Table of Content

31 December 2007, Volume 28 Issue 12

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Paper

Torque-regulating Control Strategy of Electric Tracked Vehicle Driven by Dual-motor

ZOU Yuan, SUN Feng-chun, ZHANG Cheng-ning

2007, 28(12):  1409-1414.  doi:10.3969/j.issn.1000-1093.2007.12.001

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To reduce control task and difficulty of dual-motor arive for speed-regulating control strategy of tracked vehicle, torque-regulating control strategy was proposed. Theoretical fundamentals and fea?sibility of torque-regulating control strategy were analyzed based on the dynamical cnaracteristic of tracked vehicle driven by dual-motor, signals of acceleration pedal, braking pedal and steering angle were mapped to control variaoies γ and ε? Torque-regulating control strategy was designed based on motor’s speed-torque characteristic. The model of tracked vemcle driven by dual-motor was established in Simulink/Stateflow environment, which is composed of the modules for input of driver, torque-reg?ulating control strategy, motor and controller, and vehicle dynamics. The feasibility and effectiveness of torque- regulating control strategy were proved, by results simulated in different road surfaces and worKing conditions and obtained in field experiment. Torque-regulating control strategy is applied to the vehicle successfully.

Numerical Simulation and Analysis of Matching Common Rail System with Combustion Chamber for Diesel Engine of Special Vehicle

HUANG Jun, WANG Xian-cheng, ZHANG Geng-yun

2007, 28(12):  1415-1419.  doi:10.3969/j.issn.1000-1093.2007.12.002

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3D working process model of aiesel engine on a type of special vehicle was built up and vali?dated through the comparison between calculated and experimental results. The numerical calculation and the analysis of matching the common rail system with the vertical and reentrant wall combustion chambers were made. The compared and analyzed results show that matching the modified combustion chambers with the common rail system can obviously improve the performance of the engine.

Fatigue Reliability Analysis and Simulation of Self-propelled Gun's Torsion Bar Under Random Loads

YI Dang-xiang, LIU Chun-he, ZHAO Shaoping,ZHANG Shi-nian, Lü Guo-zhi

2007, 28(12):  1420-1423.  doi:10.3969/j.issn.1000-1093.2007.12.003

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Virtual prototype for a self-propelled gun was built up and simulated to obtain the torque load of the torsion bar under various typical conditions. The design spectrum of the full life 2D fatigue stresses at the most dangerous fatigue failure position located m the root of spline tooth of torsion bar was obtained by finite element analysis, counting and evaluating, composing and extending. Consider?ing the randomness of the geometrical sizes and fatigue strength effect factors, we simulated the proba?bility density function of fatigue transverse stresses by Monte-Carlo sampling theory and 3-6-1 BP neu?ral network, and obtained the P-Sa-Sm-N curved surface equations. The essential difference between transverse and longitudinal randomnesses of fatigue and their computation methods were studied, and the fatigue reliability of torsion bar was analyzed by MTP Miner criterion theory. It is suggested that the mean kilometers between overhauls is 12 000 km.

Fatigue Life Prediction of Transmission Gear Based on Cooperation Simulation Technology

ZHANG Jing-zhu, CUI Qing-bin, XU Cheng

2007, 28(12):  1424-1427.  doi:10.3969/j.issn.1000-1093.2007.12.004

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The fatigue life prediction of complex components is always prior research emphasis of struc?tural design of antifatigue and armament maintenance support. The computer aided engineering (CAE) technology was introduced into armament fields. The use of cooperation simulation technology in armament fields was explored deeply. The cooperation simulation platform used for fatigue life pre?diction of gear was established. The fatigue life prediction of transmission gear was achieved by the in?tegration of four commercial softwares.

Nonlinear Thermo elastic Finite Element Analysis for Composite Material Barrel

XU Ya-dong, QIAN Lin-fang, CHEN Long-miao

2007, 28(12):  1428-1432.  doi:10.3969/j.issn.1000-1093.2007.12.005

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In order to study the thermo-elastic proolem of a composite material barrel, the nonlinear thermo elastic model was established by the nonlinear finite element method. The results, obtained through nonlinear thermo-elastic analysis for the simulated composite barrel, show the regularity of the influence of physical property parameter variation with temperature on transient temperature distribu?tion, transient thermal stress as well as natural frequency of the barrel, which provides theoretical foundation for dynamic thermal performance design of composite material barrel.

3D Numerical Simulation of Oblique Penetration of Antirunway Penetrator to a Multilayer Runway Target

ZENG Bi-qiang, JIANG Chun-lan, WANG Zai-cheng,CHANG Zhi-yuan

2007, 28(12):  1433-1437.  doi:10.3969/j.issn.1000-1093.2007.12.006

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The process of penetrating obliquely a multilayer runway with antirunway KE penetrator was numerically simulated by the finite element code LS-DYNA3D. The influences of the penetration velocity, angle, centroid of projectile and medium interface in the runway on penetration process were studied. The result indicates that the overturned angle of projectile could be reduced and the penetra?tion depth increases when the centroid of projectile is moved ahead; the existence of multilayer medium interface accelerates overturn, which is obvious at smaller penetration velocity and larger incidence oblique angle, changes overload response and aggravates stress concentration for the penetrator. The simulated results have reference value for the design of the penetrator.

2D DOA Estimation of LFM Signals Based on Fractional Fourier Transform and ESPRIT Algorithm

YANG Xiao-ming, TAO Ran

2007, 28(12):  1438-1442.  doi:10.3969/j.issn.1000-1093.2007.12.007

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A new method for 2D direction of arrival (DOA) of linear frequency modulation (LFM) sources was proposed by fractional Fourier transform (FRFT) and estimating signal parameters via ro?tational invariance technique (ESPRIT) algorithms. A new array model in FRFT domain was con?structed based on the fact that the LFM signal has the energy- concentrated performance in the FRFT domain, and the 2D DOA estimation of multiple LFM sources was realized by ESPRIT algorithm. Simulation results verify the correctness and efficiency of the new algorithm.

Vector Miss Distance Measurement of Body Targets

Li zhi-yu，WU Si-liang, WEI Guo-hua

2007, 28(12):  1443-1446.  doi:10.3969/j.issn.1000-1093.2007.12.008

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The effect of body target on vector miss distance measurement was proposed. A model of body target was given and the characteristic of Doppler frequency of the radar echo was analyzed. An algorithm of miss distance measurement of body targets was thus presented. Simulation results indicate that the principle of the algorithm is correct and can depress tne effect of body target on vector miss distance effectively to get its accurate estimation results.

Ultra-wideband SAR Landmine Detection Using Fuzzy Hypersphere Support Vector Machine

JIN Tian, ZHOU Zhi-min，SONG Qian,CHANG Wen-ge

2007, 28(12):  1447-1451.  doi:10.3969/j.issn.1000-1093.2007.12.009

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Air- or vehicle-borne ultra-wideband synthetic aperture radar (UWB SAR) can be used to detect landmines or minefields over large areas quickly, wmch is the present trend in landmine detec?tion. Yet it leads to too many false alarms in practical applications. In this paper, a fuzzy hypersphere support vector machine (FHS-SVM) landmine detector was proposed. The FHS-SVM forms a hyper?sphere in the high dimensional kernel feature space to separate landmine and clutters, where the fuzzy membership is introduced in the learning procedure to quantitatively represent the effects of misclassifi- cation risk difference between landmines and clutters and landmine buried environment varying on de-tector .The FHS-SVM is validated by the rail ground penetrating SAR (Rail-GPSAR) system field da?ta. The validated result shows that the FHS-SVM outperforms the conventional kypersphere-SVM (HS-SVM) and hyperplane-SVM (HP-SVM) in landmine detection.

Algorithm and Application of An Extended Adaptive Wavelet Transform

WANG Li-ping, FU Meng-yin, DONG Shao-jing

2007, 28(12):  1452-1454.  doi:10.3969/j.issn.1000-1093.2007.12.010

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A new extended adaptive wavelet transform method based on the Claypoole adaptive wavelet transform was proposed. The degrees of C5weldens interpolating polynomial from the odd to the positive integer were extended by the method to extend the choice of the vanishing moments of the wavelet. The extended adaptive wavelet and the adaptive wavelet were used for nltering the signal. The simu?lated results show that the extended adaptive wavelet transform can get ideal application effect and sup?ply more wavelets.

Research on the Incorporate Technology of Distributed Underwater Navigation, Orientation and Comunication

ZHANG Guang-pu, LIANG Guo-long, WANG Yan, FU Jin

2007, 28(12):  1455-1462.  doi:10.3969/j.issn.1000-1093.2007.12.011

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A large-scale combined network was proposed to position and navigate the underwater ma?neuverable objects by both the wireless radio communication and the underwater acoustic remote con?trol communication. The system can track the underwater object’s three-dimensional movement by the cooperation of the shipborne range finder, the surface radio remote buoy, the underwater transponder array, the radio base station and the display control computer, and control the remote underwater transponder by the combination of radio and underwater acoustic remote control communication and extend the systemic work range. A practical method of the underwater transponder array measuring was presented. The general design scheme, the theory of the underwater orientation and navigation, the method of signal processing were given. The results of the lake and sea trials show that the system is feasible and reliable.

Temperature Simulation Study of Missile Motor Propellant in Severe Environment

LIU Qun, JIANG Yi, HAO Ji-guang

2007, 28(12):  1463-1467.  doi:10.3969/j.issn.1000-1093.2007.12.012

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In order to analyze the influence of exceeding the initial room temperature criterion on a mis?sile motor under conditions of high and low temperatures, three-dimensional solid for every part of the first stage motor was simplified and modeled by the CFD method. After considering heat conduction, convection and radiation, the stationary simulation calculation was conducted by the fluid-solid coupled heat transfer method to obtain the temperature distribution at different temperatures in severe field en?vironment and theoretical basis used for adjusting the initial room temperature criterion. Through sim?ulating the model described in Reference [2], it could be determined that the results of the simulation are in accordance with that of the experimental data. Using the CFD method and the fluid-solid cou?pled method can provide both reference and basis for adjusting the temperature of missile motor propel-lant.

Numerical Calculation Study of Influence of Grid Fin Configuration Parameters on Aerodynamic Characteristics

WU Xiao-sheng, LEI Juan-mian, WU Jia-sheng

2007, 28(12):  1468-1472.  doi:10.3969/j.issn.1000-1093.2007.12.013

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The influence of grid number, web thickness and web cross-section shapes on the aerody?namic characteristics of grid fins was studied by a numerical simulation method based on computational fluid dynamics. The result indicates that when the numbers of grids are increased, both drag force and lift force are increased, the drag force is more significantly affected by grid numbers; the drag force is significantly affected by web thickness, the lift force is less affected by that, and the larger the web thickness is, the larger the drag force is; shaping the web cross-section of grid fin can largely decrease the drag force of grid fin, but less affect the lift force.

Structural Reliability Analysis Under Dead Load and Fatigue Load

QU Yong-wei, AN Wei-guang, AN Hai

2007, 28(12):  1473-1477.  doi:10.3969/j.issn.1000-1093.2007.12.014

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The iailure time of elements in structural system under dead load and fatigue load was stud?ied .I he dead load failure time and the fatigue iailure time of the first failure element in failure routes were analyzed, and the equations of safety margin under the two iailure times were established, the re-liability indexes under the two failure modes were calculated separately. Comparing the two reliability indexes, we obtained tne failure mode and the failure time of the first failure element. Based on the failure time of the first failure element, the residual strength and the cumulative damage of the non- iauure elements were analyzed, thus, the failure times of elements in iailure routes were obtained, the reasonable expression were provided for the establishment of the equation of safety margin. By the ex?ample it can be seen that the proposed method coincides with the engineering fact and is suitable for re?liability analysis of a structural system under dead load and fatigue load at the same time.

Fatigue Reliability Analysis of Truss Structure Based on Stiffness Decay

AN Hai, AN Wei-guang, GU Yong-wei

2007, 28(12):  1478-1482.  doi:10.3969/j.issn.1000-1093.2007.12.015

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The process of physical property decay of element is very complex under fatigue loads. The structural system that consists of the elements is not a simple topological structure, whose change of physical properties is more complex. In order to analyze quantitatively the structural stiffness reliability at different life cycles, it is important to establish the accurate formula of physical property decay. As viewed from damage mechanics, combining with the formula of theoretical fracture strength, using strain equivalent assumption and based on the model of residual strength decay, the formula of elastic modulus decay was deduced. Moreover, the formula of structural stiffness reliability decay was given under fatigue loads. By combining with stiffness matrix of truss structural system, the formula of joint displacement was deduced in different service life cycles and fatigue reliability index of structural stiff?ness was solved.

Experimental Study and Numerical Simulation of Secondary Shock Overpressure in Air

TIAN Jie, HU Shi-sheng, CHEN Jian

2007, 28(12):  1483-1488.  doi:10.3969/j.issn.1000-1093.2007.12.016

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The personnel injury inside shelter caused by the secondary shock overpressure can not be ig?nored along with the development of weapon. The attenuation of the secondary shock overpressure in air behind aluminum foam structure was studied by the designed explosion experiment equipment. Nu-merical simulation proved experiment results by LS-DYNA. The effect of different sequencing struc?ture of layered aluminum foam and steel plate on anti-blast was investigated by numerical simulation.

Numerical Simulation of Internal Flow-field in the Single Expansion Ramp Nozzle for High Supersonic Aeroengines

CHEN Yu-chun, SHANG Xu-sheng, WANG Xiaofeng，LI Jiang-hong

2007, 28(12):  1489-1493.  doi:10.3969/j.issn.1000-1093.2007.12.017

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Based on the flow field characteristic of the single expansion ramp nozzle for high supersonic aeroengines, the nozzle inner flow field was numerically simulated by 3D Navier-Stokes equations, three-order high resolution NND difference scheme and realizable k-e turbulence model, and the nozzle flow field parameter distribution was obtained. The calculated results show that the design of the type II single expansion ramp nozzle for the high supersonic aeroengines is reasonaole; varieties of the dif?fuse segment length and inclination angle of nozzle can affect the nozzle outlet flow-field.

A Rotor-magnetism- chain- observor- based Control Strategy for AC Asynchronous Motor Start-Brake Process

SONG Ying-hua, WANG Yun-kuan, YANG Yan, GONG Li

2007, 28(12):  1494-1497.  doi:10.3969/j.issn.1000-1093.2007.12.018

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In many applications of three-phase AC asynchronous motor to the power source, the control requirements focus on the rapid start-brake process of the motor, instead of the precision of the speed. With the research of the mechanical character of the AC motor, a control strategy for the start-brake torque controlled by adjusting the difference of speed which can be sampled through rotor-magnetism- chain-observer was proposed and realized by hardware platform based on TMS320LF2407A DSP. The experimental results show that the control strategy can expedite the start-brake dynamic process of the AC motor remarkably and the control schemes of the start-brake processes are feasible.

Harris Corner Detection-based Stereo Visual Odometry

PENG Bo, ZHOU Wen-hui, LIU Ji-Iin

2007, 28(12):  1498-1502.  doi:10.3969/j.issn.1000-1093.2007.12.019

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Conventional visual odometries have low-precision in the low texture regions and long dis?tance, and poor real-time performance. A method about visual odometry was proposed to estimate the motion information of the vehicle. It contains feature detection, feature matching, motion estimation and so on. To make the algorithm more precise, the epipolar geometry constraint, multi-frame track?ing and altera ole focus were applied. Moreover, to ensure the real-time performance and accuracy of the algontnm, Harris corner detection and combination of the linear and nonlinear least square method (LSM) were used. The experiments demonstrate that the method is valid.

Experimental Techniques and Analysis

Analyzing the Powder Selection Test of Coupling Interior Ballistics in Metal Storm

ZHANG Pei-zhong, GAO Ting, HANG Xiaochu

2007, 28(12):  1503-1506.  doi:10.3969/j.issn.1000-1093.2007.12.020

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It was presented that the coupling interior ballistics equations and subordinate work coeffi?cients were described by mean bore pressure, pill bottom pressure, bore bottom pressure, and the powder gas after-effect period was described by adiabatic equation for Metal Storm. The typical cou?pling interior ballistics parameters were computed and their physical phenomena were explained on the condition of equal powder amount and optimized powder. It is proved that the Sluhartsky correction formula is unsuitable for adjusting the powder amount in coupling the interior ballistic test; the interior ballistic computing program is needed to adjust the powder amount.

Study on the Dynamic Performance of a New Force Application System Used in Tank Gun Control System Approval Testing

CHEN Tao, YANG Zhi-tao, HE Chi

2007, 28(12):  1507-1511.  doi:10.3969/j.issn.1000-1093.2007.12.021

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In the approval test of tank gun control system(GCS), according to the requirements of con?ventional ordnance approval test, the required quantity and form of force should be applied on the tank gun barrel. Performance parameters of tank GCS were calculated by measuring the movement parame?ters of the gun and turret with applied force to provide the basis for the approval test of tank GCS. A new method of force application and measurement-control via the servo electric cylinder and force sen?sor was presented. I he force measurement- control system based on computer technology and its single passage force control experimental simulator were designed. Experimental research was accomplished for the dynamic performance of new force application system. The experimental results show that dy?namic performance can meet the requirements of user.

Research Notes

Numerical Simulation of Muzzle Flow Field Based on ALE Equation and Chimera Grids

JIANG Xiao-hai, LI Hong-zhi, FAN Bao-chun, CHEN Zhi-hua

2007, 28(12):  1512-1515.  doi:10.3969/j.issn.1000-1093.2007.12.022

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The muzzle flow field was simulated numerically by chimera grids and dynamic mesh based on ALE (Arbitary Lagrangian-Eulerian) equations and second-order precision Roe scheme. From the predicted results, the interactions among precursor flow field, muzzle blast flow field and high-speed projectile were discussed in detail. And a good qualitative agreement between the distributions of the predicted density gradient and the experimental shadowgraph was obtained.

All Solid-State Continuous-wave Yellow Laser at 583 nm

LU Yan-fei, ZHANG Xi-he, YAO Zhi-hai

2007, 28(12):  1516-1518.  doi:10.3969/j.issn.1000-1093.2007.12.023

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An all solid-state continuous-wave yellow laser at 583 nm made by nonlinear sum frequency of 1030 nm and 1341 nm lasers was presented,1030 nm wavelength was obtained from 4F3/2-4I9/2 transition in Yb:YAG and 1341 nm wavelength was ootained from 4F3/2-4I13/2 transition in Nd: Gd- VO4. TEMoo mode yellow laser of 440 mW at 583 nm was obtained by using a double cavity, type- II critical phase matching KTP crystal intracavity sum frequency mixing to 1030 nm and 1341 nm, and incident pumped power of 12 W in Yb: YAG and 8 W in Nd: GdVO4. The experimental results snow that the intracavity sum-frequency mixing is an effective method for 583 nm laser and it can be applied to other two laser crystals to obtain more all-solid-state lasers with different wavelengths.

Application of Infrared Horizon Detector to Attitude Measurement of Micro-air Vehicles

CAI Yu, LIU Jing-tao, YE Xiong-ying,ZHU Rong，ZHOU Zhao-ying

2007, 28(12):  1519-1522.  doi:10.3969/j.issn.1000-1093.2007.12.024

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The attitude movement parameters of micro-air vehicle (MAV) were measured by an in?frared horizon detector (IHD)，which is an absolute attitude measurement system and observes horizon through sight field. The design principle and method of testing of infrared horizon detector were pre?sented .A novel measuring methed of pitch and roll angles in full scale range can be realized by using a three dimensional configuration. The experimental results show that the detector has the advantages in small size, low cost and fast start-up, and is adapted for attitude measurement of small and micro vehi?cles.

Key Technology Analysis of Blended Control Caused by Lateral/ Aerodynamic Forces for Air Defense Missiles

LI Yu-lin, YANG Shu-xing

2007, 28(12):  1523-1527.  doi:10.3969/j.issn.1000-1093.2007.12.025

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Several successfully developed and abroad blended-control interceptors caused by lateral/ aerodynamic forces were contrasted and analyzed. Both the advantages and disadvantages ot immedia?cy- lateral-acceleration-control and moment-lateral-acceleration-control were analyzed qualitatively. Ne?cessity of roll control for the blended- control interceptors during the terminal guidance phase and its ef?fects on guidance accuracy were discussed. The blended control switcn-time and the formula for decid?ing the pulse motor number were given and discussed in detail.

Experimental Studies on Precision Grinding of Potassium Dihydrogen Phosphate Mono crystals

ZHANG Quan-zhong, GAO Hang, WANG Qiang-guo,WANG Bi-ling

2007, 28(12):  1528-1532.  doi:10.3969/j.issn.1000-1093.2007.12.026

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As potassium aihydrogen phosphate(KDP) has several weak points such as being soft, brit?tle and anisotropic from the point of view of machining, it is the most difficult machining material used for modern optical components. The effect of different grinding parameters on grinding force and sur?face topography was preliminarily revealed by the experiment of grinding KDP with the ordinary grinding wheels made from corindon and diamond resin. Theoretical calculation on the critical depth in grinding KDP crystal was given. Ultra-precision grinding for better surface topography of KDP mono- crystal was explored.

Design of Motion Planner Based on Subtraction Clustering and Adaptive Fuzzy Neural Network

DUAN Qun-jie, ZHANG Ming-jun

2007, 28(12):  1533-1536.  doi:10.3969/j.issn.1000-1093.2007.12.027

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By using the methods of subtraction clustering and adaptive fuzzy neural network, a sort of motion planner for the underwater vehicle was designed. According to the characters of the input and the output, by using the methods of subtraction clustering, the fuzzy system’s initial structure and pa?rameters were determined adaptively. It was put forward that fuzzy nerve system parameter was re?solved into the nonlinear premise parameter and linear conclusion parameter and recognized separately. By adopting the gradient descent algorithm and least square method respectively, the front and back parameters of the adapted fuzzy reasoning system were optimized, and the study efficiency of the pa?rameters was raised. The simulation results indicate that the planning of adaptive fuzzy neural network motion planner is better than that of the fuzzy control in the same simulation environment.

Method of Calculating the Magnetic Probe of Postural Angle Based on Genetic Algorithm

LI Hua, LI Qing-min

2007, 28(12):  1537-1539.  doi:10.3969/j.issn.1000-1093.2007.12.028

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In measuring experiments of warship ’s magnetic field by the use of several magnetic probes, many measuring data sets cannot be directly used for the modeling of warship ’s magnetic field because of the existence of magnetic probe postural angle. A method based on genetic algorithm (GA) was de?veloped to calculate the magnetic probe postural angle. I he results of simulation show that the method is valid.

Dynamic Tree Diagram Method for Calculating Aircraft Multiple-hit Vulnerability

HU Yi-fan, SONG Bi-feng, PEI Yang

2007, 28(12):  1540-1544.  doi:10.3969/j.issn.1000-1093.2007.12.029

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In the survivability/vulnerability assessment for aircraft, the kill probability and vulnerable area of aircraft at certain threat hits always require to be provided. Aiming at the continuous variation of the component overlapping regions of the aircraft with different shoot directions and attitudes at multiple hits, we proposed a dynamic tree diagram method for calculation for aircraft multiple-hit vul?nerability under the condition that the aircraft has many non-redundant components, redundant com?ponents and many component overlapping regions. The universal computation program was established and the calculating aircraft multiple-hit vulnerability was carried out by the program through an actual example. Ine results show that the method is correct, general, readily achieved and effective in the storage of the tree’s branches.