Table of Content

31 January 2008, Volume 29 Issue 1

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Paper

Automatic Shift Technology for Positive Independent Mechanical Split Path Transmission

MENG Jian-min, XI Jun-qiang, CHEN Hui-yan,GONG Peng

2008, 29(1):  1-5.  doi:10.3969/j.issn.1000-1093.2008.01.001

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A self-propelled artillery is equipped with the positive independent mechanical split path transmission, which is controlled manually. In practical use, drivers usually take mistake operation at shifting which causes the excessive wear of the main clutch. As a result, the service period of the vehi?cle is shortened severely. To avoid what we mentioned early, we attached an automatic shift system which is developed for tne vehicle upgrade to the transmission to substitute the original mechanical shift system. Then, the following vehicle driving tests prove that the automatic shift system can re?solve the excessive wear of the main clutch; at the same time, the function of the automatic shift of the vehicle can be realized.

Simulation and Experiment Research on Electro Hydraulic Proportional Control for Heavy Vehicle Blend Brake System

XU Ming

2008, 29(1):  6-9.  doi:10.3969/j.issn.1000-1093.2008.01.002

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A blend brake system of heavy venicle was proposed. The main control part of the system is an electro hydraulic proportional servo valve, through the analysis oi its control property and system feature, a nonlinearable model of the brake cylinder controlled by the valve was deduced. The transfer function of the system was also obtained, and the hydraulic inherent frequency and the PID closed-loop system feature were calculated according to the selected valve feature and the systematic parameters. A PID closed-loop control system was formed. The simulated result is consistent with that tested in bench and on the site with the heavy vehicle of 50 t. The experimental data show that the proposed control method has the quality of quick response and high precision.

Co-simulation of Hybrid Power Plant of Electric Drive System for Armored Vehicles

HUANG Qian, HUANG Ying, ZHANG Fu-jun,CHEN Yin-chun

2008, 29(1):  10-14.  doi:10.3969/j.issn.1000-1093.2008.01.003

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Methodologies for modeling and simulation of hybrid power plants are a key technology dur?ing the designing period for electric drive system of armored vehicles. Though there are some simula?tion softwares of the plant, the model establishment and the simulation precision still have some de?faults. By using Simulink and Simplorer，a muti-domain model of the plant was established and co?simulation between Simulink and Simplorer was realized. The plant was primarily simulated by the model. The simulated result shows that the model can better reflect the dynamic response characteris?tic of the plant.

Application of Discretization Scheme on Confirmation of Waterline for Amphibious Vehicle

WANG Tao, XU Guoying, GUO Qi-sheng

2008, 29(1):  15-18.  doi:10.3969/j.issn.1000-1093.2008.01.004

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Based on discretizational idea, a solver was programmed for confirming position of waterline on amphibious vehicle with known distribution of material. The domain covered by venicle was divided into many cells to compute mass and tonnage through the integral thought. Center of mass, center of buoyancy and position of waterline were also resolved based on equivalent theory of dimensional vector force system and the thought of iteration approach. The program was used on one vehicle under ex?treme condition assuming homogeneous distribution of material. Comparison between computational data and measured data shows that the result is precise enough for later computation of flow field.

Methods to Ascertain the Alert Temperature of Gun Tube

CHEN Gui-dong, ZHOU Yan-huang

2008, 29(1):  19-22.  doi:10.3969/j.issn.1000-1093.2008.01.005

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The alert temperature of gun tube was calculated by method of real-time temperature and method of delay-time temperature and the two methods were compared. The influences of the fire mode and the environment temperature on the ascertainment of alert temperature were analyzed. The simulate results show that the error of alert temperature among different fire modes is larger with outer wall temperature used as criterion, and the performance of gun at other fire modes is limited for ensur?ing safe firing at a certain fire mode; the distance of 15 mm from inner wall is the best location for measuring thermocouple; tne alert temperature is 159 °C at the permissible maximum temperature of the cartridge is 170 °C in the bore.

Study of Influence Factors on Launcning Performance of Rarefaction Wave Gun

ZHANG Fan, LIAO Zhen-qiang, LIU Guo-xin, CHEN Yang

2008, 29(1):  23-27.  doi:10.3969/j.issn.1000-1093.2008.01.006

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The newly developed rarefaction wave gun (RAVEN) can achieve low recoil momentum without decreasing the muzzle velocity of the projectile by means of delayed venting the brcech. The four-stage physical model of RAVEN was put forward using quasi one- dimensional quasi two-pnase flow theory. Taking a 14.5 mm rarefaction wave test gun as the computing instance, tke influences of such parameters on recoil reduction efnciency and muzzle velocity of RAVEN were calculated and ana?lyzed, as venting time of the breech, charge mass, chamber volume, barrel length, projectile mass and length and expanding angle of the nozzle. Besides a new way of modiiying the muzzle velocity and fir?ing rate of RAVEJN was invented.

Study of Refraction and Reflection Effect Caused by Shock Wave on Laser Short-Range Detection

LI Kun, LI Ping, CHEN Hui-min, SUN Jian-qiang

2008, 29(1):  28-32.  doi:10.3969/j.issn.1000-1093.2008.01.007

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The shock wave produced by supersonic flight makes the laser wave propagation of a laser short-range detection system on the aircraft emerge the refraction causing ranging error and the reflec?tion causing the clutter. According to optical theory, an engineering algorithm ot the refraction and re?flection effects of the shock wave based on ratio of air density between front and back of the shock wave was proposed. The formulas of ranging error and clutter power caused by the effects were de?duced .The simulation and the analysis were worked out from macro view. The theoretical foundation was provided for the research of laser short-range detection.

Evaluation of Speech Quality Based on Wavelet Spectrum Distortion Measure

WANG Ji-xiang, LIU Gui-zhong，LIU Guang-jian,GAO Xiang-dong

2008, 29(1):  33-36.  doi:10.3969/j.issn.1000-1093.2008.01.008

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The evaluation of speech quality is commonly used in the communication countermeasure equipment testing. Its application to the testing is limited due to the inefficiency of existent objective evaluation method. The method of evaluating communication quality with the wavelet spectrum distor?tion measure (WSDM) was proposed after the analysis of wavelet theory and objective evaluation means. The WSDM was defined and the correspondent calculation formula was presented. The testing results show that the correlation between subjective and objective evaluations is improved by the use of the method of evaluating communication quality with WSDM compared with MFCC and BARK spec?trum distortion measure.

An MEMS Millimeter- wave Filter Design Based on 3-D Finite Element Method

YANG Huai-zhi，SUN Hou-jun, YU Wei-hua, LV Xin

2008, 29(1):  37-42.  doi:10.3969/j.issn.1000-1093.2008.01.009

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A novel design method was presented for millimeter-wave micro-electro-mechanical-systems (MEMS) filters based on FEM，which have the same results as the traditional FDTD method. More?over, an MEMS niter’s design and simple machining flow were studied, and some significantly aca?demic analyzing and engineering application were obtained. The research of this design method is help?ful and useful to the design of other millimeter-wave passive devices.

Morse Signal Decode Node Based on Ad Hoc Networks

ZHANG Dong-hong, LI Ke-jie, WU De-qiong

2008, 29(1):  43-46.  doi:10.3969/j.issn.1000-1093.2008.01.010

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Now the study of Morse signal decode is aimed at single signal source. The information can be transmitted in networks only after it is sent to PC. New decode nodes send all different signals to PC by use of ad hoc networks technology synchronously. Decode accuracy was increased by new proba?bility method used for judging code rate correctly and various error corrections. The characteristics of node are miniature, low cost, low power loss, network and visualization.

Analysis of Oil-water Mixture Using Time Domain Dielectric Spectroscopy Based on Wavelet Transform

REN Lei, WANG Tian-jing, CHEN Xiang-guang

2008, 29(1):  47-51.  doi:10.3969/j.issn.1000-1093.2008.01.011

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At present, the time domain dielectric spectroscopy (TDS) is mainly used to analyse the thin liquid or the substances composed with molecular orderly body. The various relaxation processes desired during using the method are unrelated one another or could be superposable linearly. But the application of traditional TDS is restrained for the analysis of complex heterogeneous mixture. In order to widen its scope of application, an improved method was proposed based on wavelet transform. Through the analysis of the relaxation process of oil-water mixture, the experimental results show that the time domain dielectric spectroscopy based on wavelet transform can exhibit the whole spectrum in-formation of mixture and obtain the various component information in time and frequency domains. Therefore, the TDs method based on wavelet transform can be used for analying oil-water mixture in different oil fields.

Robust Adaptive Trajectory Linearization Control for Aerospace Vehicle Using cringle Hidden Layer Neural Networks

ZHU Liang, JIANG Chang-sheng, XUE Ya-Ii

2008, 29(1):  52-56.  doi:10.3969/j.issn.1000-1093.2008.01.012

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A design scheme of an adaptive trajectory linearization control system for an aerospace vehi?cle was presented by using single hidden layer neural networks! SriLNN) . The existing uncertainties in the system were evaluated on-line by the approximation abilities of SHLNN, the effects of the un-certainties on the system performance were canceled by the neural network output. The approximation error was overcome by a robust adaptive controller to obtain a better perform of the closed-loop control system. A rigorous proof demostrates that the adaptive adjustment rules can ensure converging the sys?tem track error to an arbitrarily small neighborhood of zero. The simulation results for the aerospace vehicle show that the on-line neural network based adaptive algorithm has better response performance under the condition of hypersonic flight.

Calculation and Assessment on Damage Effect of System Target

LI Xin-qi, XIANG Ai-hong, LI Hong-xia

2008, 29(1):  57-62.  doi:10.3969/j.issn.1000-1093.2008.01.013

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Characteristic and demand of damage efficiency assessment were analysed. The method how to solve engineering application of system target damage assessment was advanced. Introducing damage tree way, we analysed the target function frame and. confirmed the key sub-target. The target system was decomposed into a series of typical targets, in which method the index of damage effect was select?ed. The quantitative relation between target physical damage and efficiency attenuation is settled by the exponent method. According to the trait of system target functional frame, the integer efficiency was gained. Damage assessment model of conventional Ballistic Missile beating was formed in the com?bat safeguard system of deck-landing aircraft for aircraft carrier.

Optimum Terminal Guidance for Air-to-Ground Missile with Impact Angle Constraint

HOU Ming-shan

2008, 29(1):  63-67.  doi:10.3969/j.issn.1000-1093.2008.01.014

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The optimum terminal guidance for long range air-to-ground missile in vertical plane with impact angle constraint was investigated. The missile reference trajectory was designed according to the impact angle requirement. Around the reference trajectory, a linear-time-variable missile-target model was established. The performance index of minimizing the tracking error and control energy was used in the design of optimum terminal guidance law, while the weighting matrices were chosen as the functions of time-to-go. The guidance law is combined by two parts such as the reference trajectory compensation term and the tracking error. The properties of miss distance, control energy requirement and impact angle error were compared with those of the guidance law in Ref. I by numerical simula?tion. TKe simulated results show that the proposed, method is better than that in Ref. 1. The proposed method has reference value for the optimum terminal guidance design of long range air-to-ground mis?sile and guided bomb unit.

Numerical Simulation for Temperature Field of a Complex Structure Rocket Propellant

LI Jie, ZHOU Yan-huang

2008, 29(1):  68-71.  doi:10.3969/j.issn.1000-1093.2008.01.015

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Simulating the temperature field of a rocket motor (including propellant) by numerical method is an effective way to get real-time temperatures of the rocket propellant. A physical model and a mathematical model for heat transfer of the researched rocket were established. Because the rocket propellant, which consists of seven columns, has a complex structure, it is impossible to calculate the calculated domain ’ s temperature field with structured grids. So triangular unstructured grids were generated m the domain and then all nodes discrete equations were deduced. The transient tempera?ture field of the domain, including propellant, was worked out by numerical method. The comparison between temperature curves, gotten by calculation and test, shows the calculation result is correct. So the transient temperature field of the complex structure propellant can be correctly simulated by the proposed method.

Grey Relation of Two Data Sequences and Its Application in Engineering

XIA Xin-tao, CHEN Xiao-yang, ZHANG Yong-zhen,WANG Zhong-yu

2008, 29(1):  72-77.  doi:10.3969/j.issn.1000-1093.2008.01.016

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It is difficult to tackle the problem about testing of attributes between two data sequences for grey relational analysis because the number of data sequences must be more than 2 in order to structure a grey relational space. For this reason, a concept, grey relation, was advanced using rationale of grey system. Started with generation of the fixed value reference sequence from mean of these two data se?quences, maximum grey difference, minimum coefficient of similarity and weighting coefficient of sys?tem attributes were defined, relational properties and theorems were given, and accordingly an especial grey relational space, viz. grey similarity space which permits the probability distribution unknown and the number of data small, was formed. On grey similarity space, a testing criterion of system at?tributes was proposed, carried with its corresponding grey confidence level. Experiments on the error coefficient of strapdown inertial measurement unit (SIMU) and the effectiveness of weapon systems show that grey relation is provided with significance at the above 95% grey confidence level.

Numerical Simulation on the Shape of Natwral Supercavity -Based on Full Three Dimensional Disk-Cavitator

HUANG Hai-long, HUANG Wen-hu, ZHOU Feng

2008, 29(1):  78-84.  doi:10.3969/j.issn.1000-1093.2008.01.017

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The homogeneous flow field was solved by N-S equations and k-ε turbulence equations and the supercavity was simulated by modified Rayleigh-Plesset equation based on the structured mesh, fhe supercavity flow of the three dimensional disk-cavitator was numerically simulated under different cavitation numbers. The research shows that the simulation result of full three-dimensional aisK-cavita- tor is consistent with the empirical formulas. The problem of numerical simulation on the supercavity induced by disk-cavitator with attack angle was solved. The shape feature of the supercavity mentioned above was analyzed in detail. The advantage and disadvantage of disk-cavitators with and without at?tack angle were summarized. The study provides the basis for shape optimization of supercavity and drag reduction.

Investigation of Numerical Method of the Vibration Response of Underground Structure

JIN Jing, SHANG Xiao-jiang, DING Hua

2008, 29(1):  85-89.  doi:10.3969/j.issn.1000-1093.2008.01.018

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With the help of rapidly developed computer technology, the numerical simulation has be?come an important research tool in simulating blasting processes in various medium and their near-field wave effects. Against one of the important application subjects of blasting technique in engineering, the vibration and response of underground structure under blasting load conditions were studied numer-ically. By analyzing an equivalent source model for the blasting vibrations of a fragmenting blasting, it may be seen that the model proposed in this paper reflects the main physical characteristics of the blast?ing vibrating processes, and it is simple and easy to implement in applications. By using the equivalent source model, vibration process of underground structure under blasting load conditions was realized in FEM for the purpose of numerical simulation. Transient disturbance and propagation characteristic, such as frequency characteristic and amplitude change rule were analyzed and compared with the exper?imental data. It explains the near-field explosion phenomenon and provides theoretical gist for experi?ments ? The numerical simulation oi m situ experiments verifies the validity of the method and provides good base for future work.

Investigation of Adducts of HNIW with DMF and DMSO

JIN Shao-hua, CHEN Shu-sen, LEI Xiang-dong

2008, 29(1):  90-93.  doi:10.3969/j.issn.1000-1093.2008.01.019

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The adducts formed between HNIW with DMF and DMSO were prepared in the solution of DMF/H2O, DMSO/H2O respectively. IR spectrum shows that the crystal forms of HNIW in the adductvS of HNIW/DMF and HNIW/DMSO are α,ε form respectively. The molar ratios of adducts of HNIW/DMF, HNIW/DMSO are both I : 2 determined by 1H NMR techniques. Data of TG-DTA shows that the thermal stabilities of the adducts of HNIW/DMF, HNIW/DMSO both decrease. DM- SO can obviously accelerate decomposition of HNIW.

Advance ot Dynamic Behavior of Ceramic Material Under the Impact of Projectile

HOU Hai-liang, ZHU Xi, KAN Yu-long

2008, 29(1):  94-99.  doi:10.3969/j.issn.1000-1093.2008.01.020

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The studies on dynamic response of ceramic under the impact of projectile were summed up briefly from respects of constitutive relation and damage model of ceramic, and the experimental stud?ies on dynamic response of ceramic including experimental techniques, strain rate effect, Hugoniot e- lastic limit ana dynamic yield strength, and the failure wave phenomena etc. The status quo of numeri?cal simulation technique was analyzed and the future trend was explored for antiimpact response char?acteristic of ceramic material.

Research on Union Search Oriented to Distributed Simulation Resource Repository

WU Ze-bin, WU Hui-zhong, LI Wei-qing, WEI Jie

2008, 29(1):  100-104.  doi:10.3969/j.issn.1000-1093.2008.01.021

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Distributed simulation resource repository needs an extensible union search platform, which can make users find particular simulation resources quickly. On the basis of analyzing typical problems of union search in distributed simulation resource repository, a framework of union searcn was designed based on web services. I aKing aim at search service distribution and result fusion, search service union model, result record metadata model Dased on XML and corresponding algorithm were proposed. The union search prototype was implemented, its performance test result was given.

Five-tuples Model Based Architecture Research of Small Robot

YANG Dan, CHENG Wei-ming, ZHAO Chun-xia, TANG Zhen-min, WANG Zhen-xing

2008, 29(1):  105-109.  doi:10.3969/j.issn.1000-1093.2008.01.022

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The small mobile robot with pedrail wheels (SMRPW) can be widely used for antiterror, clearing of blast and detecting dangerous environment at the indoor and the field. For the computing resource of SMRPW is not rich caused by the limit of its small bulk, a modeling method based on five- tuples was proposed on the basis of the characteristics of several architectures for intelligent robots. T. he architecture of SMRPW was realized by the method. The simulation experiment of SMRPW was carried out. The result shows that the SMRPW architecture system performs well in real-time re?sponse, robust and stabilization.

Comprehensive Reviews

New Generation of Inductive Setting Technology—Software Defined Inductive Setting

WANG Qiu-sheng, PAN Zong-ren，SUN Yan

2008, 29(1):  110-115.  doi:10.3969/j.issn.1000-1093.2008.01.023

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The developing history and present developing trend abroad oi inductive setting are described in brief. The features and implementation approaches of the 3rd generation oi inductive setting tech?nology software defined inductive setting (SDIS, SWIS) are described in detail. It is indicated that the SDIS is the main trend of inductive setting. Some relative techniques are also mentioned, in?cluding system universalization, serialization and modularization; system integration with fire control system; expanding information setting such as GPS data and software downloading, etc.

Short Papers

Analytic Solution for the Attitud Measurement of Aerostat V ia a Single Camera

XU Hui-gang，BO Yu-ming, GUO Zhi

2008, 29(1):  116-120.  doi:10.3969/j.issn.1000-1093.2008.01.024

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The ability of intercepting and tracking for air defense antimissile system can be effectively improved by top observation with aerostat. For providing target set data for ground weapon with aerial measurement, the high-precision measurement of the attitude of aerostat used as tracking plateform has to be solved. A novel method for the attitude measurement of aerostat via a single camera was pro?posed. It is the mechanism of the measurement that based on the set ground signal beacon and the pro?cessed signal beacon video image taken by double-focus CCD, the yaw is given by Euler angle and the roll and tne pitch are given by direction cosine relationship taking account of the sensitivity of attitude measurement with the attitude angle variation. The measurement precision was improve by various beacon informations, the estimated error is less than I milliratian. The experimental results of static precision measurement show that the method is feasible.

Research Notes

Robust H2 Filtering for a Class of Uncertain Linear Discrete-Time Systems

MA Qing-liang, HU Chang-hua

2008, 29(1):  121-125.  doi:10.3969/j.issn.1000-1093.2008.01.025

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The robust H2 filtering problem for linear discrete-time systems with polytopic uncertainty was investigated. By using linear matrix inequality (LMI) technique, a new extended H2 performance criterion for discrete-time systems was established. Based on this, a relaxed sufficient condition for the existence of robust H2 filter was derived，which provides additional degrees of design freedom. Both theory analysis and simulation results show that the proposed approach is less conservative as compared with the existing design methods.

Construction and Application of An Extended Wavelet

WANG Li-ping, DDNG Shao-jing, FU Meng-yin

2008, 29(1):  126-128.  doi:10.3969/j.issn.1000-1093.2008.01.026

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A new extended construction method of the second generation wavelet based on construction of the second wavelet was proposed. By the method, the order of the Sweldens interpolating polynomi?al was extended from odd to natural number, and the selected range of vanishing wavelet moment was extended from even to natural number. Using the extended second generation wavelet and the second wavelet, the simulation experiments of filtering the optic fiber gyro drift was carried out. The simulat-ed results show that the extended second generation wavelet can supply more wavelets and ideal appli?cation effect.