coordinated use of mathematical transformation, two-level approximation concepts and dual theory. At first the original multi-constraint structural optimization problem is converted into a single-constraint optimization problem ...
Applications of Inverse Flight Dynamics
Zhang Shuguang, Fang Zhenping, Wang Yong
1998, 24(5): 563-566.
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Two computational techniques for inverse fight dynamics, namely derivation-iteration and integration-iteration techniques, are investigated.The application of inverse dynamics to determine control power requirements for post-stall maneuvering is researched, and a maneuvering flight trajectory based ...
Implementation of Data Management Method Oriented Engineering Design
Cai Yunhong, Fan Yuqing, Wang Deng
1998, 24(5): 567-570.
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This paper aims at providing a product data management method oriented engineering design by describing its implementation in the Pressure Vessel CAD system(PVCAD). By this method,a CAD system can efficiently manage and automaticly visit those product data in normal engineering design.It comprehensi...
Study on Tool Wear Monitoring Based on Milling Force
Li Jinsong, Chen Dingchang
1998, 24(5): 571-574.
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Based on the milling experiment,the characteristics included in milling force and concerning the conditions of tool wear was analyzed,the influence on cutting force spectra for cutting regime was analyzed,and the comparison among the effect to conditions of tool wear for components of cutting force ...
Comparing Two Regression Methods Based on Different Principal Components
Wang Huiwen, Yang Xianglong
1998, 24(5): 575-578.
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This paper deals with the comparing two regression methods based on different principal components.The principal components acquired by principal component analysis are the best summery of the information in the independent variables' system,but generally they are short of the explanatory capability...
Scheduling Model and Resource Pricing in Multi-Stage Manufacturing Systems
Huang Haijun, Xu Gang
1998, 24(5): 579-583.
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This paper presents a scheduling model of multi-stage manufacturing systems with multiple job classes and variable production capacity constraints at workstations. The model aims to minimize the total cost which is the sum of all costs incurred in holding, processing and schedule delay over the whol...
Traveling Waves of the Cahn-Hilliard Equation
Liu Shenquan, Lu Qishao, Wang Qi
1998, 24(5): 584-587.
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The asymptotic perturbation method is used to deal with the Cahn-Hilliard equation and obtain the inner and outer solutions of traveling waves. The two solutions are matched into one solution of the equation. The feature of the method not only matches the inner and outer solutions of the higher orde...
Algorithm of Movie Transit Intersection Survey Via the Least Square Estimation
Yan Shoufeng, Lü Fenghai, Liu Zhongkan
1998, 24(5): 588-591.
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A method based on the least square estimation for movie transit rendezvous survey is proposed. In conventional direct algorithm. It is not easy to control the switching time of two equation. This new method is an iterative algorithm, it can obtain the moving object' spatial location at anytime used ...
Modal Bifurcations and Stability Analysis of a Nonconservative Nonlinear Coupled System
Gan Chunbiao, Lu Qishao, Huang Kelei
1998, 24(5): 592-595.
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This paper deals with a coupled nonlinear Van der Pol oscillator system with linear coupled elastic term,the dissimilar modes and their bifurcations have been discussed by modal analysis.Moreover,the stabilities and the superposition of the dissimilar modes have also been analyzed theoretically and ...
Ion Beam Modification of Ti-Alloys
Hu Zhengqiong, Zhang Ying, Wang Yihua
1998, 24(5): 596-598.
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Titanium alloys are very useful in area of aeronautics and astronautics.They have good performance of light weight,high intensity and corrosion resistance,but have poor wear resistance.In order to improve their abrasion resistance,the specimens of TC4,TA7 titanium alloys were titanium-plated by sput...
Motion of Microwave Plasma Electrons in the Action of Magnetic Field
Song Ruan, Cheng Xianan, Qi Xianglin
1998, 24(5): 599-602.
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In rectangular microwave resonator, under the action of high frequency electro-magnetic field and inhomogeneous static magnetic field, the electron cyclotron resonance motion of the plasma electrons have been studied. Writing out the Newton equations of motion of the electrons and by using the numer...
Closed-Form Displacement Analysis of a Planar Fifth-Class Group with Lower Pairs
Han Lin, Liao Qizheng, Liang Chonggao
1998, 24(5): 603-606.
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The closed-form displacement analysis of one kind of planar fifth-class groups with 8 links and 12 lower pairs is solved by the method of combining vector with complex number. First, the vector equations are established according to different loops. Then the equations are changed into the form of co...
Research on Dynamic Optimization Control of Redundant Manipulators
Chen Weihai, Zhang Qixian, Yang Zongxu, Li Jian
1998, 24(5): 607-610.
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Stability and end state self-motion are important and difficult points. To solve these difficulties that exist in dynamic optimization of redundant manipulators, this paper deeply researched the inner relation and contradictory conflict between the dynamic optimization and the joint velocities, a ne...
ANN Based Expert System and Its Application to Fault Diagnosis
Luo Dehan, Chen Weihai
1998, 24(5): 611-614.
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Fault diagnosis of complex devices has become an issue of very importance in modern industrial process automation. Many methods about fault diagnosis were presented in last 30 years, and intelligent diagnostic methods have been rapidly developed in recent years. Their applications, however, are limi...
Direct Digital Synthesizer (DDS) and Performance Analysis
Gao Zexi, Gao Cheng
1998, 24(5): 615-618.
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This paper introduces the composition, operational principle and performance of DDS, and uses signal theory and method to analyze the effect of phase noise, spurious noise and digital phase truncation error on output wave form and the effect of DAC non-linearity on spectrum purity in detail. Analysi...
Close-Loop FOG Self-Diagnosing and Application in RSDIMU
Yang Yuanhong, Ma Jing
1998, 24(5): 619-622.
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The loop characteristic of close-loop interferometer fiber optic gyroscope(I-FOG) was studied first and its self-diagnosing capability has been reveal. A new type FOG with self-diagnosability has been gotten and used in a redundant strapdown inertial measure unit (RSDIMU), and a new fail tolerance a...
Model of Rain-Flow Real-Time Counting Method
Yan Chuliang, Zhuo Ningsheng, Gao Zhentong
1998, 24(5): 623-624.
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This paper presents a new model of rain-flow real-time counting method.It has the advanges such as counting easily,not needing the whole loading-time course.And it is also not necessary to readjust or modify the loading-time course.The field loading-time course of the model can be counted directly.T...

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