Table of Content

31 October 2008, Volume 29 Issue 10

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Paper

Numerical Computation and Analysis for Temperature Field of Track Propulsion Device of Tank

BI Xiao-ping, JIANG Lu-de, LI He-jia

2008, 29(10):  1153-1157.  doi:10.3969/j.issn.1000-1093.2008.10.001

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For grasping the temperature status of track propulsion device of tank, the mathematical model for 3-D temperature field was constructed, the FEA computation was carried out by ANSYS software to obtain the detailed temperature distributions for road wheels, drive wheels, idle wheels and track. The effects of tank speed, environment temperature, sun radiant energy, ground status and tank load on temperature of road wheels were studied, the sensitivity of road wheel temperature was analyzed. The results show that the effect of tank load on the sensitivity is most, and tne effect of ground status on it is least, rhe temperature testing system for road wheel of practical tank was devel?oped, in wmch the experiment was implemented. The computed results accord well with the experi?mental values.

Strength Analysis of Fluid Solid Interaction Field of Hydrodynamic Torque Converter Vanes

WEI Wei, YAN Qing-dong, ZHU Yan

2008, 29(10):  1158-1162.  doi:10.3969/j.issn.1000-1093.2008.10.002

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In the design process of high power density hydrodynamic torque converter, to resolve vane strength problem brought forward with the wide-range increase of rotating speed of pump wheel, a general method and its process of strength analysis of fluid solid interaction (FSI) field for hydrody?namic torque converter vanes were proposed by FSI technology and combining the flow field analysis of certain type of the vanes with its strength analysis. Accurate prediction of vane strength was realized by computational fluid dynamics and finite element analysis numerical investigation, by which stress distribution and deformation of vanes were determined, and it also provided theoretical foundation for engineering design of cascade system of high power density torque converter.

Study on Application of Neural Network Structural PID in Electro Hydraulic Injection Timing Actuator

WANG Jun, ZHANG You-tong, WANG Xian-cheng,LUO Qing-guo

2008, 29(10):  1163-1166.  doi:10.3969/j.issn.1000-1093.2008.10.003

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To meet electronic control demand of electro-hydraulic injection timing actuator for heavy duty diesel engine, application of neural network structural PID (N-PID) in the actuator was devel?oped. Work character and control demand of the actuator were analyzed, method of neural network structural PID was introduced to perform coefficient tuning of PID automatically. Closed-Ioop control for piston displacement in the actuator was performed, an un-sensitive angle of the actuator was pre?sented to compensate errors of mechanical hardware and fulfill control for injection timing. Simulation comparison between N-PID and PID under Matlab/oimulink was made, control effect of N-PID was prior to that of general PID. The bench control test of the actuator was made, its control precision and maximum response time were 0.3 (°)CA and within 2 s respectively and control effect of N-PID was superior to that of PID. The simulated and tested results show that application oi N-PID method in the actuator is available.

Research on Influence of Structure Parameters on Firing Stability of Machine Gun Based on the Virtual Prototype

CHEN Ming, MA Ji-sheng, WANG Rui-lin,LIU Bao-yuan

2008, 29(10):  1167-1171.  doi:10.3969/j.issn.1000-1093.2008.10.004

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On the basis of presenting the new concept of firing stability of machine gun, a set of metric parameters of firing stability was put forward and its influencing factors were generalized. A virtual prototype model of machine gun was established and validated by means of ADAMS. The simulated re?sults approach to the experimental ones to a certain extent, which proved the model to be creditable and correct. The influences of the structure parameters and. the boundary condition on iinng stability were obtained by the simulation. Moreover, some suggestions used for improving firing stability were given. The proposed model provides a new method for the research on firing stability of machine gun.

Wavelet Transform Modulus Maximum Denoising Method for Radio Fuze Signal Processing

LI Yue-qin, LI Ping, YAN Xiao-peng, CHEN Hui-min

2008, 29(10):  1172-1176.  doi:10.3969/j.issn.1000-1093.2008.10.005

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The theory and the method of denoising with the wavelet transform modulus maximum were aoplied to the research of the radio fuze signal processing. The spread characteristics of wavelet trans?form modulus maximum of radio fuze signal and noise in different scales were discussed based on the in-vestigation of modulus maximum characteristic. A wavelet transform modulus maximum algorithm for radio fuze denoising was presented and analyzed aeeply. The simulation results show that the method can remove the noise from radio fuze signal of low SNR effectively.

Analysis on Antinoise Performances of Pseudo-random Phase Modulation and Linear Frequency Modulation Combined Detecting System

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

2008, 29(10):  1177-1182.  doi:10.3969/j.issn.1000-1093.2008.10.006

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The principles of pseudo-random phase modulation(PM) and linear frequency modulation (LFM) combined, continuous wave (CW) pul se train detecting systems were described in brief. On tHis basis, their SNR gains (CSNR) signal processing from the back of band pass filter to the front of tne correlation detection, and the overall SNR gains (GSNR all) of the whole procedure after correlation detection were deduced in detail. The results show that I) the performance of antinoise of pseudo?random PM-LFM combined pulse system is stronger than that of pseudo-random PM-LFM combined CW system, and the o-snr and GSNR,all of the former are a and a2 times stronger than that of the lat?ter; 2) the performance of antinoise of pseudo-random PM-LFM combined CW system is as strong as that of pseudo-random PM CW system, and the performance of antinoise of pulse train pseudo-random PM-LFM combined system is as strong as that of pulse train pseudo-random PM system.

Design of the Time Sequence Drive for High Frame Rate Area Array CCD with Region- of- Interest Capability

WANG Shi-feng, ZHAO Xin, TONG Shou-feng，HAN Cheng, JIANG Hui-Iin

2008, 29(10):  1183-1187.  doi:10.3969/j.issn.1000-1093.2008.10.007

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With the developing of machine vision and the requiring of opto-electronic measuring, high?er frame rate area array CLD camera is required under many testing conditions. It is not far enough that the frame rate of the common science camera has tens of hertz mostly for the system which re?quires very high bandwidth of closed loop detection. Whether or not to rise the bandwidth of detecting link by a big margin becomes the key of the closed loop system. So the array CCD camera with region- oi-interest、ROI) was made, which only transmits available pixel signals containing the detected infor?mation, to reduce output pixel number, shorten the horizontal displacement output time and improve the frame rate of the camera. The method of the time sequence drive with ROI realized by TC237 type of area array CCD and its influence on the frame rate were studied. The studied results show that the frame rate can be improved from hundreds of hertz to thousands of one according to different sizes and positions of ROI.

A 3D Passive Infrared Ranging Algorithm Based on Bearing-Only with Monocular

FU Xiao-ning, WU De-huai

2008, 29(10):  1188-1191.  doi:10.3969/j.issn.1000-1093.2008.10.008

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An algorithm for passive ranging based on bearing-only with monocular system in 3D space was investigated. Based on the 3D movement geometrical model and the selected ground coordinate system where observation platform lies in，the relation equation between the target’s distance variation and the observer’s displacement were settled on. The piecewise linear fitting policy was adopted for high speed moving object, i.e. it is the three point collinear assumption that both the target and the observer, which are at the continuous three observing moments respectively, were in straight line moving state under the condition of a small sampling interval. The distance from the target to. the ob?server was solved by the above relation equation combined with the above assumption. The experiment with scaled-down model shows that the method is simple and feasible, its ranging relative error is less than 10 % .

Research on Collaborative Registration Algorithm for Radar System Error

WU Ze-min, REN Shu-jie, LIU Xi

2008, 29(10):  1192-1196.  doi:10.3969/j.issn.1000-1093.2008.10.009

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Affected by public target selection, target motion estimation and asynchronous time align?ment, radar system error registration algorithm is greatly constrained in application. Using the com?munication and time synchronization functions of data link network, a collaborative registration algo?rithm was proposed, which constructs a virtual coordinate system by airplane to get high precision measurement source and realize effective estimation of radar system error. The algorithm is based on Kalman filter, so the need for memory and calculation capability is not nigh. Through simulation, al?gorithm has good convergence performance, the estimation precision is good. What s more, it has no constraint on sample period, which perfectly accords with transfer principle of data link and tactical in?ternet network.

Target Tracking with Dynamic Clusters in Wireless Sensor Network

DENG Ke-bo, LIU Zhong

2008, 29(10):  1197-1202.  doi:10.3969/j.issn.1000-1093.2008.10.010

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The two key issues in target-tracking applications with dynamic clusters, i.e. cluster con-struction and target estimation, were emphatically studied. For the former issue, a voting approach was developed for the cluster head selection by taking both the node sensing information and the node power into consideration. For the latter one, a new closest point of approach(CPA) event incorporat?ing the measured signal strength was defined and a target estimation algorithm was presented. A dy?namic cluster-based target-tracking process was described, wmch contains cluster initialization, in-clus?ter data aggregation, target estimation, cluster reconstruction, target loss checkup, target recover, and so on. The simulation results show that the presented tracking system has low failure probability, long network life and high estimation accuracy.

Mathematical Analysis of Main-to-Sidelobe Ratio After the Pulse Compression in Pseudorandom Code Phase Modulation Continuous Wave Radar

CHEN Jin-li, GU Hong, SU Wei-min

2008, 29(10):  1203-1209.  doi:10.3969/j.issn.1000-1093.2008.10.011

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The relation between main-to-sidelobe ratio and Uoppler frequency after the pulse compres?sion in pseudorandom code (m-sequence) phase modulation continuous wave (CW) radar was studied, and the mathematical expression of main-to-sidelobe ratio after the pulse compression was deduced、 Since the pulse compression with the non-target range gate in m-sequence phase modulation CW radar is a “wide-band input, narrow-band outout process”，the sidelobe’s real part and imaginary part after the pulse compression approximately obey normal distribution, respectively. Thus, the peak sidelobe’s real part and imaginary part after the pulse compression were calculated. Then the mathematical ex?pression of the main-to-siaelobe ratio after the pulse compression was deduced. simulation result indi?cates that the data calculated by the mathematical expression of the main-to-sidelobe ratio is close to the data attained by the simulation at the period length of m-sequence of p ≥31.

A Method of Adaptive Noise Canceling Based on Multi-channel Differencing

MA Ling-kun, HUANG Jian-guo, XIE Da

2008, 29(10):  1210-1214.  doi:10.3969/j.issn.1000-1093.2008.10.012

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The self-generated noise of unmanned undersea vehicles (UUV) received Dy flank array is a primary influencing factor of capability of weak signal detection. In order to trail off the effect intro?duced by self-generated noise, adaptive noise cancel technique as well as physical . noise reduction method and active noise cancel methods is adopted.セor the correlation of self-generated noises collect?ed at hydrophone and accelerometer is effected by the complex production and propagation of self-gen?erated noise, the performance of the conventional method wmch utilizes the output of accelerometer near the noise source as reference signal is limited. Considering the spatial difference between targets’ signal in far-field and self-generated noise, multi-channel differencing adaptive noise canceling v MD- ANC) was proposed for adaptive noise canceling, which adopts the difference among delayed outputs of hydrophone array based on direction-of-arrival as multi-channel reference signals. Results of lake ex?periment indicate that the proposed method has better performs for noise canceling than the conven?tional method and is easy to implement; the minimum detected SNR with MD-ANC decreases by about 4 ?5 dB than that without MD-ANC; after forming wave beam, the detected SNR with MD-ANC in?creases by 3?5 dB than that.

RadjLated Noise Sources Near-field Location Based on Virtual Time Reversal Mirror

SHI Jie, YANG De-sen, LIU Bo-sheng

2008, 29(10):  1215-1219.  doi:10.3969/j.issn.1000-1093.2008.10.013

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The location of major noise source can be determined by noise source spacial distribution im?age to provide powerful basis for damping and denoismg. For radiated noise source can not be treated as point source in near-field, the locating model of line array was established by the sound image tech?nique based on focused beamforming to solve the location of non-point source. In the shallow sea, due to the influence of multi-path, the false peaks, multi peaks and high side lobe are appeared, which make the locating result seriously. The channel of non-point source target was precisely estimated and matched with the actual channel by the virtual time reversal mirror (VlRM) which can fully use the relation between the channel characteristic and the relative position of both the sources and the receiv?ing arrays. The analysis of both simulation and test data results proved the method to be valid.

Numerical Simulation of Interaction Between Supersonic Incoming Flow and Lateral Jets From Rotating Missile

WANG Shu-jun, HU Jun, WU Jia-sheng,FU Bei-bei

2008, 29(10):  1220-1226.  doi:10.3969/j.issn.1000-1093.2008.10.014

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Based on Navier-Stokes equations in rotating frame of reference, the interaction flow field over spinning body with one and two lateral jets was simulated Dy finite volume methods, symmetric TVD schemes and overlapping grid. Interference between jets and incoming flow, jets and jets, was computed. The simulated results show that two jets reinforce the interaction between jet ana incoming flow and interference exists also between two jets; the force amplification factor under the influence of two kinds of interaction is greater than that of one jet to some extent, the form of separation zone ahead of the jets is changed under the influence of rotation, at positive attack angle, rotation causes circumferential deflection of the jet plume, influences the force amplification factor.

Research on Attitude Determination Using Magnetometers and MEMS Inertial Sensors

BAO Ya-qi, CHEN Guo-guang，WU Kun,WANG Xiao-rong

2008, 29(10):  1227-1231.  doi:10.3969/j.issn.1000-1093.2008.10.015

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For correcting the trajectory correctable munition, it is necessary to acquire the real time an?gular rate and the attitude of the rocket body. A low cost scheme of the full attitude detection system composed of magnetometers and MEMS gyroscope was proposed. An algorithm used for solving the at?titude with geomagnetism measurement, gyro measurement and prior trajectory information was giv?en. A principle prototype was design and fabricated, the filter was tested by the prototype and the sin?gle-axis turntable. The tested results show that the scheme has high precision, better stability and ap?plied potential.

Calculation of Macro-tensile Strength with Two Phase Parameters for Tungsten Alloy

SONG Sun-cheng, LIU Xiaoling, SHI Hong-gang,SHANG Fu-jun

2008, 29(10):  1232-1236.  doi:10.3969/j.issn.1000-1093.2008.10.016

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Tungsten alloy is a bi-phase material composed of tungsten grain and matrix phases. The macro-tensile strength of tungsten alloy was obtained according to the shape and the volume fraction of W-phase and the mechanical parameters of the two phases by using the Eshelby equations, Mori- Tanaka concept of average stress and the incremental method which was proposed in this paper. A spe?cial tungsten alloy was analyzed and the results show that the brittleness of the tungsten alloy increases with the increment oi the amount of deformation in the metallurgy processing; the tensile failure is of first occurrence in the matrix phase of the tungsten alloy for smaller amount of deformation in the met?allurgy processing and in the W-phase of the tungsten alloy for larger amount of deformation in the metallurgy processing. The computational results for the tensile strength of the tungsten alloy are in accordance with that of experiments.

Influence of Boundary Conditions on the Stress and Displacement Distribution of Composite Energy Storage Flywheel

LI Cheng, ZHENG Yan-ping, TIE Ying

2008, 29(10):  1237-1240.  doi:10.3969/j.issn.1000-1093.2008.10.017

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For composite flywheels, different boundary conditions often have important effects on the stress and displacement distributions and are I airly related with the energy storage density. According to the character of composite and symmetrical structures, a calculation model was founded based on the nonhomogeneous anisotropic elastic theory, analytic formulas of stress and displacement for composite flywheel at working speed were given to gain radial stress, circumferential stress and radial displace?ment of arbitrary point. According to the computation models above, the influences of different dimen-sions and rotational speeds on stress and displacement field wefe simulated and the influences of differ?ent boundary conditions on radial and circumferential stresses and radial displacement for flywheel were compared.

Separation Motion'S Security of Autonomous Underwater Vehicle

LI Jia-wang, SONG Baowei, YU De-hai,SHAO Cheng, DU Xiao-xu

2008, 29(10):  1241-1245.  doi:10.3969/j.issn.1000-1093.2008.10.018

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In order to provide theoretical basis for selecting an autonomous underwater vehicle’s (AUV's) separation mode from the load’s gravity release mode and the push-thrust separation one, the separation motion’s security of AUV was analyzed quantitatively. According to the differences of interaction between load and carrier, kinetic equations of AUV，s separation motion in the two modes were derived by using multi-rigid body mechanics principle. The separation motion’s security model was proposed based on the shortest distance measurement between load and carrier after separating them thoroughly. The results show that, when load’s gravity is greater than its buoyancy, separation motion，s security increases with increasing initial separation velocity or accessional thrust force and de?creases while the set separation angle is too large or too small for the former mode; for the latter mode, the separation motion，s security is higher than that of the former mode at low initial separation velocity and strong thrust force, the high initiation velocity can lead to collision.

Research on Method of Reliability Analysis Based on System State Information

CAI Jin-yan, YU Zhi-jian, HAN Chun-hui,FENG Ji-ping

2008, 29(10):  1246-1248.  doi:10.3969/j.issn.1000-1093.2008.10.019

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It is difficult how to analyze the product reliability under the zero-failure data with the cur?rent reliability theory founded on failure data analysis. Considering that the systematic state parameters can be monitored conveniently in using the equipment, a method of reliability analysis was proposed by the equipment state information. A probability analysis model based on the parameter drift was de?duced by statistical analysis of the systematic parameter drift. Taking a concrete electronic system as an example, the practicability of the method was illustrated.

New Research Progress of Machining Technologies for Structral Ceramics Materials

YANG Jun-fei, TIAN Xin-li, WU Zhi-yuan，SHE An-ying

2008, 29(10):  1249-1255.  doi:10.3969/j.issn.1000-1093.2008.10.020

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The latest research achievements and the development of machining technologies for struc?tural ceramics materials in home and abroad were summarized, such as laser, electrical discharge ma?chining (EDM), plasma arc, ultrasonic wave, microwave and other special machining techniques, composite machining technologies, as well as interface thermal chemistry reaction machining, high?speed (super speed) grinding and electrolytic in process dressing (ELID) grinding technologies on the basis of traditional grinding technology, to provide help for developing good quality, high efficiency and low cost machining technologies in structural ceramics materials at home.

Design and Realization of an Electromagnetic Launch Measurement System

LIU Fu-cai, WANG Shi-guo, WANG Zhen-chun,LIU Yang

2008, 29(10):  1256-1261.  doi:10.3969/j.issn.1000-1093.2008.10.021

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An electromagnetic launch measurement system composed of Rogowski coil, B-dot probes, light screen target and PC-DAQ data acquisition was designed. A data processing module based on dy-namic link libraries (DLL) with a uniform interface for the second development of the system was de?veloped .The man-machine interface witn Windows character was design to provide data basis for per?formance study and technology matching of a real electromagnetic launch system. The experimental data snows that the measurement system is disturbed by peak pulse at trigger discharge and rail pulling arc; the relative error of the measurement system is 0. /% at the velocity of I km/s.

Research on a New Algorithm for Frequency Estimation Based on Multi-path Delay Structure

WANG Xin, ZHAO Chun-hui, RONG Jian-gang

2008, 29(10):  1262-1266.  doi:10.3969/j.issn.1000-1093.2008.10.022

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To consider ^he digital frequency measurement structure of multi-path delay, a MUSIC fre- quency estimation algorithm based on the multi-stage Wiener filter(MSWF) was presented. The method can get signal subspace and noise subspace quickly by using multi- decomposition of the forward recursions of the MSWF, which does not require the formation of the covariance matrix and its eigen-value decomposition, to reduce the computational complexity significantly. The novel approach can achieve such subspace estimation performance as that of the classical method. On the basis of subspace decomposition, the frequency estimation performance of MSWF-MUSIC algorithm was compared with that of MUSIC one of the classical method by the simulation. I lie simulated results show that both al?gorithms have almost the same frequency estimation accuracy; the computational amount and its com?plexity are decreased significantly to process the signal real time and easily; with the increment of SNR of snapshot, the frequency estimation mean square errors of both algorithms approach to Cramer-Rao boundary more and more.

Comprehensive Reviews

Network Structure Model of Controllable Worm Based on Tree-Net

ZHENG Kang-feng，GUO Shi-ze, YANG Yi-xian, WANG Xiu-juan

2008, 29(10):  1267-1271.  doi:10.3969/j.issn.1000-1093.2008.10.023

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Research on creaioility and security of network structure of controllable worm plays an im?portant role in internet worm prevention. A controllable worm network structure model based on tree- net was proposed, simulated and verified. The result shows that the model can syncretize the tree and net structured worm network, and balance the credibility and security of worm network efficiently.

Short Papers

Error Analysis and Modification of Coordinate Transform of Simplified Guided Bomb

WU Pan-long, BO Yu-ming, HU Rui

2008, 29(10):  1272-1276.  doi:10.3969/j.issn.1000-1093.2008.10.024

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Based on the engineering background of the simplified guided bomb, considering the guided bomb flying characteristics, the transform relations among different coordinates were investigated, the effects of various Kinds of errors on precision of coordinate transform were analyzed, a coordinate trans?form method based on target tracking was provided. The method can modify the errors, ana improve the coordinate transform precision. The simulation result shows the correctness and feasibility of the method in engineering application.

Research Notes

A Method of Cooperative Engagement Control for Attack Uninhabited Air Vehicles

SHEN Yan-hang, ZHOU Zhou

2008, 29(10):  1277-1280.  doi:10.3969/j.issn.1000-1093.2008.10.025

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The cooperative engagement control m the process of acquisition, identification and attack for attack uninhabited air vehicles (AUAVs) was explored. The cooperative search programming mod-el for multiple AUAVs was established by the “rate of return” maps on the basis of analyzing typical operation situation, utilizing search theory and probability method. The probability of correct target identification at various aspect angles was improved by the cooperative identification to the target. A false classification matrix was used to represent the probability oi incorrectly identifying nontarget as target. The numbers of killing targets and attacking false targets in cooperative and non-cooperative control strategies were simulated by different thresholds the probability of correct target identification and killing. The simulation results show that cooperative behavior significantly decreases the number of false target attack by almost 90 %，and does not improve the number of targets killed compared to non- cooperative behavior. The cooperative control allows for near optimal solution of the correlative behav?ior of a group of AUAYs in battle field, which can greatly improve the mission performance.