Table of Content

28 February 2006, Volume 27 Issue 1

Previous Issue    Next Issue

Paper

Statistic Modeling of Static Magnetic Field for Armored Vehicle

NIU Yun-feng, WANG Xue-tian, WANG Zhi-guo

2006, 27(1):  1-4.  doi:10.3969/j.issn.1000-1093.2006.01.001

Asbtract ( )   PDF (3737KB) ( )  

References | Related Articles | Metrics

To research the target characteristics of the armored vehicle, the test data of the magnetic field for an armored vehicle are analyzed, and the statistic model of the magnetic field around the ar?mored vehicle is constituted. The results show that the statistic modeling can reduce the measured data of the magnetic field and guarantee higher accuracy.

Analysis of Bearing Design for HPD Diesel Engine

LIU Jian，ZHANG Wei-zheng

2006, 27(1):  5-9.  doi:10.3969/j.issn.1000-1093.2006.01.002

Asbtract ( )   PDF (5107KB) ( )  

References | Related Articles | Metrics

High Power Density (HPD) diesel engines are developed for military use, which Pl should be up to 100 kW/L. I he special design needs higher reliability of the engine. In this paper, the per?formance of HPD engine was simulated, and the bearing load was calculated by using the simulation result. Through analyzing the influences of high specific pressure, high rotating speed and high tem?perature on lubrication performance of con-rod big end bearing, the key problem needed to be solved in this bearing design was proposed.

Dynamic Damage and Failure Model for Concrete Materials

JIN Qian-kun

2006, 27(1):  10-14.  doi:10.3969/j.issn.1000-1093.2006.01.003

Asbtract ( )   PDF (4535KB) ( )  

References | Related Articles | Metrics

A new dynamic damage and failure model for modeling penetration into concrete or rein?forced concrete materials is presented based on TCK damage model. The model includes two parts ： tensile damage described by TCK model and shear failure by RHT model. Nonlinear strain hardening, pressure and J3 dependent iauure surface, strain softening, tensile and compressive damage and strain rate effects are accounted in the model. I he model is implemented through a user defined material model in LS-DYNA. The model parameters are calibrated and validated by the data from related con?crete penetration tests. The calculated result shows that the model can predict craters, perforation and post perforation scabbing from the inner face of tunnel and back face of target during penetration into concrete or reinforced concrete materials. The calculated residual velocity of the penetrator agrees well with the test data.

An Empirical Equation for Penetration Depth of Projectiles into High-strength Rock Targets

ZHANG De-zhi, LIN Jun-de, TANG Run-di，ZHANG Xiang-rong

2006, 27(1):  15-18.  doi:10.3969/j.issn.1000-1093.2006.01.004

Asbtract ( )   PDF (3679KB) ( )  

References | Related Articles | Metrics

Empirical penetration equations are mostly based on experiments with soil and concrete tar?gets. These penetration equations must be experimentally validated for rock targets especially high- strength rock targets. In this paper, the typical empirical penetration equations for rock targets are in?troduced. A series of normal penetration experiments on granite targets were made. The depth of pen?etration is compared with these empirical equations. On these bases, a new empirical equation for depth of projectile penetrating into high-strength target was established. The result derived from the new empirical equation is identical with experimental result.

Coverage Method for Determining Radius of Equivalent Circle of Submunition Dispersion

HUANG Chun-guang，CHEN Zhen-you, YANG Shu-xing

2006, 27(1):  19-22.  doi:10.3969/j.issn.1000-1093.2006.01.005

Asbtract ( )   PDF (3589KB) ( )  

References | Related Articles | Metrics

The article, based on the subject of dispenser bomblets fired by gun and processing of exper?imental data, analyzes several popular methods for determining radius of equivalent circle of submuni?tion dispersion and introduces a coverage method. The method can be applied to the determination of acceptance standards of products and be used for reference in the course of revision of the National Mil?itary Standard ：《Approval Test Regulations of Dispenser Bomblets by Gun》 (GJB 4024-2000).

Numerical Simulation and Effect Analysis for Radial Dispersion of MEFP

ZHOU Xiang, LONG Yuan, YU Dao-qiang, YUE Xiao-bing, ZHANG Cheng, XIEWen

2006, 27(1):  23-26.  doi:10.3969/j.issn.1000-1093.2006.01.006

Asbtract ( )   PDF (4049KB) ( )  

References | Related Articles | Metrics

A Kind of charge structure for multiple explosive forming projectile (MEFP) was designed to improve the destruction effect to the armored targets. The MEFP formation process and influence fac?tors were simulated using LS-DYNA 3D. Simulation results show that the radial dispersion of MEFP depends on the density of inert stuff, the space between neighboring charges and time difference in the synchronization. Generally, the smaller density of inert stuff, the greater EFP space and the smaller time difference benefit to reduce the radial dispersion of MEFP.

The Algorithm of Time-to-go Using Angle Information Provided by Seeker During Missile-target Encounter

LIU Jian-feng, ZHUANG Zhi-hong

2006, 27(1):  27-31.  doi:10.3969/j.issn.1000-1093.2006.01.007

Asbtract ( )   PDF (4326KB) ( )  

References | Related Articles | Metrics

The missile performance of anti-tactical ballistic missile (ATBM) depends on missile fuze and warhead to a great extent. In order to improve the kill probability, a simple but effective time de?lay algorithm is very important. The paper does some researches on two time-to-go algorithms, which are deduced using angle information provided by the seeker fuze and are analyzed through simulation. The simulation results show that the algorithm I is too sensitive to the noise of angle and the estima?tion error is too big. Algorithm 2 has better performance than algorithm I. GHK filter can make the steady estimation error very small. It can satisfy the request of accurate burst time control.

LFM Interference Excision Technique in Pseudo-random Code Fuse Based on Fractional Fourier Transform

ZHANG Shu-ning, ZHAO Hui-chang, WU Bing

2006, 27(1):  32-36.  doi:10.3969/j.issn.1000-1093.2006.01.008

Asbtract ( )   PDF (4842KB) ( )  

References | Related Articles | Metrics

The influence of LFM interference on correlation detection performances of the pseudo-ran?dom code fuse was analyzed. It is found that the correlation output is deteriorated when the LFM in?terference power exceeds the anti-jamming limitation of the fuse itself. Thus, the LFM interference must be excised before correlation. By analyzing the fractional Fourier transform (FRFT) result of LFM signal, a method of excising LFM interference in fractal domain was put forward. To avoid the disadvantage of useful signal loss with the fixed threshold when strong interference exists, a method of adaptive threshold was proposed. Simulation results show that it can excise the LFM interference ef?fectively, ameliorate the correlation output and improve signal to jamming ratio.

A Simple Interpolation Technique for the DFT for Joint System Parameters Estimation in Burst MPSK Transmissions

WANG Ning, AN Jian-ping, WANG Jun

2006, 27(1):  37-40.  doi:10.3969/j.issn.1000-1093.2006.01.009

Asbtract ( )   PDF (3921KB) ( )  

References | Related Articles | Metrics

In burst-mode digital transmission, carrier synchronization is a key technique in the coher?ent- demodulation of multiphase-shift key (MPSK) signals and is directly related to the specification to demodulation. The algorithm of estimating carrier frequency and phase was proposed by a simple fre?quency domain interpolation technique for discrete Fourier transform. The algorithm can significantly improve the frequency and phase resolution capabilities of the DFT without increasing its data size. The principle and performance of the algorithm was analyzed and the result of the simulation was giv?en.

Correlation Based Direction Finding Algorithm for Vehicular Shortwave Tri-channel System

WANG Lei, DAI Xu chu

2006, 27(1):  41-45.  doi:10.3969/j.issn.1000-1093.2006.01.010

Asbtract ( )   PDF (4889KB) ( )  

References | Related Articles | Metrics

A novel direction finding algorithm based on Watson-Watt crossed-loop antennas was pre?sented .This method can be applied to non-coordinate RF source and uses a tri-channel model. Firstly, using correlation functions among the received signals from three channels, an estimator oi the azimuth was attained. Then, the correlation functions were processed, and the problems about modulation compatibility, precision of direction finding in low SNR and phase mismatch among three channels could be solved. Simulation results indicate the correctness and effectiveness of this method.

A New Method for Realizing Radar Echo Waveform Analyzer

HOU Jian-gang, TAO Ran, ZHANG Wei-qiang

2006, 27(1):  46-49.  doi:10.3969/j.issn.1000-1093.2006.01.011

Asbtract ( )   PDF (3316KB) ( )  

References | Related Articles | Metrics

From the viewpoint of correlation, the radar echo waveform analyzer was studied. The tra?ditional maximum method and the geometrical center method were derived, and a novel centroid method was presented. The computational algorithm of the centroid method was given. The precision of the proposed method was compared with those of the traditional methods. The theory and simula?tion show that the centroid method has the advantages of higher precision and easier implementation.

Missile Autopilot Design Based on Dynamic Second Order sliding Mode Control

SHANG An-li, YU De-hai, GU Wen-jin

2006, 27(1):  50-53.  doi:10.3969/j.issn.1000-1093.2006.01.012

Asbtract ( )   PDF (3599KB) ( )  

References | Related Articles | Metrics

A non-minimum phase nonlinear missile model is used to design a stable controller. Its non?minimum phase characteristic restricts direct applications of some powerful nonlinear control tech?niques, such as feedback linearization control and sliding mode control (SMC). For convenience in the design, the linear part of the system model was transformed to the normalized form first. The output- tracking problem would be replaced by the state tracking problem, hence, the sliding mode control could be used for the autopilot design. Valid dynamic sliding mode output that guarantees the system stable zero dynamics was constructed, and a global second order sliding mode control was adopted to circumvent chattering phenomena. The simulation results show the validity of the proposed method in command tracking and chattering attenuation.

The Principle and Dynamics Analysis of a Four-shaft-linked Actuator

WANG Jun-quan, WANG Xiao-ming, LI Wen-bin

2006, 27(1):  54-57.  doi:10.3969/j.issn.1000-1093.2006.01.013

Asbtract ( )   PDF (3751KB) ( )  

References | Related Articles | Metrics

A new structure of electromechanical actuator was proposed according to the control princi?ple that the trajectory correction of rolling projectile requires. The kinetic model was made, and the practicability of the structure was analyzed through an example. The analyzed result indicates that the load is very little, the structure is simple and the action is reliable. It can drive four rudder faces by on?ly one electromotor and is very suitable to rolling projectile.

Reliability Growth Planning for Liquid Rocket Engine Based on Optimal Information

WANG Hua-wei

2006, 27(1):  58-62.  doi:10.3969/j.issn.1000-1093.2006.01.014

Asbtract ( )   PDF (4801KB) ( )  

References | Related Articles | Metrics

Liquid rocket engine demands high reliability, but test expenditure is costly. It is necessary to plan reliability test to decide stopping time for saving test cost, shortening development cycle and re?ducing risk. According to the characteristics of liquid rocket engine, the reliability growth planning for liquid rocket engine based on optimal information was brought forward. An exponential Bayesian relia?bility growth model for reliability growth data was used to evaluate reliability. Because of the consider?ation of the uncertainty of reliability, a Bayesian risk method was used to optimize reliability test. Ex?ample was given to show its validity and application foreground.

A calculating Method of Helicopter Rotor Downwash Flowfield Based on Free Wake Analysis

ZHAO Jing-gen, XU Guo-hua，ZHAO Qi-jun

2006, 27(1):  63-68.  doi:10.3969/j.issn.1000-1093.2006.01.015

Asbtract ( )   PDF (5845KB) ( )  

References | Related Articles | Metrics

A rotor free-wake model including fuselage effects was estaolished to predict the rotor in?duced velocity flowfield of a real helicopter which has a combined rotor and fuselage configuration, and to provide a calculating method of the downwash flowfield for airborne rocket or missile fire. In this model, a rolled-up tip vortex model was used to simulate the effects of the wake on the flowfield, a second-order lifting-line model was adopted to represent the effects of the blade on the flowfield and a source panel model was included to take into account the induced and obstructed effects of the fuselage on the rotor wake. Based, upon the free-wake model, numerical examples for a 4-blade combined rotor and fuselage configuration of University of Maryland and a 2-blade combined rotor and fuselage config?uration of the Georgia Tech were given. The computations of steady and unsteady flow velocities were carried out. The comparison between calculated result and available experimental data shows the effec?tiveness of the method.

Steering Performance simulation for Electric Drive Tracked Vehicle Based on MATLAB SIMULINK

LU Lian-jun, SUN Feng-chun, ZHAI Li

2006, 27(1):  69-74.  doi:10.3969/j.issn.1000-1093.2006.01.016

Asbtract ( )   PDF (5704KB) ( )  

References | Related Articles | Metrics

A new simplified electric drive tracked vehicle model was built. On the basis of theoretical analysis for steering of the vehicle, making use of the asynchronous motor model and its vector space control model, simulations of the steering performance of the vehicle were made in the independent and the differential steering modes. The results are as follows. The speed control can realize the straight and steering travel. To make the torque and the current smooth, a reference speed should, be given gently. Different steering modes should be taken for different steering conditions. The regenerative en?ergy is abundant during regenerative steering, and. the energy should be fully used.

Operational Readiness Model and Calculating Method for Military Auto Vehicle

XIE Bo-yuan, GAO Shu-xin, JIN Xiao-hui, LI Wen-jun

2006, 27(1):  75-78.  doi:10.3969/j.issn.1000-1093.2006.01.017

Asbtract ( )   PDF (3810KB) ( )  

References | Related Articles | Metrics

Operational readiness is one of the important indexes to evaluate the supportability of mili?tary auto vehicle. In consideration of the factors of reliability, maintainability, suDportability, and the vehicle usage and management status, an operational readiness model of military auto vehicle was es?tablished by a systematic analysis method. It is available for reference to army evaluation in respect of the operational readiness of military auto vehicle.

Study of the Virtual Maintenance Training System for Large Complex Equipment

SU Qun-xing, LIU Peng-yuan

2006, 27(1):  79-83.  doi:10.3969/j.issn.1000-1093.2006.01.018

Asbtract ( )   PDF (5321KB) ( )  

References | Related Articles | Metrics

A method of constructing certain missile virtual maintenance training system was proposed based on virtual reality technology, virtual prototype technology and process simulation technology. The system consists of virtual prototype and virtual maintenance simulation control. The second part is made up of virtual environment generation and output, human-computer interaction, maintenance mis?sion control, virtual prototype and tools action and state control. The functions of each part and mod?ule were studied. Furthermore, the description method of maintenance knowledge based on mainte?nance knowledge description net (MKDN) and the simulation control flow of immersed virtual mainte?nance training system were presented. The methods and simulation control flow offered were success?fully applied to certain missile virtual maintenance training system.

Design for Negative Shift and coincidence Degree of Reciprocating Positioning Chain

XU Jin

2006, 27(1):  84-87.  doi:10.3969/j.issn.1000-1093.2006.01.019

Asbtract ( )   PDF (3695KB) ( )  

References | Related Articles | Metrics

The structure and principle of reciprocating positioning chain are introduced, and the mesh?ing process is analyzed also. By designing the negative shift for the sprocket, its trajectory coincides with the theoretical one, and the meshing quality is improved. The coincidence degree of the meshing is analyzed, it offers a guideline for choosing the coincidence degree, and it is significant to improve the transmission smoothness.

Optimal Configuration of Sensors and Actuators for Vibration Control of Cantilever Plate

Lü Yong-gui, WEI Yan-ding, LU Cun-yang,CHEN Ding-zhong, LI Guo-ping, CHENG Yao-dong

2006, 27(1):  88-92.  doi:10.3969/j.issn.1000-1093.2006.01.020

Asbtract ( )   PDF (4480KB) ( )  

References | Related Articles | Metrics

The configuration of piezoelectric sensors and actuators for the cantilever beam is studied. Firstly, a finite element formulation for the vibration of composite beam was established. The finite el?ement analysis(FEA) is then used to analyze the configuration of piezoelectric sensors and actuators. Considering the control of each of the first five vibration modes, the FEA was combined with the ge?netic algorithm (GA), a new configuration method oi the sensors and actuators was developed.

Machining and Design of Precision Combined Tool for Valve Seat and Guide

KANG Yun-jiang, WANG Xi-bin, XIN Min

2006, 27(1):  93-96.  doi:10.3969/j.issn.1000-1093.2006.01.021

Asbtract ( )   PDF (4205KB) ( )  

References | Related Articles | Metrics

Through machining experiments, it is found that ceramal is an appropriate cutting material for valve seats made of Cr-Mo-Ni powder metallurgy, from point of view of whether the machining ac?curacy or tool-life. A new technique to macnine valve seat conical hole was proposed. Structures of in- dexical inserts and precision combined cutting tools were designed also.

The Simulation for Cooling Method of Piston in High-duty Engine

TAN Jian-song, YU Xiao-Ii

2006, 27(1):  97-100.  doi:10.3969/j.issn.1000-1093.2006.01.022

Asbtract ( )   PDF (3879KB) ( )  

References | Related Articles | Metrics

A mathematical model of heat transfer between the engine piston and its environment was established. The influences of the different cooling methods on the thermal state of piston were ana?lyzed and compared by using 3D FE method. The results show that the forced oil cooling inside piston including oil passage, injection without oil passage and high location oil passage is an effective method and the cooling effect depends on the location of the oil-way.

Short Papers

Stiffness-oriented Optimization Methodology for Geometric Design of Virtual-axis Hiexapod Machines

CHEN Ji-qing, LAN Feng-chong

2006, 27(1):  101-105.  doi:10.3969/j.issn.1000-1093.2006.01.023

Asbtract ( )   PDF (4147KB) ( )  

References | Related Articles | Metrics

Increasing the mechanism stiffness of the virtual-axis hexapod machine is an important fac?tor to improve machining and controlling precision. A geometric optimization method for the parallel machine was presented. The mechanism stiffness model was established and the instantaneous elastic characteristics were analyzed by the model during machining process in consideration of the effect of the changes in mechanism geometric and loading conditions on the total stiffness. Machining process simulations were carried out under a variety of constraint conditions. The cutter deviations from tool?ing paths were calculated, and the optimal geometric parameters for the mechanism with the maximum rigidity on the cutter end were obtained, so that positioning and machining accuracy could be im?proved .As a result, this research provides a simple and effective geometric methodology for mecha?nism design and geometric parameter determination for the virtual-axis hexapod machine.

Applying Laser Scattering Characteristic of Object to Measuring Surface Microcosmic Profile Precision of Steel Plate

LI Li-juan, AN Zhi-yong，CAO Guo-hua,DONG Qi-shun,LI Zhen-hui, CAO Wei-guo

2006, 27(1):  106-110.  doi:10.3969/j.issn.1000-1093.2006.01.024

Asbtract ( )   PDF (4339KB) ( )  

References | Related Articles | Metrics

Taking aim at measuring the precision of surface microcosmic profile of the cold-rolled steel plate, the principle and technique of measuring surface roughness parameters about the prolile arith?metic average error Ra and the peaks per inch(FFJ) were proposed. The models of profile arithmetic average error Ra and correlation length T of the cold-rolled steel plate surface were established based on the Beckmann light scattering theory and the quantitative relation between specular reflection and surface roughness was founded. Through the theoretical and test result analysis, the optimal laser inci?dence wavelengtn was found, and the measuring subsystems of Ra and PPI were designed. By using an integration technique, the Ra unit, PPI unit and other various units can be integrated. So the real?time and simultaneous non-contact measurement of multi- parameters can be realized.

Robust Control of a Structural-Acoustical Coupling System by Using the μ-synthesis Theory

HU Ru-fu, CUI Zhong-hua, LI Pu,CHEN Nan

2006, 27(1):  111-115.  doi:10.3969/j.issn.1000-1093.2006.01.025

Asbtract ( )   PDF (4242KB) ( )  

References | Related Articles | Metrics

Based on the μ-synthesis theory, a robust control model of structural-acoustical coupling system for a three-dimensional rectangular enclosure was established, and a design method of robust μ-synthesis controller was proposed. The robust performance problem of the structural-acoustical coupling system was transformed into the robust stability problem of an augment system via the introduction of a fictive uncertainty module. The robust stability controller for tnis augment system was solved by standard D- K iteration. Simulation results indicate that μ-synthesis can provide a good disturbance rejection and is more robust to parameter variations than H∞ controller. In comparison with the previous studies, this paper designs an active robust controller for the structural-acoustical coupling system by using the μ-synthesis theory, and demonstrates the merit of μ-synthesis controller.

Simulation on Motion Reliability of Crank-Slider Mechanism

JI Yu-jie, SUN Zhi-Ii, LI Liang-qiao

2006, 27(1):  116-120.  doi:10.3969/j.issn.1000-1093.2006.01.026

Asbtract ( )   PDF (4174KB) ( )  

References | Related Articles | Metrics

The theoretical analysis of mechanism motion reliability is a complicated problem to be solved. The model of typical mechanism motion reliability was established by using ADAMS as an analysis platform and designing the variable parameters of the mechanism. The solution could be com?puted with Monte Carlo method. The scheme had no need to deduce or solve the complex analytical e- quations. Take the crank-slider as an example with the consideration of geometry manufacture and joint clearance errors, which actually affect on the reliability of mechanism, the result is more accurate than that of the traditional methods. The presented scheme is more suitable for complex mechanism and can be liable to be employed m engineering application.

Comprehensive Reviews

Application of Wigner-Hough Transform in Detection of Underwater Transient Signals

LI Gang-hu, LI Ya-an, WANG Jun,CUI Hai-ying

2006, 27(1):  121-125.  doi:10.3969/j.issn.1000-1093.2006.01.027

Asbtract ( )   PDF (4320KB) ( )  

References | Related Articles | Metrics

The application of Wigner-Hough transform (WHT) in detection of underwater transient signals was demonstrated. It could be found that the output signal to noise ratio (SNR) was enhanced greatly when the time frequency distribution of undertwater acoustic transient signals contained line components. Simultaneously, WHT could reduce the cross terms of multi- component signals. Simula?tion results show that WHT can detect and identify the signals better even if the SNR is — 5 dB for multi- component signals and 一 7 dB for mono- component signals. When this method is used to analyze real lake test data in which some transient components are included, the analysis results show that WHT detection is superior to matched filter, Wigner-Ville distribution (WVD) and cross Wigner-Ville distribution (XWVD).

Experimental Techniques and Analysis

Simulation for Burst Firing Kill Probability of Antiaircraft Gun

ZENG Qian-teng, WU Hui-zhong

2006, 27(1):  126-131.  doi:10.3969/j.issn.1000-1093.2006.01.028

Asbtract ( )   PDF (5466KB) ( )  

References | Related Articles | Metrics

The calculation of antiaircraft gun burst firing kill probability is very complex and needs to be simplified in some ways. A simulation statistics model was established based on the process of antiaircraft gun burst firing. Taking 4-25 mm antiaircraft gun as an example, the burst firing kill probabilities for 6 different targets were counted by the simulation, and compared with the values cal?culated by the conventional analysis method. The result shows that some simplifications in analysis method are unreasonable and the simulation for complex stochastic system based on C + + program?ming is feasible.

Temperature Field and Thermal Stress of Brake Plate for an Express

ZHAO Wen-qing

2006, 27(1):  132-136.  doi:10.3969/j.issn.1000-1093.2006.01.029

Asbtract ( )   PDF (4690KB) ( )  

References | Related Articles | Metrics

The temperature field and thermal stress of brake plate for 270 km/h high-speed train were studied by use of MSC.Patran and MSC. Marc on the basis of experimental research to real brake plate. The computer simulation of temperature field and thermal stress of brake plate was studied when braked. A mathematical model on temperature field and thermal stress of brake plate was established on the basis of theory and experimental research. The simulation result is conformed to the experimen?tal test outcome. The simulation result reflects the distribution law of temperature field and thermal stress of real brake plate. The main factor which influences the temperature field and thermal stress of brake plate is revealed. It is proved by the experiment of brake in the test platform and the fieldwork of high-speed train that the brake plate used for high-speed train can satisfy the need of practical use.

Fuzzy Ideal Point Method for Estimation of Life Cycle Cost and Effectiveness of Torpedo Weapon System

LIANG Qing-wei, SONG Bao-wei, PAN Guang

2006, 27(1):  137-140.  doi:10.3969/j.issn.1000-1093.2006.01.030

Asbtract ( )   PDF (3059KB) ( )  

References | Related Articles | Metrics

The ideal point method in optimization theory was selected to estimate the life cycle cost and effectiveness for torpedo weapon systems. And, the concept of closeness degree of fuzzy mathematics was used to compute the distance between the life cycle cost/effectiveness and the ideal point/negative ideal point. As examples, four torpedo weapon systems were estimated. The results indicate that this method can be used practically.

Thermosenescence Test and Life Prediction of Engineering Plastics for Small Arms

FAN Qi-sheng, HUANG Xue-ying, GUO Bao-xing

2006, 27(1):  141-143.  doi:10.3969/j.issn.1000-1093.2006.01.031

Asbtract ( )   PDF (2133KB) ( )  

References | Related Articles | Metrics

In view of the performance degradation of engineering plastics for small arms within its sto?rage period, it is necessary to predict the thermosenescence life of engineering plastics to consummate the test evaluation technologies of proving ground. The useful life of engineering plastics was predicted within the storage period using a polynomial fitting curve method, and its storage life deadline was in?spected .

Research Notes

Experimental Research and Analysis for Shock Wave Distribution Law of Cannon Shooting Inside Shelter

WU Jun, GAO Chao, LIU Yuan

2006, 27(1):  144-148.  doi:10.3969/j.issn.1000-1093.2006.01.032

Asbtract ( )   PDF (4043KB) ( )  

References | Related Articles | Metrics

The shock wave distribution law on cannon shooting inside shelter was investigated through test and numerical calculation, every overpressure and yawp of different thickness earth inside shelter were obtained. The overpressure distribution curves of different hatch width on cannon shooting inside shelter were presented, the test result and numerical analysis were compared.

Test and Analysis of Attitude and Movement of Projectile in Bore

LU Wen-guang, RUI Xiao-ting, GU Jin-liang, LU Yu-qi

2006, 27(1):  149-153.  doi:10.3969/j.issn.1000-1093.2006.01.033

Asbtract ( )   PDF (4381KB) ( )  

References | Related Articles | Metrics

During launch process, projectile swings violently in bore and generates great transverse ac?celeration that may reach up to two times of the axial acceleration. Due to the shade of barrel, it is hard to detect the movement of the projectile in bore. A union test system for the attitude and axial movement of the projectile in bore was presented. The experiment was carried out successfully. The spectrum and the time-frequency were analyzed by Fourier transform and wavelet analysis. The test method and analysis tools were provided for the design and iailure analysis of fuzes.

Extracting Thermal Crack in Piston Lsing Dynamic Image Difference Method

WU Qian, SHEN Ji-sheng, LIU Zhen-tao，YU Xiao-Ii

2006, 27(1):  154-158.  doi:10.3969/j.issn.1000-1093.2006.01.034

Asbtract ( )   PDF (4657KB) ( )  

References | Related Articles | Metrics

At present, thermal crack is checked manually and the thermal damage procedure is hard to get, though an automatic test technique is employed in thermal shock test. A thermal shock bench was improved by incorporating an image measure system to get thermal crack information where the pic?tures of piston crown were taken by a CCD camera periodically during the test. An effective image dif?ferential algorithm is studied to extract thermal crack finally which can effectively resist effection of il?lumination variation. Image correlation based on dynamic image difference is a practical method in ex?tracting dynamic thermal crack at the thermal shock test bench.

Electronic Control System of Hydrostatic Driving for Cannon

JING Bao-de, YIN Yong-guang, LIU Shun-an,AN Yu-han, WANG Hai-yan, GAO Xiu-hua

2006, 27(1):  159-161.  doi:10.3969/j.issn.1000-1093.2006.01.035

Asbtract ( )   PDF (2700KB) ( )  

References | Related Articles | Metrics

A cannon hydrostatic driving system is described. The system uses an electric-hydraulic pro?portional control to implement the self-walking function of cannon. The mathematical model of the pump control motor system was set up by analyzing the closed system, and a dynamic simulation was performed at the same time.The output pressure-flow curve was obtained by testing the electronic control hydrostatic driving system, which confirmed the characteristic of constant power. As an exam?ple of hydrostatic driving system for military vehicles, the application of electronic control unit (ECU) leads to weight reduction of cannon, thus improving the manoeuvrability.

Application of Grey Target Theory in Evaluating the Effectiveness of Weapon Systems

XIE Zhi-jian, BO Yu-cheng

2006, 27(1):  162-165.  doi:10.3969/j.issn.1000-1093.2006.01.036

Asbtract ( )   PDF (3682KB) ( )  

References | Related Articles | Metrics

According to the theory of grey systems, the patterns of alternative schemes are formed with the tactical and technical performance indices which reflect the effectiveness best. Thereby, a standard pattern of these patterns is obtained by these patterns. The good or bad effectiveness of weapon sys?tems evaluated can be distinguished by solving the aoproacmng degree of patterns for their standard ones and making the queue of approaching degrees in the light of their values. It is found from the evaluation of three rifles that the method gives the same conclusion as that from conventional method and the actual situation of using the weapons in battlefield. Therefore, the method is proved to be valid.

Shooting Methods of Firearms in Actual Battles

SHAN Yong-hai, KANG Zhan-ke, SUN Guoji

2006, 27(1):  166-169.  doi:10.3969/j.issn.1000-1093.2006.01.037

Asbtract ( )   PDF (4389KB) ( )  

References | Related Articles | Metrics

In order to investigate the rationality of firearm shooting methods instituted under military standards, shooting methods of all kinds of firearms satisfying the needs of tests and practices of actual battles were proposed on the basis of actual battle analysis and research. They were analyzed from the most typical battle categories, namely attack and defence battles, and surveied and studied in troops and military academies.

Study on High-explosive Projectile Expert System Design

YUAN Zhi-hua, GUO Mei-fang, HAO Bo

2006, 27(1):  170-174.  doi:10.3969/j.issn.1000-1093.2006.01.038

Asbtract ( )   PDF (5072KB) ( )  

References | Related Articles | Metrics

HE projectile expert system, based on the expert system for designing HE shell, can imple?ment a series oi intelligent designs, such as design of HE projectile, scheme expounding and proving, emulation analysis, calculation etc. Aiming at the product design feature, the expert system develop?ment for design adopted the object-oriented knowledge representation and kinds of inference control en?gines to describe and reason the design knowledge of product by using a microcomputer. It is the foun?dation of emulation analysis and simulation manufacture of HE projectile. A method that the knowl?edge represention is combined with condition inference is used to carry out the overall design and emu?lation and reference. The paper gives the construction of the intelligent design expert system and the methods by whicn the functions can be achieved, achieves the modularization of reference and the de?sign methods of systematization, puts forward the method of knowledge represention and working in?terface, and supplies a platform for the similar products of HE projectile which can be quickly de?signed .

An Area Measurement Method of Cartridge Surface Ablation

LE Jing, GUO Jun-jie, ZHU Hong, LI Feng, ZHANG Tao

2006, 27(1):  175-178.  doi:10.3969/j.issn.1000-1093.2006.01.039

Asbtract ( )   PDF (3771KB) ( )  

References | Related Articles | Metrics

A novel non-contact, high accuracy and automatic area measurement method for cartridge surface ablation, which combines coordinates measurement with image detection, was presented. Basic requirement of design is to improve the measuring speed possibly under the prerequisite for ensuring expected measuring accuracy. Some key structures and parameters of the system components were de?signed .The corresponding measures were taken to ensure accuracy during scanning and mosaicing the surface of cartridge. An imaging system with manual adjustable parameters was selected, and the ve?racity of irregular ablation region segmentation was greatly increased using a gray unbalance method. Experiments and practical applications show that this method is reliable with certain accuracy and high efficiency for the area measurement on curved surface.

Functionary Mechanism of Integrated Manostat for Radio Fuze

GAO Jun, CHEN Chuan-bo, JING Yu-huan, LI Fu-sheng

2006, 27(1):  179-183.  doi:10.3969/j.issn.1000-1093.2006.01.040

Asbtract ( )   PDF (3876KB) ( )  

References | Related Articles | Metrics

Integrated manostat of electrical source was analyzed using the mechanism standard and the system discrimination standard. Response and restraining ability of the integrated manostat of electrical source was researched. The effect of the power noise on the normal functions of the radio fuze was il?lustrated with examples. The conclusions are as follows. The response of the integrated manostat to power noise can De regarded as steady noise, and the restraining ability is about 70 dB. Amplitude of the signal processing circuit for the Doppler radio fuze is reduced due to power noise, which may in?crease the bursting height. When the noise is high enough, early burst happens.

Vibration Suppression of Flexible Arm Based on State Feedback Control

CHEN Qing-wei，GUO Jian, WANG Xiao-hua, HU Wei-Ii

2006, 27(1):  184-187.  doi:10.3969/j.issn.1000-1093.2006.01.041

Asbtract ( )   PDF (3233KB) ( )  

References | Related Articles | Metrics

A flexible arm with some piezoelectric sensor and actuators was investigated to find a way to control the vibration of flexible structures. The distributed parameter model for this beam was estab?lished first. Then, the model was transformed into a set to lumped parameter models. A state feedback controller was used to suppress the vibration oi the flexible arm. The experiment results show that the low-order vibration is well controlled.

Robust H∞ Control of a Class of Network Control Systems with Time-delay

FAN Wei-hua, CAI Hua, WU Xiao-bei,HU Wei-Ii

2006, 27(1):  188-192.  doi:10.3969/j.issn.1000-1093.2006.01.042

Asbtract ( )   PDF (4190KB) ( )  

References | Related Articles | Metrics

The robust H∞ control of a class of networked control systems with uncertain delay is stud?ied. Supposed that the controller and actuator of the network control system (NCS) are event driven, the sensor node is time driven, the network induced delay is time-varying, uncertain and less than the sampling period, the generalized plant is modeled as an uncertain linear discrete system. Based on Lya?punov function and linear matrix inequality (LMI)，a sufficient condition for NCS which was subject to the asymptotic stability and H∞ performance was derived, and the design approach of the controller was also given. The simulation verifies the proposed approach.