Table of Content

30 April 2005, Volume 26 Issue 2

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Paper

Application of Fuzzy Control Based on Neural Networks in the Electrical Drive Control system of Armored Vehicle

LI Hua, MA Xiao-jun, ZANG Ke-mao,ZHANG Jian,ZHANG Yun-an

2005, 26(2):  145-149.  doi:10.3969/j.issn.1000-1093.2005.02.001

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Aimed at characteristics that the armored vehicle electrical drive system is a multivariable and nonlinear system with the control system of diverse disturbance and the motor of rigorous control demand, and based on principles that fuzzy controller is not sensitive to the change of parameters and can get better control effects for nonlinear system and neural networks of learning，associative memory and distributing parallel processing function can better realize rule representation, knowledge acquisition, and parallel infer?ence, so a neural network is used to realize the fuzzy control in a BLDCM (brushless direct current motor) speed regulator. Simulation analyses using MATLAB show that the neural network fuzzy control system is less sensitive to the change of parameters than that in PID control system and the overshooting and oscilla?tion are also weakened during the resuming period when the loads are suddenly increased or decreased. This method is feasible for the electrical drive control system of armored vehicles.

A New Method of Dynamics Optimisation Design for Small-arms System Design

HU Zhi-gang, XU Cheng, GUO Kai

2005, 26(2):  150-154.  doi:10.3969/j.issn.1000-1093.2005.02.002

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Aim at the design complexity of the small arms product and the feature of multidisciplinary design optimization，this paper presented a large scale optimization model of small arms system base on MDO tech?nology. MDOjS means was introduced and application frame in the design process of small arms was given. Finally, the paper gave out a typical example which is two-levels optimization model for four subsystem of large caliber machine guns. It is proved by the example that the MDO method is feasible in the design of small arms.

Study on Range Correction of Attitude Stabilized Rocket

ZHANG Cheng, YANG Shu-xing

2005, 26(2):  155-158.  doi:10.3969/j.issn.1000-1093.2005.02.003

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Although attitude stabilization technology reduces the lateral dispersion of long-range rockets ef?fectively, their range dispersion is still not satisfactory. A range correction for the attitude stabilized rocket is necessary. A key point of the range correction is accurate range prediction. In this paper, some prediction methods were proposed and Monte Carlo method was adopted to analyze their efficiency.

A Model on the Normal Long Tubular Penetration into a Semi-infinite Target

HAN Yong-yao, ZHAO Guozhi, LI Xiang-dong, Yang Yu-lin,Fang Qing

2005, 26(2):  159-162.  doi:10.3969/j.issn.1000-1093.2005.02.004

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Long tube is an important part in a telescopic penetrator and long tubular penetration has its obvi?ous particular phenomenon. On the basis of experiments, the patterns of penetration of a long tube against a normal homogeneous semi-infinite target were described. On some hypotheses, a model of long tubular penetration into a semi-infinite target, contrasted to that of a long rod, was established and calculated. Theoretical and experimental results are found to be in good accordance. Effects of the uresidual core in the target on long tubular penetration are important. The depth of long tubular penetration has a linear rela?tionship with the velocity at I 300 ?I 800 m/s. The performance of the long tube is proved to be worse than that of the long rod with the same mass, length and density. The rule of depth varied by the ratio of inner to outer radii was also analyzed. The penetration depth increases with tne increase of velocity at the same ratu of inner to outer radi1. It decreases with the increase of ratio of inner to outer radii at the same velocity and de-creases sharply at some point. This study can be of some assistance in the design of extended projectile.

Study on Models of Torpedo Synthetic Conceptual Design with MDO

BU Guang-zhi, ZHANG Yu-wen

2005, 26(2):  163-168.  doi:10.3969/j.issn.1000-1093.2005.02.005

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Multidisciplinary design optimization (MDO) is a new solution to design large complex systems. This paper gave parameter representations in MDO and analyzed the disciplines and variables involved in torpedo design, represented models with three MDO methods, that is, multidisciplinary feasible method (MDF), individual discipline feasible method (IDF) and collaborative optimization (CO). At the end, these three models were analyzed with their own properties.

A Twodimensional Model and Calculation for the Process of Laser Ignition

WENG Chun-sheng, WANG Zhen, FENG De-cheng

2005, 26(2):  169-172.  doi:10.3969/j.issn.1000-1093.2005.02.006

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A transient，two-dimensional heat conduction model about laser ignition based on thermal mecha?nism was developed in this paper. Influences of the laser energy distribution, reactant concentration, heat convection and radiation factors are considered m the model. Its partial derivative equation is solved by al?ternating direction implicit algorithm. Influences of some factors, such as laser pulse width, beam radius, thermal conduction and depth absorption coefficient, on the ignition of Mg/NaN〇3 were analysed. Results show that the incidence power, the laser pulse width and the beam radius are main factors effective for igni?tion characteristics of energetic material. In shorter ignition time, the variance in thermal conduction coeffi?cient has less influence on the ignition process and the varienc of the absoption coefficiet has more influence on it.

Research and Recent Advance of High Resolution Infrared Image Reconstruction Technology

ZHANG Nan, JIN Wei-qi, SU Bing-hua, LIU Yang-yang

2005, 26(2):  173-176.  doi:10.3969/j.issn.1000-1093.2005.02.007

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The finite detector arrays and finite individual detector sizes oi infrared imaging systems con?tribute to the nonideal sampling of the scene information. Aliasing will occur. This aliasing can significantly degrade the image quality, causing low resolution of acquired images. Two resolution improved techniques introduced here, are referred to as microscanning and uncontrolled-microscanning. On the basis of our study on image super-resolution, one new reconstruction technique using combination of microscanning and super- resolution algorithms was presented. The technique using MPMAP algorithm is demonstrated by experi?mental results and can significantly improve infrared system’s resolution.

A Random Threshold Method to Extract Edge of Thermal Image

ZHOU Pei-de, FU Meng-yin, ZHANG Chang-jiang

2005, 26(2):  177-180.  doi:10.3969/j.issn.1000-1093.2005.02.008

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A random approach to extract the contour and inner and outer information of thermal image is given* Thresholds are searched in each column of image, which consists of quasi-threshold set. Some threshold is selected randomly from the quasi-threshold set. The final result is evaluated by a criterion. The random algorithm can detect the contour ana inner and outer information of thermal image. Computation complexity of the random algorithm is analyzed. Experimental results show tnat the new algorithm can ex- tract the edge oi thermal image efficiently and meet the practical demand of automatic target recognition.

Array Technology of Fiber Coupled High Power Laser Diodes

ZHU Lin-quan, ZHU Jiang-miao

2005, 26(2):  181-184.  doi:10.3969/j.issn.1000-1093.2005.02.009

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A technology of high power diodes coupled with fibers whose output ends are closely arranged as a linear array was reseached m this paper. The principle of the laser diode elliptic beam alignmented with mi?cro-cylinder lenses, designs of fiber coupler and clamping apparatus arranging the fiber output ends were de?scribed also. The coupling efficiency of the micro-cylinder lenses is higher. The laser diodes in the array may be addressed by computer and output power of each laser diode can be controlled. As an energy element, the array may be used in the area of laser display and selective laser sintering rapid prototyping.

Research on SNR and Image Detecting Property of Low Light Level Imaging System

ZUO Fang, GAO Zhi-yun

2005, 26(2):  185-187.  doi:10.3969/j.issn.1000-1093.2005.02.010

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In this paper, the noise sources of the EBCCD imaging system have been analyzed and a SNR model has been established. It shows that the SNR of output image is related not only to the input illumi?nance on the cathode but also to the spatial frequency of the input image. This has been proved by a series of experiment. Unperfectness of the detecting equation (Rose Equation) has been pointed out in this paper.

Identification of Blurs for Aero-optics Effect

ZHAO Yan，ZONG Yun-hua, ZHANG Shi-jun, YANG Qiu-ying

2005, 26(2):  188-191.  doi:10.3969/j.issn.1000-1093.2005.02.011

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The mathematical models of the progress of aero-optics effect were setup based on the theory of the blurred image of aero-optics effect. An error-parameter analysis approach is used to identify the point spread function and to recover the blurred image. SNR (signal noise ratio) was improved and an obvious re?sult was achieved. The research shows that a problem of image restoration of aero-optics effect can be re?solved effectively by identifying blurs.

A Modeling Algorithm for Detection of Moving On-water Magnetic Objects

LIN Chun-sheng, XIANG Qian, GONG Shen-guang

2005, 26(2):  192-195.  doi:10.3969/j.issn.1000-1093.2005.02.012

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Using the detected signals of a three-axles magnetometer, a real-time EMRES (equable magneti?zation rotation elliptic-sphere) model can be established. A statistic test algorithm is developed to judge the signals to be from a moving on water magnetic object or not. The magnetic state of the object is also esti-mated. Experiments show that this technology can detect moving object reliably with low-false alarm proba?bility even if the SNR is lower than zero (dB) and the frequency band of signal and background noise is heavily overlapped, and it also possesses target recognizing ability.

Study on New Rapid Step-changed Coherent Acquistion Algorithm for PN Sequence Using an Auxiliary Sequence

YANG Xin-yuan，HAO Jing-tao, LIU Yi, MA Hui-zhu

2005, 26(2):  196-200.  doi:10.3969/j.issn.1000-1093.2005.02.013

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Synchronization of pseudonoise code is crucial technique to spread spectrum receiving systems. In this paper, we used a novel idea to use an auxiliary signal, as opposed to the PN signal itself, for correlation with the incoming signal. And we designed a new closed-loop coherent step-changed acquisition scheme. Lx>mpared with that without step-changed scheme offered in[l], this new scheme can obviously shorten the acquisition time, especially in long code conditions, and mean acquisition time also. Mean while because a longer correlating time can be used, its anti-noise ability is improved also.

The Study on CCD Online System for Monitoring a Grinding Wheel in Process of Point Grinding on Curve Surface

ZHANG Yong-hong, HU De-jin, SONG Wei

2005, 26(2):  201-204.  doi:10.3969/j.issn.1000-1093.2005.02.014

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The working process of point grinding on curve surface was presented. CuD online monitoring system was developed, the images of grinding area can be gathered in real time by using CCD camera. A lo?cation algorithm of subpixel edge is studied. The outline edge of grinding wheel can be extracted with the algorithm, and the detected result is compared with the perfect outline. We can see from the experimental result that the method of by using monitoring grinding by using is valid. Detection precision and results are reasonable.

An Virtual Instrument for Testing Sensitivity of Radar Receiver

HE Zhi-qiang, XUE Shi-jian, ZENG Wen-xian

2005, 26(2):  205-208.  doi:10.3969/j.issn.1000-1093.2005.02.015

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This paper discusses the chief techniques and design principle of an virtual instrument used for testing sensitivity of radar receiver. The instrument consists of main control circuit, microwave circuit，sig- nal driver circuit, inner and extra modulator circuit, power filter circuit and interface control circuit inte?grated in CPLD. It embraces multi-waveband microwave source and exactitude attenuator, Controlled by PC, the instrument is used to test the sensitivity of radar receiver. In order to solve the question of frequen?cy scaling of microwave signal generators，a mathematical model of microwave signal frequency scaling is es?tablished and a corresponding algorithm is completed by analyzing many groups of experiment data and us?ing least squares method.

Ballistic Model and Simulation of a Portable Antitank Missile Steering to Hit on Top of the Tank at Terminal Trajectory

SONG Zhen-duo, DIAO Qing, XU Wen-xu

2005, 26(2):  209-214.  doi:10.3969/j.issn.1000-1093.2005.02.016

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According to the general program of a portable antitank missile steering to hit on top of the tank at terminal trajectory, this paper presented the closed-loop control stiffness ballistic model and simulation for the straight flight, the glancing flight and terminal steering trajectory under both the fixed and active targets. Simulation results show that the program is practicable.

Filter Design for Strapdown Homing Guidance System

LI Quan-yun, SONG Jian-mei

2005, 26(2):  215-219.  doi:10.3969/j.issn.1000-1093.2005.02.017

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A strapdown homing guidance system for some ammunition was described. A strong tracking Kalman filter was designed for the strapdown homing guidance system using the information measured by the strapdown seeker to estimate relative movement variables between the ammunition and target. Then an optimal proportional law, which uses the estimated information, is used to guide tlie ammunition. Simula?tion results show that the strapdown homing guidance system with strong tracking Kalman filter could at?tack the maneuvering target effectively, and satisfy the performance indexes for the guided ammunition sys?tem.

Reliability-growth Analysis Model for Liquid Rocket Engine

WANG Hua-wei, ZHOU Jing-Iun，ZHANG Jin-huai, HE Zu-yu

2005, 26(2):  220-223.  doi:10.3969/j.issn.1000-1093.2005.02.018

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Liquid rocket engine demands high reliability and high test expenditures. It is necessary to use re?liability growth analysis technology to guide decisions for saving test expenditures, shortening the develop?ment cycle and reducing risks. Exponential growth model based on converted information was brought for?ward. The model can utilize the whole test information and evaluate its reliability dynamically based on small samples and reliability growth characteristic of liquid rocket engine. Modified tracking, growth and predicting model was used for tracking the reliability growth process and decision. The study shows that the method can analyse the reliability growth and guide decision for liquid rocket engines. The method has a broad application foreground in small sample and nigh test expenditure products.

Study on the Mechanical and Anti-penetration Characteristics of Steel-wire-net Reinforced Anli-penetration Structure

ZHANG Hong-mei, WANG Yaohua, BI Ya-jun,LU Ming

2005, 26(2):  224-227.  doi:10.3969/j.issn.1000-1093.2005.02.019

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Existing engineering materials of civil defense are challenged with the appearance of new penetrat?ing projectiles. In tnis paper, current situation in the research of anti-penetration materials was reviewed. A new kind of steel-wire-net reinforced anti-penetration structure was put forward. The bending, compres?sive, impulse and shooting characteristics of several samples were tested. The tests show that the steel-wire- net can to a large extent improve the static and dynamic characteristics and the anti-penetration performance of the basic material，and the steel-wire-net reinforced cement-mortar is better than all other existing mate?rials.

Form Invariance of the Nielsen Equation of Variable Mass Mechanical System

ZHANG Jun, FANG Jian-hui, CHEN Pei-sheng

2005, 26(2):  228-230.  doi:10.3969/j.issn.1000-1093.2005.02.020

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Study of the symmetry and conserved quantity has its very important significance in mathematics, mechanics and physics. Modem theories of the symmetry and conserved quantity of a mechanical system can cniefly be listed as belonging to the Noether symmetry theory and Lie symmetry theory. Form invari?ance is a new theory of symmetry that differs from the Noether symmetry and the Lie symmetry. In this paper, the form invariance of JNielsen equation for variable mass conservative mechanical system was stud?ied. Ihe definition and criterion of form invariance of Nielsen equation for variable mass conservative me?chanical systems were given. The relation between the form invariance and the Noether symmetry was studied. An example was given to illustrate the application of the result.

A Network Management System Applying to Integrated Satellite Information Network

WEN Ying-you, ZHAO Jian-Ii, WANG Guang-xing

2005, 26(2):  231-235.  doi:10.3969/j.issn.1000-1093.2005.02.021

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Integrated Satellite Information Network is the way to realize fusion of satellite communication and traditional network technology. Satellite in space is intelligent node with computing resource. Due to its mobility, high-delay and limit of network resources, traditional network management is no longer adapt?able. To solve this problem, a new network management architecture was proposed, and the new object- oriented network management protocol was designed. On this base, a network management system was de?signed, resource and tasK management were considered besides traditional functions，which reduce the in?fluence of high-delay and limit of resources on the network management, improve its validity and accuracy.

Call Admission Control Based on Fuzzy Neural Network for Tactical Internet

WANLT Xiao-kai, HOU Uiaozhen

2005, 26(2):  236-240.  doi:10.3969/j.issn.1000-1093.2005.02.022

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Call admission control is a prevention tactics for the network traffic control. According to the par?ticularity of the tactical internet, a model ana its algorithm of call admission control based on fuzzy neural network were put forward m the paper. Using cell loss rate and delay time to describe the quality of service accord with the need of military communication networks in the model. It incarnates the basic thought of the measurement based admission control, and can make the fuzzy neural network reflect the current states of the network in time, ana ensures the accuracy of results of the call admission control algorithm. At last, the results of the simulation experiment show the effectiveness and the advantages of the method.

Application of a Quantitative Quality Evaluation System on Workpieces

LIU Jia

2005, 26(2):  241-244.  doi:10.3969/j.issn.1000-1093.2005.02.023

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The article mainly discussed the basic principle of processing in quality evaluation, the evaluation method, as well as the detailed operations, presented the framework of the software system, and explained the system’s application through practical examples. The quantitative evaluation system of workpiece quali?ty determines the dimensions ’ grade of the workpiece first，then derives the grade of the surface after weighted evaluation of the dimensions5 grade, finally gives the grade of the workpiece9 s quality after weighted evaluation of the surfaces* grade.

Study and Simulation of Algorithm for Acoustic Passive Location witn JTwo Arrays

CAI Zong-yi, ZHAO Jun-wei, XU Xue-zhong, CHEN Hua-wei, DONG Min-rong, LI Jia-wu

2005, 26(2):  245-250.  doi:10.3969/j.issn.1000-1093.2005.02.024

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Passive location exhibits as an important aspect in the acoustical surveillance technology. In order to locate the low altitude targets flying over a region, the multiple microphone arrays are always distributed over the region. When two microphone arrays are used to measure acoustic signals from the flying target, this paper provided the means for accurate localization of the target by fusion of the estimation result of two individual arrays. The processing scheme involves pitch, azimuth and range estimation by the time-delay es?timation between pairs of microphones at individual array and the estimation result from the two arrays pro?cessing jointly by a fusion center, and this processing scheme lowers the communication bandwith. Contri?butions of the paper include the development of the algorithm for fiymg target location with two microphone arrays under three different measurement conditions and the presentation of its performance analysis. When the errors of time-delay estimation of two arrays are equal，performance analysis and simulation show that the precision of location using pitch and azimuth obtained from two individual arrays is superior to others, and the microphone array’s shape also contributes to the precision. This result can be directly used in locat?ing low altitude targets such as helicopters, or missiles.

Cyclostationarity-based Symbol Rate Estimation

TANG Su-hua, DAI Xu-chu，XU Pei-xia, FANG Xiao-qing

2005, 26(2):  251-255.  doi:10.3969/j.issn.1000-1093.2005.02.025

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cyclic autocorrelation of common digital modulations was investigated, and the relationship be?tween cyclic autocorrelation and delay as well as symbol rate was deduced, then a new estimation algorithm for symbol rates was presented in this paper. Theoretical analyses and simulations show that this new esti?mation method is characterized by lower computational complexity, less estimation error and independence of noise. The proposed algorithm is of practical value in modulation recognition and blind demodulation.

Finite Element Analysis and Test Research on Thermal Dynamic Characteristics of Road Wheel Flange Model

WEI Min, ZHANG Ying, ZHENG Mu-qiao

2005, 26(2):  256-259.  doi:10.3969/j.issn.1000-1093.2005.02.026

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The finite element structural models of rubber and cast polyurethane road wheel are established by the software ANSYS. After calculating heat generation ratio of the nodes, the results can be used as the thermal loads on the finite element models of temperature field established. Based on the results of finite el?ement analysis and test research, thermal characteristics of rubber and cast polyurethane can be contrasted, and some formulas are used to demonstrate thermal dynamic characteristics.

Short Papers

A Method Lsing Angle Information to Improve Flight-path Estimating Precision

QI Guo-qing, SHENG An-dong, LIU Yan, GUO Zhi

2005, 26(2):  260-262.  doi:10.3969/j.issn.1000-1093.2005.02.027

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Laser range finders with high repetition rate more than 5 Hz are often used for flight path mea?surement. But, they can not meet the demands for a portable target detector because of the restrictions, such as heat dispelling, power supply, volume and cost. As the target’s angle information can be obtained by a ripe photoelectric tracking system with sampling period of 20 ms. Using this high repetition angle in?formation, a new flight-path parameter estimating method based on a laser range finder with lower repeti?tion rate of 3.125 Hz is proposed in this paper. Digital simulation results for it have shown its precision and feasibility.

A Study on the Uncertain Robust Control of Robot Based on Dynamic Observer

LI Shi-jing, WAN Jie-fa, FENG Zu-ren, XIAO Yun-shi

2005, 26(2):  263-266.  doi:10.3969/j.issn.1000-1093.2005.02.028

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parameter inaccuracies ana bounded disturbances, a robust control scheme based on velocity observations was proposed for robot systems in which only the positions can be precisely measured. By the introduction of a compensation term in the design of the sliding mode observer that counteracts the effect of system deviations to the velocity reconstruction, the exponential observation error is converged to a bounded region. Using the Lyapunov direct method in designing the robust control laws based on the normal model and observed velocity, the closed-loop system satisfies the local uniform ultimate boundedness. The effec?tiveness of the proposed scheme is verified through simulation studies on a 2D of planar robot.

Application of Adaptive Wavelet Based on Littmg Scheme in Simulation Data Filter of Guided Bomb

ZHANG Bang-chu, HAN Zi-peng, SHU Jing-rong，FAN Yan-fei

2005, 26(2):  267-270.  doi:10.3969/j.issn.1000-1093.2005.02.029

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For problems of sample data processing in IMU of guided bombs，a novel method using adptive wavelet based on lifting scheme was proposed in this paper. When noises of data are unknown, wavelet de?composition coefficients in high frequency are used to estimate the amplitude of noises, and polynomial fit?ting predictors are adopted in the time-varying system. The flight simulation results on a three-axis turntable show that the method is efficient，and especially fit to time-varying processes when the data needs to be predicted.

A Study on Load Balance in Military Networks

SHANG Fei，WEI Jun

2005, 26(2):  271-273.  doi:10.3969/j.issn.1000-1093.2005.02.030

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In modern battles，a communication network is always composed of lots of nodes，such as individ?ual equipment and vehicles. In order to improve its performance, including its quick response, high avail-ability and reliability etc, communication traffic control and load balance must be considered. In this paper, a solution is explored in a TCP/IP testing network. The result illustrates that the concept and methods could be used as a reference in military command network systems, regardless of real protocols.

Experimental Techniques and Analysis

Effect of Components of Fuel-rich Boron-based Solid Propellant on the Burning Rate in Low Pressure

WANG- Ying-hong, LI Jin-xian, LI JBao-xuan, XIAO Xiu-you, LIU Hong-cheng

2005, 26(2):  274-277.  doi:10.3969/j.issn.1000-1093.2005.02.031

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Effects of components of fuel-rich boron-based solid propellant on burning rate in low pressure and explo?sive heat were investigated by measuring its burning rate with standard burner method and explosive heat with calo?rie meter of oxygen bomb. The results show that enhancing the concentrations of AP, adding burning catalyzer and increasing the concentration of superfine AP will increase the burning rate, and increasing the boron content increas?es the explosive heat and decreases the burning rate. Thermal analysis results show that the Duming rate increasing in low pressure can be attributed to the condensed-phase reaction.

Realization of a Laser Range Finding Device Based on Thin Film Fully-depleted SOI CMOS Integrated Technology

Zhang Xin, Gao Yong, Liu Shan-xi, An Tiao，Xu Chun-ye

2005, 26(2):  278-281.  doi:10.3969/j.issn.1000-1093.2005.02.032

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The development of a high-speed and low-power dissipation SOI CMOS fully-depleted integrated circuit with thin silicon film was presented. A fully-depleted SOI structure with thin silicon film, and the techniques, including high-quality oxidation of the gate, LDD structure, sputtered Ti film silicide，etc, were used to implement SOI CMOS laser range finding device with high-speed and low-power dissipation, which is based on the simulation and testing for the device structure. The test results show the propagation delay per-stage of 101-stage ring oscillators for 1. 2μm device is 252 ps with 3.3 V supply voltage, total propagation delay is 54. 2 ns. Its static state power dissipation is 3 mW, dynamic power dissipation is 15 mW.

Research Notes

Microencapsulation of chlorocyclophosphazene by interfacial polymerization

LIU Ya-qing, ZHAO Gui-zhe

2005, 26(2):  282-284.  doi:10.3969/j.issn.1000-1093.2005.02.033

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A polyurea-chlorocyclophosphazene microcapsule flame retardant was prepared by interfacial poly?merization process witn 2,4 — toluene aiisocyanate(TDI) and hexanediamine as the raw materials. TG tests show that the thermal decomposition temperature of chlorocyclophosphazene in microcapsule obviously ris?es. The flame retardancy of HDPE/chlorocyclophosphazene in microencapsules is improved to than HDPE/ chlorocyclophosphazene. Mechanical properties of HDPE/chlorocyclophosphazene microencapsule turns out to be superior to HDPE / chlorocyclophosphazene.

Experiment Investigation on High Efficiency EDM and Optimization of Processing Parameter

LrUO Chang-ning, PEI Jin-yu, MA Chun-xiang

2005, 26(2):  285-288.  doi:10.3969/j.issn.1000-1093.2005.02.034

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A new excluding method of debris using the rapid flow due to evaporation of dielectric fluid wnen discharging was proposed and the EDM characteristics of the method were experimentally discussed. The result shows that the Higher efficiency EDM is attained by this method and the debris is smoothly removed with the conditions of large discharge current, narrow gap and the short pulse interval time.