Table of Content

30 April 2008, Volume 29 Issue 4

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Paper

Research on the Method of Improving the Acceleration Performance of Tracked Vehicle with Hydrodynamic Mechanic Automatic Transmission

WANG Juan, CHEN Hui-yan, XU Nuo

2008, 29(4):  385-389.  doi:10.3969/j.issn.1000-1093.2008.04.001

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An introduction of composition and operational principle of hydrodynamic mechanic auto?matic transmission was given.The paper placed emphasis on the methods of improving the acceleration performance of tracked venicle, which contain the choice of proper start gear, the choice of appropriate shitting timing and lock-up timing, and the right control strategy of oil-charging and releasing parame?ters of clutches in shift process. Proving ground test shows that, compared with the accelerating pro?cess without using the above methods, the acceleration performance of vehicle is significantly im?proved .

The Generalized Modular Rapid Design of Automatic Weapon and Its Development

WANG Yong-juan, ZHAO Jun, ZHONG Yuan-long

2008, 29(4):  390-395.  doi:10.3969/j.issn.1000-1093.2008.04.002

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A generalized modular design of automatic weapon was put forward to improve the quality and efficiency of design, reduce the development cycles of products, ana promote the generalization, modularization and serialization of products. According to the features of automatic weapon, the divi-sion method of product modules, interfaces ana code scheme have been studied and proposed using the theory of generalized modular design. The general structure of software was put forward by analyzing the implementation procedures. A template database, an example database, and a parametric map database were built. A special rapid design module used in Pro/E environment was developed using Microsoft VC + + 6.0, Oracle and Pro/TOOLKIT. An example was used to verify its feasibility, and the quality and efficiency are raised obviously.

Researcli on the Factors Affecting Launching Performance of Two-stage Charge for the Secondary Propulsion in Bore

LIU Guo-xin, LIAO Zhen-qiang, ZHANG Fan,Chen Yang

2008, 29(4):  396-400.  doi:10.3969/j.issn.1000-1093.2008.04.003

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A new scheme of two-stage charge for the secondary propulsion in bore was proposed to in-crease the muzzle velocity of the projectile of large caliber automatic weapons. An interior ballistic model of the scheme was established. The effects of loading factors, such as mass matchings of projec?tiles and charges, delay time and pre-tightening force, on bore pressure and muzzle velocity were shown.

Automatic Sea Target Detection Based on Wavelet Transform

PEI Li-li, LUO Hai-bo, GENG Yan-feng,ZHAO Yao-hong, HAN Guo-rui

2008, 29(4):  401-404.  doi:10.3969/j.issn.1000-1093.2008.04.004

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An effective target detection algorithm based on wavelet transform was proposed by nice lo?calization ability and directional characteristic of wavelet multi-resolution analysis. The target detection was conducted by the algorithm in vertical component of wavelet decomposition. After the mutual en?ergy combination and the sea clutter suppression, the target position was detected by the maximum en?ergy judgement, the target size was calibrated by the double window similarity measurement function. The experimental result shows that the target can be detected by the algorithm in single frame image, the better detected effect can be obtained under the complicated background of sea and sky with the disturbance of cloud and fish scale light.

Jamming Technique of Interrupted-sampling and Periodic Repeater Based on Digital Radio Frequency Memory

LIU Zhong, WANG Xue-song, LIU Jian-cheng,WANG Guo-yu, XIAO Shun-ping

2008, 29(4):  405-410.  doi:10.3969/j.issn.1000-1093.2008.04.005

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A jamming technique on for linear frequency modulated pulse; pulse compression radar was studied. An operational principle of jamming of interrupted-sampling and direct repeater based on digi?tal radio frequency memory was introduced, and its jamming effectiveness was analyzed. On the basis of the above mentioned jamming, a new jamming technology of interrupted-sampling and periodic re?peater was presented. The new jamming effectiveness was theoretically analyzed, and the effect ot key parameters on the jamming effectiveness was discussed emphatically. The new jamming can make the linear frequency modulated pulse radar obtain numerous lifelike false targets, of which number, ampli?tudes and positions can be adjusted or controlled by changing some parameters of the new jammer. The studied result shows that the new jamming has better effectiveness than that of the above mentioned jamming.

Measurement Model for Attitude of Gyro at Small Angle Random Toand-fro Vibration

SONG Hai-feng, DENG Hao, ZHNG Rong,YOU An-qing, WANG Lei, ZHAO Ping,YE Chang-chun，YU Li-xia

2008, 29(4):  411-414.  doi:10.3969/j.issn.1000-1093.2008.04.006

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Measurement of gyro attitude at small angle random to-and fro vibration was studied by the gyrounit type JG-8. A modified recursion linear regression algorithm was presented to the measure?ment error and gyro-drift of real-time amended gyro. The integral values of original angular velocity of the gyro regressed sectionally, the angular velocity was modified by the straight line slope in real time, the angle values of three axes of the vibration test bed were obtained by integrating the modified angu?lar velocity. The measured result was validated by comparing the measured data with the line-ruler da?ta, the lead data containing the attitude with the data from the coder in the observation equipment af?ter closing loop. The validated result shows that the algorithm can effectively eliminate the unsteady DC noise in the signal, and make the attitude measuring precision achive within 0.3°.

Simulation on Lift Generation of Ship Antirolling Fin at Zero Speed

WANG Yu, JIN Hong-zhang, QI Zhi-gang,LI Dong-song

2008, 29(4):  415-419.  doi:10.3969/j.issn.1000-1093.2008.04.007

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The antirolling with ship antirolling fin at zero speed is different from that of the conven-tional antirolling theory of ship. In order to study the process of lift generation of antirolling fin at zero speed, a lift generation model of antirolling fin was built at zero forward speed based on the theory of Weis-Fogh mechanism, and the lift generation model of NJ5 antirolling fin developed by Harbin Engi?neering University was studied by simulation. For NJ5 antirolling fin, a numerical calculation was made using the CFD software. The result shows that the numerical calculalion result is accordant with the simulation one. The method lays the foundation of conducting hydrodynamic test and researching controlling rule further.

An Acoustic Emission-Based Uniaxial Tensile Test Method for Evaluation of Fracture Toughness of a Coating on Its Substrate

YANG Ban-quan, ZHANG Kun, CHEN Guang-nan,LUO Geng-xing, XIAO Jing-hua

2008, 29(4):  420-424.  doi:10.3969/j.issn.1000-1093.2008.04.008

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Fracture toughness and interfacial adhesive strength of coating on its substrate are the crucial parameters characterizing the performance and reliability of coating-substrate system. In this paper, a tensile experiment with acoustic emission signals inverse analysis and m situ observation of the cracking of the coating and interface was proposed to evaluate the fracture toughness and interfacial shear strength of the hard and brittle electroplated chromium coating on ductile steel substrate. The acoustic emission detector was attached to the specimen to check the signals of the cracking of chromium coat?ing or interface and whether the crack density became saturated or not. The experimental results show that the strong signals belonged to the periodic cracking of the chromium coating. A mechanical model can be used to determine the fracture toughness. When the crack density of chromium coating became saturated, the steel substrate exhibited plastic deformation; however, the interface cracking could not be observed. This indicates the yield shear flow stress of the substrate can be exerted along the inter?face through the ductile substrate undergoing plastic deformation, and the yield shear flow stress level of the ductile steel substrate can only serve as a lower bound estimate of the ultimate shear strength of the interface.

Research on the Control Parameters of Creep-thermal Fatigue Crack

YAN Ming, SUN Zhi-Ii, YANG Qiang,CHEN Feng-xi, LIU Qin

2008, 29(4):  425-429.  doi:10.3969/j.issn.1000-1093.2008.04.009

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The opening process of creep-thermal fatigue crack was studied by using finite element method in consideration of the bilinear kinematic hardening and creep characteristic of a material. The crack is closed under the compressive stress during heating and insulating. Since the inelastic strain generated in the two processes can not recover by itself, the tensile stress appears in the anaphase of cooling-down process, which is normal to the crack surfaces and makes the crack gradually open. At this time, the temperature of material around the crack is lower than the creep temperature, and the crack opening is in the unloading process of the thermal stress; therefore the C parameter and /-inte?gral are not applicable to the creep-thermal fatigue crack. The stress intensity factor can be used as a control parameter under a small scale yielding condition. It can be shown from calculate that the stress intensity factor increases with the prolonged insulating time, raised maximum temperature and crack growth.

The Sampling Inspection Method Based on Optimization Analysis

MAo Zhao yong, SONG Bao wei, HU Hai-bao,WANG Peng

2008, 29(4):  430-433.  doi:10.3969/j.issn.1000-1093.2008.04.010

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In order to reflect conditionality between producer venture and consumer venture, an opti?mization method of sampling inspection was established, in which venture is taken as an optimization objection. Compared with conventional sampling inspection method, the method can avoid computing complex non-linearity equation. The main contribution of this paper is to adopt a multi-objective opti?mization theory and Pareto optimal set in sampling inspection research for improving quality. A special sampling inspection case was presented through computer simulation. It was demonstrated by the com?putation analysis of a practical example that the method is correct and feasible.

Development and Test of Scientific CCD Camera for Large Sky Area Multi-object Fiber Spectroscopic Telescope

ZOU Si-cheng, WANG Gang

2008, 29(4):  434-439.  doi:10.3969/j.issn.1000-1093.2008.04.011

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A scientific CCD camera for the low-dispersion spectrograph of large sky area multi-object fiber spectroscopic telescope (LAMOST) was introduced along with the test and analysis of its perfor-mance. The CCD camera consists of large area array CCD cmp, camera head, LN2 cooling system, controller and software. The CCD controller can realise low readout noise, software-selectable switch?ing from single-to four-output amplifier readout modes, pixel Dinning mode and trap test, and satisfy the principal goal of LAMOST project. Testing method and results of the camera such as system gain, readout noise, dark current, full well and so on were described m detail.

Software Reliability Integrated Evaluation Model Based on Bayesian Estimation

MA Sa-sa, NING Ru-yun

2008, 29(4):  440-445.  doi:10.3969/j.issn.1000-1093.2008.04.012

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Quantitative evaluation and prediction of software reliability are the important parts of soft?ware reliability engineering. Support vector machine regression was applied to build up a software reli?ability prediction model based on the metrics of software quality, and the creditability theory based on Bayesian estimation was introduced into the field. By this means, the prediction result of software reli?ability model based on the metrics of software quality and the evaluation result of software reliability growth model based on iailure data were combined rationally via the credibility factor so that the exten?sive information about software reliability was utilized to obtain a more reasonable evaluation result of software reliability. According to variance disassemble and optimal linear non-homogeneous credibility estimator, the mathematic expression of this software reliability integrated evaluation model based on Bayesian estimation was described in detail, and the obtaining method of credibility factor was illus?trated by the practical example. The simulation experiment indicates that the moael possesses reason-ableness and feasibility.

The Method of Radiographic Image Restoration Based on Improved Equivalent Power Spectrum Filter

WANG Li-ming, YAN Zhuang-zhi, HAN Yan

2008, 29(4):  446-449.  doi:10.3969/j.issn.1000-1093.2008.04.013

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Scattering is a main factor wmch influences the sensitivity of radiographic system ? By study?ing the mechanism of image degradation, analyzing the advantages and disadvantages of equivalent power spectrum filter, and estimating the power spectrum of the typical images, the authors put for?ward an improved restoration method based on equivalent power spectrum filter. The practical results show that this method can depress the blur of image, effectively preserve the edge information of radio?graph, and have a certain commonalify.

The Measurement of Inertia Moment and Centroidal Deviation of Rocket Projectile with Compound Pendulum Method and Its Error Analysis

ZHANG Xin-ming, WANG Ling-yun, LIU Jian-he,YANG Jian-dong

2008, 29(4):  450-453.  doi:10.3969/j.issn.1000-1093.2008.04.014

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Based on the principle of compound pendulum, the measurement method and corresponding equipment for the centroidal deviation and the rotary inertia of rocket projectile were described. The. calculation formulae of the centroidal deviation and the rotary inertia were deduced, and the factors in?fluencing measurement accuracy were analyzed. The calculation formulae of uncertainty of measure?ment results were presented, and on the assumption that the errors of all measured parameters are of normal distribution, the calculation formula of limit error of measured results was deduced. The practi?cal example calculation and experimental test were conducted. The result shows that the method is fea?sible and efficient, and the measurement accuracy can meet the practical requirement of engineering. This method uses the knife edge as the support, and the corresponding equipment is simple and easy to operate, which is especially suitable to the medium and small-sized shell body.

Adaptive Iterative Learning Identification for a Class of High Order Linear Time-varying Systems

GUO Yu, SHEN Xiao-ning, CHEN Qing-wei,HU Wei-li

2008, 29(4):  454-458.  doi:10.3969/j.issn.1000-1093.2008.04.015

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A model reference adaptive iterative learning identification algorithm was proposed for a class of high order linear time-varying systems which are uniformly strongly stable, uniformly strongly con?trollable and repeatable in finite time interval. An iterative learning law for the time-varying parame?ters was deduced based on Lyapunov-like function. The algorithm can identny the unknown rapidly time-varying parameters, guarantee that the model tracking error can converge to zero uniformly with respect to the finite time interval when the number oi iteration tends to infinite and the estimated*pa?rameter error is bounded and convergent. The condition, by which the estimated parameters converge to their actual values, was analyzed. The effectiveness of the algorithm was demonstrated by simula?tion.

A Cartridge Identification System Based on Image Retrieval

ZHANG Shu-jiang, YAN Jing-long, XING Hui

2008, 29(4):  459-463.  doi:10.3969/j.issn.1000-1093.2008.04.016

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Taking aim at current domestic situation of the cartridge recognition technology and the criminal staff members' needs, an automatic cartridge identification system was designed. The system can capture cartridge trace images automatically, standardize the images by pre-processing, and store the standardized images in database. The images, which are most similar with the goal image, in the database were retrieved by using the retrieving method based on multiwavelet histogram. According to the retrieved image, the cartridge examiners could make further decision. The identification velocity and precision are greatly improved by the systematic functions of capturing, standardizing, storing and retrieving, which replace the overelaborate and time-consuming artificial way of contrasting one by one under microscope and checking.

Model Analysis on Four-level Nested Software Anti-aging Policy of Distributed System

WANG Zhan, GUO Cheng-hao, LIU Feng-yu,ZHANG Hong

2008, 29(4):  464-468.  doi:10.3969/j.issn.1000-1093.2008.04.017

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In order to save the cost of software rejuvenation, improve the reliability of software and ad-vance the applicability of anti-aging, the fine-grained software anti-aging was executed in distributed system. The establishment of rational rejuvenation levels, searching of direct coupling modules and e- duction of restart chains on different levels are the keys of fine-grained software rejuvenation policy. Based on coupling relation of controlling, calling and data inquiring between the modules on different levels of distributed system. The system restartable level standard was set down, a method to search the direct coupling modules and restartable set of modules was put forward, the restartable priority lev?el was defined, the constructional rule of the restartable chains on different levels was obtained, and then a policy of the retartable implement was established; and the four-level nested anti-aging retartable model was established by comprehended stochastic Petri net and determinative finite automaton. To support the anti-aging of software with fine rejuvenation granularity in distributed system.

The Application of Judgment Matrix Approach in Detection of Vicious Script in HTML

ZHANG Hao, TAO Ran, LI Zhi-yong,DUHua

2008, 29(4):  469-473.  doi:10.3969/j.issn.1000-1093.2008.04.018

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A vicious script in HTML was analyzed, and a vicious script detection method based on the statistics was proposed. The different weignts for different statistic methods were set by a judgement matrix method which is one of the subjective weighting method, the statistic results of the script were perfected by a weighted geometric mean method, the detected results of the script were obtained. The experiment result shows that the method can efficiently detect the vicious script encrypted by encode and unescape.

Experimental Techniques and Analysis

Research on Modal Measurement Method of Complicated Structure

DONG Xiao-rui, YANG Shi-wen

2008, 29(4):  474-477.  doi:10.3969/j.issn.1000-1093.2008.04.019

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The calculated results of finite-element modal were used to make the optimum research on measuring and exciting points by taking the modal measurement method of V12-cylinder diesel engine body for example. The degree of freedom number and the matching condition of finite-element modal vibrating type were verified by comparing the vibrating types of finite-element modal with that of mea?surement .The results indicate that the modal measurement scheme of the complex structure can be es?tablished using the pre-analytical results of finite-element.

Research Notes

Parallel Operation Control Method of Uninterrupted Power System in Gun Command System

HU Wen-bin，YIN Xiao feng, HA Jin-bing, DONG Jian-nian

2008, 29(4):  478-482.  doi:10.3969/j.issn.1000-1093.2008.04.020

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A parallel operation control method based on a modulated phase tracKing method was de?signed for high reliability requirement of uninterrupted power supply used in gun command system. The method makes the output power value of every parallel module transform into the phase value of periodic pulse signal on the control communication line with phase modulation, then makes all modules track the lead module in modulation pulse phase, 1.e. the maximum output power module, to realize power-sharing. The current-sharing control precision was improved by the digital pulse phase-locking, the safety and the antijamming ability were improved by the digital signal compression, in which a cur-rent-sharing control was implemented through only one communication line. The experimental results show that the system has high current-sharing precision and good stability. It can switch the fault module automatically, realize the democratic master-slave logic with high control redundancy, and im?prove power supply reliability efficiently.

Research on the Guidance Law of Underwater Autoguide Weapon

LIU Yu, YUAN Jian-ping, HOU Chao-huan

2008, 29(4):  483-486.  doi:10.3969/j.issn.1000-1093.2008.04.021

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Traditional guidance law of underwater autoguide weapon had lots of defects, which was un?suitable for the tactical requirement of modern torpedoes. In this paper, a guidance law based on the sliding mode control theory was proposed for underwater autoguide weapon. In this guidance law, the increment of yaw angle was used rather than the angle velocity, which proved to be more suitable for the underwater environment. Simulation results show that the sliding mode guidance law gives an out?standing performance for the underwater target.

Potential Equilibrium Analysis of Interior Ballistic Processes in Electro- thermal Chemical Gun

LIN Qing-hua, LI Bao-ming

2008, 29(4):  487-490.  doi:10.3969/j.issn.1000-1093.2008.04.022

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In the hypothesis of the energy of propellant being equaled by electrical energy, the theory of potential equilibrium in interior ballistics can be used to analyze the interior ballistic processes of electro-thermal chemical gun. Based on the results of conventional and electro-thermal chemical shoot experiments, a data processing method using the potential equilibrium theory was discussed. Tnis method can be used to calculate the drag coefficient of bullet, effective powder force and effective coef-ficient of electrical energy. Based on the change of parameter in the potential equilibrium point, the abnormal phenomena of combustion can be detected.

Research on the Deformed Microstructures in Al-5. 9 Cu Metal Targets Under High Velocity Impact

DU Yuan-yuan, SU Xue-kuan, JIN Tou-nan, NIE Zuo-ren

2008, 29(4):  491-494.  doi:10.3969/j.issn.1000-1093.2008.04.023

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The Al-5.9Cu metal target was impacted by armor-piercing incendiary at different impact velocities. At velocity of 495 m/s, some parts of grain boundaries showed serrated heaves near the crater bottom, and two kinds of deformed bands were formed. The one looked like slip bands, the oth?er was paralleled to the direction of flow pattern. There were shear bands and tearing damages near the crater wall. Whirlpool-like shear bands and helical-like shear bands in the region around crater were produced by high velocity impact. Plenty of microbands near the craters were observed at the two dif?ferent velocities. A possible microband formation mechanism is proposed by extending the HNANG model. The model involves the spread of impact waves, the generation of polarized dislocation, the an?nihilation of dislocation in the middle oi the bands, the formation of secondary dislocation and so on.

The Effect of Carrier films on Contact Pressure Distribution and Macro surface Profile of Silicon Wafer in Chemical-mechanical Polishing

LU Yu-shan, ZHANG Liao-yuan, WANG Jun, FENG Lian-dong

2008, 29(4):  495-499.  doi:10.3969/j.issn.1000-1093.2008.04.024

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In order to obtain the effect of carrier film on contact pressure distribution in the chemical- mechanical polishing(CMP) of silicon wafer, a mechanism model and a boundary equation were set up, then the contact pressure distribution was calculated and analyzed by use of finite element method, and the calculated result was verified by polishing experiments. At last the pressure distribution of con?tact surface between silicon wafer and polishing pad and the rule of that the physical parameters of car?rier film had an effect on pressure distribution were obtained, ana the most important relation between the non-uniformity of contact pressure distribution and the flatness error of silicon wafer in CMP was ensured. The result shows that the contact pressure distribution is non-uniform and the pressure in the outside borderline of silicon wafer is maximal, which leads to the flatness errors and collapse of silicon wafer. When Young’s modulus and Poisson’s ratio of carrier films are increased, the uniformity of contact pressure distribution can be improved, and the flatness topography in the available region of wafer surface become much better.

Research on the Synthetic Technology of I, I'Diacetylferrocene

ZHANG Jun-xiang, GAO Song-ping, WANG Zhi-yu

2008, 29(4):  500-503.  doi:10.3969/j.issn.1000-1093.2008.04.025

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Biacylation of ferrocene was carried out in 1, 2-dichioromethane using acetic anhydride as acetylizing agent and anhydrous aluminium chloride as catalyst. The effects of tne reaction tempera?ture, quantity of catalyst, molal ratio of reactants, charging of reactants and reaction time on the syn?thetic technology were investigated. The synthetic technology of 1, 1'diacetylferrocene was obtained, whicn nas mgher productivity and shorter reaction time.

Properties of Texture-etched ZnO ： Al Substrates

XUE Jun-ming, HUANG Yu, XIONG Qiang,MA Tie-hua, SUNJian, ZHAO Ying, GENG Xin-hua1

2008, 29(4):  504-508.  doi:10.3969/j.issn.1000-1093.2008.04.026

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Using a 2% Al-doped Zn target, ZnO： Al(ZAO) thin films were deposited on a glass sub-strate by mid-frequency pulsed magnetron sputtering. The texture-etched ZAO substrates were pre?pared by etching the smooth films in diluted HCl. The dependence of surface textures on power, pres?sure, etching time and diluted HCl chroma were investigated, and the resistivity of ZAO films before and after etching in diluted HCl were analyzed. The results indicate that the good surface textures of ZAO thin films could be prepared under the conditions of low power, low pressure, etching time of 20 s and diluted HCl chroma of 0.5%, such ZAO thin film has the potential application in silicon thin film solar cells.

Design and Development of Helicopter Rotor Health Monitoring System Test-bed

ZHU Xu-cheng, HOU Zhi-qiang, WU Guo-hong

2008, 29(4):  509-512.  doi:10.3969/j.issn.1000-1093.2008.04.027

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The concept design and development of rotor health monitoring system (HMS) test-bed was presented in the paper. Some details about its rotor data system, fuselage data system and HMS com?puter system were introduced. Digital strain sensors, remote multiplexing unit and wireless slip ring were integrated into the system to overcome the number restriction of sensors and the wear problem of contact slip ring. A short time model error-based damage detection method was put forward. The hy?brid model-based diagnosis and prognosis framework was adopted in the application software. The de-velopment of rotor test-bed is of applicable significance on researching the fault analysis and diagnosis methods of rotors.