Table of Content

31 October 2006, Volume 27 Issue 5

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Paper

Analysis of Principle of Hydro- mechanical Complex Steering for Positive Independent Dual-stream Transmission

LIANG Jian

2006, 27(5):  769-774.  doi:10.3969/j.issn.1000-1093.2006.05.001

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A principle of hydro-mechanical complex steering of positive independent dual-stream trans?mission for tracked vehicle was put forward. A basic principle and a controlling method were explained by analyzing the kinematics, dynamics and power streams. This principle was that both hydraulic and mechanical steering power streams were separately transferred by hydro-mechanic transmissions in the positive independent dual-stream transmission system, and combined by steering planetary gear set, transferred to the power summing planetary gear set. Therefore, the hydraulic power streams could control vehicle to speed down one-side track for stepless continuous steering, and the mechanical power streams could share some parts of the main power to reduce the burden (1.e. the rate) of the hydraulic power streams. The principle expresses that the step steering with brake can be improved to hydraulic stepless steering in the positive independent transmission system; the displacement and power of hy?draulic pump and motor can be reduced comparatively; the lighter weight and smaller volume of posi?tive independent dual-stream transmission are retained. It is possible to spread and adopt this valuable feasible principle.

Numerical Simulation Analysis of HPD Diesel Engine

ZHANG Wei-zheng，YUAN Yan-peng, GUO Liang-ping,WEI Chun-yuan

2006, 27(5):  775-778.  doi:10.3969/j.issn.1000-1093.2006.05.002

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A numerical simulation analysis of a high power density(HPD) diesel engine (volume power approaches 92 kW/L) perhaps used in the field of the military target is carried out in this paper. The main factors which influence the performance of engine were touched upon, and the key measures were also presented.

An Analysis of Steering Track for Tracked Vehidle at Inaccurate Steering

TANG Jiu-wang, LIU Wei-ping, LIU De-gang,CHENG Gang

2006, 27(5):  779-783.  doi:10.3969/j.issn.1000-1093.2006.05.003

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With the increasing complication of configuration and function in anveline of tracked vehi?cle, it is necessary to improve the technology of steering control. The relations between inaccurate-ra?dius turning and brake-force in inner-track were analyzed. Then, a turning dynamic simulation model and a contrail computing model were developed, and the turning contrail of tracked vehicle’s turning process under different modes of brake-force in inner-track was simulated. The simulated result is in favor of the study and design of new driveline and its control scheme.

The Application on Electro- hydraulic Proportional Valve for Buffering Control of VehidLe Shift Clutch

LIN Feng, LIU Ying, CHEN Man

2006, 27(5):  784-787.  doi:10.3969/j.issn.1000-1093.2006.05.004

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A close-loop control of the electro-hydraulic buffering control in the vehicle transmission was realized by applying an electro-hydraulic proportional decompressing valve and a dynamic math model was created. On the basis of simulation and experimentation, the dynamic characteristics of electro-hy- draulic proportional buffering control system with PID and DMC control were discussed.

Integration Design Method of Structure and Control for a Shell Transfer Arm

HOU Bao-lin, QIAO Jun-mou，HAN Hong-chao

2006, 27(5):  788-791.  doi:10.3969/j.issn.1000-1093.2006.05.005

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The purpose of this study is to explore the methodology of integration design of structure and control for a shell transfer arm of howitzer autoloader. Based on the mechanism scheme of shell transfer, the controlled dynamic equations were established, the PID control gains were obtained through an optimal algorithm, the dynamic response of a shell transfer arm was computed at different object angles, ana the located accuracy of the shell was evaluated. In order to achieve a lightweight shell transfer arm, an elastodynamic equation of the shell transfer arm was established and solved for different section sizes using finite element method. As a result of this analysis, an optimal section of the arm was obtained. The design methodology for the shell transfer arm proposed in this paper can improve its design quality and successful rate.

Simulation on Decreasing Ammunition Consumption for Test of Some Multiple Launch Rocket System

ZHANG Xue-feng, MA Da-wei, LE Gui-gao, ZHU Zhong-Iing

2006, 27(5):  792-796.  doi:10.3969/j.issn.1000-1093.2006.05.006

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A method of decreasing experimental ammunition consumption was studied with a systemic simulation method for a multiple launch rocket system. First, the method to determine a group of par-tial loaded ammunition was given. Second, the cases of fully loadea ammunition and partial loaded am?munition were simulated and calculated respectively by the following models ： I) a burning gas flow model used for calculating the force and moment generated by burning gas jet impinging of launch de?vice; 2) a launch dynamic model used for analyzing and modeling the annular displacement and veloci?ty; 3) an exterior ballistic model used for calculating the firing dispersion based on the barrel parameter results from a launch dynamic analysis. finally, a verification of degree of confidence was done. The simulation results show that there is no marked difference for dispersion index if the ammunition is re?duced from forty salvo to twelve salvo.

The Modeling and Simulation of Interior Trajectory for Cluster Munition Dispersing

XU Wen-xu, ZHANG Jing, QI Zhan-yuan, ZHENG You-xiang

2006, 27(5):  797-801.  doi:10.3969/j.issn.1000-1093.2006.05.007

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A interior ballistic mathematical model of steel gasbag ejection machanism of cluster muni?tion was presented, including the processes of propellant combustion, steel gasbag charge, and bullet dispersion. The interior ballistic performances of this system were calculated to obtain the pressure in pressure chambers, the velocity and acceleration of submunitions using a simulation method. The sim?ulating results show that the dispersing results by simulating are similar to those by testing.

Analysis of Mechanical Characteristics of Ballistic Spring Under High Rotation Speed

LU Wei-jie, RUI Xiao-ting, LIU Jun

2006, 27(5):  802-806.  doi:10.3969/j.issn.1000-1093.2006.05.008

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It is one of the important factors in fuse safety analysis whether tremendous change of the ballistic spring force occurs or not at high speed. The mechanical characteristics of ballistic spring un?der high rotation speed were analyzed by analytical calculation and finite element methods, and the re?sults from the two methods were compared. The results show that the inertial forces have less effect on deformation of ballistic spring within a limit range of rotation speed, and the deformation can be ig-nored. Large deformation only occurs in the case of very high rotation speed. The conclusion shows that the reason of early burst in shooting tests is not due to the force change of ballistic spring under high rotation speed.

The Design of Adaptive Interference Cancellation Unit of Pseudo- random Code Phase Nlcxiulation Fuze Based on Time-frequency Analysis

ZHANG Qing-hui, LI Ping，QIAN Long,YAN Xiao-peng

2006, 27(5):  807-810.  doi:10.3969/j.issn.1000-1093.2006.05.009

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Time-frequency analysis method is an effective method of identifying the narrow-band inter?ference in the wiae-band spread spectrum signal. A time-frequency analysis method of extended dis?crete-time Wigner-Ville distribution (EDTWD) was used to extract and reconstruct the narrow-band interference in the received signal of pseudo-random code phase modulation fuze in the thesis. Then the interference was cancelled by the adaptive interference cancellation. The method doesn’t require any prior knowledge of interference signal, makes the received signal distorted little and can also be used in the circumstance of some interference sources. The algorithm theory and design process of the method was proposed, and the simulation result was offered.

The Jamming of Pseudo-random Code Phase-modulation Fuze and Hardware Implemented Circuit

HU Ze-bin, ZHAO Hui-chang

2006, 27(5):  811-816.  doi:10.3969/j.issn.1000-1093.2006.05.010

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The principle of pseudo-random code phase-modulation fuze was described simply. A scheme of spot and deception jammer was put forward on the basis of this. The circuit principle of each part and its hardware implemented circuit were presented including mainly the demodulation of pseudo-ran?dom code phase-modulation signal by use of swept oscillator and Costas loop, the recognition and re?construction of pseudo-random code sequence based on FPGA, the modulation and transmission of in?terfered waveform. The jamming effectiveness was described in the presence of bit width error caused by hardware implemented circuit. The maximum error value allowed was given in the case of successful jamming. According to test results of circuit, the whole scheme is feasible.

Burning Model and Simulation of Solid Ignition Grain of Thermal Power Underwater Vehicle System

ZHANG Jin-jun, QIAN Zhi-bo, YANG Jie, YAN Ping

2006, 27(5):  817-822.  doi:10.3969/j.issn.1000-1093.2006.05.011

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The starting characteristics of thermal power underwater vehicle system is determined by the geometry, size and burning area of the solid ignition grain, which has a direct effect on the liquid pro?pellant pipeline design. It is of course necessary to establish the accurate burning models of solid igni?tion grain. Based on the burning models of two different solid ignition grains and powder ring, the starting process mathematic models of the power system were built. With the help of Matlab a series of imitating calculations were made for the effects of different grains on the starting process characteris?tics. The results snow that end-burning grain will give better behavior to the starting process of the thermal power underwater vehicle system.

A Method for Edge Extraction of Bar and Strap Laser Spot in Changing Background

DANG Li-ping, LIU Jun-hua, GUO Xian

2006, 27(5):  823-826.  doi:10.3969/j.issn.1000-1093.2006.05.012

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To detect a center of laser spots formed by many laser tubes at an open environment, two threshold division and morphologic filter were considered based on the identifying principle of human eye vision, and a novel method of edge extraction of laser spot was presented. The influence of back-ground brightness variation on facular center position was avoided in terms of image pre-processing of decreasing background. An algorithm was operated more rapidly by use of grey-scale and grey-scale contrast as a threshold to divide laser image. Then the morphologic operators with a square model are executed to detect the image edge so as to eliminate the inner details and retain the edge continuity. This method was used to detect 906 nm laser spot center in all weather, and the experimental results show that the precision of detecting center of laser spot in real time is satisfied, and the error of repli?cate measurement is 2% .

Hilbert Transform Associated with the Linear Canonical Transform

LI Bing-zhao, TAO Ran, WANG Yue

2006, 27(5):  827-830.  doi:10.3969/j.issn.1000-1093.2006.05.013

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Hilbert transform(HT) is an important signal processing tool that is used in many applica?tions such as modulations, edge detection and filter design in signal processing. An analytic signal and its original signal are connected by the HT. At the same time, the linear canonical transform (LCT) is the generalized form of Fourier transform and the fractional Fourier transform, it can be considered as a general linear transform. The definition and properties of Hilbert transform in linear canonical trans?form domain were proposed. Some important properties of this kind of Hilbert transform were given, and it is shown that the newly defined Hilbert transform has some similar properties with the Hilbert transform in the traditional Fourier transform domain.

A Nonuniformity Correction Algorithm with Time-domain Statistics

ZHANG Jun-ju, SUN Lian-jun, WANG Shi-yun, CHANG Ben-kang, QIAN Yun-sheng

2006, 27(5):  831-835.  doi:10.3969/j.issn.1000-1093.2006.05.014

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The nonuniformity of infrared focal plane arrays (IRFPA) was analyzed from the probability density functions of the input irradiance and read-out response. And then an adaptive algorithm was presented, which carries out nonuniformity correction utilizing the time-domain statistics of IRFPA. The gain and bias of each detector are regarded as random state variables modeled by a discrete nonsta- tionary process, wmch provides a mechanism for capturing the slow and random drift in the fixed-pat- tern noise as the operational conditions of IRFPA vary in time. A time-domain histogram of each de?tector derived from its read-out response values sampled over a short period of time, was used to esti?mate and to calculate its gain and bias, in spite of the kind of distribution of the input irradiance. An autoregressive model was designed to update the detector gains and biases as these parameters drift. The performance of the proposed algorithm was thoroughly studied, and its utility in reducing nonuni-formity was demonstrated with a real infrared imagery.

The Application of Wavelet Transform in Optical Correlation Target Recognition

WANG Mian, WANG Jing-jing, WANG Bo, WANG Wen-sheng

2006, 27(5):  836-840.  doi:10.3969/j.issn.1000-1093.2006.05.015

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Hybrid optoelectronic real-time joint transform correlator can realize target auto detection, recognition and location. But in fact, the target image collected from the imaging sensor has low con?trast and large background noise. It greatly increases the difficulty of target recognition and results in low recognition rate. Wavelet transform is applied to the field of optical correlation target auto detec?tion and recognition based on its multi-resolution characteristic which can largely embody the informa?tion of an image. Wavelet transform was used to correlate with joint transform correlator and more sharp correlation peaks were obtained by investigating wavelet image enhancement of object surface. As a result, the recognition of targets with cluttered scenes and low contrast has been realized and ex?perimental results firmly testify the fact that using wavelet transform in the Iiled of optical correlation Kas a good future in application.

Numerical Computation on Lyapunov Characteristic Exponents of Nonlinear Vibration for a Nano-oscillator

YANG Guo-lai, CHEN Yun-sheng

2006, 27(5):  841-844.  doi:10.3969/j.issn.1000-1093.2006.05.016

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A model of nonlinear vibration for a nano-oscillator was developed. Lyapunov characteristic exponents (LCEs) provide quantitative criteria allowing one to distinguish between regular and chaotic behaviors for the dynamical system. It is difficult to perform numerical integration in terms of standard explicit Runge-Kutta method to obtain the converged LCEs when the motion of system is chaotic. The implicit and symplectic Runge-Kutta approach was presented to solve the differential equations in which the norm of Lyapunov direction vector is corrected to avoid the emergence of overflow error, and the converged LCEs can be solved by means of this algorithm.

Control of Dynamic Position System for AUV with Multiple Thrusters

WANG Ting, SONG Baowei

2006, 27(5):  845-850.  doi:10.3969/j.issn.1000-1093.2006.05.017

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For long-range and low speed AUV, dynamic location depending on vertical and horizontal thrusters, no rudders was studied at large attack and slide angles. The situation when the attack angle and the slide angle are 90° was discussed. A nonlinear model in that situation was designed and the variable structure controlling law was used to make the AUV get to the dynamic position in the vertical and horizontal planes. The simulated results show that the vehicle can basically achieve the giving posi?tion and the orientation.

Maintenance Support Modeling and Simulating Technology for Missile Weapon System

GUO Lin-han, ZHANG Wen-jian, KANG Rui

2006, 27(5):  851-856.  doi:10.3969/j.issn.1000-1093.2006.05.018

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According to system engineering modeling idea, a maintenance support simulation model of missile weapon system was presented, including mission, function, maintenance process and resource utilization process. Taking a missile for example, by using Monte Carlo simulation method, the main?tenance support simulation experiment was analyzed and the evaluative parameters of operational and support capabilities were acquired.

The Combination Forecasting Model of Aero engine Maintenance Cost Based on Statistic Rough Set Theory

XIE Qing-hua, LIANG Jian, ZHANG Qi

2006, 27(5):  857-861.  doi:10.3969/j.issn.1000-1093.2006.05.019

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Airlines pay closed attention to maintenance cost for efficiency improvement and fuel con?sumption reduction. As the limitation and shortcoming of forecasting model using single mathematic method, a new idea of performing combination model instead of selecting model methods was pro?posed .A key point of combination model is to determine the weight coefficients. Based on the rough set theory, it employs the uniformity of rough sets and statistical methods to find out the significance of each attribute by its knowledge entropy. Then the weight coefficients could be calculated by deter?mining the significant degree of each one. According to the experimental results, the proposed new model can obviously improve the prediction accuracy than the single model. This combination model has been partly adopted by airlines, which has proved helpful in reducing the airlines cost.

Queuing Network Method for the Combat Effectiveness Analysis of Mixed- mode Air-defense Systems

PAN Shu-shan, MA Da-wei, LI Zhi-gang

2006, 27(5):  862-864.  doi:10.3969/j.issn.1000-1093.2006.05.020

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The queuing network method was selected for diverse types of air-defense weapons at differ?ent nodes, and queuing network model was built up for the combat effectiveness analysis of mixed?mode air-defense systems according to tiring effectiveness criteria. This makes the analysis of influence for each clement on combat effectiveness more intuitionistic and easy. It enriches the application of queuing theory method to the evaluation of combat effectiveness of weapon systems.

The Forecast of Economic Life for Torpedo Based on Historical Cost

LIANG Qing-wei, SONG Baowei, JIA Yue

2006, 27(5):  865-868.  doi:10.3969/j.issn.1000-1093.2006.05.021

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The economic life of torpedo is determined by the year when the average annual cost is the lowest. And, the average annual cost relates to the purchasing cost and the use-maintenance cost. A GM(I, I) model of the grey system theory was modified by using the experience of exponential use- maintenance cost. The original data were used as accumulated sequence to set up the use-maintenance cost model that can be used to forecast the torpedo economic life. And, a Kalman sequential algorithm was adopted to weaken the randomness of the data sequence. Forecast results show that this method is satisfactory.

Verifying the Mathematics Model of submarine Magnetic Field Extrapolation with Boundary Element Method Through Experiment

GAO Jun-ji, LIU Da-ming，YAO Qiong-hui,ZHOU Guo-hua, YAN Hui

2006, 27(5):  869-872.  doi:10.3969/j.issn.1000-1093.2006.05.022

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In order to master the submarine’s magnetic field distribution in the air completely and ex?actly, and study the submarine’s magnetic-concealed performance, the mathematics model of subma?rine J s magnetic field extrapolation was built by using boundary element method. An experiment was designed to measure the magnetic field of three components on the envelope surface around the subma?rine model. The magnetic field of three components in different heights above the submarine model was obtained by using triaxial magnetometer. By comparing the metrical data with the extrapolated data, a conclusion is drawn that this model has good stability and high accuracy. This model could also reflect the submarine’ magnetic field distribution in the air exactly, and has some value in practical en?gineering .

Modeling and Analysis of Multi-Agent- based Autonomous Architecture

GUO Cheng-hao, ZHAO Yan-Ii, LIU Feng-Yu

2006, 27(5):  873-878.  doi:10.3969/j.issn.1000-1093.2006.05.023

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An autonomous computing architecture based on multi-Agent was presented, then modeled and analyzed using an extended G-net. finally, the simulated experimental results show that the archi?tecture can stabilize the performance of the system.

simulation of Laser Dri]Iing Temperature Field by Using ANSYS

SONG Lin-sen, SHI Guo-quan, LI Zhan-guo

2006, 27(5):  879-882.  doi:10.3969/j.issn.1000-1093.2006.05.024

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The machining quality of the hole is difficult to control because of the interactional complexi?ty between laser and material. A thermodynamics model was established based on tne characteristic of laser drilling and factual machining environment. The finite element software ANSYS was used to simulate the laser drilling process. The time characteristic of tne depth of the hole and its aperture, and the changing curve with laser energy were obtained to provide references for choosing the best drilling before actual drilling by the analysis of temperature field.

Experimental Techniques and Analysis

Experimental Study on Submunition Dispenser with Airbag and Nitrogen Generant

FANG Yu-jun, JIANG Jian-wei, WAN Li-zhen, MEN Jian-bing

2006, 27(5):  883-886.  doi:10.3969/j.issn.1000-1093.2006.05.025

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An experiment on a submunition dispenser with airbag and nitrogen generant was present- ea. The experiment includes three interrelated subjects. The first is about relation among dispensing velocity of submunitions, pressure in airbag and charge of nitrogen generant. The second is to investi?gate the effect of warhead architecture strength and airbag strength on the dispensing velocity. The third is to study the timing and sequencing dispensing with multi compartments. Some regular patterns were acquired. The results show that the project of the dispenser using airbag with nitrogen generant is technically feasible, and it has lower peak pressure and smaller dispensing overload than those of the dispensers with gun propellant.

Research on the Desensitization Pressure of Emulsion Explosives Sensitized by Different Sensitizing Bubble Carriers

YAN Shi-long, CHEN Dong-liang

2006, 27(5):  887-890.  doi:10.3969/j.issn.1000-1093.2006.05.026

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Substrate Temperature Dependence of the Properties 01 ZnO：Al Thin Films Prepared by Mid-frequency Sputtering

HUANG YU,XIONG-QIANG,XUE-JUNMING,MA Tie-hua，SUN Jian, ZHAO Ying，GENG Xin-hua

2006, 27(5):  891-894.  doi:10.3969/j.issn.1000-1093.2006.05.027

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The performances of ZnO: Al(ZAO) thin films are related to the substrate temperature dur?ing sputtering. The influence of substrate temperature on the performances of ZnO: Al thin films pre?pared by mid-frequency magnetron sputtering were studied using a Zn target with 2 wt% Al. The ZAO film suitable for thin film solar cells were obtained, whose thickness, resistivity, carrier concen?tration and Hall mobility are 700 nm, 4.6 X IO-4 Ω ·cm, 1.98 X IO20 cm —3 and 61.9 cm2/(V·s) re-spectively. The average optical transmittance is over 85% within visible light (400 ?800 nm).

Effect of Air/CNG Equivalence Ratio on Emissions and Performances of CNG Engine Operating on QHCCI Mode at Low Loads

SU Ling, ZHOU Long-bao, WANG Ying, JIANG De-ming, LI Wei, ZHONG Hui

2006, 27(5):  895-898.  doi:10.3969/j.issn.1000-1093.2006.05.028

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using intake throttling to change excess air/CNG ratio Фa, experimental study on the effect of excess air/CNG ratio Фa on the thermal efnciency and emissions of the CNG engine operating on quasi-homogeneous charge compression ignition (QHCCI) mode at low loads was carried out. The re?sults show that when CNG engine operates on QHCCl mode at low loads, too small Фa causes the in?crease in NOx emission and the decrease in thermal efficiency, while too large Фa leads to the increase in CO and HC emissions. HC and CO emissions are reduced remarkably by optimizing Фa.

A Machining Method on Electroplated Diamond Wire Saw with Ultrasonic Vibration

ZHANO Liaoyuan, JIA Chun-de, LU Yu-shan

2006, 27(5):  899-902.  doi:10.3969/j.issn.1000-1093.2006.05.029

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The ultrasonic vibration cutting processing of electroplated diamond wire saw for hard and brittle materials was researched. The experimental result shows that the cutting method features high removing rate, high surface quality and small crushes compared to non-ultrasonic vibration process. Tms is a new and effective method in cutting hard and brittle materials.

Comprehensive Reviews

The Development and Present status of controllable Suspension and Its Control Theory for Off-road Vehicles

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

2006, 27(5):  903-910.  doi:10.3969/j.issn.1000-1093.2006.05.030

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By using controllable suspension, the consideration for off-road vehicle is given to both on road and cross-country. Controllable suspension can be divided into body height control suspension, ac?tive suspension, semi-active suspension and slow-active suspension. For off-road vehicles, the slow-ac?tive suspension is the most appropriate. The development of control theories for controllable suspension has gone alone with the development of modern control theory, and the development trend of suspen?sion control is that two or more original control methods are integrated to become a new control method. Now, the R&D of controllable suspension for military or civilian off-road vehicle are just in experiment.

An Analysis on Some Problems in Ultra- precision Machining of Potassium Dihydrogen Phosphate Crystals

WANG Hong-xiang, WANG Jing-he, SUN Tao, ZHANG Long-jiang

2006, 27(5):  911-915.  doi:10.3969/j.issn.1000-1093.2006.05.031

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Potassium Dihydrogen Phosphate (KDP) has been found more and more important applications in the field of modern optics. KDP crystal is a non-linear optical material used for laser frequency conver?sion, it has several weak points, such as soft, brittle and deliquescent from the machining point of view. In the National Ignition Facility (NIF) research program, KDP crystal has been studied on sin?gle point diamond turning (SPDT) for getting optical surfaces. In diamond turning of highly ani?sotropic materials like KDP crystals, the depth of cut and feed is very small, the cutting behaviour, the variation of micro-cutting forces and the near-surface mechanical properties have been found to vary with the crystallographic cutting direction. However, up to now, it is hard to find some useful data on ultra-precision machining of KDP crystals. In this paper, the latest development is generally reviewed, and some problems existing in ultra-precision machining of KDP crystal have been analyzed in detail.

Short Papers

Kinematic Calibration of Center-of-mass Measurement Platform for Special Heavy Vehicle

YU Da-yong, CONG Da-cheng, HAN Jun-wei

2006, 27(5):  916-919.  doi:10.3969/j.issn.1000-1093.2006.05.032

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The structure and measuring principle of a center-of-mass measurement platform for special heavy vehicle were presented, and its kinematics model was formulated, which describs the inverse kinematics and forward kinematics. Then, a kinematic calibration method based on least square was developed, and the fourteen main Kinematic parameters of the measurement platform were calibrated using the presented method. Lastly, the calibrated results were verified by computer simulation. It lays a theoretical basis for more enhancing the measuring accuracy of center-of-mass measurement plat?form.

Research on Synthesis of Hexazaisowurzitane Derivatives

LIU Jin-quan, OU Yu-xiang

2006, 27(5):  920-923.  doi:10.3969/j.issn.1000-1093.2006.05.033

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Five derivatives of hexazaisowurzitane ( tetraacetyldipropionylhexazaisowurzitane ( TAD- PIW), tetraacetyldibutyrylhexazaisowurzitane (TADBIW), tetraacetyidiisobutyrylhexazaisowurzitane (TADzBIW )， tetrapropionyldibutyrylhexazaisowurzitane ( TPDBIW ) and tetrapropi- onyldiisobutyrylhexazaisowurzitane ( TPDtBIW )) were prepared using material tetraacetylhex- azaisowurzitane( TAIW) or tetrapropionylhexazaisowurzitane (TPIW) by acylating reations . Their structures were determined by element analysis, 1H JNMR and FTIR.

The Research on Zone of Down-signal and the Methods of Correcting in Course of Transmitting Signal of UAV

WANG Feng, ZHANG Jin, HONG Jin, LIU Chang-j in, QIAO Yan-Ii

2006, 27(5):  924-927.  doi:10.3969/j.issn.1000-1093.2006.05.034

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A zone of down-signal was found during using of a kind of UAV. The principle of the zone was analyzed in detail, and the approximate counting of the zone was done. Some methods of correct- ing the zone were brought forward.

Hardware-in-the-loop simulation of Infrared Seeker Based on Direct Signal Injection

YU Jin-song, HAO Wang-song, WAN Jiu-qing, LI Xing-shan

2006, 27(5):  928-931.  doi:10.3969/j.issn.1000-1093.2006.05.035

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A direct signal inject method for hardware-in-the-loop simulation of four-element infrared seeker was proposed. Infrared scene comprised of target, countermeasure and background signals can be directly injected into the electronic caom of seeker for verification and modification of the algorithms of tracking and arm-jamming. The architecture design of the simulation system was discussed in de?tail, and the modeling of target movement, interference missile and complex background scene was in?vestigated. The dynamic infrared scene generation techniques were studied based on the four-element infrared seeking principle. And finally the implementation of the hardware- in-the- loop simulation sys?tem was given.

Underwater Target Identification Based on the Methods of Bearing and Cross-spectrum

LIU Zhao-hui, FU Zhan-ping, WANG Ming-zhou

2006, 27(5):  932-935.  doi:10.3969/j.issn.1000-1093.2006.05.036

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A method of underwater target dimension identification was proposed by special bearing dis?tribution data of body target echo based on identification theory of a target bearing method. The esti?mating value and variance of identified submarine dimension with torpedo were given and analyzed by computer simulation at different attack conditions.

Research Notes

The Evaluation of Inherent Availability for a Truck Mounted Howitzer Systems

YU Zi-ping, QIAN Lin-fang, LIU Yi-xin

2006, 27(5):  936-939.  doi:10.3969/j.issn.1000-1093.2006.05.037

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The models of the inherent availability for single and multi truck mounted howitzer systems were established on the base of analysis of the systems. Factors affected the inherent availability of the systems were analyzed. The way and methoa for improving the inherent availability of the systems were put forward. The theory and method discussed in the paper can be taken as the foundation for the development of truck mounted howitzer systems. The case study shows that truck mounted howitzer systems have higher inherent availability in practical application and good future of the development.

The Establishment on Projectile Amounts of Cleaning and Cooling Cycle in Firearm Shooting Lifetime Tests

SHAN Yong-hai, SUN Guoji

2006, 27(5):  940-943.  doi:10.3969/j.issn.1000-1093.2006.05.038

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Cleaning and cooling occasions of firearms are the important indexes affecting their firing lifetime. The evaluating validity of firearm lifetime is dependent on the scientific and rational determi?nation of both the indexes, wmch must be based on actual combats. The projectile amounts, in the cleaning and cooling cycle of lifetime tests of all kinds of firearms were fixed on the base of the vast and systematic research for actual combats and the statistic analysis of combat examples.

Battlefield Operational Strategy of Loitering Munition

GUO Mei-fang, PAN Ning-jun, YUAN Zhi-hua

2006, 27(5):  944-947.  doi:10.3969/j.issn.1000-1093.2006.05.039

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Loitering munition can achieve optimal operational performance by optimal loitering path planning. The reconnaissance loitering search strategy of loitering munition was analyzed. It is shown from the analysis that it is the best for loitering munition to move in a straight line, and the less it turns, the better. Its searching path can be simplified in three modes that are S shape, spiral shape and to-and-fro progress shape. At the same time, it was proposed from the analysis that loitering at?tack munition can adopt the reactive and preemptive approaches for defeating the time critical targets.

The Jet Flow Field Simulations of a Rotating Attitude Control Motor

WANG Yu-fang, YANG Shu-xing

2006, 27(5):  948-952.  doi:10.3969/j.issn.1000-1093.2006.05.040

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In order to simulate the jet flow field of attitude control motor in the case of rotating, and avoid using the complex sliding mesh technique, the governing equations and the numerical boundary conditions were given in the rotating frame of reference instead of the inertial fixed, coordinates. The Renault averaged Navier-Stokes equation was employed combined with some knowledge of mechanics, and then a simple simulation example was given, which flow-fieid structure is converged easier and more similar to the practical measurement compared to that obtained with the sliding mesh technique. It can be shown that this method is feasible. Simulation results indicate that, on the condition that the figure parameter, structure parameter and gas parameter are changeless, the rocket rotation can affect the attitude control force vector and the work efficiency of attitude control motor, thereby affecting the flyight stabilization and attitude control precision of long-distance rocket. The level of rocket rotation affect mainly depends on the angle velocity of rotation.

The Effect of Tungsten Heavy Alloy Properties on Fracture Mode Under Explosive Loading

WANG Ying-chun, LIANG Jin-hui, LI Shu-kui, WANG Fu-chi

2006, 27(5):  953-955.  doi:10.3969/j.issn.1000-1093.2006.05.041

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The effect of dynamic shear and tensile strength of tungsten heavy alloys on the fracture mode of fragmentation under explosive loading was investigated. The results show that the conclusion about the synthetic effect of stress state and material properties on fracture mode of tungsten alloy frag-ments which is analyzed using the stress state theory of fracture mechanics accords with experimental results. The ratio of tensile to shear strength can express the brittleness of tungsten alloys. Under ex?plosive loading, the brittleness of tungsten alloys increases with the ratio falls, the probability of tensile fracture of fragment is increased linearly.

A Study of Storage Ability of Missile Canister Launcher in Ship-borne Ambient

QI Qiang，BI Shi-hua，QU Jun

2006, 27(5):  956-960.  doi:10.3969/j.issn.1000-1093.2006.05.042

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The analyses pointed out that the sunshine radiation heat transfer is a main reason to make a canister leaked and lost its storage ability for a missile. The time-temperature models of heat transfer in a canister body and inside canister chamber were established, and a time-pressure estimation model of a canister was also established; the time-temperature and time-pressure variation process were simulated then. Simulation results are agreed with the measurement values well. Some reasonable advices were given out to improve adaptive capacity for canister in battlefield.