Table of Content

30 November 2007, Volume 28 Issue 11

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Paper

Semi-active Control and Simulation of Suspension Systems for Tracked Vehicles

YU Yang, WEI Xue-xia, ZHANG Yong-fa

2007, 28(11):  1281-1286.  doi:10.3969/j.issn.1000-1093.2007.11.001

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A semi-active control of vehicle suspension systems was presented. The vibration of tracKed vehicles running on a rough road surface has a bad effect on performance, smoothriding, operation sta?bility and motion safety of vehicles. The acceleration of suspension systems of tracked vehicles is a vital parameter describing the degree of vibration of tracked vehicles. A mechanical model and the corre?sponding differential equations of motion which consider the mass of wheels were established. And a group of new output variables describing the motions of suspension systems of tracked vehicles was pro?posed .Then by applying semi-active quadric form of optimizing control theory, the differences of mo?tion states of suspension systems were calculated before and after control under sine road excitation. Parameter analysis and numerical simulation show that the acceleration of suspension systems of. tracked vehicles can be well controlled by selecting the suitable controlling parameters.

Research on Variable Firing Interval of Certain Rocket Launcher Using BP Neural Network and Improved Adaptive Genetic Algorithm

CHEN Bing, MA Da-wei, CHEN Fei,LE Gui-gao，XU Shou-peng

2007, 28(11):  1287-1292.  doi:10.3969/j.issn.1000-1093.2007.11.002

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On the base of the establishment of a certain rocket launcher model, some samples for train?ing the BP neural network were got by using an orthogonal experimental method through the dynami?cal simulation. The trained neural network could simulate the nonlinear relation between firing interval and initial disturbance. The iirmg interval was studied and optimized to obtain a reasonable result using the improved adaptive genetic algorithm(IAGA) in conjunction with BP neural network. The results indicate that the cooperation of BP and IAGA can resolve a certain question which is not successfully resolved simply using the dynamical simulation. The optimized result can be used in the firing of a cer- tain rocket launcher.

Research on Two Kinds of Dynamic Models of Machine Gun System Considering Moving Action Mass in Receiver

HU Zhi-gang, NIE Hong, XU Cheng, WANG Ya-ping

2007, 28(11):  1293-1297.  doi:10.3969/j.issn.1000-1093.2007.11.003

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It is hard to consider the influence of action mass on dynamical properties of machine gun in simulation. Two kinds of dynamic models were established by means of flexible multi-body method and nonlinear FEM. Simulated accuracy and modeling method were analyzed in detail. finally the conclu-sion shows that the nonlinear FEM model is more accurate than the flexible multi-body model in the numerical investigation of machine gun iirmg system.

Safety Analysis of Indoor Firing of Anti-tank Missile

ZHANG Geng-yu

2007, 28(11):  1298-1301.  doi:10.3969/j.issn.1000-1093.2007.11.004

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The indoor launching characteristics of anti-tank missile and the possibility of injury to firers were analyzed systematically. The effect of change in physical and chemical environment caused by fir?ing the man-portable anti-tank missiles from narrow space, typically civilian buildings, on the living being was analyzed by the experiment. The analyzing results provide reference basis for design and em-ployment of man-portable missiles, which are firied from narrow fortification.

Numerical Simulation of Velocity and Spin Speed of Parachute-Spinning Projectile System

LIU Wei, TANG Qian-gang, KOU Bao-hua, YANG Tao, ZHANG Xiao-jin, ZHANG Qing-bin, GE Jian-quan

2007, 28(11):  1302-1305.  doi:10.3969/j.issn.1000-1093.2007.11.005

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The dynamic characteristics of parachute-spinning projectile system is extremely complex. Under auasi-steady hypothesis, the velocity and spin speed of the system were simulated by dynamics and computational fluid dynamics in order to study and control it. The flow fields of the parachute and the spinning projectile were simulated separately without considering the effect of horizontally stochas?tic wind on the system and the interaction of the flow iieids among the parachute, the cords and the spinning projectile. The simulation results are in agreement with the experimental data, which verifies that the accuracy of the numerical simulation model is ensured. The methods used in this paper can al?so be used in the design of other parachute-projectile systems.

Numerical Simulation of the Disturbance of Sandwicn Explosive on Jet

MAO Dong-fang, LI Xiang-dong, REN Dan-ping

2007, 28(11):  1306-1309.  doi:10.3969/j.issn.1000-1093.2007.11.006

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The process of penetrating into the sandwich explosive by the jet at different incident angles was simulated using 3D finite element code (LS-DYNA), and compared to the corresponding case without sandwich explosive. The simulation and the comparison show the following results. After the sandwich explosive ignites, the active panels have great disturbance ana incision on the jet, 1.e. they make the jet deviated and bended, the target impact point dispersed and the penetration capability de?creased. When the attack happens vertically, the disturbance is not obvious. For aslant penetrating, the sandwich explosive reduces the penetration capability by 58% ?75% . The disturbance capability increases with the increase of the impact angle.

The Preparation of Ultrafine Powder LaCoO3 via Stearic Acid Sol-Gel Method and the Effect of LaCoO3 on Combustion Characteristics of Nitramine Modified Double Base Propellant

WEI Zhi-xian, HU Chang-wen, LI Yan-bin,LIU Suo-en

2007, 28(11):  1310-1314.  doi:10.3969/j.issn.1000-1093.2007.11.007

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Ultrafine perovskite-type complex oxide LaCo〇3 was prepared with a sol-gel method using stearic acia as complexing agent. The product was characterized by differential thermal analyzer and thermal gravimetry(DTA-TG)，Fourier transform-infrared(FT-IR) spectrum, X-ray aiffraction(XRD) and transmission electron microscope (TEM ) . The effect of the two dry methods of wet gel on the product group degree was compared. The effect of ultrafine powder LaCo〇3 on the buring rate and the pressure exponent of nitramine modified double base propellant was primarily tested. Experimental re?sults show that well-dispersed perovskite-type LaCo〇3 ultrafine powder is able to De obtained easily when wet gel is dried with anhydrous sodium sulfate Na2S〇4 instead of evaporating slowly; when 1. 7 %(w) perovskite-type LaCo〇3 is added in the propellant, the burning rate of the propellant is en-hanced, the pressure exponent is decreased m the range of 3 ?18 MPa, and the platform burning be?havior appears in the range of 14?16 MPa.

Detection of Ultra-high Speed Moving Target Based on Matched Fourier Transform

CHEN Jian-jun, WANG Sheng-Ii

2007, 28(11):  1315-1319.  doi:10.3969/j.issn.1000-1093.2007.11.008

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Ultra-high speed moving target is a new case fallen across in modern radar target detection. An echo model of ultra-high speed moving target was established, and its effect on pulse Doppler pro?cessing was analyzed. A pulse Doppler processing method based on matched Fourier transform (MFT) was proposed. According to the characteristics of echo model, an algorithm was proposed to realize MFT-based ultra-hign speed moving target detection with light computation load, clear physical mean?ing and strong searching range pertinence. The simulation results show the validity of the algorithm.

A Fast PN Code Acquisition Algorithm with the Constraints of Low Input Signal Noise Ratio and Low Constant False Alarm Probability

AN Jian-ping, SHEN Ye-bing, WANG Ai-hua,LUO Chang-qing

2007, 28(11):  1320-1323.  doi:10.3969/j.issn.1000-1093.2007.11.009

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Pseudo noise(PN) code acquisition with very low false alarm and miss probability in a limit?ed period of time is required for the short frame burst-mode direct-sequence spread-spectrum (DSSS) communication systems. A novel noncoherent approach, based on multi-symbol accumulation-to-PN code acquisition and digital matched filters (DMFs), was proposed to solve the problem. It is an im?proved mode of the traditional DMF single dwell algorithm. By using the method of multi-symbol ac?cumulation, the proposed algorithm can increase the signal-noise ratio (SNR) of code phase detection statistics, so the mean acquisition time is greatly shortened under the constraints of low input SNR and low false alarm probability. Its performance in QPSK-DSSS systems was analyzed. The simulation re?sults show that the proposed algorithm is able to capture PN code fast under the constraints of low SNR and low false alarm probability.

Numerical Simulation on Influence of Struts on High Speed Spinning Ramjet Assisted Range Projectile Inlet

CHEN Xiong, ZHOU Chang-sheng, JU Yu-tao

2007, 28(11):  1324-1328.  doi:10.3969/j.issn.1000-1093.2007.11.010

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The complex flow field of nigh speed spinning bi-cone axisymmetric supersonic inlet with struts of solid rocket ramjet assisted range projectiles was numerically simulated by a block structure grid and second-order zonal solver method. The complex wave structures of adhesive flow fields at both sides of supersonic inlet at different spinning angular velocities, strut shapes and angles of attack relat?ed to critical status were achieved using the numerical simulation. When there are struts at the diver?gent part of high speed spinning mlet, the total pressure recovery coefficient and the kinetic energy co?efficient of inlet decrease, while the flow distortion index increases obviously. With the increase in an-gle of attack and spinning velocity, the performance of inlet decreases obviously.丄 he simulated results show that the performance is more dominant when an inlet with rhombic struts is used.

Numerical Simulation on the Explosion Effects in a Hangar Deck

SONG Wei-dong, WU Kai-teng, NING Jian-guo

2007, 28(11):  1329-1334.  doi:10.3969/j.issn.1000-1093.2007.11.011

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A 3D numerical model for a hangar deck was established by using MMIC3D. Numerical simulation on the flow field distribution was performed by adopting Youngs interface technology under the condition that the explosion happens after the warhead penetrates into the hangar deck. The shock wave distribution in the hangar deck was analyzed by employing Visc3D. Based on experimental re?sults, the pressure curves of different key points and some regularity results were given. The propaga-tion process of shock waves was clearly observed by cartoon processing after the explosion in the hangar deck. AU of these results were consistent with the physical phenomenon and the theoretical analysis, which is useful for understanding the physical process and explosion effects of the near field and the far field in the hangar deck. These results present valuable information for the efficient damage to the planes, crew and corresponding facilities in the hangar deck.

Research on the Processes of Explosive Dispersion and Formation of Water Cloud by a New Antidetonation Device in Limited Space

DING Jue, LU Zhong-bing, WENG Pei-fen

2007, 28(11):  1335-1339.  doi:10.3969/j.issn.1000-1093.2007.11.012

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The principle of a new antidetonation device is based on explosive dispersion. If fire and ex?plosion happen, water can be dispersed explosively to form water cloud to cover the whole firing zone, which can prevent the flame and shock wave from propagating. By comparison with tranditional spray?ing system, it has many advantages, such as rapid water cloud formation and larger water cloud vol?ume .The formed process of dispersed explosively water cloud was emphatically analyzed. Based on the computer fluia dynamics commercial software FLUENT, the processes of water cloud explosive disper?sion and the formation of water cloud were simulated numerically using Euler/Euler mode (two phase fluid model) in two-phase fluid dynamic theory. The profile of liquid droplet vector and the developing process of water cloud concentration with time and space were given by using two antidetonation de?vices, which provide a theory guidance for improving the antidetonation effect of the system.

3D Flight Path Planning Based on Bayesian Optimization Algorithm

FU Xiao wei, GAO Xiaoguang

2007, 28(11):  1340-1345.  doi:10.3969/j.issn.1000-1093.2007.11.013

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A Bayesian optimization algorithm for three-dimensional (3D) flight path planning problem was presented. The flight path was presented by a time sequence of velocity vectors whose elements are speed, heading and climb angle. Using a fixed time interval, this representation allows the plan?ning algoritnm to constrain the candidate solution to lie within the acceleration capability of the air ve?hicle .The Bayesian optimization algorithm is applied to implement explicit learning by building a Bayesian network of the joint distribution of viable candidate path genotype strings. The construct and conditional probabilities of the network indicate the qualitative and quantitative reiationsnip among the path genotypes. A multivariate K2 metric is designed to evaluate the network. A new set of path geno?type strings is generated by using the corresponding conditional probabilities. Ii the stopping conditions are not met, the conditional probabilities for all nodes in the Bayesian network are updated again using the current set of viable path genotype strings. Experimental results demonstrate that this approacn is effectively.

An Improved Prediction Method of Network Traffic Flow Based on Chaos Characteristics

LU Jin-jun, WANG Zhi-quan

2007, 28(11):  1346-1350.  doi:10.3969/j.issn.1000-1093.2007.11.014

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High-speed network traffic flow has a self-similarity characteristic which keeps in close con?tact with the attractor of chaos system. A new method basea on the reconstruction theory of phase space was presented to analyze network flow, and reconstruct a phase space which is equidistant and i- somorphic to network dynamic system by use of time sequence of network flow. The fractal dimen?sion, Kolmogorov entropy and the largest Lyapunov exponents of the reconstructed phase-space were calculated from the one dimensional time sequence of network flow, thereby demonstrating the chaos phenomena lied in Internet traffic. A prediction of traffic flow in high-speed network was performed, the maximum predictable time was computed by applying the method of largest Lyapunov exponents based on the Woif scheme and improved Wolf scheme. The simulation result shows that the prediction method based on the improved Wolf scheme has higher accuracy and reliability, and lays a foundation for preventing the network from congesting.

The Assessment Model of Armament Battlefield Damage Based on Bayesian Network

WANG Guang-yan, HU Qi-wei, WANG Run-sheng

2007, 28(11):  1351-1356.  doi:10.3969/j.issn.1000-1093.2007.11.015

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The battlefield damage of the components in an artillery was researched using computer sim?ulation in order to solve the assessing problem of battlefield damage without complete information. The correlation of component damage was analyzed, lots of data were obtained through simulation, and the correlation of each component was built using a statistical method. The correlation was expressed quantitatively using Bayesian network, and the Bayesian network was built in order to assist an assess?ment person to assess the battlefield damage.丄 he properties of the network were analyzed based on battlefield hypothesis, and the assessment process was demonstrated using Bayesian network.

Research on Intelligent Built-in Test Fault Diagnosis of More-electric Aircraft Electrical Power System

LIU Zhen, LIN Hui

2007, 28(11):  1357-1362.  doi:10.3969/j.issn.1000-1093.2007.11.016

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An intelligent built-in test (BIT) technology based on generalized learning vector quantiza?tion (GLVQ) neural network was proposed and applied to the BIT system of more-electric aircraft elec?trical power system (MEAEPS) . A power spectrum analysis method was employed to get the charac-teristics of BIT signals in frequency domain. In order to reduce the dimension of eigenvectors, the spectrum characteristics of BIT signals were compressed by using the wavelet packet decomposition, and the energy of each frequency-band was computed to form the final eigenvectors, which were used as learning samples to train the GLVQ neural network. Since the original GLVQ algorithm suffered from several major problems, some modifications were made and a supervised LVQ layer was added to the GLvQ network, whicK made the boundaries among the fault classes more discriminative than us?ing the GLVQ network alone. I he proposed method was applied to the BIT system of MEAEPS, and the results showed that the proposed method is promising to improve BIT performance of MEAEPS.

Research on Maneuver Agent with Autonomous Decision- Making Capability

YANG Ping, BI Yi-ming, SUN Shu-Iing

2007, 28(11):  1363-1366.  doi:10.3969/j.issn.1000-1093.2007.11.017

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During the maneuver operational simulation, the maneuver entities with fast response and decision-making capabilities to battlefield threat accord with realistic operations. A model of maneuver agent with autonomous decision-making function was proposed. It is made up of apperception, threat prediction, decision-making, learning and execution sections. A BP neural network model used to forecast threat was estabiisned. The decision model of agent was described with Markov decision pro?cess (MDP) ? Reinforcement learning is applied to the decision process, which makes agent choose op-timal strategy by observing and learning. Further, an improved SARSA (X) algorithm of reinforce?ment learning based on a special reward function was proposed. Simulation experiment shows the va?lidity of models and the efnciency of the algorithm.

Calculation Research on Ship Engine Compartment Noise Modelling Based on Statistical Energy Analysis Method

WANG Xian-cheng, ZHANG Jing, ZHANG Geng-yun

2007, 28(11):  1367-1372.  doi:10.3969/j.issn.1000-1093.2007.11.018

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An efficient method was presented for the prediction of structure-borne sound transmission in ship engine compartment structures. Statistical energy analysis (SEA) was used, and the equations of subsystems were also presented. In the method developed, the input power from engine surface ra?diated noise measurement was evaluated to acmeve precise data. The theoretical formula was used to estimate the parameters of SEA. The effectiveness of the present method was illustrated by the com?parison between the predictive value and the actual measurement. The comparison result shows that the calculation value of engine compartment noise level is 93.8 dB(A), which is lower than the test value by 2.9 dB(A) ; the maximum error is 4 dB(A), the minimum is 0.3 dB(A) at main frequency band of 315 Hz; the predictive curve accords with the actual.

Rough Petri Net and Its Application in Multi-state System Reliability Estimate

YUAN Ju-mei, HOU Chaozhen, GAO Lin,WANG Xiao-yi

2007, 28(11):  1373-1376.  doi:10.3969/j.issn.1000-1093.2007.11.019

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A rough Petri net based on knowledge base system was proposed, which integrates the fea?tures of rough set theory and Petri net. It was applied in multi-state system reliability estimate. The dependence extent of system states on component states, and the importance of the component states to the system states were obtained from the knowledge base by applying the rough set theory, and deci?sion-making rules were extracted. A state vector norm with weight was defined. System states were approximate monotony increasing function of the norm, by which the arc weight and transition thresh?old function of Petri net were determined. System reliability was estimated by Monte Carlo method. So the state dimension is lowered in the reliability analysis of the polymorphous system.

Research on Distance Measuring Method of Laser Tracking System and Its Application

XIE Chi, ZHOU Zhao-fei, CAI Peng,ZHANG Tao

2007, 28(11):  1377-1381.  doi:10.3969/j.issn.1000-1093.2007.11.020

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A distance measuring method of the laser tracking system was presented for measuring the geometry and shape of large workpiece. After the two-frequency light signal produced by bimodal hot- steady frequency He-Ne laser is beaten, the beating-wave length is taken as “light size” . The number of beating-wave point can be determined from a beating-wave zero position after beating the light wave, and the partial wave length can be also measured by the two-frequency laser interference using a coaxial light path. An adaptive tracking method is used for laser tracking and positioning, and control?ling the moving of reflecting mirror along horizontal axis and vertical axis. For a locating signal, the angle offset between incident light and exit light is obtained by a CCD sampling unit. Then, tKe abso?lute distance measurement in large size machining can be realized by the driving system making two light-grating coders to control and. track the reflecting mirror. The laser tracking system Kas very kigh measuring precision, fast tracKing speed and anti- interference capability.

A Finite Automaton-based Two-dimensional Sound Ray Tracing Method

SUN Wan-qing, GE Liang

2007, 28(11):  1382-1387.  doi:10.3969/j.issn.1000-1093.2007.11.021

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A two-dimensional sound ray tracing method was presented, which can deal with the prob?lems, such as reflection, refraction, all-reflectiom, and help to find the sound ray trajectories rapidly. At each step of ray tracing, the sound velocity profile was supposed to be a function of the water depth, and the ray trajectory was obtained by deploying Snell’s law. A finite automaton (FA) was used to build up the shallow water ray tracing model, and the model state, transition, event and action were analyzed. Also, a method was used to find the eigenray. At last, its correctness was validated by comparing the numerical value and analytic value of special sound velocity profile, furthermore some problems in the course of applying the method and under solution in the method were discussed. The numerical simulation results show that the method is more reliable to find the sound ray trajectories in shallow water, with its numeric precision being about 10 4. The application of this method is prospec-tive in many cases, such as matched field tomography, source location and ray tracing in other fields.

Research on Harmonic Current Detection Method Based on Unit Power Factor for Ship Electric Power Systems

ZHAO Huai-jun, SONG Qian-nan, QIU Zong-ming, CHEN Ming

2007, 28(11):  1388-1392.  doi:10.3969/j.issn.1000-1093.2007.11.022

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With the development of ship electric power propulsion systems, we pay a good deal of at?tention to the harmonic problem of ship electric power systems. Considering the frequent change in the loads of the ship electric power systems, this paper presented to use the shunt active power filter based on unit power factor ( UPF) harmonic current detection method for harmonic suppression ? A detection delay problem exists if a conventional low-pass filter is used to detect harmonic current. The paper pre?sented an improved UPF harmonic current detection method. It used slipped-window integrator in?stead of the low-pass filter to detect harmonic current. MATLAB/SIMULINK results indicate that the modified technique improves the transient performance and has the capability of detecting UPF harmonic current in real time. The proposed technique used for a shunt active power filter experimen?tal prototype based on DSP is developed, the experimental conclusions validate that this modified de-tection method is feasible and effective.

Research Notes

Research on Objective Evaluation Criterion for Ride Comfort of Off-road Vehicles

WU Zhi-cheng, CHEN Si-zhong, YANG Lin,ZHANG Bin

2007, 28(11):  1393-1396.  doi:10.3969/j.issn.1000-1093.2007.11.023

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There are main two types of evaluation systems for ride comfort of wheeled vehicles. One e- valuation systen, includeing ISO 2631 and other similar standards, is generally used to evaluate the comnen vehicles, the another based on two limits, 1.e. 6 W average absorbed power and 2.5 g vertic I acceleration peak, is used to evaluate military vehicles by U.S. army and NATO. The practice of U. S. army in the past testified that the evaluation method based on limits is proper and built on tests. As the ride comfort evaluation of off-road vehicle is similiar to that of military vehicle, it is feasible to eval?uate the off-road venicles by using the evaluation method based on limits.

Numerical Simulation on Jet Formation of a New Star Shaped Liner

WANG Zhi-jun, WU Guo-dong

2007, 28(11):  1397-1400.  doi:10.3969/j.issn.1000-1093.2007.11.024

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A new star cone-shaped liner was investigated. It is a shape charges with star-shaped liner by changing charge structure based on wedge-shaped liner. lhe liner is constitute of several symmetri?cal cuneiform liners and concentration at their one end. A nonlinear finite element software was used to complete the numerical simulation of the star liner forming jet under explosion load. The result shows that the new liner can form jet and achieve expected result. The research result can provide a new se?lection for new style shaped charge warhead and has a feasible future in the field of anti-armor war?head.

Design and Development of Composite Aircraft Battle Damage Repair Simulation System

PAN Qing-jun, XIONG La-sen, LIU Xiao-shan

2007, 28(11):  1401-1404.  doi:10.3969/j.issn.1000-1093.2007.11.025

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Survivability and battle damage assessment of aircraft under tne threat of enemy missiles are of significance for aircraft battle damage repair ( aBDR) . The composite ABDR simulation system of an aircraft in our army under the threat of air-air missile was designed and developed. The survivaDle probability and battle damage of the aircraft can be obtained by simulation. By assessing battle damage and analyzing damage mode, repair project can be made. The results can be applied to make a quick re?covery of damaged aircraft, advance the battle effectiveness, and arrange the repair person and accesso?ry resource reasonably in time of war.

Evaluation of Minelaying Plans Based on Ideal Plans

TENG Zhao-xin, ZHANG Xu, QIAN Jiang

2007, 28(11):  1405-1408.  doi:10.3969/j.issn.1000-1093.2007.11.026

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Decision optimization is a major problem with operational plan, which relates to many ele?ments, and it is usually multi-objective. The optimizing process is very complicated. A gray correlation analytic method based on ideal plans is discussed. By combining the gray correlation analysis witn ideal plans, the quantitative calculation is performed to achieve the best plan from a number of plans, reduc?ing the random of subjective, and making the operational plan decision more rational. The damage probability and vitality calculating models are established, and used for the evaluation of realistic plan. This method could provide the decision support for the optimization of operational plan, and has preferable practicability.