Table of Content

31 October 2009, Volume 30 Issue 10

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Paper

Experimental and Simulation Research of Slip-ratio During Star-up Acceleration Process ofTracked Vehicle Based on RecurDyn

LU Jin-jun, WEI Lai-sheng, ZHAO Taoshuo

2009, 30(10):  1281-1286.  doi:10.3969/j.issn.1000-1093.2009.10.001

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A multi-body dynamical model of a tracked vehicle was created based on the multi-body dy?namic software RecurDyn/ Track(HM). And the system dynamical simulation model was finished in Matlab/Simulink. The simulations of the tracked vehicle acceleration on hard and soft terrain were im-plemented respectively, and their results were analyzed and compared. The acceleration performance and the effects of slip-ratio on acceleration performance were discussed emphatically at different slip-ra?tio for the tracked vehicle. The analyzed, results were verified by a real testing of the tracked vehicle. The simulation and the experiment results can provide some theoretical reference for studying the ac-celeration characteristics and slip control of tracked vehicles.

Research on Cooling System of High Strengthened Diesel Engine Based on Heat Balance Bench Test

LUO Qing-guo, GONG Zheng-bo, FENG Jian-tao,ZHANG Zheng

2009, 30(10):  1287-1290.  doi:10.3969/j.issn.1000-1093.2009.10.002

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Based on the full condition heat balance bench test of a certain high strengthened diesel en?gine, the backwater temperature’s effects on heat losses of diesel engine body and intercooler were an?alyzed ;the high-low temperature cycles were proposed in adopted by intelligent control cooling system of the engine, of wmch the high temperature cycle is mainly used to cool diesel engine body and the low temperature cycle is used to adjust independently cooling intensity of intercooler by controlling temperature of charged air, to improve effectively comprehensive performance of the engine.

Analysis of Stability for Coning Motion of Rockets Based on Theory of Nutation Movement

YAN Xiao-yong, YANG Shu-xing, ZHANG Cheng

2009, 30(10):  1291-1296.  doi:10.3969/j.issn.1000-1093.2009.10.003

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A nonlinear mathematic model of coning motion taking nutation and precession as variable was established by the dynamic equation based on short period moment projection of the spin projec?tile, which is transformed into an analytical model by introducing generalized nutation and precession angular rate into the model. The relation of nutation and precession was analyzed, critical condition was obtained for a stable rocket based on linear model. Effects of nutation and precession on limit cycle of coning motion of the projectile were investigated, and satisfied analytical relations between nutation, precession angular rate vs. time at steady coning motion were given for the nonlinear model.

Design and Implementation of a Warhead Power Field Simulation System

CHEN Liu-tao, DING Gang-yi, JIN Qian-kun

2009, 30(10):  1297-1302.  doi:10.3969/j.issn.1000-1093.2009.10.004

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An integrated software system for numerical simulation of warhead power field simulation was proposed. In accordance with functional requirements of the power field simulation, the system architecture and the interfaces were designed, and preformed fragment and parameterized finite ele?ment modeling of the warhead were presented ? The finished system integrates several tools of finite el?ement modeling, mechanics simulation, and post-processing. The system enables collaboration of the above-mentioned tools and data integration, and calculates the spatial distribution parameters of the fragments and shock wave load of a warhead based on the numerical simulation results. The simulated results by instance show that the system can satisfy the requirement of designers.

Moving-Target-Detection Algorithm with Compensation for Doppler Migration Based on FRFT

DENG Bing, TAO Ran, PING Dian-fa, MALu

2009, 30(10):  1303-1309.  doi:10.3969/j.issn.1000-1093.2009.10.005

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A novel moving-target-detection method with compensation for quadratic phase Doppler mi?gration was proposed based on the fractional Fourier transform (FRFT) . The compensation and the coherent integration in each detection cell were realized by the frequency sweep filter bank formed with the discrete FRFT to increase the ability of detecting weak moving targets effectively in the back?ground of clutter. The simulated results show that the proposed method is effective. Since the efficient fast digital algorithm of FRFT, which has approximate computation complexity to classical FFT, was proposed, the computation cost brought by this method is poor.

An Autonomous Guidance Approach of UAV Under Dynamic Environment

PENG Jian-liang, SUN Xiu-xia, ZHU Fan,CAI Man-yi

2009, 30(10):  1310-1314.  doi:10.3969/j.issn.1000-1093.2009.10.006

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An autonomous prediction guidance approach of unmanned aerial venicle (UAV) under the dynamic and uncertain environment was presented. In consideration of sensor range and kinematics of UAV, a partition autonomous guidance model and a trajectory command solution model were con?structed ;an evaluation function was designed; taking complexity of the algorithm inter account the tra?jectory command was solved by the command quantification and particle swarm optimization (PSO) al?gorithm ;selections of the parameters of the model were discussed. The simulated results show that the approach can guide the UAV autonomously to get close to the target as fast as possiole and avoid the threats sensed by the UAV simultaneously, is executed real time and easy to be realized.

Instantaneous Frequency Estimation Based on Adaptive Time-Frequency Distribution

WANG Jun, LI Ran-wei, DU Shuan-ping

2009, 30(10):  1315-1319.  doi:10.3969/j.issn.1000-1093.2009.10.007

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An instantaneous frequency estimation based on adaptive optimal kernel time-frequency dis?tribution and a modified algorithm are proposed in order to enhance the instantaneous frequency esti?mation of multicomponent signal in noise environment. In the computation of modified algorithm, a new adaptive time-frequency distribution based on Gabor transform and Wigner-Ville distribution is obtained. Simulation and real data analysis show that the modified algorithm has the properties of low variance and calculational complexity.

Analysis on Optic-Electric Tracking System with Angle Velocity Measurement

CHEN Li, QI Guo-qing, SHENG An-dong

2009, 30(10):  1320-1326.  doi:10.3969/j.issn.1000-1093.2009.10.008

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Target tracking performance is hardly improved in traditional optic-electric tracking system with position measurements of spherical coordinates under the conaition that all of prior information is fully utilized. Angle velocity measurements of elevation and azimuth are innovatively introduced into the system. A new measurement model was presented by using design idea of extended kalman filter (EKF) for the tracking system and the asymptotic property of tracking biases was analyzed in threoy. Sequential processing of position measurements and angle velocity measurements can be conveniently implemented m engineering. The simulated results show that adding angle velocity measurements speed up convergence rate of the system, decrease root mean square of estimate error, and improve tracking performance of the system significantly.

Research on Blind NBI Suppression in CDMA by Improved Predictive Qxie-aided Technique

YIN Fu-lian, GUO Li-li, LU Man-hong

2009, 30(10):  1327-1333.  doi:10.3969/j.issn.1000-1093.2009.10.009

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To solve the problem of various narrow-band interference (NBI) rejection in code division multiple access (CDMA) system, such as autoregressive (AR) process, sinusoidal tones and digital NBI，two improved blind predictive code-aided techniques were proposed based on traditional serial- least mean square predictive-least mean square code-aided (S-LMS-LMS) . When requiring exigent real time disposal, the blind parallel-LMS predictive-LMS code-aided (P-LMS-LMS) technique was pro?posed to achieve high speed filter with changing serial predictive model and code-aided model to parallel configuration; when requiring nigh performance, the blind serial-LMS predictive-RLS code-aided (S- LMS-RLS) technique was proposed by replacing LMS code-aided model with recursive least square (RLS) code-aided model to achieve faster convergence speed and lower average consumer mean square error. The validity of the improved techniques is shown through simulations.

A New Surface Charge Method Used for Calculating Three Dimensional Potential Distribution

ZHANG Zhi-quan, ZHANG Yi-fei, ZHOU Li-wei

2009, 30(10):  1334-1338.  doi:10.3969/j.issn.1000-1093.2009.10.010

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In calculation of potential in electrostatic lens based on surface charge method, conventional methods using constant, linear and quadratic function can not describe the distribution of charge densi?ty on singular geometry accurately where the quality of electrostatic lens imaging is influenced largely by the precision of charge here. In order to solve the problem above, the new singular shape functions describing the distrioution of charge density was proposed, based on the character of charge density on singular geometry according with the asymptotic trait, through incorporating singular terms into con-ventional singular shape functions. The calculated results on unit disc iand double cylinder with singular geometry indicate that the improved method is more precise than the tradition one, which proves the method to be valid and feasible.

Control Attitude Angular Velocity for High-rolling Projectile by Moving-Mass Framework

LI Yong-bo, GUOZhi

2009, 30(10):  1339-1343.  doi:10.3969/j.issn.1000-1093.2009.10.011

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The definitions of dynamic and static equations with the moving-mass framework for high- rolling projectile were proposed; the dynamic gesture equation was established Dased on a bi-moving mass model, which is abbreviated by linearization method; the abbreviated equation was described as the standard state space form, the feedback control law was designed according to satisfactory control theory, to reach control tracking the angle velocities at yaw and pitch rotation directions; the tracking angular velocity for high-spin projectile with moving-mass framework was simulated. The simulated result shows the proposed algorithm is effective and provides a necessary reference for practical engi?neering .

Evaluation of Damage Valid Value of Underwater Target Detonated by Small Charge

ZHANG Zhi-hua, ZHONG Qiang-hui, LI Qing-min

2009, 30(10):  1344-1348.  doi:10.3969/j.issn.1000-1093.2009.10.012

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In the underwater small charge detonation experiment of a certain underwater target, major influence factors on experiment efficiency and damage parameters were analyzed, the validity problem of underwater target damage caused by underwater detonation was analyzed quantificationally with dis-criminatory analysis method, underwater target ’ s damage curve was given, which can reflect well valid damage distances of underwater target detonated by small charge.

SHPB Dynamic Compression Test of Al2O3 Ceramics Under Constant Strain Rates

WANG Cui-yi, WANG Yang-wei, YU Xiao-dong, WANG Quan-sheng, KANG Xiao-peng

2009, 30(10):  1349-1352.  doi:10.3969/j.issn.1000-1093.2009.10.013

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Split Hopkinson pressure bar (SHPB) dynamic compression tests were conducted for AI2O3 ceramics by employing the novel pulse shaping technique. Expected incident pulse was obtained through reasonable design of the pulse shaper size and the initial velocity of striker bar. It is shown that the pulse shaping technique is fairly available to study the dynamic behavior of brittle materials un?der the condition of constant strain rates; and such technique combined with direct measurement of sample strain can be usea to measure stress-strain curve of mgh-strengtn brittle materials correctly un?der the condition of high strain rates.

Analysis on the Elastic-plastic Deformation During Tube-bending Process

E Da-xin, NING Ru-xin, GU Tao

2009, 30(10):  1353-1356.  doi:10.3969/j.issn.1000-1093.2009.10.014

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The deformation during tube-bending process was analyzed on the basis of the basic hy?potheses and the model of linear strain-strengthening material. The analyzed results show that there is a small elastic area in the both sides of the symmetric axis of tube cross-section perpendicular to the bending plane, wmch can influence the spring-back of the bending unloading in some degree; Dending tangential stress increase with the decreases of the relative bending radius, the increases of yield strength and elastic modulus; when the value of the relative bending radius is in a low level, the tan?gential stress tends to increase sharply; according to the value of the bending tangential stress being lower than the one of tension limit, the formula of the minimum relative bending radius can be de?duced, in which altnough the theory-calculated value is a little bit lower than that of experiment, it can be applied to production after modification and improvement.

An Object-Group Threat Assessment Method Based on Attribute Significance of Multi-Field Expert Systems

HUANG Da-rong, GUO An-xue, LI Yun-sheng,XU Hong-bing，HUO Yong-mou

2009, 30(10):  1357-1362.  doi:10.3969/j.issn.1000-1093.2009.10.015

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A new method of threat assessment to object-group was researched by combining computer network with integrated technology of experts’ database. The attribute significance model of experts’ database was presented by combining integrated system of multi-field experts and assignment rule of threat degree of object-group with statistical method and historical database; the network evaluation system used for evaluating object-group threat was constructed by the proposed operation rule of the system combined with multi-fieid experts knowledge intergrated technology; the simulation used for e- valuating object-group threat was performed by a certain type gun-missile intergrated air defense sys?tem ? The simulated results show that the evaluation method has better updating capability and applied prospect.

Preparation of Ultra-fine Oxygen-deficient Fe3O4-δ Powder and Its Decomposition of SO2 into Sulfur

ZHAO Zhuo, ZHAO Bo-yuan, SHEN Yi-ping,ZHOU Jun-bo

2009, 30(10):  1363-1367.  doi:10.3969/j.issn.1000-1093.2009.10.016

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The oxygen-deiicient Fe3〇4—δ.was prepared by reducing the natural magnetite powder at the different temperatures using CO as reduction agent, and its catalytic activity was tested by decompos?ing SO2 into S(0). The Fe3〇4—δ sample was prepared by grinding the magnetite with wet ball-milling for 500 h, and characterized by means of SEM and XRD. The activity of decomposing SO2 with Fe3〇4—δ was monitered by pressure variation of the reaction gas system. The investigated results show that the activity of decomposing S02 appears as a single peak law in the tested temperature range; the prepared Fe3〇4—δ，at the CO flow rate of 40 mL/min, the reaction temperature of 673 K, the reduc?tion time of 6 h, has the highest activity in decomposing SO2 into S(0)，1.e. the magnetite of I g in weight can decompose SO2 of 196 mg into S(0).

The Application of Ensemble Support Vector Machine to Fault Diagnosis of Diesel Engine Based onAdaBoost Algorithm

WANG Zi-ying, QIU Mian-hao, AN Gang,WANG Kai

2009, 30(10):  1368-1374.  doi:10.3969/j.issn.1000-1093.2009.10.017

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When mechanical fault is diagnosed by support vector machine (SVM), the classification ef?fect is closely related to the kernel function. As selecting of the kernel function always lacks theoretical guidance, and approximate computation is adopted in learning course, it led to that the classification result is far from being the expected level. The eigenvector was constructed by mutual information and even amplitude indexes; a series of basic SVM was got by AdaBoost; the ensemble SVM was got by screening the basic SVM with rule of diversity, and weighting the basic SVM which satisfied the di?versity requirement. After the ensemble SVM is put into fault diagnosis of diesel engine of tank, the e- valuation of performance and classification results denote that the ensemble SVM has better classifica?tion performance and a higher classification success rate than single SVM.

Research Notes

Method of Model Reference Adaptive Control for Tank Gun Control System Based on ESO Filter

FENG Liang, MA Xiao-jun，LI Hua

2009, 30(10):  1375-1381.  doi:10.3969/j.issn.1000-1093.2009.10.018

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The tank gun control system is one uncertain and nonlinear system. A new method of model reference adaptive control for the system which contains crawl and vibration phenomena at a very low speed based on extended state observer(KSO) filter was presented by theory of the filter and hy-perstability .Matherratic model of the system was studied with the defined basic hypotheses. ESO nl- ter ana model reference adaptive controller were designed, the stability was proved; simulating was performed by a real example. The simulated results snow that the method eliminates influence of un-modeled dynamics and environmental disturbance on the system, enhances celerity of the system, solves crawl phenomenon at extremely low speed, improves steady-state performance, and provides a realistic new technique for the design of the system.

Analysis on the Hit Probability of Distributed Digital Antiaircraft System

LIU Rui, LI Yin-ya, SHENG An-dong

2009, 30(10):  1382-1388.  doi:10.3969/j.issn.1000-1093.2009.10.019

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For a distributed antiaircraft system has new changes after the digital transformation, the distributed digital antiaircraft system (DDAS) hit probability was studied. The shooting error and the target location error were analyzed. Under the assumption that target projection is a circular area in the forecast plane, the hit probability theoretical formulas of a traditional parallel firing system without baseline amendment and a digital firing system with baseline amendment were presented respectively. Theoretical analyses show that under the same conditions, the hit probability of the latter is higher than that of the former;the baseline distance of the latter has an influence only on shape of the projec?tile dispersion, but has no remarkable influence on the entire hit probability; influence of the hit point error caused by the reasonable error of baseline distance on the entire hit probability is finite. The hit probability of a burst of N projectiles for single antiaircraft in theoretical analysis was calculated by the Monte-Carlo simulation.

Research on Design of Miniaturization Integration Test System for Communication Radio

SHAO Huai-zong, YUAN Xiang-jing, WU Ying,PENG Qi-cong

2009, 30(10):  1389-1395.  doi:10.3969/j.issn.1000-1093.2009.10.020

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The design scheme of a miniaturization integration test system for communication radio based on the ideal of software defined radio (SDR), and its key parts design were proposed, which has many advantages such as its miniaturization, easy upgrade and reconfiguration and so on. rhe system, with frequency scope of 100 kHz?3 GHz, can be used as spectrum analyzer, power meter, cymome?ter, modulation index analyzer and single audio frequency signal analyzer, for monitoring wireless spectrum and providing a measure equipment to maintain all kinas of radios.

Kalman Filter Design for Target Tracking in Microwave Rendezvous and Docking Radar

ZHU Xin-guo, CUI Wei

2009, 30(10):  1396-1400.  doi:10.3969/j.issn.1000-1093.2009.10.021

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For tracking target aerocraft in microwave rendezvous ana docking radar, radial distance and velocity in spherical coordinate system were tracked jointly by a 3rd order improved Kalman filter ele?vation and elevation rate, azimuth and azimuth rate were tracked by two identical 2nd order improved Kalman niters respectively. The paramter design of state noise in the application of Kalman filtering to the tracking was solved effectively by a proposed real-time estimating algorithm ? The simulated results show that the proposed Kalman filter can accurately track target aerocraft, and has strong adaptation to target’s dynamic.

The Bayes Reliability Evaluation Method Based on AMSAA Model for Torpedo System

MAO Zhao-yong, SONG Bao-wei, HU Hai-bao,ZHENG Ke

2009, 30(10):  1401-1404.  doi:10.3969/j.issn.1000-1093.2009.10.022

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The Bayesian method was adopted as an important and suitable approach to the reliability analysis and evaluation for torpedo system, because of its complexity and small sample tests. The relia?bility growth Bayesian method for the model of army material system analysis activity (AMSAA) was proposed, which can obtain the prior distribution based on the test information of reliability growth, combined with the small sample experiment data, the reliability evaluation was calculated by Bayesian method. The simulated result by an example shows that the method proposed is effective, and provides a new method for evaluating reliability of torpedo system.

A Particle Filter Algorithm in the Presence of Missing Measurements for a Nonlinear System

LI Xiong-jie, ZHOU Dong-hua

2009, 30(10):  1405-1408.  doi:10.3969/j.issn.1000-1093.2009.10.023

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Aimed, at the case that sensor data may be missing randomly in practice, a filtering approach was proposed for the nonlinear systems, which applies a particle filter based on sequential importance sampling to the on-line state estimation of non-Gauss and nonlinear systems. The missing sensor data were described as a binary switching sequence which satisfies a certain conditional probability distribu?tion ;a particle filter algorithm in the presence of missing sensor data was designed based on likelihood function; the state estimation of a upside-down pendulum system was simulated by the proposed ap?proach .The simulated results show the effectiveness of the proposed algorithm.