Table of Content

31 March 2009, Volume 30 Issue 3

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Paper

Strategy of Deactivated Shift

XI Jun-qiang, DING Hua-rong，CHEN Hui-yan

2009, 30(3):  257-261.  doi:10.3969/j.issn.1000-1093.2009.03.001

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Disturbed shift is a common phenomenon in the automatic shift, which is harmful to the transmission and is mainly caused by the disturbed signal of the accelerator-pedal position. The reason of disturbed shift was analyzed and the strategy of deactivated shift was discussed. Consequently, the method of amending calculation on smoothing the signal of accelerator-pedal position was presented, which is finally verified by the vehicular experiment on road.

Simulation Research on Wheeled Armored Vehicle Operating Stability in Different Differential Mechanism Schemes

MENG Hong, XIANG Chang-le，SUN Xu-guang,LI Jun, JU Dong-mei

2009, 30(3):  262-267.  doi:10.3969/j.issn.1000-1093.2009.03.002

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Taking a certain wheeled armored vehicle as research object, its steady state steering perfor?mances and corresponding subjects were simulated by the established virtual prototype, the dynamic analysis software and the test specifications in GJB test standard. The influence of different differential mechanism schemes on operating stability of the vehicle was analyzed in detail. For different schemes, the operating stability of the vehicle was valued synthetically. The correctness of the simulation model and the credibility of the simulated results were verified by the comparison of the simulated results with the tested ones for corresponding subjects.

Investigation on Effect of the Lubricating-oil Temperature onto Deceleration Process of Diesel Engines

ZHANG Geng-yun, HE Lai-long, WANG Pu-kai

2009, 30(3):  268-271.  doi:10.3969/j.issn.1000-1093.2009.03.003

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The variation of no-load deceleration process curve of the diesel engine is affected by the lu?bricating-oil temperature. In order to improve the accuracy of evaluated technical condition of the diesel engine by no-load deceleration process, the general equation of calculating no-load deceleration time was proposed by normalizing no-load deceleration curve tested under various lubricating-oil tem?peratures, to improve the repeatability of the curve and reduce the absolute error of the time under the various temperatures.

Vibration Severity Monitoring and Evaluation for Armored Vehicle Transmission

FAN Xin-hai, LI Sheng-li, AN Gang,WU Dong-min, WANG Kai

2009, 30(3):  272-275.  doi:10.3969/j.issn.1000-1093.2009.03.004

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Vibration monitoring and vibration severity evaluation for armored vehicle were realized by installing additional sensors. The arithmetic of vibration severity in frequency domain was put for?ward, relative to arithmetic in time domain, which has powerful applicability for signal style and flexi?ble selectivity for frequency range, and avoids processing of signal conversion used calculus and filter?ing. An applied example was given in company with attentive proceeding and measures for improving .evaluation effect.

Digital Particle Image Velocimetry Measurement and Analysis of Velocity Distribution in Cavitating Flows Around a Hydrofoil

LI Xiang-bin, LIU Shu-yan, WANG Guoyu，ZHANG Bo, ZHANG Min-di

2009, 30(3):  276-281.  doi:10.3969/j.issn.1000-1093.2009.03.005

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The time-averaged velocity distributions in flows around a Hydronautics foil were obtained by means of a digital particle image velocimetry (DPIV) system. The measured results show that ve?locity distribution in the whole flowing field depends on development of the cavitation structures with decreasing of the cavitation numbers; the high-fluctuating region with lower velocity corresponds to the cavitation area; the lowest velocity distribution in the cavity core behaves more evenly, and be?comes smaller as moving downstream; the main-stream velocity distribution experiences such develop?ing process as the even-the fluctuant-the even gradually behind the hydrofoil; the fluid velocity distri?bution in the cavitation region, corresponding to the front of the foil’s suction surface, approaches that of the main stream region, and the fluid velocity distribution of the other cavitation region is lower, in the supprcavitation stage.

The Model and Simulation of Aerial Dispersing on Piston Dispersal Mechanism of Cluster Munition

TAO Ru-yi, WANG Hao, HUANG Bei

2009, 30(3):  282-288.  doi:10.3969/j.issn.1000-1093.2009.03.006

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The aerial dispersing interior ballistic processes and the computational method of submuni?tion exterior ballistic initial conditions of cluster munition dispersing with piston maximum travel limit were explored, ballistic models of dispersion were established and the numerical simulations were per?formed by the models. Piston maximum travel limit and influence on carrier body by reaction force were studied in the internal ballistic model. Guide tube, rotating carrier round and assembly angle of submunition were analyzed in submunition initial external ballistics model. The computational results are consistent with the practical process and the experimental data, and prove the rationality of this model. Ine theoretical methods are presented for the constructional design and dispersion analysis of piston dispersal mechanism.

Influence of Dispersing Property of Nanomaterial Mixed into Propellant on the Service Life of Gun Barrel

SONG Qiu-zhi, WANG Jian-zhong, CHEN Yong-cai，DUO Ying-xian

2009, 30(3):  289-294.  doi:10.3969/j.issn.1000-1093.2009.03.007

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A method was used to prolong service life of gun barrel by adding the nanomaterial to the propellant. Influences of the nanomaterial on the propellant were researched. Especially, dispersing property of the namomaterial influences service life of gun barrel dramatically. The propellant’s antierosion capability can be improved by adding the nanomaterial to the propellant. However, service life of gun barrel is reduced when the nanomaterial can’t be dispersed in the propellant. And service life of gun Darrel at normal temperature is prolonged dramatically when the nanomaterial is dispersed in the propellant.

Calculation and Analysis of the Time of Airstrips Blockaded by Cluster Munitions

HUANG Han-yan, WANG Zheng-ming

2009, 30(3):  295-300.  doi:10.3969/j.issn.1000-1093.2009.03.008

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The blockage probability and the blockage time are two important indexes in assessing the efficiency of airstrips blockaded by cluster munitions. Considering the minimum number of craters which needs to be repaired after encountering with attack, the region-by-region searching method and the randomly sampling method were proposed to calculate the blockage time. A minimum leave win?dow (MLW) with the minimum number of craters was found out as the region to repair, the blockage probability and the blockage time were calculated out by the two methods in which the impact points of the submunitions are generated with Monte-Carlo. An example was given to show that the two meth?ods are reasonable on the condition of adequacy simulating times and enough sampling times, and how to be chosen.

Method for Improving Ranging Accuracy of short-range Millimeter Wave Radar

WU Li, PENG Shu-sheng, XIAO Ze-long,SHI Xiang-quan

2009, 30(3):  301-305.  doi:10.3969/j.issn.1000-1093.2009.03.009

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The range-velocity ambiguity caused by the movement of a target has terriole influence on the ranging accuracy of a millimeter wave linear frequency modulated continuous wave short-range radar. A new method was presented to reduce the range-velocity ambiguity and improve the ranging accuracy by estimating parameters of the radar echo signal with fractional Fourier transform and self-correlation .And a new searching algorithm was given to increase computing speed and ranging accura?cy. Compared to Chinese remainder theorem method, the presented method is excellent for its simplici?ty and reducing the computation Durden. The simulation results prove its validity.

New Route Algorithm of Wireless Sensor Network Based on Beidou Localization System

GU Yi-zhong, SUN Ya-min, WANG Hua, WANG Gang

2009, 30(3):  306-312.  doi:10.3969/j.issn.1000-1093.2009.03.010

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Unifying the characteristic of wireless sensor network, and using the localization and com-munication functions of the China Beidou localization system, a new ant colony route optimimize algo?rithm based on the geographical position information was proposed. The orientation factor and the transfer of routing information between clusters were obtained by the algorithm to reduce the search blindness and improve the routing efficiency, simulation results indicate that the algorithm has good performances in improving convergence speed, reducing sent amount of control package and saving en?ergy spending.

Prefix Matching Binary Anti-collision Algorithm in Passive Radio Frequency Identification System

WANG Xin-feng，XIE Gui-hai，YANG Hui-min，LI Hao

2009, 30(3):  313-318.  doi:10.3969/j.issn.1000-1093.2009.03.011

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Identifying speed, average tag response times and renaoility are important indexes of weigh?ing performance of the anti-collision algorithm in passive radio frequency identification (RFID) sys?tem. A Query Tree (QT) algorithm is a famous algorithm for lowest-cost RFID tags, but its short?coming is low identifying speed and high average tag response times. A prefix matching binary algo?rithm based on the QT algorithm was proposed. It is the idea of the new algorithm that based on char?acteristic of tag ID composed by several subsections which nave different meanings, after tags ID are i- dentified, a given reader builds a prefix database on the identified tags ID; in subsequent identifying process, the reader uses the prefix database to deduce the tag ID being identified. The simulated re?sults show that identifying speed of the prefix matcnmg binary algorithm increases by four times, aver?age tag response times decrease by three fourth, system transmitting throughput increases by four times as against those of QT algorithm.

The Partially Decoupled Volterra Adaptive Chaos Prediction for Wave Hydrodynamic Pressure Signals

SHAN Zhi-chao, LIN Chun-sheng，XIANG Qian

2009, 30(3):  319-323.  doi:10.3969/j.issn.1000-1093.2009.03.012

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Taking aim at the bad prediction filtering effect on wave hydrodynamic pressure field under high oceanic condition, a novel prediction nltering method was proposed based on chaotic model. The chaos character of ocean wave hydrodynamic pressure signals was analyzed, the phase space reconstruc?tion parameters were calculated, the phase space reconstruction model of ocean wave hydrodynamic pressure signals was established; the prediction filtering was performed by chaotic feature, high order information revealed with phase trace, and a second order partially decoupled Volterra adaptive filter. A large number of experiments of predicting the practical ocean wave data and the result of detecting the ship pressure signal show that the algorithm has higher prediction filtering effect and can adjust fil?ter coefficient in time according to tne wave changing; the realization of the algorithm is simple, so the algorithm is suitable for the wave which is short time stationary.

A Guidance Law for Overhead Attacking Surface Maneuver Target

HAN Yan-hua, XU Bo

2009, 30(3):  324-328.  doi:10.3969/j.issn.1000-1093.2009.03.013

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3-D relative motion model for missile and surface maneuver target was established. Target velocity and maneuver acceleration were all treated as bounded disturbance. Guidance law proposed in the paper contains two parts those are nonlinear approach guidance law and nonlinear overhead attack guidance law. fhe former guidance law was designed based on the feedback of the pitch and azimuth rate of missile-target line of sight using input-output linearization. The later guidance law was designed based, on the feedback of missile-Target’s line of sight pitch using input-output linearization. Overhead attacking surface maneuver target was realized because the guidance law can guarantee the missile-tar?get’s line of sight pitch to reach negative ninety degree and missile-target’s line of sight angle rate to reach zero simultaneously. Stability and precision of the guidance system were analyzed theoretically. Numerical simulation result shows the effectiveness of the guidance law.

Study on Pointing Error of Seeker

WANG Jun, LU Fu-gang

2009, 30(3):  329-332.  doi:10.3969/j.issn.1000-1093.2009.03.014

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The target scanning pattern taking theoretical line of sight as center was proposed, wmch can decrease scanning angle scope and period, reduce technical index requirement for the seeker; the pointing model of the seeker was established, its error was analyzed; the error was simulated by Monte-Carlo method. The simulated results show that the scanning angle scope can decrease 2a, wich value is related to target lateral maneuver speed, missile range and adopted medium guidance law. The studied results can play a role in reference for homing missile engineering research and devel-opment.

Data Fusion Technique of IR/Passive Radar Multi-mode Guidance Seeker for Surface-to-air Anti-radiation Missile

QIN Yu-liang, YU Tao, DENG Bin,WANG Hong-qiang, LI Xiang

2009, 30(3):  333-337.  doi:10.3969/j.issn.1000-1093.2009.03.015

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Data fusion is one of the key problems and techniques for multi-pattern composite guidance seeker. On the ground of analyzing requirement of weapon system to data fusion system of the in?frared/ passive radar composite guidance seeker, the general flow of data fusion was designed; interfer?ence judgement methods of the single and multiple sensors were proposed based on differences between prediction and observation, prediction and prediction; the data fusion strategy was designed at differ?ent phases in attacking process of the missile. Effectivenesses of interference judgement and fusion strategy were verified by measured data in a real experiment.

Rsearch on SINS Error Transfer Model of Ballistic Missile

XIAN Yong, LI Gang

2009, 30(3):  338-341.  doi:10.3969/j.issn.1000-1093.2009.03.016

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The strap-down inertial navigation system (SINS) error of ballistic missile is generated by the mutual influence of gyroscope and accelerometer, and the transfer model is completely different ?from that of gimbaled INS. The discrete error transfer model was obtained through studying the ap?plied SINS error model of ballistic missile, and the discrete Kalman filtering simulation based on the model was carried out. The simulated results demonstrate that the obtained model can depict the SINS error exactly and provide advantages for integrated guidance research and improving hit accuracy re?search .

Study on the Master Inertial Navigation System Reference Data Delay Processing Method in Transfer Alignment

XIA Jia-he, QIN Yong-yuan, ZHAO Chang-shan

2009, 30(3):  342-345.  doi:10.3969/j.issn.1000-1093.2009.03.017

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A method for processing the problem resulting from master inertial navigation system (MINS) data delay in transfer alignment was presented. When the slave inertial navigation system (SINS) got the MTNS reference data, the data was processed by Kalman filtering and the time origin was unified to the moment corresponding to the MINS data; the current error estimation of the SINS was obtained by time update. Simulation results show that the transfer alignment performance is im?proved by compensating data delay; in the fast and high accuracy alignment it is necessary to take the MINS reference data delay into account.

Design of Automatic Ultrasonic Flaw Detection System for Missile Launch Canister

DUWen-zheng，HUANG Xian-xiang, XIE Jian,CHENG Hong-jie

2009, 30(3):  346-349.  doi:10.3969/j.issn.1000-1093.2009.03.018

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The launch canister is a core component of a type of missile launch vehicle, which requires flaw detection after each launch mission, to meet the high requirement of safety. To improve the effi?ciency and accuracy and to get a more vivid result display, the automatic flaw detection system e- quipped with tnree-degree-of-freedom ultrasonic scan drive device was designed. The ultrasonic signal processing method based on spatial correlation filtering and the flaw detecting result based on B-scan imaging method were aiso proposed in the system software design. The system has been used already in the maintenance missions of a type of missile launch equipment, and the good application effect is al?so shown.

Pulse Shaping Techniques for Large-diameter Split Hopkinson Pressure Bar Test

LI Wei-min, XU Jin-yu

2009, 30(3):  350-355.  doi:10.3969/j.issn.1000-1093.2009.03.019

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Carbon fiber reinforced concrete (CFRC) specimens were tested by 100 mm diameter split Hopkinson pressure bar (SHPB) apparatus. An improved method for obtaining dynamic stress equilib?rium and nearly constant strain rate loading was proposed, containing pulse shaper design, nearly con?stant strain rate estimation, the optimum average strain rate determination and dynamic stress equilib?rium analysis. The experimented results obtained from pulse shaped SHPB tests with CFRC specimens show that H62 brass pulse shapers of ?20 mm x I mm, ?22 mm x I mm, ?25 mm x I mm,?27 mm x I mm and ?30 mm X I mm can increase rise time of incident pulse by up to 100% ?160% ; one pulse shaper of a certain diameter can just offer one optimum nearly constant strain rate, and the relationship between them is approximately linear; dynamic stress nonequilibrium coefficient can describe stress equilibrium during SHPB tests effectively.

Test Analysis on Vibration signal of Tnin Aluminium- alloy Cylinder Machined with Orthogonal Turn-Milling

SHI Li, CHEN Er-tao, JIANG Zeng-hui

2009, 30(3):  356-360.  doi:10.3969/j.issn.1000-1093.2009.03.020

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The cutting test of orthogonal turn-milling thin aluminium-alloy cylinder was performed by MAZAK machine tool, piezoelectricity acceleration sensors fixed to inner wall of the cylinder, PCI- 1712 high speed data acquisition card used for acquiring vibration signals of the cylinder. The acquired acceleration signals were analyzed by MATLAB to obtain the vibration signals in time domain which sign the vibration amplitudes and their power spectral densities which display frequency structure and energy distribution. The tendency of varying self-excited frequency with rotating speed for cutter and wall thickness was analyzed, the main frequency of chatter from technology system was given in fre?quency domain ? The acute chatter signal was decomposed with wavelet packets and the node signal was reconstructed based on energy and frequency distribution of the chatter signal, to gain chatter signal fil?tered by wavelet packets. For understanding the change of turn-milling cutting force before and after acute chatter, the vibration signals of three different cutter rotating speed were decomposed and recon?structed with wavelet packets, to gain forced vibration signals. It is found by contrasting the three forced vibration signals that the forced vibration enhances at appearance of acute chatter with incre?ment of equivalent voltage of forced, vibration, which reflects the magnitude and change of turn-milling cutting force from one aspect. The above analysis of the vibration signal has guidance meaning to machining thin cylinder with orthogonal turn-milling.

A Calculation Method for Supercavity Shape Based on the Logvinovich Independence Principle of the Cavity Section Expansion

ZHANG Xue-wei, ZHANG Liang, WANG Cong, ZHANG Jia-zhong, WEI Ying-jie

2009, 30(3):  361-365.  doi:10.3969/j.issn.1000-1093.2009.03.021

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A calculation method was brought forward to calculate steady and unsteady natural and ven?tilated supercavities based on the Logvinovich principle of the cavity sections expansion. Unsteady nat?ural and ventilated supercavities disturbed with the changes of disk cavitator velocity and flowfield pressure were simulated by the method. The simulated results indicate that the shape characteristic of quasi-steady natural supercavity is distinct from that of unsteady natural supercavity, the change of un?steady supercavity length lags behind disturbances; the shape characteristic of natural supercavity is al?so distinct from that of ventilated supercavity, ventilated supercavity has longer transition time and larger oscillating amplitude than those of natural supercavity under unsteady disturbance.

Experimental Techniques and Analysis

Analysis on Near Range Millimeter Wave Synthetic Aperture Radiometer Imaging System

WANG Ben-qing，LI Xing-guo

2009, 30(3):  366-370.  doi:10.3969/j.issn.1000-1093.2009.03.022

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A near sensing millimeter wave synthetic aperture radiometer (MMW-SAR) passive imaging system was developed, which is composed of a signal processing system and two radiometers scanning along horizontal and vertical direction, to take images of the target within several meters. Uonfigura- tion and imaging algorithms of the imaging system were given in detail; it was proposed that the chief characteristic of near range imaging is phase compensation factor in imaging formula; the synthetic aperture imaging formula in the Cartesian coordinate system was deduced for the first time, to simplify arithmetic of tne expression and the phase compensation; the multiphase filtering algorithm was pro?posed m calculating the correlation function, to restrain the fluctuation ot imaginary part of the correla?tion function, and improves imaging quality and system efficiency.

Research Notes

Infrared Image Object Tracking Based on Multi-pattern Algorithm

FU Meng-yin, LIU Yi-tong

2009, 30(3):  371-374.  doi:10.3969/j.issn.1000-1093.2009.03.023

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For the infrared ground moving object in image sequence emerges diversification in the course of tracking the ooject, any single tracking pattern can not satisfy the requirement of an object tracking system. The multi-pattern tracking algorithms were adopted, in which the correlation matching algorithm based on mutual information similarity measure is used for small abject and the centroid tracking one for large one. The experimental results of two different infrared image sequences show that the algorithm has stable and precise tracking performance, shorter runtime and can fully sat?isfy real-time requirement.

Research on Ka-band Dual-polarization Direct Detection Total Power Radiometer

ZHANG Ying-hao, WU Wen

2009, 30(3):  375-379.  doi:10.3969/j.issn.1000-1093.2009.03.024

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A novel dual-polarization millimeter wave (MMW) total power radiometer was proposed, which composed of two direct detection receivers used for receiving two orthogonal polarization compo-nents of the target radiation signals, to detect and identify the target. On the basis of discussing the theory and the configuration of the system, the performance of the system was analyzed. The analysed results show that the radiometer has high temperature sensitivity, good signal-to-noise ratio and large target detection range, and can identify the false target which has different apparent temperatures at vertical and horizontal-polarized radiations.

Study on Modeling of High Accuracy Regional Geomagnetic Field Used for the Geomagnetic Navigation

YANG Yun-tao, SHI Zhi-yong, LU Jian-gang, GUAN Zhen-zhen

2009, 30(3):  380-384.  doi:10.3969/j.issn.1000-1093.2009.03.025

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From principle of the geomagnetic matching navigation, the key technical problems, which need to be solved in developing the navigation, were analyzed and proposed. Taking aim at lower pre?cision and boundary effect of the current region geomagnetic field model, the shortage of appending the IGRF data to the regional boundary was analyzed deeply. A higher precision regional geomagnetic field model suitable for geomagnetic matching navigation was established by the Taylor polynomial fitting method with boundary interpolation constraint to provide reliable reference basis for the matching algo-rithm ;the algorithm of the optima polynomial interpolation truncation order was put forward; the simulation was conducted by the model and the algorithm. The simulated results show that the tech?nology which is better than the method of appending the IGRF data obviously can improve the resolu?tion of regional geomagnetic field model and resolve the boundary effect.