Table of Content

31 October 2005, Volume 26 Issue 5

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Paper

Dynamic Simulation of Tracked Vehicle Across Obstacle

WANG Ke-yun, ZHANG Xiang-hong, SHI Li-chen, HU Wei-wu，GAO Hai-yun

2005, 26(5):  577-583.  doi:10.3969/j.issn.1000-1093.2005.05.001

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The dynamic response of the suspension system for high-speed tracked vehicle across obstacle was studied in this paper. Applying the theory of multibody dynamics to the suspension system, the dynamic model of the system was established and the planar motion equations were set up. The track loop contribution to the e- quations was carefully considered. Physically, it can be equivalent to the forces composed of inertial force and tension of the track loop acting on the chassis and roadwheels. Simulation program was developed using the tool of Matlab/SimuLink. It is proved that the simulation model and analysis method are acceptable from the comparison of the simulation results with on-site test results, which can be used for the suspension system design and dynamic analysis of the armored vehicle.

Piston Movement Trajectory Under Conditions of Supercharge and Cylinder Diameter Enlargement

YU Zhi-zhuang, SONG Zheng-hua, DONG Guang-neng, XIE You-bai

2005, 26(5):  584-587.  doi:10.3969/j.issn.1000-1093.2005.05.002

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Combustion gas pressures were tested experimentally both before and after supercharge. The designed dimensions of piston were introduced both before and after cylinder diameter enlargement. To find out piston’s movement trajectory and transversal velocity, an analysis model was established based on hydrodynamic lubrication theory and piston dynamics. Newton-Raphson method was chosen to solve the dynamical equation. Finite difference method and successive over-relaxation method were used to solve average Reynolds equation. The results show that the swing range of the piston movement trajectory is enlarged after supercharge and cylinder diameter enlargement, and the transversal velocity is raised. Those factors lead to the increase of the possibility of scuffing cylinder liner and bringing about stronger shock to cylinder. The lubricant viscosity between surface of piston and cylinder liner must be denser to adapt to work condition after the supercharge design. The anti-scuffing function should be enhanced simultaneously in the design of supercharge and cylinder diameter enlargement.

Studies on Interior Flow Field and Performance in Mixed-flow Thruster

ZHANG Zhen, WANG Guo-yu，ZHANG Xiao-ying,ZHANG Mei-hong, LIU Shu-yan

2005, 26(5):  588-591.  doi:10.3969/j.issn.1000-1093.2005.05.003

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The performance of a mixed-flow pump stage in thruster and its interior flow field are studied by using numerical and experimental methods. Calculated region is from the inlet of pump stage to the outlet of thruster, which includes impeller, stator and spout. The region is cut apart by structure grid; governing equations are solved by NUMECA software. The parameters in flow fields are calculated by the method of time-marching scheme. The performance of flow rate-lift and flow rate-efficiency of pump stage are predicted according to the computational results, and external characteristics of pump stage are measured. Calculated results are preferably consistent with the experimental data. It shows that this calculation method has higher creditability and computational accuracy. Furthermore, the performance of pump stage is analyzed based on the computational result, and technical measures for improving pump stage are put forward.

Ammunition Ramming of Semi-automatic Loading Device of the Self-propelled Gun

ZHAO Sen, QIAN Yong

2005, 26(5):  592-594.  doi:10.3969/j.issn.1000-1093.2005.05.004

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The effect of “unchangeable force” ammunition ramming on the muzzle velocity was analyzed and quantitatively studied for the issues existing in the semi-automatic loading device of self-propelled gun. The solutions of unchangeable force ammunition ramming were presented.

Consistency Research of Interior Ballistic Performances of the Metal Storm Weapon System with Side Powder Chambers

NI Zhi-jun, ZHOU Ke-dong, HE Lei

2005, 26(5):  595-599.  doi:10.3969/j.issn.1000-1093.2005.05.005

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The universal mathematical model of the metal storm weapon system with side powder chambers was proposed to solve all the interior ballistic processes under the condition of different firing rates and different ballistic structures. So-called different ballistic structures indicate whether the front powder chambers are closed when rear round is fired. The influence regularities of the variations of firing rate and the ballistic structures upon the interior ballistics performance were analyzed. Finally, the technical measures to realize the consistency of interior ballistics performance were discussed.

One-dimension Two-phase Flow Numerical Simulation of Interior Ballistics for Hyper Firing-rate Weapon System

SHEN Yue, YUAN Ya-xiong, ZHANG Xiao-bing

2005, 26(5):  600-604.  doi:10.3969/j.issn.1000-1093.2005.05.006

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The working process of hyper firing-rate weapon system is analyzed in this paper. On base of that, the physical and numerical models of this system are given using one-dimension two-phase flow theory. Further- more，the changing process of each ballistic parameter of flow field in a barrel is researched using the model. Several conclusions helpful for farther experiment are drawn by means of numerical simulation.

Equivalent Target and Terminal Velocity of Fragments in Battle Damage Simulation

MI Shuang-shan, HE Jian-bin, ZHANG Xi-en,CHEN Jian

2005, 26(5):  605-608.  doi:10.3969/j.issn.1000-1093.2005.05.007

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The battle damage simulation method was presented, meanwhile the disadvantage of equivalent target expression was demonstrated. New equivalent target expression was derived by theoretical ana-lysis based on the principle of energy equivalence instead of strength equivalence. The limit velocity formula adapted for battle damage simulation was chosen, and the method of calculating the terminal velocity was proposed. Validation was made by means of the experimental data, which come from other persons’ paper. It is concluded that the equivalent target expression and the method of calculating terminal velocity can efficiently increase the calculating precision and can be used in the battle damage simulation.

Numerical Simulation for Stress in Fuel Under Launching over Loading

YAN Hua, ZHANG Qi, BAI Chun-hua

2005, 26(5):  609-614.  doi:10.3969/j.issn.1000-1093.2005.05.008

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The explosion mechanics programming ObjectMMIC is a Eulerian multi-material numerical method based on object-oriented. The stress and stress rate distributions of FAE fuel vs. time, when launching overloading acceleration is 1O4 g, have been simulated by executing the programming object MMIC, whose solid- liquid ingredient ratios are 3:2, 6.5:3.5 and 5:5，respectively. The analysis shows that the ratio of solid-liquid ingredients has a great influence on stress and stress rate. The stress depends only on the solid ingredient content of the fuel, while the stress rate depends on the solid and liquid ingredient contents. Studies in this domain have the potential for gaining information on optimizing FAE fuel, leading to the improvement of stability and launching safety. The comparison between experimental and simulative results shows that the numerical simulation method is feasible.

Extraction of Complex Video Objects Contour

WANG Xiao-tong, ZHAO Jing, JIN Liang-an

2005, 26(5):  615-619.  doi:10.3969/j.issn.1000-1093.2005.05.009

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It is a hot topic how to extract video ODjects from a large amount of video data in both spatial and temporal domains. In this paper, a semi-automatic algorithm to locate an object in the video is proposed. For the first frame of the video, the object edge is obtained by an enhanced interactive method; in the remaining frames of the video, a new Snake algorithm is proposed to detect the sharp-angled and concave object contour under the constraint of zero-crossing point, the experimental results of different video objects are obtained.

Evaluating Interfered Area of Smoke Screen Using Wavelet Analysis

ZHU Chen-guang, PAN Gong-pei, WU Xiao-yun,GUAN Hua

2005, 26(5):  620-624.  doi:10.3969/j.issn.1000-1093.2005.05.010

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The main problems of current methods for testing interfered area of anti-infrared smoke screen and its obscuring ratio were analyzed. To improve the testing quality, a new method based on multi-resolution and wavelet analysis was explored. The infrared image of smoke screen is divided into some images with different resolutions, which compose a level-featured data structure. The fringe curve of smoke cloud image is drawn out and the closed area of the curve can be calculated via the image iringe-testing algorithm of wavelet transform. Thu^ both the effectual interfered area and distribution of the obscuring ratio can be obtained. This new method can be used to assess integrally the performance of smoke screen. It also provides a reference for the development of smoke bomb and smoke device.

An Imaging System for Monitoring Debris in Lubrication Oil and Its Experiment Analysis

ZUO Hong-fu, TU Qun-zhang, LI Yan-jun

2005, 26(5):  625-628.  doi:10.3969/j.issn.1000-1093.2005.05.011

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A new technique of monitoring the debris in lubrication oil using computer vision was introduced. On the base of it, the debris monitoring system has been developed. The principle and some key techniques of the system were presented. The experimental result was also given. The developed system can be considered as an advanced means for status inspection and fault diagnosis of the aero-engines based on the oil analyzing.

The Algorithm of Data Association for Multi-passive-sensor Multi-target System

ZHOU Li, LIU Jian-zhong, HE You

2005, 26(5):  629-633.  doi:10.3969/j.issn.1000-1093.2005.05.012

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The row-column heuristic algorithm of 2D assignment problem was proposed by the author recently. This paper focuses on applying it to solve the relaxed 2D problem of a generalized 3D assignment problem. Furthermore, a modified algorithm was presented to reduce the large quantity of calculation in application of the former 3D assignment algorithm. Simulation result shows that the row-column heuristic algorithm for 2D assignment problem is easy to implement, and its run time is lower. The proceeding time of the modified algorithm of 3D assignment problem is largely reduced, and the accuracy of data association can be improved by 3 % — 5 % . The run time of the modified algorithm of 3D assignment algorithm can be further decreased when it is used with the row-column heuristic algorithm together, therefore the combined algorithm can meet the engineering requirements well.

Numerical Simulation of the Radar Signal Reflected for the Radio Proximity Fuze

LI Tie, QIANG Xue, WU Zhen-sen

2005, 26(5):  634-637.  doi:10.3969/j.issn.1000-1093.2005.05.013

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A method used to calculate the radar signal reflected in missile-target encounter trajectory phase was presented, wmch proceeds from the PO and PTD methods. A numerical simulation model was also established. An analysis of results in various miss distance and miss azimuth was made. The effect of miss distance and miss azimuth on fuze actuation was discussed. A comparison between the numerical simulation model and experimental results shows that the method, is good in accuracy and practice in engineering field. It can be used in design of the radio proximity fuze.

Research on Fire-control System Based on Distributed Nodes

WANG Zhong-xu, ZHANG Xue-biao, SHENG An-dong

2005, 26(5):  638-641.  doi:10.3969/j.issn.1000-1093.2005.05.014

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The conventional fire-control system architecture cannot meet the requirement of modern warfare. With the development of computer software and hardware, an application of digitized distributed node fire-control system structure becomes possible. By analyzing two common distributed fire-control system structures, a new practical distributed fire-control system structure was presented. The key technology was proposed and the realization of a principle prototype was also performed. Some experimental results were given to demonstrate the effectiveness of the proposed distributed fire-control system structure.

Laser-gyrocompass North-seeking and Error Analysis

XIAO Zheng-Iin, XU Jun-hui，QIAN Pei-xian

2005, 26(5):  642-646.  doi:10.3969/j.issn.1000-1093.2005.05.015

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A scheme of three-position-north-seeking with one RLG was presented to determine the benchmark for initial-alignment of the ground-to-ground tactic missile. The north-seeking error was analyzed and the method to reduce the error was proposed. The techniques mentioned above are useful for developing the laser gyrocompass north-seeking equipment satistymg the requests of initial-alignment for ground-to-ground tactic mis- sile’s launch.

The Design of Slide Predictive Guidance Law for Guided Air Ammunition

WANG Bao-cheng, SHAN Jia-yuan, LIU Min

2005, 26(5):  647-650.  doi:10.3969/j.issn.1000-1093.2005.05.016

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Some long distance air ammunition can be used to attack large still target. According to the mathematical description of target-missile relative motion built by the message that supplied by the SINS/GPS of air ammunition, the slide predictive guidance law for guided air ammunition was designed by aoplying optimal slide quadratic index. The all trajectory mathematical simulation under all kinds of disturbing has been implemented by applying the designed slide predictive guidance law and using the aerodynamic parameters of air ammunition. The results indicate that this guidance law has strong anti-disturbing performance.

CNC-ECM of the Mixed Rifle with a Large Spiral Angle in Cannon

FAN Zhi-jian, WANG Tian-cheng, FENG Yan-jun,SUN Li-ting

2005, 26(5):  651-655.  doi:10.3969/j.issn.1000-1093.2005.05.017

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This article focuses on the process of shaping the mixed rifle with a large spiral angle in the cannon, and proposes a cone-like cathode structure with asymmetric cuneiform working tooth. The degree of cone, length and the angle of the cuneiform working tooth were determined experimentally and those parameters were matched well. An expert system of ECM is then implemented. As a result, control of voltage and electric current can be respectively applied to the convex line of the rifle at exit and middle part of the tube. The on-line measurement and control of machining parameters can be performed simultaneously with the control of rotation and precession of the cathode as well. The manufacturing practice demonstrates that the cathode structure is appropriate and the control system is accurate.

A Structural Synthesis Method of Parallel Manipulators for Pose Adjusting

GUO Sheng, FANG Yue-fa

2005, 26(5):  656-660.  doi:10.3969/j.issn.1000-1093.2005.05.018

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Base on a structural synthesis method of the theory of reciprocal screw, the design method of parallel manipulator of 3 rotational DOFs for pose adjusting of radar and other equipment was proposed. Furthermore, the linear relationship of 3 limbs when platform singularities happened was analyzed. With the specific constraints provided by 3 limbs, a construction synthesis method that can completely avoid platform singularities is introduced. Finally, 3 novel manipulators are sketched as design examples.

Step-down-stress Accelerated Life Testing —— Methodology

ZHANG Chun-hua, CHEN Xun，WEN Xi-sen

2005, 26(5):  661-665.  doi:10.3969/j.issn.1000-1093.2005.05.019

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Accelerated life testing (ALT) is a commonly used method in high-reliability and long-life evaluation, and it is adopted widely in life-determination and life-extension of weapon equipment. Based on the existing methods, a new step-down-stress ALT method was brought forward from the assumption that the change in exerting sequence of stress can improve its efficiency greatly. The validity of the method was studied through theoretic model, Monte-Carlo simulation, and contrastive experiment. The results show that step-down-stress ALT method can improve testing efnciency remarkably when applied in wear-out life evaluation.

Step-down-stress Accelerated Life Testing——Statistical Analysis

ZHANG Chun-hua, CHEN Xun, WEN Xi-sen

2005, 26(5):  666-669.  doi:10.3969/j.issn.1000-1093.2005.05.020

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This paper focuses on the statistical analysis for step-down-stress accelerated life testing. A new 3-step analysis method was brought forward, the key procedure of this method was fully explained under Weibull distribution, and the solution of the estimation question in data conversion as well as the algorithm concerned was presented. A numerical example was given to illustrate the method in the end. 3-step analysis method doesn’t rely on accelerated model, and simplifies the complexity of the analysis procedure. It has a high statistical analysis precision and a good constringency, and it is beneficial to the engineering application of life evaluation and life extension in weapon equipment.

An Algorithm for Solving Laying-off Problem

ZHOU Pei-de

2005, 26(5):  670-674.  doi:10.3969/j.issn.1000-1093.2005.05.021

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Giving the definitions of all kinds of modules and proving some of their properties, an algorithm for solving the laying-off problem was designed in terms of these definitions and properties. The idea of the algorithm has two steps： handling the fundamental module first and then planning its layout in two different cases. The complexity and generality of the algorithm were analyzed. Three examples were given. The results show that the cutting efficiency is more satisfactory.

A New Network Troubleshooting Method Based on Multi-agent

LI Qian-mu, QI Yong, WANG Yang, ZHONG Yi, LIU Feng-yu

2005, 26(5):  675-680.  doi:10.3969/j.issn.1000-1093.2005.05.022

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To overcome the limits of present network fault diagnosis systems and the difficulty of different fault patterns, a distributed network fault diagnosis framework based on muiti-agent was proposed. In the framework, combined fuzzy neural network with rough sets theory, a new algorithm—RNFNN was presented, which greatly improves the performance of the system, with a nonlinear mapping realized by using topological structures and weights of the FNN. Also, the state-checking and authentication mechanism ensure the security of the agents and their communication. The framework is environment- independent, thus providing a general- purpose heterogeneous network fault diagnosis. The experiment result of this framework shows a good diagnostic ability.

Applying the Fuzzy Clustering Analysis of ISODATA to the Classification of Camouflage Effectiveness

Lü Xu-liang, LIN Wei, XU Wei-dong,PAN Yu-long, SUN Wen-yan

2005, 26(5):  681-684.  doi:10.3969/j.issn.1000-1093.2005.05.023

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A soft demarcation method based on the fuzzy clustering theory was proposed, which is better than the former classification methods. As an example, the fuzzy clustering of ISODATA was used to classify the optical camouflage effectiveness. The model and the algorithm of the optical camouflage effectiveness classification were established and analyzed. The effectiveness classification was achieved and the index values for each class were finally determined.

Research on Mechanical Fault Feature Selection Based on Wrapper Model

WANG Xin-feng, QIU Jing, LIU Guan-jun

2005, 26(5):  685-689.  doi:10.3969/j.issn.1000-1093.2005.05.024

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Applying lots of primal features to identify fault condition leads to reduce classification correctness. Feature selection can remove redundant features in the primal features to enhance the effect of diagnosis. Filter? method which was widely applied before isn’t satisfied with the further demand for diagnosis correctness. A feature selection method based on wrapper model was proposed. The approaches to the subject include： genetic algorithm for optimal feature subset selection; k-fold cross-validation method for error rate evaluation ana BP neural network for fault classification. As an example, the results of bearing fault diagnosis prove that the method possesses excellent optimization feature subset property, and obtains high correctness rate.

Comprehensive Reviews

Advance on Launch Safety for Gun Propellant Charge

RUI Xiao-ting, YUN Lai-feng, SHA Nan-sheng, CHEN Tao, WANG Hao, LIU Jun

2005, 26(5):  690-696.  doi:10.3969/j.issn.1000-1093.2005.05.025

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This paper focuses on the advance in study on launch safety for gun propellant charge. That the charge bed near the base of projectile extensively breaks before lighted is the basic reason causing the breach blow. Based on the clues of the compress and fracture of charge near the base of projectile, the evaluating system of launch safety for gun propellant charge is completely expounded. Launch safety test or experiment for gun propellant charge involves ： simulation test of combustion and dynamic environment in gun chamber, the compress and fracture simulating experiment for charge bed and the vivacity testing experiment of charge. This paper demonstrates that the degree of propellant fracture is the standing ground of launch safety criterion. The physics explanation of initial comparative vivacity ratio is discussed, and the program of evaluating launch safety for gun propellant is introduced.

Experimental Techniques and Analysis

A Study on the Anti-shockwave Performance of Emulsion Matrix

WANG Yin-jun, WANG Xu-guang

2005, 26(5):  697-701.  doi:10.3969/j.issn.1000-1093.2005.05.026

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It is significative for understanding the mechanism of pressure desensitization of emulsion explosive to study the anti-shockwave performance of emulsion matrix. A certain quantity of glass microballoons (GMB) is mixed with emulsion matrix after it was subjected by shockwave, and its explosive property is compared with that of emulsion explosive bearing the same quantity of GMB and subjected by shockwaves too. It shows that the anti-shockwave performance of emulsion matrix is better than that of emulsion explosives. The analysis results indicate that there are many tiny interfaces in the explosive when sensitizers mixed with emulsion matrix, and the matrix nearby interfaces is broken easily when subjected by shock waves, thus the explosive property decreases accordingly.

Short Papers

An Attack Direction Differentiating Model of Anti-ship Aerial Targets Based on the Integrated Clustering Method

LI Jin-jun, CONG Rong, LIU Chi,XIONG Ji-guang

2005, 26(5):  702-705.  doi:10.3969/j.issn.1000-1093.2005.05.027

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The hierarchy and the density-based methods are useful system clustering technology in clustering analysis. But those methods are restrictive in many cases. An integrated clustering method was proposed to meet more requests of surface fleet anti-air combat. An attack direction differentiating model was established based on the integrated clustering method. The model can reliably estimate the air attack directions to the surface fleet. It is more helpful to the development of surface fleet C3I system.

Research Notes

The Application of Consistency Multisensor Data Fusion to Fuze Information Fusion

WANG Xin, ZHANG He

2005, 26(5):  706-708.  doi:10.3969/j.issn.1000-1093.2005.05.028

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By utilizing technique thought of data fusion of consistency multisensor and the multi-source data complementarity or fault-tolerability, the reliability of multisensor information is improved. As a result, the multi- sensor fusion system can remove the mistaken actions caused by the failure of the sensor or other factors in the process of system control and release of the security device.

An Experiment Investigation of the Aerodynamic Characteristic for a Multi-wing Light Antitank Missile

LEI Juan-mian, WU Jia-sheng

2005, 26(5):  709-711.  doi:10.3969/j.issn.1000-1093.2005.05.029

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Based on the aerodynamic configuration of New Javelin light antitank missile, a series of wind tunnel experimental model was designed with the component build-up method. Six-component force experiments were conducted for Mach numbers ranging 0.3 — 0.5 and angles of attack — 1° — 15°. The experimental results show that, while the wing number increases from four to eight, the experimental configurations are static stabilization and the normal force and normal overload increase more than 40 %，but the increase of zero-lift drag is under 5 % . The experimental results also indicate that eight wing configuration maybe is the best configuration.

Preparation and Performance Measurement of Phthalocyanines Reverse Saturable Absorption

LIU Da-jun, ZHOU Fen-guo, DUAN Qian, LU Xiao-xing, WANG Li-jie

2005, 26(5):  712-715.  doi:10.3969/j.issn.1000-1093.2005.05.030

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Four new types of metal phthalocyanine compounds were prepared. By mingling the compounds with the PMMA, composite materials and Iilm coating materials of metal phthalocyanine/ PMMA were prepared. The compounds were characterized in the UV-V IS spectra and the reverse saturable absorption measurements of the composite materials were performed. It is found that the compounds have good performance of reverse saturable absorption and good linear transmittance. The measured max transmittance of the composite film coating materials of B/PMMA is more than 70%，its initial threshold is 127.1 mj/cm2 and dynamic range is 1.43. All these characters show it is an excellent reverse saturable absorption material. This research has led to be helpful in preparing new anti-laser materials applicable to multiple wavelength, high optical density and having high transmittance.

Research on a Mission-oriented Maintenance Resources Deployment Decision Support System

ZHANG Tao, GUO Bo, TAN Yue-jin

2005, 26(5):  716-720.  doi:10.3969/j.issn.1000-1093.2005.05.031

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The models and design scheme of a mission-oriented maintenance resources deployment decision support system (MOMRDDSS) were proposed. Using the formal description method, the relationship among missions, configuration, maintenance processes and maintenance resources of the equipment was given. The maintenance resources deployment models in prewar and war time and its algorithms were proposed by analytical and simulation method. The design scheme and functional framework of MOMRDDSS were given. The conclusions can be used in the design and development of MOMRDDSS.