Table of Content

30 June 2007, Volume 28 Issue 6

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Paper

Study of Armor Power Cabin Intelligent Layout

WANG Cai-hong, CHA Jian-zhong, LU Yi-ping,ZHAO Hai-tao

2007, 28(6):  641-645.  doi:10.3969/j.issn.1000-1093.2007.06.001

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An intelligent layout based on distributed knowledge was presented for solving the layout proDlem of armor power cabin. Layout cases, rule knowledge and constraint knowledge were expressed with a compound knowledge model. The system structure and flow of power cabin intelligent layout design system based on compound knowledge were described. The experimental result of the prototype shows that this method can provide an effective resolution for the practically complex layout problems in engineering.

Study on Improvement Fire Density of Trawler Carried Rocket Launcher

YU Cun-gui, LE Gui-gao, MA Da-wei

2007, 28(6):  646-650.  doi:10.3969/j.issn.1000-1093.2007.06.002

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In order to improve fire density level of trawler carried rocket launcher system, a technical scheme of two guide tube simultaneous firing was proposed for shortening fire time and reducing initial disturbance of rocket projectile. The mutual effect of two salvo rocket projectiles in propulsion period was analyzed through firing delay dispersion ana influence of rocket exhaust gas. The initial distur?bances of rocket projectiles in old fire sequence and new fire sequence were analyzed according to the dynamic simulation results. The research results prove that the method is useful to improve the fire density of trawler carried rocket launcher, which is of value to practical operation of the systems.

Effect of Motorial Modes of Gliding Extended Range Projectile on Range Extended Efficiency

SHI Jin-guang, WANG Zhong-yuan, CAO Xiao-bing, ZHANG Bing-Iing

2007, 28(6):  651-655.  doi:10.3969/j.issn.1000-1093.2007.06.003

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Increasing a range of projectile with gliding flight is a quite efficient technique. The flight process of gliding extended range projectile was explained. A ballistic model of gliding control segment was established. The pitching gliding flight and rotating gliding flight of the body were used in the gliding control segment. The influence of two kinds of motorial modes of the body on the extended range efficiency of projectiles was analyzed. The result shows that the extended range efficiency of the pitcnmg gliding flight is higher, but the control system is complicated and the rudder requirement is higher in the course of the rolling control; the extended range efficiency of the rotating gliding flight is lower, but the control system is simple and the ruader requirement is lower in the course of the whole control.

Study on Multi-resolution Imaging by Airborne Phased Array Radar

HU Xue-cheng, ZHANG Hua, JIANG Wei,LIU Zhong

2007, 28(6):  656-660.  doi:10.3969/j.issn.1000-1093.2007.06.004

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The signal waveforms of airborne synthetic aperture radar (SAR) experimental system with several different resolutions were designed based on the analysis of aperture dispersive effects of phased array antennas, and the corresponding SAR imaging techniques were discussed. In the Doppler beam sharpening (DBS) mode, the migration through range resolution correction (MTRL) and quadratic phase compensation technique were used to improve DBS resolution. In the squint SAR mode, the SAR imaging scheme, including the time domain MTRし，frequency domain range curvature correction and the third phase compensation technique, was used to extend squint SAR azimuth focus depth based on the characters of bigger MTRC and smaller range curvature. The initial flying experimental data were used for system analysis,, and SAR images with high quality could be obtained. I he results verify the rationality of the introduced experimental system design and its imaging scheme.

Establishing Model and Plotting Zero Doppler Regions for Moving Targets Along Bistatic Baseline

GUO Qiang, LI Wei-feng, TAO Ran,WANG Yue

2007, 28(6):  661-666.  doi:10.3969/j.issn.1000-1093.2007.06.005

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According to the idea of establishing monostatic target model, the echo model for a moving target model along bistatic baseline was established by the theory of analytic geometry. The moving target model along bistatic baseline is a special situation of general bistatic target’s echo model. The es?tablishment of the model lays an analytical foundation for dividing zero Doppler areas on the bistatic baseline while a model established by Tsao T doesn’t possess a Dove- mentioned feature. Besides the fea-ture, no complex reference system is required for the model in the paper. It provides a new idea for analysing ambiguity function.

Realization of the High Transmission Reliability in Tactical Digital Information Link

WANG Zheng, WANG Shun-man, KUANG Jing-ming

2007, 28(6):  667-670.  doi:10.3969/j.issn.1000-1093.2007.06.006

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Coding technologies related to tactical digital information link (TADIL) system reliability and the important effects of the correcting code on the system signal transmission, processing and dis?tribution were analyzed. The principle, design method and correcting performance for RS coding and RS decoding of TADIL were studied. The study results show that the combination of trellis and RS codings can realize error correction for channel transmission, and improve reliability and efficiency for data transmission.

Research on Terminal Damage Model and Simulation of Multi-purpose Guided Missile Warhead Attacking on Helicopter

XU Wen-xu, SONG Zhen-duo, ZHANG Geng-yu,QI Zhan-yuan

2007, 28(6):  671-676.  doi:10.3969/j.issn.1000-1093.2007.06.007

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A terminal damage simulation model in target coordinates of multi-purpose missile warhead, including kinematics model, hitting target model, and killing target model of killing element was put forward. Using the kinetics theory, the movement of kill element and target in the ground coordinates can be transformed into the relative movement of killing element in the target coordinates. Therefore, whether the target moves or not, the target vulnerability data can be directly used for killing calcula?tion. It provides a precise simulation model of killing some kinds of movable targets, such as helicopter for multi-purpose guided missile, and a powerful analysis tool for demonstration and design of new multi-purpose guided missile.

Application of Genetic Algorithm in Initial Alignment of Strapdown Inertial Guidance System

GU Hong-qiang, YUAN Ya-xiong, LI Bin

2007, 28(6):  677-681.  doi:10.3969/j.issn.1000-1093.2007.06.008

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In order to improve the precision oi initial alignment of strapdown inertial guidance system, extractive alignment method was presented by using genetic algorithm on the basis of rough alignment. The main manipulations of the algorithm were carefully selected for simulation according to the charac?teristics of initial alignment, and the simulation results were compared with the results from Kalman filtering. The comparative results show that the global searching ability of genetic algorithm used for initial missile alignment can greatly speed up the process to make the missile system react quickly to various situations, but the limit ox its local searching ability makes the algorithm less effective in some phases, thus it should be used together with some other algorithms with excellent local searching abili-ty in order to optimize the whole system.

Design of a Missile’s Attitude Tracking Controller Based on H∞ Robust Output Feedback

GU Quan-ying, SONG Jian-mei

2007, 28(6):  682-685.  doi:10.3969/j.issn.1000-1093.2007.06.009

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An attitude tracking controller based on Ho0 robust output feedback for a certain missile was designed by solving linear matrix inequality (LMI). On condition that the model parameters change se?riously, the parameters of a robust controller just including output feedback were obtained by solving LMI based on H00 criterion. In order to satisfy the applied requirement of the robust controller, it was modified and simulated by six freedom nonlinear mathematic model. The simulation results show that the robust output feedback controller possesses good performances of attitude tracking and antijamming.

Step-down-stress Accelerated Life Test Optimal Design

WANG Ya-shun, ZHANG Chun-hua, CHEN Xun

2007, 28(6):  686-691.  doi:10.3969/j.issn.1000-1093.2007.06.010

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A main challenge is how to design a step-down-stress accelerated life test plan of which the precise results are obtained with low cost. A novel method of optimal designs for step-down-stress ac?celerated life test was proposed by Monte Carlo simulation under the conaition that the closed form of the optimal solution can be difficultly obtained or not exist by the traditional method of analytic opti?mization in a certain case. In order to decrease compute efforts which may be very large in Monte Carlo simulation based optimal designs, a nonparametric surface fitting was incorporated into optimization by using continuity of object function for meeting the application requirements. The illustration demon?strates the applied process and validity of the method.

Optimization Design of Thermal Conduction Jinhanced Phase Change Material Plates for simulating the Infrared Signature of Steel Plate

YE Hong, JIANG Li-feng

2007, 28(6):  692-699.  doi:10.3969/j.issn.1000-1093.2007.06.011

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Phase change material (PCM) with large latent heat can be applied to the preparation of the infrared false targets for realizing all-weather passive infrared decoy, but its low thermal conductivity is a great blockage to simulating infrared signature of thick metal plates. For that reason, a method of simulating the infrared signature of thick steel plates was proposed by the thermal conduction enhanced PCM including the aluminum fins. A physical and mathematic model was set up, and the infrared sig?nature simulation of the thick steel plate was investigated numerically. The effect of the distribution density, thickness of fins and thickness of PCM plate on the simulation efficiency was discussed, and the reasonable construction parameters of PCM plate used to simulate the steel plate with different thickness were obtained.

Research on Fuzzy Optimization Model of Unmaintainable Spare Parts for Torpedo

LIANG Qing-wei, SONG Baowei, JIA Yue

2007, 28(6):  700-703.  doi:10.3969/j.issn.1000-1093.2007.06.012

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The determination of the spare part amount of torpedo is an important work of maintenance and relative to cost and spare part supportability closely. So the cost and the spare part supportability should be considered when the spare part amount is optimized. The fuzzy optimization model of the de-mand amount of unmaintainable spare part based on the analysis of the fuzzy characteristic of the spare part supportability was set up. The optimization results of spare part amount of the torpedo were ob?tained by the model and provided specific data. The results show that the method is a certain value to engineering application.

Study on Salvo of Submarine Launched Anti-submarine Homing Torpedoes for Obscuring Target Scatterance

ZONG Fang-yong, WANG Shu-zong, YANG Li-qiang

2007, 28(6):  704-708.  doi:10.3969/j.issn.1000-1093.2007.06.013

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There is a large target scatterance when a submarine launches anti-submarine acoustic hom?ing torpedoes with incomplete target motion essential or target motion essential which has a Dig error to attack a hostile submarine. In order to increase the target hit probability, the submarine should exe?cute salvo parallel to the course oi the torpedo for attacking the undewater target. Based on the above mentioned salvo method, the mathematic model of obsuring the target scatterance was established and the valid search width-to-the target scatterance projection width ratio was calculated at different tacti?cal situations and the salvo torpedo sums. The calculating results indicate that the salvo with two tor?pedoes can obscure the target scatterance at middle fire distance, and it will at least need four torpedoes in order to obscure the large target scatterance caused by large fire distance and big error of target mo tion essential. As the tactical presupposition is arbitrary, the conclusions possess universal significance for obscuring target scatterance of the torpedo salvo.

Analysis on Magnetic Torque of Superconducting Sphere with High Rotating Speed m Uniform Magnetic Field

HE Chuan, WANG Qiu-Iiang

2007, 28(6):  709-713.  doi:10.3969/j.issn.1000-1093.2007.06.014

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On the basis of the classic electromagnetic field theory and London equations, a calculation model was founded for the magnetic torque of a superconducting sphere with high rotating speed in a uniform magnetic field. By taking account of the interaction of the London moment produced by the rotating superconducting sphere with tne applied magnetic neia, calculation method of the magnetic torque was derived from the magnetic induction expressed in terms of spherical harmonic functions and the boundary condition of superconducting sphere. In addition, a calculating example is shown. The theoretical model for toque calculation is valuable for the farther research on the dynamic behavior of superconducting sphere with high rotating speed.

Design and Development of Aircraft Vulnerability Assessment Software System

PEI Yang, SONG Bi-feng, HAN Qing

2007, 28(6):  714-719.  doi:10.3969/j.issn.1000-1093.2007.06.015

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The basic aircraft vulnerability assessment methods were presented. A generic aircraft vul?nerability assessment software system was designed and developed. The system consists of five basic modules ： data input module, graphical display module, threat input module, calculation method and system setting module and results output module. The system can provide vulnerability assessment re?sults including the probability of kill and vulnerable area of aircraft or components at the single hit and multiple hits by nonexplosive penetrators of arbitrary aspect, the vulnerability at the threat of missile spray fragments, and the plotting of the blast vulnerability envelops at the typical blast planes of air?craft .Compared with the existing assessment software or programs, the developed system has the fol?lowing advantages ： I) taKing account of the ricochet in assessing the aircraft vulnerability at the threat of nonexplosive penetrators or fragments; 2) taking account of the effect of redundant components on the vulnerability at the threat of missile fragments; 3) providing the multiple output formats of assess?ment results. The above mentioned 1),2) advantages make vulnerability assessment more realistic. Application shows that the universal system is helpful to the survivability enhancement or vulnerability reduction design of aircraft, the system can also apply to the vulnerability assessment of cruise missile, satellite and armor vehicle, et. al.

Analytic Solution of Nonsteady Temperature Field in Rocks Acted by High Energy Burners

YAN Jun, YI Jian-zheng，CUI Hai-ping

2007, 28(6):  720-724.  doi:10.3969/j.issn.1000-1093.2007.06.016

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Based on the heat conduction theory of thick wall cylinder, the distribution of temperature field in rocks acted by high energy burners was calculated. The analytic solution of the instantaneous temperature field was deduced by Laplace transform and the introduced unit pulse function into the boundary condition to simulate the instantaneous shock characterisitc of high energy burners, the tem?perature field calculation was completed by the solution. The calculation results show that after the heat shock of high energy burners, the temperature field in rocks is distributed in the thin layer with a distance of several to tens of millimeters from the inner surface of a hole, the distribution of tempera?ture field tends to uniform with time, and the temperature field is affected by the radius of hole, 1.e. at constant outer radius, the smaller the hole radius is, the lower the temperature at the same point is, and the steeper the temperature gradient gets at the same time. The results provide a certain theoretic guidance for the design and application of high energy burners.

Combat Effectiveness Modeling and Evaluation of Hypersonic Cruise Missiles

YAN Dai-wei, GU Liang-xian, GUAN Qian-shan, SUN Ping

2007, 28(6):  725-729.  doi:10.3969/j.issn.1000-1093.2007.06.017

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In the conceptual design of hypersonic cruise missiles, the evaluation of the missile combat effectiveness is necessary to avoid excessive index in the missile performance requirements. The attack and defense engagement course and the faced threat in the operational mission profile were analysed for the missile. The top layer model of the combat effectiveness evaluation for the missile was established by the ADC method proposed with the weapon system effectiveness industry advisory committee (WSEiAC) in the U.S.，and the model was decomposed and improved reasonably. On the basis of analysing the every combat effectiveness index, the analytical models of the indexes of penetration ca?pability, hit probability and damage probability were established. The combat effectiveness evaluation results were given. The key factors that affect the effectiveness of missiles are discussed. The results show that reduction of the radar cross section (RCS) of the missiles can decrease the probability and the distance found by the radar; and the increase in the missile velocity can decrease both the fire prob?ability and the intercept damage probability of the defense system in the enemy side, consequently, in?creasing the combat effectiveness of the missiles.

Experimental Techniques and Analysis

Research on Surface Carburization of Tungsten Heavy Alloys

WANG Ling, LI Shu-kui, SONG Xiu-gang

2007, 28(6):  730-732.  doi:10.3969/j.issn.1000-1093.2007.06.018

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The tungsten heavy alloys were treated by solid surface carburization method and examined by microscope, SEM and X-ray, etc. The results show that the two carburization layers can be ob?tained at 950 C for 5 h In solid carburetant; the surface W2C layer with thickness of 170 pm to 200 /xm, hardness of HV388 to HV525 can improve surface hardness effectively; the tungsten grains in the secondary surface layer don’t change evidently, the carbide exists in the binding phase mainly.

Comprehensive Reviews

Advance and Challenge in Joint Target Tracking and Classification

SHAN Gan-lin, MEI Wei, WANG Chun-ping

2007, 28(6):  733-738.  doi:10.3969/j.issn.1000-1093.2007.06.019

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The technology of joint target tracking and classification (JTC) is one of the fast emerging research focuses in the field of information fusion. The basic idea of JTC is that the significant im?provements in performance of target tracking and classification can be expected by taking advantage of the two-way exchange of useful information between the tracker and classifier. After the presentation of the principle of JTC，existing JTC technologies were broadly categorized into two classes, that is, point-target-motion-model based JTC and rigid-target-motion-model based JTC，which were compared in detail. A review of the advance in the JTC technology was also given. The main difficulties and the opening problems of the JTC technology were presented.

Short Papers

Study on Vibration Reaming of Small Caliber Gun Tube with Auto Aligning Reamer

XING Li-hua, JIANG Xu-chu, LEI Bing-wang, LI Hong-yan, ZHANG De-yuan

2007, 28(6):  739-743.  doi:10.3969/j.issn.1000-1093.2007.06.020

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The mechanism of suppressing the formation of built-up-edge (BUE) of vibration reaming was studied. The vibration reaming experiments of a small caliber gun tube were carried out by the au?to aligning reamer. The influence of vibration reaming on surface roughness of gun tube was analyzed. The continuous cutting process of the conventional reaming was transformed into the pulsed intermit?tent cutting process, so that the continuous helical cmp of the conventional reaming was transformed into the minute acicular cell chip of the vibration reaming. The capability of chip-breaking and chip-re?moving of reaming was improved, tnerefore the formation of built-up edge was suppressed, which avoids the generation of plough ditch and scales of hole surface. The experimental results indicate that the surface roughness Ra of the vibration reaming is enhanced at least 3 levels than that of the conven?tional reaming; and the surface roughness Ry is less than one-fifth of the conventional reaming; The surface quality of gun tube is greatly improved.

Research Notes

Numerical Simulation of Airflow Field and Structure Improvement in Engine compartment of Armored Vehicles with Electric Transmission

WANG Xian-cheng, SUO Wen-chao, ZHANG Geng-yun

2007, 28(6):  744-748.  doi:10.3969/j.issn.1000-1093.2007.06.021

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When the mechanical drive is changed into the electric transmission, the cooling system of the engine compartment should be altered to meet the new requirement for the increase in equipment such as electric apparatus. In order to predicte and analyze the rationality of cooling system in the vir?tual engine compartment, the numerical simulation of airflow fields in the engine compartment by us?ing computational fluid dynamics (CFD) technique is necessary. An armored vehicle with electric transmission was taken as the research object. The physical model and mathematical model for the computation of 3D air flow and heat transfer in the engine compartment of an armored vehicle with electric transmission was established. Turbulent flow in the compartment was described by using the standard k-￡ two-equation turbulence model. The temperature and velocity fields of 31J air flow in the engine compartment were numerically simulated and analyzed based on different fan’s flux. A theoret?ical basis for determination of the fan’s flux was given by the simulation results. The positions of the air-vent shutter were analyzed. The simulation results show that the different positions of the air-vent shutter can lead to different cooling efficiencies.

Study of Soldier’s Air-conditioning Systems

ZHANG Xing-zhou, ZHONG Xiao-hui, WU Yu-ting, MA Chong-fang

2007, 28(6):  749-752.  doi:10.3969/j.issn.1000-1093.2007.06.022

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In a hot environment, the soldier’s air-conditioning system can cool the body of soldier. he reduced size and weight of miniature vapor compression system were obtained by adopting en?hanced heat transfer and low density material. A miniature vapor cycle refrigeration system as the cool?ing source of soldier’s air-conditioning system was developed. The miniature vapor compression refrig-eration system can provide 300 W cooling capacity, has dimensions of 270 mm X 260 mm X 120 mm, and weighs approximately 2.8d kg. This system can supply a comfortable micro-climate surrounding around the soldier in 40 °C hot environment to avoid heat stress. The system can provide a heat protec?tion for soldier.

Application and Developmental Countermeasures in Generalization, Modularization and Seriation for Products of Complex Small Arms

ZHOU Tao, SUN Chuan-jun, MA Lin, GUO Shi

2007, 28(6):  753-757.  doi:10.3969/j.issn.1000-1093.2007.06.023

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According to the features of products of complex small arms, the developmental countermea?sures oi tneir generalization, modularization and seriation were studied by the informatization and stan?dardization technologies integrated with a modern design method to implement the cooperative applica?tion and development of the three technologies for the small arms of total lifecycle. It is of great impor?tance to developing products of the small arms.

Study of the Best Technological Condition for Preparating Phenyl Carboxylic Acid with Phenyl Methanol

LI Min, CHEN Zhi-min, CHENG Xi-ying

2007, 28(6):  758-760.  doi:10.3969/j.issn.1000-1093.2007.06.024

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The phenyl carboxylic acid was prepared from the oxidized phenyl methanol by the calalyzed hydrogen peroxide with the amine hexadecane trimetnyl PW heteropoly acid used as the catalyst. The influence of reaction temperature, reaction period, hydrogen peroxide content and catalyst content on the yield rate of phenyl carboxylic acid was investigated. The results show that the yield rate of phenyl carboxylic acid is up to 86.3 % .

Research on Weapon Demonstration Methodology in Cost as Independent Variable

TAN Yun-tao, GUO Bo

2007, 28(6):  761-764.  doi:10.3969/j.issn.1000-1093.2007.06.025

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COSt as independent variable (CAIV) is a defense acquisition methodology of DOD, U.S. This methodology is an important tool that integrates the operaional effectiveness, costs and perfor?mance parameters in an effort to make a tradeoff and establish the cost goals of life-cycle phases. In a systemic demonstration of a new weapon system, the key technologies of CAIV include modeling of system cost and effectiveness, tradeoff study, and establishment of cost goals, etc. The above men?tioned key technologies were studied and the future research was forecasted.

Motion Synchronization of Electro-hydraulic Servo System

LI Chang-chun, MENG Ya-dong, LIU Xiao-dong, ZHOU Xin

2007, 28(6):  765-768.  doi:10.3969/j.issn.1000-1093.2007.06.026

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A 4-cylinders electro-hydraulic (EH) synchronizing system was designed, which can support a box girder of 900 tons. Position synchronization control method combined with force tracing control algorithm was put forward to keep the girder horizontal and supported by 4 cylinders averagely. The simulation results show that the system is effective.