Table of Content

29 April 2006, Volume 27 Issue 2

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Paper

Discharge Characteristic and Range Forecasting of Traction Battery in Electric Drive Tracked Vehicle

LI Jun-qiu, YAO Li-min, SUN Feng-chun, ZHANG Cheng-ning，GU Zhong-Ii

2006, 27(2):  193-197.  doi:10.3969/j.issn.1000-1093.2006.02.001

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Power balance of engine-off operation for electric drive tracked vehicle and discharge charac?teristic of traction battery were derived theoretically, the discharge efficiency map of ideal traction bat?tery was given on E^-P plane. The effect of different load power and discharge depth on battery effi?ciency was analyzed, so the economic driving conditions and a method to forecast range in engine-off operation were brought forward. DC pulse discharge method was used to measure traction battery effi?ciency, and the forecast experiment for range in engine-off operation was finished. The matching theo-ry between load power and traction battery is proved effectively.

A Method of calculating Primary Parameter of Water-Jet Propulsion System in Amphibious Vehicles

REN Ming-qi, FAN Zhi-you, ZHAO Chen,WEI Yue-qiang

2006, 27(2):  198-201.  doi:10.3969/j.issn.1000-1093.2006.02.002

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A new method of calculating the primary parameters of the water-jet propulsion system was put forward. Based on the designing speed of amphibious vehicle, input power of water-jet propulsion system, loss coefficients of the intake and the jet nozzle, the elevated height of water, the parameters such as the optimum velocity ratio, the maximum system efficiency, the optimum pump head and flow rate can be calculated.

A Design Method Based on Particle Swarm Optimization for PID Controller of a Servo System

LI Yin-ya, SHENG An-dong, WANG Yuan-gang

2006, 27(2):  202-205.  doi:10.3969/j.issn.1000-1093.2006.02.003

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An optimum design method based on particle swarm optimization (PSO) algorithm was pre?sented for PID controller of an artillery servo system. A new performance criterion evolution function combined with the system maximum position settling time, rise time, overshoot, steady state error, constant velocity position tracking error and sinusoidal position tracking error was defined. It is fast to calculate a PID controller to minimize the evaluation function by searching on the given controller pa?rameter space. The simulation results show that the proposed controller is effective.

A Study on Establishing the criterion of Current Firing Table Based on Hit Probability

ZHANG Ling-ke, WANG Zhong- yuan, WANG Feng

2006, 27(2):  206-209.  doi:10.3969/j.issn.1000-1093.2006.02.004

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The trajectory consistency testing criterion which is used to test whether two projectiles could use the same iinng table at the same time exists some problems. The testing criterion of current firing table was established based on the hit probability according to the fire theory, statistics and trial data. The criterion is much better to reflect a practical meaning and has an application value in some degree for defining current firing table.

Analysis on the Ballistic Characteristics of Gliding Extended Range Projectile

SHI Jin-guang, WANG Zhong-yuan，YI Wen-jun, WANG Feng

2006, 27(2):  210-214.  doi:10.3969/j.issn.1000-1093.2006.02.005

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The gliding flight of projectile is an efficient extended range technique. The flight process of gliding extended range projectile was explained. The whole flight trajectory was divided into three seg?ments and the ballistic model of every segment was established. The characteristics of the whole flight trajectory were studied. The result shows that the characteristics of climbing trajectory are same, while the characteristics of falling trajectory have obvious difference between gliding trajectory and or?dinary trajectory. The control strategy oi little step walk is adopted in rolling control segment and the open loop control is used in gliding control segment. The simulative results show that the control method is feasible and the conclusion is the same as the designed ideas. It can be used for the design of gliding extended range projectile in the future.

Simulation of Cylindrical Shell Damage by Fragments and Shock Waves

JIN Qian-kun

2006, 27(2):  215-218.  doi:10.3969/j.issn.1000-1093.2006.02.006

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Numerical simulation for damage tests of cylindrical targets under fragments and shock waves was investigated by use of a nonlinear dynamic explicit finite element method. The damage ac?tion was modeled by separating the fragment and shock wave loading, which makes the model simple and ensures the simulating precision. The rationality of selection of material models and the stability of mesh division are verified by damage tests of cylindrical shell under shock wave. The simulation results were compared with the experimental results to validate the rationality and practicability of simulation model. The calculated results indicate that the fracture damage of cylindrical shells can be created ef?fectively by fragment and shock wave loading together under a warhead-target action distance.

Numerical Analysis on Flow Field Characteristic of Ramjet Assisted Range Projectile

JU Yu-tao, ZHOU Chang-sheng, ZHU Fu-ya

2006, 27(2):  219-221.  doi:10.3969/j.issn.1000-1093.2006.02.007

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The governing equations of the simulation are the Reynolels-averaged Navier-Stokes equa?tions and k-e model is adopted for turbulence flow. The numerical scheme is second order windward scheme. I he characteristics of flow field of ramjet assisted range projectile were simulated by a numeri-cal method. The results show that the air drag coefficient is not obviously changed at high supersonic and is increased at low supersonic and subsonic, wmch is caused by the pipelike structure in the projec?tile.

The Model Study of General Ammunition Order

HUANG Chun-guang, SUN Tao, LIU Juan

2006, 27(2):  222-224.  doi:10.3969/j.issn.1000-1093.2006.02.008

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Some models suitable for general ammunition order were established, including economic or?der quantity (EOQ) model, operational effectiveness coefficient order model and comprehensive classi?fication order model. All such models or methods have obvious commonality and guidance.

Analysis of Chaotic Characteristics of Ocean Clutter Fuse Signals Using Double-channel Modulated Model

XIONG Gang, ZHAO Hui-chang, YANG Xiao-niu

2006, 27(2):  225-229.  doi:10.3969/j.issn.1000-1093.2006.02.009

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On the assumption that the oceanic echo signals of fuse are double-channel modulated model, the chaotic characteristics were analysed using the detected data of fuse. Ine result of calculation shows that both the modulated channels possess the fractional dimension and at least one positive Lya?punov exponent. It is concluded that, compared with the simple echo signal analysis, the analysis of chaotic parameters using presented model is more efficient and accurate. Also, the rationality of the as?sumption is proved.

Numerical Simulation of Penetration-then-Detonation of Concrete Target with Projectile

SONG Shun-cheng, LI Guo-bin, CAI Hong-nian, WANG Fu-chi

2006, 27(2):  230-234.  doi:10.3969/j.issn.1000-1093.2006.02.010

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The numerical simulation of penetration-then-detonation of concrete with projectile was pre?sented using smooth particle hydrodynamic (SPH) algorithm. In the penetrative stage the projectile was divided into standard Lagrangian finite element meshes, but the concrete was divided into ^PH nodes. The finite element meshes of the projectile were converted into smooth particles before the cal?culation of detonations. Through the 2-D computations of the penetration-then-detonation to concrete target with projectile, the final volume of the crater at concrete target and the curve of pressure vs. time of the products and the curve of expanding velocity vs. time of warhead shell are obtained.

Research on Energy Output Characteristics for Underwater Explosion of Explosives

ZHOU Lin, XTJ Shao-hui, XU Geng-guang

2006, 27(2):  235-238.  doi:10.3969/j.issn.1000-1093.2006.02.011

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The underwater explosion parameters (shock wave and bubble energy，shock wave pres?sure, factors (k and a ) of shock wave pressure) oi the different underwater weapons were measured, calculated, analyzed by the detonation parameters of different typical explosives. The experimental re?sult is very consistent with the calculated one. The calculation formula of factor (a) for shock wave pressure was firstly found, providing the scientific basis for the underwater explosive formulation de?signs, warhead designs and performance evaluation of explosives.

The Study on FTIR Spectra of Ammonium Dinitramide with Compounds of Isocyanate

ZHAI Jin-xian, YANG Rong-jie, LI Jian-min

2006, 27(2):  239-243.  doi:10.3969/j.issn.1000-1093.2006.02.012

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Compatibility of ammonium dinitramide(ADN) with three Kinds of isocyanates was investi?gated Dy Fourier transform infra-red (FTIR) spectrometry analysis. The isocyanates are N-100， toluene-2，4-diisocyanate(TDI) and isophorone dnsocyanate( IPDI). Three kinds of the mixtures com?posed of ADN with N-100, TDI and IPDI were treated at room temperature and 45℃，respectively. Consequently, it is found that ADN is incompatible with N-100 and 1DI，but compatible with IPDI under the experiment conditions.

The two-Level Selective Neural Network Ensembles Applied to Quantitative Analysis of Propellants

SHI Yan, HUANG Cong-ming

2006, 27(2):  244-247.  doi:10.3969/j.issn.1000-1093.2006.02.013

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During quantitative analysis of propellant based on near infrared spectroscopy (NIR)，neural networks are good tools for establishing calibration model, but there are still some problems to be con?sidered such as too much variables and “ over-fitting ”. To solve these problems, wavelet transform (WT) was used to preprocess the NIR，and the two-level selective neural network ensembles based on greedy algorithm with first improvement strategy，were proposed. Based on the ensembles, a cali?bration model for the quantitative analysis of propellant was established. Experiment results show that the model is easy to be built and promotes the generalization ability of neural network system.

Study on Special Foam Screen and Its Multi-band Interfering Performance

JIN Liang-an, WANG Xiao-tong, FU Jian-guo, YIN Xing-bo

2006, 27(2):  248-251.  doi:10.3969/j.issn.1000-1093.2006.02.014

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In order to overcome the shortcomings of the existing multi-band interfering techniques, a new interfering technique using special foam screen was put forward. Its interfering mechanism, the selected chemicals and the process of reaction were studied, and a foam screen set with an ejector was developed. The test results show that when the diameter of air bladder is about 0.5 mm, the special foam screen with 2?4 cm in thickness can interfere IR, MMW, CMW and visible light, and its inter?fering time can last for more than 0.5 h. The remains of this foam screen has no pollution to environ?ment.

Face Detection and Segmentation for Video Surveillance

SONG Hong, SHI Peng

2006, 27(2):  252-257.  doi:10.3969/j.issn.1000-1093.2006.02.015

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A fast approach of face detection for video surveillance was proposed. A symmetrical frame difference was used to acquire tne motion area. A simple and fast segmentation algorithm, 1.e. mid?point-guiaed growing, was developed to search the skin-like pixels and segment the face-like regions. The distribution information of shape and feature in each face-like region was examined and those re?gions satisfying with the knowledge of a human face were located and marked. The experimental re?sults show that the accuracy and processing speed are very promising. The approach can be used to de?tect multiple faces with different poses and sizes. It is a practical method for developing visual surveil?lance system and can be used as a start point for face tracking research.

Signal Recognition of Sine FM and Interpulse Pseudo Code PM Based on Spectral Correlation Method

ZHAO Hui-chang, XIONG Gang, YANG Xiao-niu

2006, 27(2):  258-264.  doi:10.3969/j.issn.1000-1093.2006.02.016

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The spectral correlation function(SCF) of the reconnaissance signal combined sine FM and interpulse pseudo-random code PM was deduced. A recognition algorithm was given, wmch included the estimation of carrier frequency, modulation frequency, modulation coefficient, and the width and period of subpulse and coding number based on the characteristic of SCF of narrowband and broadband FM. The influence of SNR on parameter estimation precision was analyzed. The simulation results show that the NRMSE of estimation of carrier frequency and modulation frequency is less than 2.5% when SNR is equal to — 5 dB, and the NRMSE of pseudo-random code less than 7.5% when SNR is more than 0 dB.

On-line Reliability Estimation and Performance Prediction for Metallized Film Pulse Capacitor

ZHAO Jian-yin, LIU Fang, SUN Quan, ZHOU Jing-Iun

2006, 27(2):  265-268.  doi:10.3969/j.issn.1000-1093.2006.02.017

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High energy density self-healing metallized film pulse capacitor is the key component of iner?tial confinement laser nuclear fusion facility. Because of different capacitors and variable environment, the reliability is different among the same batch capacitors. The end users of the capacitors are typical?ly more interested in the behavior of a ‘ particular，component used in their system to arrive at optimal component replacement or maintenance strategies leading to improving system utilization. Using degradation analysis method, a degradation failure model to estimate the reliability and predict the per?formance of the metallized film capacitor was presented. The results of the test data analysis prove that tnis method is applicable.

A Detection Method of Network Intrusion Based on Learning Petri Nets

WEI Sheng-jun，HU CHang-zHen, GAO Xiu-feng

2006, 27(2):  269-272.  doi:10.3969/j.issn.1000-1093.2006.02.018

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A method of intrusion detection based on neural network(NN) has flaws of slower learning speed, hardness in converging and deficiency of classifier capability. The learning Petri nets(LPN) were adopted to construct the method of network intrusion detection. LPN is superior to NN in the re?alization of nonlinear and discontinuous functions. The test result indicates that the classifier based on LPN has better recognizing precision and faster learning speed compared with the classifier based on the same structure NN.

GOOPN+ + Based Model for Capability Assessment of Equipment Support

ZHANG Tao, GUO Bo, TAN Yue-jin, WU Xiao-yue

2006, 27(2):  273-277.  doi:10.3969/j.issn.1000-1093.2006.02.019

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A new generalized object-oriented Petri net (GOOPN + + ) model which can be used to eval?uate the capability of equipment support was proposed. Its formal definition was given. The abstract place, abstract transition, message color and the message transferring function between objects were introduced in this model. This model has good modularity, inheritability, reusability, and maintain?ability, and can reflect flexibility and dynamic features of complex system. An example was given in the paper.

Modeling and Analysis of the Networked Control System with Long Delay

FAN Wei-hua, XIE Rong-hua, CHEN Qing-wei, HU Wei-Ii

2006, 27(2):  278-283.  doi:10.3969/j.issn.1000-1093.2006.02.020

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To deal with the problems of dropout and disorder of data packets in the transform process, the networked control system with long delay, wmch contains the event-driven controller and time- driven sensor and actuator, is modeled as a discrete linear system with time-varying control delay. Based on this model, the effect of time delay on the performance of closed loop system is analyzed. By using Lyapunov method, the delay dependent stability condition is given, subject to the asymptotic stability. And the solution to obtain the maximum delay, with which the closed loop system remains stability, is achieved by the aid oi linear matrix inequality( LMI) . t mally, an example is given to vali-date the effectiveness of the methods presented in this paper.

Strap-down North Finder Azimuth Error Analysis

XU Jian-hua, LIU Xing-qiao, CHEN Jia-bin

2006, 27(2):  284-287.  doi:10.3969/j.issn.1000-1093.2006.02.021

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The north finder error was studied using the basic theory of strap-down inertial system. It is found that when the attitude angle is nonzero, the azimuth error is partly caused by the disagreement of coordinates with latitude error. And based on this, the theoretic criteria of the azimuth and attitude compensation were partially put forward. Simulative and testing results show that the azimuth error is the function of azimuth, latitude and attitude.

Study on Models of Gyroscope- free Strap-down Inertial Navigation System

WANG Xiao-na, WANG SHu-zong, ZHU Hua-bing

2006, 27(2):  288-292.  doi:10.3969/j.issn.1000-1093.2006.02.022

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The angular velocity was computed using accelerometers instead of angular velocity gyro-scopes in gyroscope-free strap-down inertial navigation system (GFSINS) . The models for computing the parameters about the carrier motion of two kinds of 6-accelerometer configuration GFSINS schemes were established under considering gravitational effect. Based on this, a 12-accelerometer configuration scheme was proposed. The algorithm is optimized using the sensor redundant information and the ac?cumulative error deriving from the solution of differential equations is reduced and the accuracy of the computed angular velocity is increased.

The Researcn on the Effect of Certain Graphite-spray on Reducing MMW Anti-tank Missile Destroy Probability

ZHAO Zhan-xiang, LI Xing-guo, YANG Guo

2006, 27(2):  293-296.  doi:10.3969/j.issn.1000-1093.2006.02.023

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The efficiency interfering with MMW using graphite-spray was investigated by calculating quantitatively attenuation quantity of the anti-tank missile destroy probability. It is clear from data processing that the graphite-spray is capable of decreasing the anti-tank missile destroy probability. Its innovation lies in the indirect evaluation method by calculating the decrease of the campaign aim index. Double-independent variables function is changed into single variable function by setting several repre?sentative values to one independent variable, namely setting several representative false alarm rates to resolve the function value diversmcation with the double-independent variables. Some suggestions to the application of grapmte-spray are put forward in the end.

Missile Maintenance Training System Based on Virtual Reality Technology

YANG Yu-hang, LI Zhi-zHong, FU Kun, DONG Wei, ZHENG Li

2006, 27(2):  297-300.  doi:10.3969/j.issn.1000-1093.2006.02.024

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Maintenance training using desktop virtual reality technology has various advantages, such as low cost and safety. Based on the technology, a missile maintenance training system (MTS) was de-veloped .Training work can be launched even when the design is just finished and the production is be?ing prepared. Functional arcnitecture and implementation were introduced in. The system can be cus?tomized to be a specific application system for maintenance training of a specific product and mainte?nance mission. A control box of a missile is taken as an example to illustrate the implementation of a specific application system and performance of the developed system.

A New Technology to Improving iring Dispersion of Multiple Launch. Rocket System

RUI Xiao-ting, WANG Guo-ping, LU Yu-qi,YUN Lai-feng

2006, 27(2):  301-305.  doi:10.3969/j.issn.1000-1093.2006.02.025

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The influence of firing order and firing interval on vibration characteristic and firing disper?sion of multiple launch rocket system (MLRS) was analyzed. The method to improve firing dispersion by optimizing firing order and xirmg interval was presented. Using transfer matrix method of multi?body system and launch dynamic theory, the relations between the firing order and firing interval vs. performance of MLRS were established. The new technology is developed by optimizing firing order and iiring interval of MLRS. The test results show that firing dispersion of MLRS is improved.

Measurement of Bond Strength of Coating Using Stress Wave

HOU Zhen-de, TANG Ling-xia, FU Dong-hui,ZHANG Zeng-fu，TIAN Xin-Ii

2006, 27(2):  306-309.  doi:10.3969/j.issn.1000-1093.2006.02.026

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A way of measuring tensile bond strength of coating is presented in this paper. When a com?pressive stress pulse is generated by an impact at one end of a bar, the pulse reflected from the other end (free end) becomes a tensile wave in terms of the one dimension linear theory of stress wave. If a film is coated on the surface of the free end, the tensile stress acts on the coating interface, and in case of large enough amplitude, the coating can be pulled apart. In above mentioned method, the measure?ment of tensile bond strength of coating can be accomplished. The characteristics of tensile stress pro?duced on the coating interface by stress pulse were analyzed. Stress pulses were obtained and tested us?ing Hopkinson pressure bar technique. The bond strength of an iron-base coating material was mea?sured and the validity of the method was proved.

Dynamic Simulation of Ni Particle Behaviors in Supersonic Oxygen/Air Fuel Spray Process

WANG Han-gong, YUAN Xiao-jing, HOU Gen-liang,YAO Chun-jiang

2006, 27(2):  310-314.  doi:10.3969/j.issn.1000-1093.2006.02.027

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Using a dispersive particle model and a particle tracking technology, a three-dimensional computational particle model on supersonic oxygen/ air fuel (SO/AF) spray was constructed and the processes of particle acceleration and calefaction were simulated. The result shows particle velocity and temperature laws in SO/AF spray process. At the muzzle, particle behaviors and the influence of parti?cle size on particle velocity and temperature were analyzed at SOF, SO-AF, and SAF. Repeating with different grain size calculation, the results indicate that particle velocity and temperature decrease with the increment of gas initial parameters and particle size. The process plays an important part in spray?ing high quality coat.

Preparation of Shaped Tungsten Product by Chemical Vapor Deposition

MA Jie, ZHANG Hao-dong, BI An-yuan,WANG Cong-zeng, ZHOU Mei-Iing

2006, 27(2):  315-319.  doi:10.3969/j.issn.1000-1093.2006.02.028

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Using WFg and H2 as precursors, many kinds of dense shaped tungsten products were suc?cessfully developed by chemical vapor deposition. The results show that the deposit is of high purity (〉99 ? 8 % ) and high density (〉19 ? 2 g/cm3 ) . The microstructure of deposit is columnar crystal with preferential growth in the direction of (200) . The deposition rate can be 2?3 mm/h. The application of chemical vapor deposition method in preparing shaped tungsten product possesses a bright future due to simple equipment, reliable process and the product of nigh quality.

Study on Reliability of Piezoelectric Truss structure with Multi-random Parameters

YANG Duo he, AN Wei-guang, WANG Bin-sheng, MIAO Han

2006, 27(2):  320-324.  doi:10.3969/j.issn.1000-1093.2006.02.029

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In the piezoelectric truss structure with multi-random parameters, taking the mechanical- electric coupling effect into account under electric load and mechanical load, the formulas of safety margins of bar were proposed by using the intensity of breaking, disruptive electric field intensity, bar section area and loads as stochastic variables. On the base of above research, stochastic finite element method was adopted to attempt to analyse reliability of the piezoelectric truss structure. In the end, the example is given to demonstrate the efficiency of this method.

Backlash Nonlinearity Switching Control with Proximate Time Optimal Compensation

ZHAO Guo-feng, SONG Yang, GUO Jian, HU Wei-Ii

2006, 27(2):  325-329.  doi:10.3969/j.issn.1000-1093.2006.02.030

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Based on servo system, a backlash nonlinear switching control scheme with PTO ( proximate time optimal) compensation was presented. With linear controller used in contact period, sliding con?trol with PTO surface is switched into when system entering backlash. A supervising mechanism was introduced to find suitable moment switching from linear control to PTO sliding control, ensuring boundary input and boundary output (BIBO) stability of the whole system. The design can effectively eliminate the colliding disturbance resulting from backlash and improve the robustness of controller.

Comprehensive Reviews

New Technologies to Extend the Erosion Life of Gun Barrel

CHEN Yong-cai, SONG Qiu-zhi, WANG Jian-zhong

2006, 27(2):  330-334.  doi:10.3969/j.issn.1000-1093.2006.02.031

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The erosion and wear of gun barrel can reduce the gun barrel erosion life and restrict the gun development. The new technologies to extend the erosion life of gun barrel are summarized m this pa-per including laser heat treating of the inner face of gun barrel, manufacturing of composite gun barrel and coating of the inner face of gun barrel. Then every technology was studied according to the struc-ture and principle of gun barrel. In the end, a suitable method to extend the erosion life of gun barrel was proposed.

Experimental Techniques and Analysis

Study on Stress Field of Spherical Anti- penetration Plate Acted by Impulsive load Using Dynamic Photo Elasticity

ZHANG Hong-mei, LXJ Yu-sheng, CHU Wei-jun, LIAN Zhi-ying

2006, 27(2):  335-338.  doi:10.3969/j.issn.1000-1093.2006.02.032

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Stress field of spherical anti-penetration plate acted by impulsive load using dynamic photo e- lasticity was investigated. The rationality of the plate construction with same thickness was put for?ward. At the same time the influence of reflex stress wave and stress concentration on anti- penetration plate was analyzed, then some design principles and improvements were proposed.

An experimental Research of the Removal-TNT with Manganese- catalyzed Ozonation Processes

WU Yao-guo, HUI Lin, ZHAO Da-wei,FENG Wen-lu, WANG Qiu-hua

2006, 27(2):  339-342.  doi:10.3969/j.issn.1000-1093.2006.02.033

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Comparative experiment of O3 and Mn( II )-catalyzed ozonation processes were conducted with 2,4, 6-trinitrotoluene (TNT) as the model pollutant to research the efficacy of Mn( II ) for en?hancing ozonation. It is found that Mn( II )-catalyzed ozonation greatly increases the removal efficiency of TNT and COD compared with that achieved by ozonation alone. Several factors that are likely to in?fluence Mn( II )-catalysed ozonation process in practical application are investigated. Experimental re?sults demonstrate that the factors include the wastewater pH and TNT concentration, the catalyst dosage and its adding method, ozone dosage and concentration.

Application Study of a Accelerometer in Nongyroscopic North Seeking System

ZHAO Yan, ZHAI Bai-chen, WU Ke-yong, CHEN Tao

2006, 27(2):  343-346.  doi:10.3969/j.issn.1000-1093.2006.02.034

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In the accelerometer dynamic north seeking system, the special application methods of the accelerometer were discussed based on the accelerometer theory and the working mechanism of the sys?tem. The specific uses include measuring the north component of the earth spin rate, the slant angle of the gimbal and the motor speed. The study results show that the orientation precision of the north seeKing is improved by applying the accelerometer to a north seeking system skillfully and making use of its characteristics fully. The paper has the referenced meanings for the reconstruction of the conven?tional servo system.

The Strain Hardening Law of Micro-structure of WHA Tested by a Nanoindentation Method

HUANG Wei, ZHAO Bao-rong, SHI Hong-gang, SHANG Fu-jun, LI Ya feng

2006, 27(2):  347-350.  doi:10.3969/j.issn.1000-1093.2006.02.035

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The differences between micro-properties and macro-properties for WHA are researchers’ research focus. The hardness and elastic modulus of micro-structure of WHA were tested by a nanoin-dentation method and the strain hardening law of micro-structure of WHA was deduced from the re-sults of macro-experiment. This law allows us to simulate the nanoindentation experiment, compare the results of the simulation and the experiment proves the validity of the law.

Short Papers

Circuit Simulation of a Nonlinear Resonator with Its Application in Weak Signal Extraction

YANG Ding-xin, HU Niao-qing, WEN Xi-sen

2006, 27(2):  351-354.  doi:10.3969/j.issn.1000-1093.2006.02.036

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Due to existing some shortcomings of using Duffing resonator in weak signal extraction by means of numerical method, a scheme of circuit simulating of the resonator instead of numerical method was proposed to fulfill the real time requirement. A kind of variable substitution in processing high frequency signals was suggested to improve the feasibility of the resonator in practical use. The experimental results snow that the scheme is suitable for weak sinusoidal signal detecting and the ex?traction of weak periodic pulse trains from strong noise background using the nonlinear resonator which is better than traditional linear filtering method.

The Simulation of Damage Effectiveness of a Volume Target

LIU Cheng-Ii, Lü Zhen-zhou

2006, 27(2):  355-359.  doi:10.3969/j.issn.1000-1093.2006.02.037

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A new type of shoot target, a space volume target is presented. Based on the relative damage volume, the stochastic simulation of the damage effectiveness of a space volume target is discussedAnd the results from the calculating examples show that the method has a certain rationality and feasibility.

Analysis and Improvement of Secondary sampling Plan of the Reliability

WANG Wei, WANG Jun-bo, HUANG Jing-de

2006, 27(2):  360-362.  doi:10.3969/j.issn.1000-1093.2006.02.038

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The reliability index in acceptance test of guidance ammunition is strictly required. Because guidance ammunition is expensive and the destructibility is inevitable in the testing, the sample size is small. A current secondary sampling plan of the reliability is analyzed. In the plan, the consumer ’s risk is too big. Two improved plans were given. Converting subsystem test data into system test data, the second sampling plan is replaced with a third sampling plan; Bayes sampling plan with test data of some former lots is investigated. Using the improved plans, the producer’s risk and the consumer’s risk can be controlled at the reasonable level with small sample.

Research Notes

Interactive Simulation of Electronic and Hydraulic cServo System about Clustered Canister Rocket Launching Platform

FENG Yong, MA Da-wei, SONG Xiao-feng, LI Lin

2006, 27(2):  363-366.  doi:10.3969/j.issn.1000-1093.2006.02.039

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Interactive simulation of electronic and hydraulic servo system is studied using mature soft?ware and interfaces. Interactive simulation of this servo system has been completed. It can be used to determine or verify all kinds of parameters about hydraulic and electronic loop. Moreover, the con-firmed. parameters of the servo system have a certain sense of theoretic instruction for the real proto?type s research and manufacture.

The Application of USB Interface to a Vehicle-carried Data Acquisition System

Li Yuan-zhe, JING Min, CHE Deng-shan,LIU Hui-feng, LONG Ze

2006, 27(2):  367-370.  doi:10.3969/j.issn.1000-1093.2006.02.040

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A vehicle-carried data acquisition system was introduced in brief. The application of USB in-terface to the system was conducted and tested. USB data transmission between the master- computer and slave device in the data acquisition system was achieved by U^BlOO module. The programming scneme was also provided. The techniques mentioned above are useful to solve the problem of data transmission in data acquisition system.

A New Algorithm of Robust H∞ Filter with Constraint of Variance

WU Qin, GUO Zhi

2006, 27(2):  371-374.  doi:10.3969/j.issn.1000-1093.2006.02.041

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H∞ filtering problem under the constraint of variance was discussed for a class of linear stochastic uncertain system. A new algorithm of robust filter design was proposed which avoids strict constraint in constructing diagonal matrix to meet upper bound of variance. The robust filter with both constraints of variance and H∞ was given based on linear matrix inequality (LMI) . Comparing with other existing filtering algorithms, less filtering gain and less filtering variance were achieved under the allowed free parameter condition. And the numeric example proves the validity of this method.

Blast-resistant Calculation of Compound Structure with Porous Material Under Impact Load

WANG Yu-xin, GU Yuan-xian, SUN Ming

2006, 27(2):  375-379.  doi:10.3969/j.issn.1000-1093.2006.02.042

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The porous materials can absorb impact energy, but it can not be singly used for blast-resis?tant structure due to its low strength. To reduce the destruction of shock wave, a multi-layer com?pound structure for blast-resistant is constructed by adding porous materials in concrete wall or between steel plates. The impact load enforced on target can be effectively relieved. When a flyer impacts a tar?get at high speed, the porous material layer is compacted. The intensity of stress wave can be greatly decreased because of lower wave impedance and plastic deformation. Thus, the impact energy of flyer is cut down. Compared with one layer structure, the blast-resistant capability was improved. To study the blast-resistant mechanism of multi-layer structure, a dynamic constitutive model for steel plate and porous material was applied to calculate impact load and propagation of stress wave in three-layer mate?rials. Based on one dimensional stress wave theory, the damping of impact load and stress wave in the compound structure was investigated.

Design ancl Flying-test of “Angel Bird” WIG boat

ZENG Rui, Ang Hai-song

2006, 27(2):  380-384.  doi:10.3969/j.issn.1000-1093.2006.02.043

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WIG (wing in ground) boat is an advanced vehicle which mixes the advantages of ship and plane. It will be used widely in the future. Angel Bird” six-seats WIor boat was specially designed for oversea transportation. It employs joined-wing configuration^ and is all made in FRP composite mate?rial. All of these new technologies make “Angel Bird” more suitable for navigation on sea comparing with conventional WIG boat. “Angel Bira” has been flying-tested for several times and performed its good performances. Besides, Angel Bird is cheap and economic.