Table of Content

30 June 2008, Volume 29 Issue 6

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Paper

Prediction of Temperature for Armored Vehicles Power Device Using the Network Method

WANGPu-kai，BI Xiaoping, HUANG Xiaohui

2008, 29(6):  641-644.  doi:10.3969/j.issn.1000-1093.2008.06.001

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The network method used to predict the temperature of armored vehicle power device was developed, the network model and the whole calculation flow chart were presented. Using the Dound- ary of lubricant flow, liquid coolant flow, air coolant flow and other necessaries, the comparison be?tween predicted and tested parameters was carried out, the temperature distribution of power device was presented, the temperature change of high temperature positions with the engine rotation speed and environmental temperature was displayed. All the results show that this method is convenient and effective and has thus more practical meanings.

Numerical Simulation and Optimized Physical Design of a Muiti-stage Reconnection i_run

ZHAO Chun, ZOU Ji-yan, HE Jun-jia,LI Xiao-peng，ZHOU Zheng-yang

2008, 29(6):  645-650.  doi:10.3969/j.issn.1000-1093.2008.06.002

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Reconnection gun is a form of electromagnetic gun that utilizes the magnetic field line recon?nection to accelerate a projectile. The force on the projectile is proportional to the product of the induc?tance gradient and the square of the circuit current. Combined with the data measured from the launch apparatus, the numerical simulation model of the projectile motion course was established on the basis of the circuit equation and the motion equation of the reconnection electromagnetic launch. To solve the problem of insufficient acceleration and launch efficiency decrease resulting from the projectile hy?pervelocity, an optimized physical design principle for the multi-stage launch was presented. The pro?jectile velocity and the launch efnciency can be greatly improved by the above principle, with whicn the oscillating cycle of the circuit current in every stage and the capacitance and the initial voltage of the capacitor bank are determined according to the projectile velocity, and adopting the triggered vacu?um switch (TVS) as the closing switch which has special arc extinguishing performance.

Exterior Ballistic I heory and Numerical Simulation for a Ramjet Propelled Projectile

XIANG Min, ZHANG Wei-hua, WANG Zhong-wei

2008, 29(6):  651-656.  doi:10.3969/j.issn.1000-1093.2008.06.003

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The range extended theory of a ramjet propelled projectile was simply presented, and the ex?terior ballistic trajectory prediction model was established, which incorporates the inlet with the ram?jet. Based on the model, the trajectory of a 155 mm projectile was numerically simulated. Through the analysis of the results, the relation curves between the range of the projectile and some design variables were attained. The conclusions are available for the optimum design of a ramjet propelled projectile.

Experiments and Numerical Simulation of Small-scale Slapper Driven by Electrical Explosion

WANG Gui-ji, JIANG Ji-hao, DENG Xiang-yang, TAN Fu-li, ZHAO Jian-heng

2008, 29(6):  657-661.  doi:10.3969/j.issn.1000-1093.2008.06.004

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Based on the low inductance technology and parallel-plate transmission principle, an experi?mental apparatus of small-scale slapper driven by electrical explosion was designed and established, which was used to initiate primary high explosives. The problem of instantaneously and continuously measuring the velocity of the small-scale slapper was successfully solved with the technique of laser in?terference .The measuring results were compared with the experimental and numerical simulation re?sults published abroad. The contrast results show that the experimental results properly reflect the physical process of electrical explosion driving slapper. One-dimensional numerical simulation of electri?cal explosion driving slapper was done using the hydrodynamic code. The computed results is consis?tent with the experimental one wmch was discussed.

CCD Laser Theodolite Automatic Tracking Algorithm and Software Implement

XU Jing, YANG Hua-ming, FANG Ming,TONG Shou-feng

2008, 29(6):  662-666.  doi:10.3969/j.issn.1000-1093.2008.06.005

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At present, laser theodolites can only measure static objects, and not measure moving ob?jects. But in fact it is often applied to measuring moving objects. A new method was proposed by CCD laser theodolite and image processing software to implement a laser theodolite with automatic tracking function, and the laser theodolite was used directly to adjust the ship-carried radar. The structure and the value of automatic tracking objects CCD laser theodolite were given, the procedure of sampling, recognizing and tracking of the targets, and the procedure of data post-processing were described in de?tail. A group of experience data was analyzed, the analyzed result proves that the method is satisfied with the measure precision.

Application of MFRFT to the Shamir's Three-pass Protocol

XIN Yi, TAO Ran, WANG Yue

2008, 29(6):  667-672.  doi:10.3969/j.issn.1000-1093.2008.06.006

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For extending Shamir’s three-pass protocol to more fields, a novel implementation of the protocol was presented by MrRFT operator group and its commutative property. Secrecy can be ob?tained after three pass with no advance distribution of any key. The new implementation's security was studied, with which a novel protocol providing identity authentication is also presented to promote the practicability, and authorized users participate in the three pass with same concerted permutation matrices, which resists impostor sharing the secret. simulations verify the validity of the proposed ap- proache.

A Novel MEMS Single Vector Hydrophone

CHEN Shang, XUE Chen-yang, ZHANG Bin-zhen, XIE Bin

2008, 29(6):  673-677.  doi:10.3969/j.issn.1000-1093.2008.06.007

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A novel underwater acoustic receiving transducers—micro-electro-mechanical-system (MEMS) single vector hydrophone was designed and fabricated by means of theory of piezoresistive ef?fect and MEMS technology. It is desiraoie that the application of piezoresistive effect and ingenious structure to single vector hydrophone may improve the low-frequency sensitivity and its miniaturiza?tion. The microstructure of the hydrophone was statically simulated by ANSYS, fabricated and encap?sulated by MEMS technology, and measured both by vibration-platform and underwater standing wave field. The experiment results show that fabricating vector hydrophone based on theory of piezoresistive effect and MEMS technology is feasible. This kind of hydrophone has several advantages such as small volume, light weight, simple structure, and directional pattern in the form of “8” with which the a- coustic source in underwater horizontal plane can be detected directionally by single vector hydrophone.

Camouflage Effectiveness Test Based on Optical Remote Sensing Imaging Simulation Software

GU You-lin, QIAO Yan-li, YI Wei-ning, XUN Li-na

2008, 29(6):  678-682.  doi:10.3969/j.issn.1000-1093.2008.06.008

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A camouflage effectiveness test method based on optical remote sensing imaging simulation was proposed, which is better than the former test methods. Land classification thematic map obtained by using ISODATA method of unsupervised classification based on high resolution satellite data, was deployed by true and camouflage objects and converted into a ground reflectance image through re?flectance conversion based on a ground object spectral library. Through atmospheric correction carried out by the atmospheric transmission software MODTRAN, satellite remote sensor radiometric calibra?tion coefficient, and sensor modulation transfer function (MTF), satellite remote sensor output image was obtained from a ground reflectance image. Detection probabilities under various circumstances were obtained by analyzing the output simulation image. The simulation results show that the proposed simulation method based on optical remote sensing imaging can provide an effective means for detecting camouflage effectiveness.

Research on Subarray Algorithm of Twin-line Array Sonar

WANG Hua-kui, HUANG Hai-ning, YE Qing-hua,ZHANG Chun-hua

2008, 29(6):  683-689.  doi:10.3969/j.issn.1000-1093.2008.06.009

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The conventional-then-adaptive (CTA) algorithm was studied considering signals from far- field sources with twin-line array sonnar. The directivity function of conventional beamforming was deduced, and the port/ starboard discrimination with the delay-sum and aelay-subtract beamformings was studied for twin-line array sonar under the ideal status. The CTA algorithm was proposed, its ex?pression was deduced, and its flow chart was given for twin-line array sonar, taxing aim at the poor space discrimination performance with delay-sum and delay-subtraction beamformings, the high cost of computation with the minimum variance distortionless response algorithm wmch is hardly applied to the practical system in spite of having nigh resolution. The researched results theoretically show that the CTA algorithm has low cost of computation, narrow beam, high space discrimination perfor?mance, high port/starboard discrimination performance. The sea trial results proved the research re?sults to be correct.

Design, Simulation and Optimization of Sensing Chip of High-g- Three-axis MLMS Accelerometer

ZHANG Zhen-hai, LI Ke-jie, REN Xian-ren, LIU Jun

2008, 29(6):  690-696.  doi:10.3969/j.issn.1000-1093.2008.06.010

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High-g three-axis MEMS piezoresistive accelerometer was developed in order to measure in?tegrated accelerometer signal of the penetration process of the body oi the missile of hard-target pene?tration weapon. A new design project of E shape diaphragm structure of central single proof mass of accelerometer was put forward. The accelerometer’s structure and working principle were discussed in details. This design can measure the acceleration in three-axis directions by means of three sets of Wheatstone bridges which are disposed on the sense chip reasonably. The perfectly structural size of the sense cnip was fixed by finite element analysis software. Simulation and optimization of the sense chip were implemented, by zero-order rough optimization algorithm and first-order gradient algorithm. The results indicate that the sensing chip of triaxial accelerometer have great capability of bearing over loading under 2 X IO5 g's peak shock acceleration, the property of high frequency response with 231 kHz, high sensivity and so forth. Finally, the prototype of triaxial accelerometer is developed. The initial tests verify that the accelerometer can fulfill high-g three-axis acceleration measurement.

Study of Real-time Wave Simulation in Virtual Battlefield Environment

YAO Hai, BAO Jin-song, JIN Ye

2008, 29(6):  697-702.  doi:10.3969/j.issn.1000-1093.2008.06.011

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In order to realize real-time wave simulation in virtual battleneid environment, a novel method was put forward to simulate ocean waves based on different sea state levels. Double summation ocean model was established by using three dimension irregular short crested wave theory, and its fre-quency spacing was determined by energy in parts; considering influence of view — frustum and screen resolution rate, vertex clustering simplification algorithm was imorovea by partitioning visual spatial through assigning different weights for vertexes of wave grids. Based on the created wave moael and the results show that the method is effective in simulating real-time wave movement under different sea state levels, especially for medium scale deep water area.

Study of Catch Probability Optimization for Anti-ship Missile on Soft-killing Condition Based on PbO

WANG Si-fu, QIANG Wen-yi, LIU Yong-cai,GUAN Shi-yi

2008, 29(6):  703-708.  doi:10.3969/j.issn.1000-1093.2008.06.012

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Dilute chaff is an important soft-killing countermeasure which may deteriorate the catching capability of anti-ship missile. Mathematic models were built up based on the description of target- catching progress for anti-ship missile, in which the velocity direction error is introduced in order to cover its effect on catching probability, especially on soft-killing confrontation conditions. The rela?tionship between catching capability and system parameter was statistically analyzed through Monte Carlo simulation. The prediction model of catching probability was o Dtained by uniform experiment de?sign and BP neural network on the confrontation condition. The catching probability was optimized by particle swarm optimization (PSO) and the parameters effecting on the probability were assigned in a coordinated fashion under the condition.

Study on the Influence of the Launcher Support Stiffness on Rocket Initial Disturbances

XU Wei-guo, BI Shi-hua, CHEN Zhen

2008, 29(6):  709-712.  doi:10.3969/j.issn.1000-1093.2008.06.013

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The relation between some rocket launcher support stiffness and the initial disturbances of the rocket was studied by the method of combining the multi-rigid-body dynamics simulation with the experiment implemented by designing launcher with adjustable support stiffness and using optical lever measurement. The results show that the launcher support stiffness can affect the initial disturbances of test rocket, and along with the change of launcher support stiffness continuously, there are the ex?treme point on the curve oi initial pitching velocity of the rocket.

An Approach to Assess Weapon System Effectiveness Based on Damage Analysis of Oooosed Object

LIANG Yan-gang, CHEN Lei, TANG Guojin

2008, 29(6):  713-717.  doi:10.3969/j.issn.1000-1093.2008.06.014

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Since weapon system effectiveness can be evaluated by measuring the damage of its opposed object, an approach to assess weapon system effectiveness based on damage analysis of opposed object was presented. The multi-valued damage tree was established to analyze functional damage and compo?nent damage of opposed object under combat conditions. Damage classes and logic operators were de?fined to represent different damage degrees and the relationships of the events with different damage classes in the damage tree respectively. Finite state macmne models were employed to accomplish quantificational analysis of damage tree and to calculate probabilities of top event. Then the conclusion of weapon system effectiveness was obtained. The approach was aoplied to a kind of missile system by the actual example to assess its penetration effectiveness and the result was given.

Load Analysis on Missile Erection

YAO Xiao-guang, GUO Xiao-song, FENG Yong-bao, MA Chang-Iin, ZHAN Jin-chun

2008, 29(6):  718-722.  doi:10.3969/j.issn.1000-1093.2008.06.015

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The computational models of the gravitational moment for the erection mechanism, the wind .load with the parallel direction to the erection plane, and the erection force of the cylinder, in erection process were set up according to the prescribed rotational motion and the rotational differential equation of the erection mechanism. In view oi the non-linear and time-varying characteristics of the computa?tional models, the models were simulated by Runge-kutta method with variable steps in Matlab/ Simuiink，and the time-varying simulation curves of erection angle, wind moment, erection force and other parameters were obtained graphically. The characteristics of the parameters such as the erection angle, no-rod end flow of the cylinder, wind load, and erection force were studied quantificationally by analyzing the simulation curves. The research conclusions can offer references for design and optimiza?tion of hydraulic and control system of the erection system.

Robust Vondrak Filter Design and Its Application in Gross Error Detection

GU De-feng, SUN Lei, YI Dong-yun

2008, 29(6):  723-727.  doi:10.3969/j.issn.1000-1093.2008.06.016

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The robust Vondrak filter model was established by analyzing the principle of the filter and adding a penalty function with which the influence of the gross errors on the curve fitting is sup?pressed. An iterative solving algorithm of the model was given. The robust estimation of the original signal was obtained by the model and the algorithm under tne condition of existing the gross errors, and the gross errors were detected by the estimation residual error. The gross errors were detected by the simulation and the experiment. The detected results prove the robust Vondrak filter to be correct and valid.

Dynamic Compression Characteristics of Mg65Cu20Ag5Gd10 Bulk Amorphous Alloy

CHENG Huan-wu, LI Jie-qiong, WANG Lu,SHAO Chang-xing, ZHANG Hai-feng，WANG Ai-min

2008, 29(6):  728-730.  doi:10.3969/j.issn.1000-1093.2008.06.017

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The dynamic compression testing of Mg65CU20Ag5Gd10 bulk amorphous alloy was done by split Hopkinson pressure bar (SHPB) at the scope of strain rate of 102?103s-1 The fracture mor?phologies of Mg65CU20Ag5Gd10 bulk amorphous alloy were studied by scanning electron microscopy. The results show that the most fracture strength value is 704 MPa of the Mg65CU20Ag5Gd10 Gdio bulk amor?phous alloy under dynamic compression and no macro-plastic phase during deformation process; the fracture strength of Mg65CU20Ag5Gd10 bulk amorphous alloy has rise trend with a rise in the air pres?sure of shooting bullet, the fracture strain falls with a rise in compression load; the cleavage step exists on the fracture which proves the Mg65CU20Ag5Gd10 bulk amorphous alloy to be brittle fracture, mean?while the strip pattern and slip area are found on the fracture morphology.

Modeling and Simulation of Battlefield Damage Assessment for Submarine Combat System Based on Damage Analysis and ER Algorithm

LIU Bo, MA Liang, LIU Guoqing,FAN Hong-da, ZUO Hao

2008, 29(6):  731-734.  doi:10.3969/j.issn.1000-1093.2008.06.018

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A new battlefield damage assessment (BDA) architecture of submarine was proposed based on study of evidence reasoning (ER) algorithm and battlefield damage analysis technique. Within the architecture, assessment results of damage analysis technique and expert judgments were combined and simulated. The simulated results show that the BDA architecture of submarine significantly improves the veracity of the assessment and reduces uncertain information of subjective judgments. The model is an effective tool of submarine BDA.

Design and Development of KBE System Based on Struts

WANG Feng, YAN Yan, ZHAO Bo

2008, 29(6):  735-740.  doi:10.3969/j.issn.1000-1093.2008.06.019

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Struts is a ripe J2EE frame in the web application at present. The structure of Struts and the concept of knowledge-based engineering (KBE) system were introduced briefly. On the basis of analyzing and summarizing the limitation of the past product design, the thouglit of the KBE system based-on Struts was proposed, which uses Struts for the systemic frame integrating relevant application software, and introduces the thought of KBE into the design process of products. The developed KBE system, wmch took the oil-gas as an instance, proved itself to be feasible and high efficient to develop?ing products.

Research on Linear Accuracy Evaluation Method of a Micro-manipulation Platform

YE Xin, ZHANG Zhi-jing, WANG Qiang,SUN Yuan

2008, 29(6):  741-745.  doi:10.3969/j.issn.1000-1093.2008.06.020

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The parallel micro-motion platform is widely used m hign-precision applications. Consider?ing that some accuracy analysis methods of traditional parallel mechanisms, which can not quantifica?tionally reflect the accuracy of micro-motion platforms overall, are still used in micro-motion area, it is necessary to discuss the issue in detail. To specify it, taking a 6-DOF micro-motion platform for in?stance, the Jacobi matrix of the input and output poses was obtained by the validated differential method. The concept of accuracy coefficient was proposed, by which the pose accuracy of the platform in its workspace can be estimated. The error simulation example indicates that the accuracy analysis method, is doable.

Novel Microelectroforming Technique with Assisting Low Air-pressure Alternately and Temperature-gradient

MING Ping-mei, ZHU Di, HU Yang-yang,ZENG Yong-bin

2008, 29(6):  746-751.  doi:10.3969/j.issn.1000-1093.2008.06.021

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Microelectroforming for ultra-deep or high-aspect-ratio (HAR) features is one of the most important technical keys to fabricate metallic devices of microsystem as well as semiconductor vias. A new microelectroforming technique using assisting low air-pressure alternately and temperature-gradi- ent surroundings in the bath was introduced. The related theories and mechanism were reported, and further experiments were carried out using special equipment newly developed by oneself to demon?strate the feasibility of the exploited technique. The morphology and the effective factor of the micro- electroforming coil were analyzed. Research results show that comparing with conventional electro?forming process, the proposed process can reduce gas void, enhance electro-filling deep-electroforming ability, and improve morphology guality greatly.

Research Notes

Research to Coupled Characteristic of After-Effect Period in Antimissile Metal Storm

ZHANG Pei-zhong, GAO Ting, HANG Xiao-chu

2008, 29(6):  752-755.  doi:10.3969/j.issn.1000-1093.2008.06.022

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In order to establish the coupled equations in metal storm with higher pills puzzle veloci?ty and higher shooting speed for antimissile, the coupled phenomena of after-effect period in metal storm were analyzed, fhe differences between metal storm’s and artillery’s after-effect periods were researched. Using adiabatic equation and gas dynamic equation, the coupled precession of after-effect period was depicted. The coupled equations of after-effect duration in metal storm were established. By computing typical metal storm example, the result was received. It is proved that higher shooting speed could create much more coupled action. By decreasing shooting speed, the coupled action could be decreased to assure the consistence of gas pressure.

Processing and Simulating of Radar Echo Signal Through Wall for Detecting Life

LI Shu-wei, GAO Mei-guo, FU Xiong-jun

2008, 29(6):  756-758.  doi:10.3969/j.issn.1000-1093.2008.06.023

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Radar echo signal through wall detecting is a kind of new exploring life technology used for seeking wounded personnel on the ruin of earthquake and rescuing hostages from terrorists. The atten?uation of radar wave after penetrating wall and the wavelength selecting were summarized, radar echo signal was theoretically deduced, Bessel function was introduced into processing echo signal and the ba?sic frequencies and harmonic combinations of breathing and heart beating were simulated. The simula?tion result is consistent with the theoretical analysis.

Performance Research of Multiple Access in Optical Communication of Satellite Formation Flying Based on Mach-Zehnder Interferometer

LI Yong-jun, ZHAO Shang-hong, WU Ji-li，DAI Guo-liang, LI Xiao-Iiang

2008, 29(6):  759-763.  doi:10.3969/j.issn.1000-1093.2008.06.024

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With the development of satellite formation flying in space and maturing of optical space communication, laser communication of satellite formation flying becomes the focus in the field of in?ternational aeronautics and astronautics, especially in that of military, because of its advantages of mo?bility, flexibility, nigh capacity, anti-interference and lower cost. The multiple access communicating model from satellites to the control center was proposed, which makes use of delay difference between two arms of Mach-Aehnder interferometer to encode and decode at the end of transmitter and receiver respectively. Math model of optics field interference was built, by which the received optical signal and interference noise in weak atmosphere turbulence were analyzed based on independent optic fields, the formulations of signal noise ratio (SNR) and bit error rate (BER) were deduced. The model was vali- aated and its performance was analyzed by numerical simulation. The simulation results show that the proposed model has the engineering application value on condition of a few satellites in Satellite Forma?tion Flying.

Study on calculating Interdiction Probability and Entry Angle Error of Missile to Runway

WEI Chang-zhu, GUO Ji-feng, CUI Nai-gang,PU Jia-Iun

2008, 29(6):  764-768.  doi:10.3969/j.issn.1000-1093.2008.06.025

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The interdiction effectiveness problem was described with probability integral method for the runway cut-blanked modes of intelligence, when entry angle error and open cabin position error exist. On the condition of open cabin position error determined, the allowable range of entry angle error was inversely calculated with interdiction probability. The calculated results indicate that the method men?tioned can manifest the intelligence missile interdiction efficiency to the runway and the range of entry angle error, which provides available basis for analyzing the intelligence missile attack assignment on tne way.