Table of Content

30 December 2006, Volume 27 Issue 6

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Paper

Analysis of Fault Stochastic Process for Armored Vehicles

XAN Shu-ping, YUAN Hong-tao, HAN Lu-liang

2006, 27(6):  961-964.  doi:10.3969/j.issn.1000-1093.2006.06.001

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To design a reasonable repair schedule of the armoured vehicles, fault stochastic process hap?pening in an overhaul repair interval was discussed. Relying on three assumptions, fault stochastic pro?cess and fault intensity function were modelled by general Poisson process and exponential polynomial respectively. A method of estimating unknown parameters and orders of the model was further pre?sented. Both the model and the method provide the theory basis and feasible approach of parameter es?timation for the arrangement of the repair timetable of the armoured vehicles.

Analysis on the Vibration Control of Tracked Vehicle Suspension System Using Magnetorheological Fluid Damper

ZHANG Jin-qiu，LU Nian-Ii

2006, 27(6):  965-969.  doi:10.3969/j.issn.1000-1093.2006.06.002

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A simulation analysis of the semi-active control of tracked vehicle suspension system was giv?en using magnetorheological fluid dampers. After formulating the equations of motion for suspension system considering two degrees of freedom, the control effectiveness of full state feedback controf' of LQR was calculated with the input of six measured road surface excitations. Simulation of semi-active control utilizing magnetorheological fluid damper with limited optimal Hrovat control algorithm and the semi-active control strategies proposed was carried out, and the results of the two control methods were compared. T. he effectiveness of semi-active control force tracking active control force was conducted and the analysis of active force was given, showing why semi-active control can replace active control. Simulation results show that magnetorheological fluid damper in the semi-active vibration control of suspension system of tracked vehicle is feasible.

A Simulation Study on Ride Comfort of a Self- propelled Gun Based on Virtual Prototype

WU Da-lin, MA Ji-sheng, CAI Shu-xin,ZHANG Ya-ou

2006, 27(6):  970-973.  doi:10.3969/j.issn.1000-1093.2006.06.003

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Based on the computer simulation technology, the virtual prototype of a self-propelled gun was built, and its ride comfort was analyzed. Firstly, after analyzing the structural constitution of the self-propelled gun, its virtual prototype was built by means of Al V toolbox of ADaMS. Secondly, the method of superposition of the harmonic wave was used to build the random rough road, and the ride simulation of the self-propelled gun was carried out. Finally, the total acceleration weighted RMS val?ue method was chosen as the evaluation criterion of the ride comfort of a tracked vehicle, and the refer?ence value to evaluate ride comfort was obtained by simulating riding in different roads. The simulation result indicates that the virtual prototype technology is a feasible approach to analyze the ride comfort of the self-propelled gun, and the ride comfort simulation can offer a valuable reference for the ride testing simulation of a self-propelled gun.

Dynamir Overall Parameter Optimization of Howitzer with Genetic Algorithm

CAI Wen-yong, MA Fu-qiu, YANG Guo-Lai

2006, 27(6):  974-977.  doi:10.3969/j.issn.1000-1093.2006.06.004

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In order to improve precision of the howitzer and look for the optimal overall parameter, dy?namic optimization of howitzer was carried through by combining ADAMS software and niche genetic algorithm ? The simulated results for a certain howitzer show that the muzzle disturbance can obviously be reduced after optimized; niche genetic algorithm can search out several effective schemes to favour the flexibility of general layout for the howitzer.

the Mechanical Mechanism Study on Prolonging Life of Chromium- plated Gun Bore Through Laser Discrete Pretreatment

ZHANG Guo-xiang, CHEN Guang-nan, ZHANG Kun,LUO Geng-xing, LI Huai xue

2006, 27(6):  978-983.  doi:10.3969/j.issn.1000-1093.2006.06.005

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The range experimental sample of gun bore was analyzed, whose substrate was periodically and straggly pre-treated by laser and the interface crack growth in the coating/substrate structure was theoretically studied. The results show that the mechanical mechanism of prolonging life of chromium- plated gun bore can be described as the following three points ：(a) The surface net of main crack ap?pearing randomly on the homogeneous substrate is changed into the strip pattern of main crack, which corresponds with the laser pretreatment, so that the dimension of Cr-plated “island” is increased; (b) The increase of interval between the main cracks prolongs the extending distance of interfacial crack; (c) When the interfacial crack propagates from original zone to laser processed zone, the latter can re?duce crack driving force.

A Study on the Projectile-barrel Coupling Based on Contact Model

LIu Lei, CHEN Yun-sheng, YANG Guo-ai

2006, 27(6):  984-987.  doi:10.3969/j.issn.1000-1093.2006.06.006

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A dynamic model for the projectile-barrel coupling was established based on the theory of contact. The barrel was divided into some rigid segments, which are linked by massless beams at the center of mass. Forces and moments were calculated based on the beam theory of Timoshenko. The contacts of band witn rifle and of foreside with rifle and the action of rifle torsion on band were consid?ered. Under the above-mentioned conditions, the motion of projectile in the bore was simulated by nu?merical method. The results show that the dynamic model can reflect the dynamic behavior of the pro?jectile moving in the barrel and be used to investigate the projectile-barrel coupling problem.

Application of Bayesian Networks to Safety Assessment in Pyrotechnics Systems

ZHENG Heng, WU Qi-zong, WANO Pei-lan, SHI Ai-fen

2006, 27(6):  988-993.  doi:10.3969/j.issn.1000-1093.2006.06.007

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A Bayesian network (BN) approach for safety assessment in pyrotechnics production sys?tems was presented. Bayesian networks have two advantages in contrast with the fault tree analysis (FTA). Firstly, in the modeling process, BN breaks through some hypotheses in FTA so as to do some important tnings that cannot be done in FTA，including taking the multi-state variables into ac?count, considering the correlation among the variables, and representing the uncertainty relations among the variables in better form than that of logic gate. Secondly, in the analyzing process, BN can perform the forward inference (prediction) as well as backward inference (diagnosis) . It can also find out the most probable mode causing the system failure. Adopting the Bayes Net Toolbox (BNT) soft?ware based on Matlab, the modeling and analyzing process is greatly facilitated. Finally, an example on industrial detonator production line illustrates that the BN approach is a good substitute for FTA for safety assessment in pyrotechnics production systems.

A Research on the Property of Expanded Graphite Interfering 8 mm Wave

REN Hui, JIAO Qing-jie, CUI Qing-zhong

2006, 27(6):  994-997.  doi:10.3969/j.issn.1000-1093.2006.06.008

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The property of expanded graphite interfering 8 mm wave was studied. The result indicates that expanded scale is the most important parameter to affect shielding effect. According to incidence light loss mechanism of millimeter wave radar, particle size and tmckness of expandable graphite were determined. With scanning electron microscope (SEM)，the surface figures of samples were observed. Taking H2SO4—CH3COOH—GIC as an example, the granularity, fall rate and attenuation of aerosol material was calculated and tested. Moreover, effects of expanded temperature, time on expanded multiplication rate were discussed. The results show that expanded graphite is a kind of new, effective smoke material which can interfere military millimeter wave radar at frequency of 36 GHZ.

A New Method of Measuring the Alternating Electric Field of Ships in Lossy Medium

CHEN Cong, ZHOU Jun, GONG Shen-guang

2006, 27(6):  998-1001.  doi:10.3969/j.issn.1000-1093.2006.06.009

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A new method to measure the alternating electric field of ships in lossy medium based on the principle of electromagnctic induction was put forward. The electric field component of the electromag?netic wave from ships was derived by the magnetic component measured with induction coil. The in?fluence of the self-induction, the equivalent resistance of the outer testing circuit on the output voltage of the induction coil and the frequency response were calculated. The calculated results show that the higher sensitivity than that of traditional eledrode pair will be reached so long as the coil and the testing circuit are designed reasonably. At last, the electric field of a pair of electrode in seawater was mea- surea m laboratory, and the result verified the validity of this method.

Dynamic Encryption TTechnology Applications in Ad-hoc Networks

WANG Shun-man, TAO Ran, WANG Yue，XUXie

2006, 27(6):  1002-1006.  doi:10.3969/j.issn.1000-1093.2006.06.010

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A new dynamic encryption application in Ad-hoc networks was proposed. The advantages of the method are as follows ： the previous ciphertext can be used as a seed of the new encryption process, encryption process takes effect in all the communication process by continuous dynamic key generation and synchronization, it also decreases the system bandage to a great degree, which is valuable to the Ad-hoc circumstance. Test results verified the rationality and effectiveness of the novel encryption method.

A Research on Absorptive Coaxial Cavity Resonator Microwave Amplitude Equalizer

YANG Ming-shan, ZHANG De-wei, ZHOU Dong-fang, NIU Zhong-xia

2006, 27(6):  1007-1010.  doi:10.3969/j.issn.1000-1093.2006.06.011

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The microwave amplitude equalizer is composed of several interconnected substructures, ev?ery one of which is the λ/4 absorptive coaxial cavity resonator. The resonant frequency and power at?tenuation can be changed with the length of the cavity, the depth of the probe and the micro-adjustable screw. The design of microwave equalizer involves the determination of dimensions of the cavity and the probe, location of the micro-adjustable screw, number of substructures, materials of every part, based on the comprehensive consideration of resonant frequency, power attenuation, power capacity, suppression of the high mode, impedance matching and frequency shift to temperature, etc. Tuning e- qualizer is one of most vital steps in ensuring equalizer performance. Several tuning technologies were used to ensure that the actual attenuation curve accordes with the target attenuation curve, the equaliz?er has low insert loss and good matching with input and output terminals, and its character changed slightly with temperature should also be considered at same time.

Infrared Image Edge Detection Based on Percentile Morphological Transformation

CHI Jian-nan, DONG Hui-ying, ZHANG Shi,XU Xin-he，ZHANG Zhao-hui

2006, 27(6):  1011-1014.  doi:10.3969/j.issn.1000-1093.2006.06.012

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A new method of infrared image edge detection based on image morphology was put forward aiming at the shortages of infrared image such as low contrast, blurred edges, serious noise and strong?ly spatial correlation. A parallel multiplex order morphological transformation-based algorithm was usea for infrared image enhancement, edge sharpening and filtering. To extract edge and restrain noise of infrared image efficiently, morphology operators were constructed on the basis of the concept and the properties correlating to percentile morphology filtering. The experiment results show that the method presented is more effective than classical edge detection operators for overcoming the defects of infrared image and retaining details of image edge.

Study on Active Control of Sound Radiation From a Baffle in Sonar Equipment

LU Yong-gui, WEI Yan-ding, CHEN Ding-zhong,SHEN Guo-qiang

2006, 27(6):  1015-1018.  doi:10.3969/j.issn.1000-1093.2006.06.013

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In order to control sound radiation from a baffle in sonar equipment excited by vibration and noise from a ship, the baffle was modeled as a simply supported rectangular thin plate and its radiation characteristics were analytically investigated. Piezoelectric elements were bonded on the plate as actua?tors ana the input voltage of each actuator was determined by the velocity of its position and volume ve?locity of the plate was made zero, through which the sound radiation from the plate could be con?trolled. Numerical simulations were performed and results show that significant attenuation of radiated acoustic power can be obtained, and sound radiation cancellation performance becomes better in low and medium frequencies.

Reconstruction Algorithm for the Circular Orbit Cone-beam Scan 3D-CT with Line-focus Source

PU Jian, LU Hong-nian，GONGLei

2006, 27(6):  1019-1022.  doi:10.3969/j.issn.1000-1093.2006.06.014

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FDK three-dimensional computed tomography (3D-CT) reconstruction algorithm for the circular orbit cone-beam scan with the point-shaped X-ray source is more widely accepted when com?pared with other types. It has hign reconstruction speed and accuracy within cone-beam angle of 10°. However, this algorithm does not apply for circular orbit cone-beam scan with line-focus X-ray source. So the FDK approximation principle of the point-focus X-ray source is extended to line-focus X-ray sources. An algorithm for the reconstruction of circular orbit cone-beam scan to the line-focus X-ray source was deduced. Computer simulation results prove tne validity of the algorithm. Using the exper?imental data of circular orbit cone-beam large-field-of-view scan, the reconstruction algorithm creates the right images.

Direction of Arrival Estimation Using a Uniform Line Array of Two- component Vector Hydrophones

DENG Da-xin, DENG Da-bi，Huang Bin,LIN Chun-sheng, GONG Shen-guang

2006, 27(6):  1023-1026.  doi:10.3969/j.issn.1000-1093.2006.06.015

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To reduce the traditional array size of four-component vector hydrophones and redundant components, a new direction of arrival (DOA) estimation method was proposed using a uniform line array of two-component vector hydrophones. Each vector hydrophone is composed of one velocity hy-drophone plus another co-located pressure hydrophone. The pressure hydrophone array manifold can be divided into two subarray manifolds, which constitute a rotation pair, and the rotational invariant fac?tors comprise the source’s direction cosine. The velocity hydrophone array manifold can also be divided into two subarray manifolds, which constitute a rotation pair with the pressure hydrophone array man?ifold, and the rotational invariant factors comprise the source’s other direction cosine. Based on ES- PRIT，a parallel TLS matrix pencil method is devised to estimate accurately and pair automatically in?variant factors, then determine direction of arrival. The Monte-Carlo simulation results verify its effi?ciency .

Super- resolved Image Restoration with Edge- preserving Regularization

ZHOU Hong-chao, WANG Zheng-ming, LIU Yang

2006, 27(6):  1027-1030.  doi:10.3969/j.issn.1000-1093.2006.06.016

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Super-resolved image restoration technique from a single image was studied by edge-preserv?ing regularization. The prior knowledge of piecewise continuity, finite support and space invariability of the degraded operator were effectively exploited and utilized. The objective function was constructed and the fast iterative algorithm was designed by the thought of the piecewise univariant function-fitting and the theory of robust signal processing. The mentioned method can preserve the edge, reduce the blocky effectiveness, and reconstruct high-resolution image. Simulated result shows that the effect of super-resolved image restoration by the proposed method is better than that by the nearest-neighbor in?terpolation and the bilinear interpolation.

AM-FM Interference Mitigation for Global Positioning System Using Time frequency Analysis and Synthesis

WANG Li-jun, ZHAO Hui-chang, YAN Li-li,HU Ze-bin

2006, 27(6):  1031-1034.  doi:10.3969/j.issn.1000-1093.2006.06.017

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GPS signal contaminated by interference was firstly transformed into time frequency domain with Wigner-Ville distributions, and then interference was reconstructed using time frequency synthe?sis techniques. Interference subspace and its orthogonal subspace were created on basis of the principle of subspace projection techniques. Interference was suppressed by projecting the received signal into orthogonal subspace of interference. The BER performance of matched I liter output was simulated and analyzed. The simulation results show that anti-jamming performance is approximately improved by 30 dB in comparing between with and without preprocessing methods.

An Algorithm of Tracking a Maneuvering Target with Bearing- only Measurements

LIU Xiang-dong, CHENG Xiang, ZHANG He

2006, 27(6):  1035-1038.  doi:10.3969/j.issn.1000-1093.2006.06.018

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The bearing-only location is a nonlinear state estimation in essence; the single observer pas?sive tracking may form a unobservable system, makes the, tracking filter instable and divergent. The target location and tracking were analyzed by the mine fields composed of some anti-helicopter mines. The algorithm is a combination of least angle difference algorithm and adaptive filtering algorithm based on current statistical model, least angle difference estimation is used as the measurement of adap?tive filter. The results show that the algorithm is simple and efficient for accurately estimating target parameters of maneuvering and non-maneuvering movements.

A Study of Performance Assessments of Image Fusion for Color Night Vision Using Kntropy

SHI Jun-sheng, JIN Wei-qi

2006, 27(6):  1039-1042.  doi:10.3969/j.issn.1000-1093.2006.06.019

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The aim of this paper is to study the practicability of statistical methods for assessing color fusion images of night vision. Based on analyzing statistical methods, the entropy was selected to assess color fusion images for night vision. The entropy of a color fusion image was calculated by the optimal color numbers automatically obtained with clustering method. Experiments of subjective assessments and entropy calculations were performed for 40 color fusion images generated by 4 kinds of fusion algo?rithms fusing visible and infrared images of 10 scenes. Experimental result shows that the correlation coefficient between perceptual quality and entropy is only 0.41, the entropy method is difficult to as?sess color fusion images for night vision. The inherent shortages of the traditional statistical method were discussed in the end.

Military Applications and Prospect of Augmented Reality

HTJANG Tian-zhi，LIU Yue, WANG Yong-tian, YAN Da-yuan

2006, 27(6):  1043-1046.  doi:10.3969/j.issn.1000-1093.2006.06.020

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Augmented reality is an evolving field of virtual reality technology widely adopted in business applications. Recent developments of the technique and device in augmented reality system for military use were presented. Requirements of augmented reality system for military use were analyzed and their future application prospects in information battlefield were discussed. The significance of augmented reality in military use were further illustrated.

A Study on the Spectral Matching Technology of the LLL Night Vision System with Laser Illuminator

LIU Lei, CHANG Ben-kang, DI Hui-ge, QIAN Yun-sheng

2006, 27(6):  1047-1050.  doi:10.3969/j.issn.1000-1093.2006.06.021

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According to the spectral distribution of the laser illuminator and reflectance of the scene, the spectral distributions of reflection ol dark green paint, rough concrete and green vegetation under the laser radiation were deduced. The spectral matching factors between photocathode spectral re?sponse and scene reflecting spectrum were calculated for the LLL night vision system with laser illumi-nator. The effect of the spectral matching factor on intensity of illumination and contrast was ana?lyzed .The spectral matching factor can instruct visual range evaluation and performance simulation for night vision system under field cirdumstances.

Automatic Test Data Generation Based on Usage Model and tjrenetic Algorithm

ZHOU Xian-zhong, SUN Yong-cheng，JIANG Jin-long

2006, 27(6):  1051-1055.  doi:10.3969/j.issn.1000-1093.2006.06.022

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Automatic generation technology of test data is an important field of software test, which is an effective method to promote the efficiency and the effect of software test. In order to ensure that the more frequently used features would be tested more thoroughly, usage model and genetic algorithm were integrated together. One programming model was proposed, in which the optimal objective func?tion was defined as the required test data number for whole software test. The methods to decide the weight of path and to select the target path set were presented. Three key elements, 1.e. path weight, path coverage ratio and path approximation level were incorporated for designing the fitness function. An example shows the rationality and validity of the model and the methods.

A Computational Model of Fuzzy Reliability for Cylindrical Torpedo Shell

TANG Li-dong, SONG Bao-wei, MAO Zhao-yong, LI Zheng

2006, 27(6):  1056-1059.  doi:10.3969/j.issn.1000-1093.2006.06.023

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A computational model of fuzzy reliability aimed at the solution of engineering problems with random stress-fuzzy strength was presented. Its mathematical basis is that fuzzy probability can be computed with the method of conventional probability by use of a mathematical transition. Based on this, a numerical algorithm was given which can be applied to compute the fuzzy reliability of cylindri?cal shell. Tnis lays a foundation for the reliability analysis of systems consisting of the components with fuzzy reliability. Computational result fits well with engineering experience.

Risk Analysis of Reliability Assurance Test in the Case of Exponential Distribution

ZHANG Zhi-hua

2006, 27(6):  1060-1063.  doi:10.3969/j.issn.1000-1093.2006.06.024

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As the test time needed is very short, the assurance test is highly appreciated. The hierar?chical prior distribution of iailure rate was determined based on reliability acceptance test data. The risks of special assurance test (0.212 test) from Bayesian statistical viewpoint were analyzed, a sam?pling scheme for the assurance test in exponential case was given. An example illustrates that the method is feasible.

An Improved Method of Predicting the Modal Loss Factors of Constrained Damping Structure

GUO Zhong-ze, LUO Jing-run, CHEN Yu-ze

2006, 27(6):  1064-1067.  doi:10.3969/j.issn.1000-1093.2006.06.025

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The Reissner sandwich plate theory was applied to predicting the natural frequencies and modal loss factors of constrained damping structure. As the basic hypothesis of the Reissner theory was excessively simplified leading to lower computed accuracy, the method of predicting the natural fre?quencies and the modal loss factors of constrained damping structure was improved. The improved computing result is fairly close to that of the Ansys. The improved Reissner method is fit for calculat?ing the natural frequencies and modal loss factors of constrained damping structure.

Investigation on Microstructure and Property of Low- carbon Steel Surface Strengthened Layer

XU Jin-yong, SONG Yi-mei，GAO Yuan, YU Yun-jiang, XU Zhong

2006, 27(6):  1068-1071.  doi:10.3969/j.issn.1000-1093.2006.06.026

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Mo-Cr penetrating layer on Q235 low-carbon steel was built up by double glow plasma sur?face metallurgy and then the technological process of ultra-saturated carbonization, quenching and low tempering was made. The fundament is that alloying elements Mo, Cr are penetrated into the carbon steels in a vacuum chamber by glow discharge sputtering. The surface to be tested is under the follow?ing conditions: the depth of coating is over 100 μm and the contents of Mo, Cr in a alloyed surface lay?er of low-carbon steal are respectively about 20% and 10% and surface carbon content is 2.0% above after ultra-saturated carbonization. The abrasion experimental results show that the average friction co-efficient is 0.1 and the average relative wearability is 2.25 times as much as one of GCrl5. The alloy layer possesses a very strong ability against temper softening, its surface hardness still exceeds 595 HV0.025 after tempering for 4 h at 690°C . Resistance to tempering of the alloy layer is similar to metal?lurgical HSS.

A Survey on Backlash Nonlinearity

ZHAO Guofeng, FAN Wei-hua, CHEN Qing-wei, HU Wei-Ii

2006, 27(6):  1072-1080.  doi:10.3969/j.issn.1000-1093.2006.06.027

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A survey was presented that generalizes studies in the area of backlash nonlinear control in recent years. Different backlash models and compensation aoproaches for backlash nonlinearity were analyzed, and applications of various methods in the field of backlash nonlinearity control were intro?duced for systems with backlash located in various positions. Some remarks on the issue were given.

Composite Evaluation of Operational Effectiveness for Weapon Equipment Based on Multiple Criterion Decision Making

ZHANG Chao, MA Cun-bao, HU Yun-lan, XU Jia-dong

2006, 27(6):  1081-1085.  doi:10.3969/j.issn.1000-1093.2006.06.028

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The main evaluation methods of operational effectiveness were reviewed, the applied area of these methods was analyzed, and their advantage and disadvantage were contrasted. According to the knowledge of operational effectiveness and system engineering, a novel model of weapon equipment op?erational effectiveness based on multiple criterion decision making (MCDM) was proposed. Aimed at the relativity, incomparability and grayness of operational performances, quantitative composite evalu?ation indices were analyzed applying a gray correlation projection method, and ultimately an ordering for the weapon equipment was reached. Engineering practicability of the new model and algorithm is validated by the case involving three types of submarine launched torpedoes. The result shows that this method is more effective than a fuzzy correlation evaluation method and a gray correlation evaluation method.

A Study of Battlefield Damage Assessment with Case-based Reasoning

WANG Run-sheng, JIA Xi-sheng, WANG Guang-yan, WANG Run-quan

2006, 27(6):  1086-1089.  doi:10.3969/j.issn.1000-1093.2006.06.029

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It is the premise and the basis of a successful battlefield damage repair to implement a rapid and correct damage assessment. Carrying out the study of battlefield damage assessment with case- based reasoning (CBR) is significant for improving the preciseness and efficiency of battlefield damage assessment. CBR of battlefield damage assessment was studied, including the determination of case contents, the extraction of case attributes, the delineation of cases and the building of case retrieval mechanism.

Readiness Simulation of Ship Equipment Based on Monte-Carlo Method

CHENG Wen-xin, CHEN Li-qiang，GONG Shen-guang, DING Yong-zhong

2006, 27(6):  1090-1094.  doi:10.3969/j.issn.1000-1093.2006.06.030

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The term Readiness implies a comprehensive parameter comprising not merely reliability, maintenability and supportability, but also an index of integrated logistic support. It is an important symbol scaling the practical combat capability of the fleet. The simulation of readiness is a key to opti?mize the processing of equipment design scaling the work of integrated logistic support. A model was set up based on the equipment parameter and using regulation appling the theory of Monte-Carlo sam?pling, event simulation, mathematical statistics and computer simulation. Results of its application show that the model can not only evaluate the reasoning of integrated logistic support of equipment on duty and find the key factors affecting the mission, but also layout the supportability design of the system.

Experimental Techniques and Analysis

Mechanical Admittance Measurement and Analysis of Gun- Shoulder Cbystem of Standing Non-rest Automatic Weapon

BAO Jian-dong, WANG Chang-ming, KONG De-ren，HE Yun-feng

2006, 27(6):  1095-1098.  doi:10.3969/j.issn.1000-1093.2006.06.031

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Many factors that influence the firing accuracy of automatic weapon cause a gunpoint to be deviated from initial value with the result that the iiring accuracy of weapon falls since the impulsion of powder gas and the impact between moving parts lead to the change of movement state of gun-shoulder system during iiring. It is necessary to develop an intelligent controlling gun carriage for weapon sys-tem in order to reflect the automatic iiring accuracy of it objectively. An electronic measuring system has been built up for the shoulder’s receiving force and gun-shoulder movement of gun-shoulder system in the light of the characteristics of standing non-rest automatic system. The composition of measuring system and the correction method of shoulder’s receiving force were presented. The mechanical admit?tance functions of gun-shoulder system were derived from electronically measured data, and an orthog?onal component method was used to identify the mode for the admittance functions of gun-shoulder system. The important difference between passive state and initiative state of standing non-rest auto?matic weapon was inquired.

An Experimental Study of RF Excited Diffusively Cooled All-metal Rectangle Waveguide CO2 Laser

YAO Shu-na, SU Ning, XIN Jian-guo

2006, 27(6):  1099-1102.  doi:10.3969/j.issn.1000-1093.2006.06.032

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An experimental study of 100 W radio excited diffusively cooled all-metal rectangle waveg?uide CO2 laser was carried out. Ine CASE-I parallel plane resonator was used in the experiment. The experimental result indicates that the laser power achieves 146 W by use of the output mirror of trans?missivity 10 %，and the electron-photon conversion efficiency is 17.3 % . The laser power drawing from unit gain volume is 9.46 W/cm3.

Telescopic Optical System Transmittance Detection Based on the Cross- correlation Technique

DONG Qi-shun，JIANG Tao, ZHANG Sen, PANG Mei-juan

2006, 27(6):  1103-1105.  doi:10.3969/j.issn.1000-1093.2006.06.033

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Optical system transmittance is the ratio of optical instrument emergent light flux to the in?cident light flux, signifies the degree in wmch an optical instrument transmits the light radiant energy. It is a performance index in an optical system, especially in the telescopic optical system. Based on the correlation detection rule, an optical transmittance detection method with double beams and double fre?quencies was proposed. The method improves the precision of detection, fulfills it in the bright field and replaces the single channel optical system regularly in use.

Comprehensive Reviews

Progress in the Research on Oxidation Mechanism of Metallic Nanopaxtides

WANG Jian-jun，SONG Wu-lin, GUO Lian-gui, XIE Chang-sheng, ZENG Da-wen

2006, 27(6):  1106-1110.  doi:10.3969/j.issn.1000-1093.2006.06.034

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It is necessary to study the oxidation mechanism of metallic nanoparticles because the surface of metallic nanoparticles is easily oxidated to lose reactivity in air. The study of the oxidation mecha?nism of metallic nanoparticles in recent years was reviewed synthetically from the oxidation behavior of metallic nanoparticles, the growth dynamics of oxide films and molecular dynamics simulations. In ad?dition, the problem and future development in this research field were pointed out.

Short Papers

Study on Damage Field Theory and Its Application

YANG Bozhong

2006, 27(6):  1111-1113.  doi:10.3969/j.issn.1000-1093.2006.06.035

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The damage field theory and model were established by using the theories of firing, mathe?matics and many other subjects. A new method and software to evaluate iirmg damage probability were proposed by using the damage field theory and model. According to the calculation results, tne damage probability calculated by damage field theory is bigger than that of traditional method because 3-dimensional damage is taken into account in new method.

Odd-Order Cumulant Calculation Optimization and Its Application

GUO Ye-cai, ZHAO Jun-wei

2006, 27(6):  1114-1118.  doi:10.3969/j.issn.1000-1093.2006.06.036

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For extracting higher order frequency coupling feature radiated by actual nonlinear vibration system via odd-oraer cumulants (OOC), quartic frequency coupling and quadratic-to-cubic frequency coupling were firstly defined, OOC features analyzed, the relation between OOC calculation method and its computational load was studied. Based on these researches, OOC calculation optimization algo?rithm with low computation complexity, which can turn OOC direct estimation into its recursive esti?mation and OOC multi-dimension operation into its one dimension operation, was proposed. The 〇OC，which is computed by optimization algorithm, based adaptive line enhancer (OOCBALE) was developed. The OOCBALE can recover or extract quartic frequency coupling feature and quadratic-to- cubic frequency coupling feature etc. in Gaussian noise. Theoretic analysis and simulation result prove the proposed algorithm to be valid.

A Study on Non-contact Photoelectric Measuring System for the Dimension of Saddle Ring

XU Xi-ping, WANG Li-ming, HAN Qiang,ZHANG Guo-yu, SU Shi, YUAN Feng

2006, 27(6):  1119-1121.  doi:10.3969/j.issn.1000-1093.2006.06.037

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Based on laser displacement inspecting principle and modern photoelectric sense technology, a kind of non-contact measurement technique was put forward, the roundness error and the diameter of saddle ring 1.e. large-size rotary solid part can be measured by the designed system. The building up, the principle and the mathematical model of the system were discussed, the measuring error was ana?lyzed, and the real time computer data processing system based on LabVIEW language platform was designed. The experiment result confirms that the precision of the system is up to 土 0.02 mm.

A Study on the Theory of Cyclic Redundancy Check Distributed Algorithm and Its FPGA Implementation

BI Zhan-kun, HUANG Zhi-ping, ZHANO Yi-meng, WANG Yue-ke

2006, 27(6):  1122-1125.  doi:10.3969/j.issn.1000-1093.2006.06.038

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Cyclic Redundancy Check (CRC) algorithm is widely used in measurement & control and communication fields to improve the reliability for data transmission. However, traditional CRし algo- rithm based on the bit cannot meet the requirements of high-speed signal processing. By the look-up- table architecture and distributed operation in FPGA, the bottle-neck of speed can be resolved on a large scale. The CRC distributed algorithm was deduced, from which CRし distributed algorithm cor?responding to polynomials of any order and any bit width processing can be derived. The algorithm achieves a higner processing speed and better stability in actual applications.

The Foundation and Application of the Check Baseline in a Radar Research Base

TIAN Lin-ya，HUA Xi-sheng

2006, 27(6):  1126-1128.  doi:10.3969/j.issn.1000-1093.2006.06.039

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In order to satisfy requirements in settling the positions of research, marKmg the true north of equipments as well as others, a check baseline is required to have high accuracy in the true north, azimuth errors and distance errors. GPS D-order standard is adopted to proceed with horizontal control survey, polar coordinate method of high precise total station is adopted to layout points and the GPS C- order standard adopted to measure accurately the coordinates of basepoints. The precision analysis and practical application prove the results to be reliable.

Initial Missile Ballistic Analysis Under the Condition of the Interference of a Helicopter's Rotor Down-wash Flow

WEI Jing-biao, ZHENG Hua-Ii

2006, 27(6):  1129-1131.  doi:10.3969/j.issn.1000-1093.2006.06.040

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Combining momentum theory and vortex theory, rotor circulation equation was deduced. The rotor down-wash flow field was calculated using generalized down-wash flow model. On this ba?sis, the initial missile trajectory was calculated on both the conditions with and without rotor down- wash flow. The result indicates that the rotor down-wash flow has an obvious influence on the initial missile trajectory.

Research Notes

The Applications of Markov Chains to Estimating Expected casualties of Naval Mine- sweeping

HONG Xing, SONG Yuan, MA Ai-min

2006, 27(6):  1132-1135.  doi:10.3969/j.issn.1000-1093.2006.06.041

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In naval mine-sweeping, two forms of the progressive sequence mine-sweeping technique can be adopted ： from the one side of the channel to the other and from the center of the channel outward. The theory of Markov chains was fruitfully applied to estimating the expected mine-sweeper casualties of the two forms of the progressive sequence sweeping technique. The Markov chains analysis results show that the expected casualty of the former form is the same as one of the latter form at unknown or infinite mine-field boundary, the expected casualty of the former form is less than one of the latter form at known or finite mine-field boundary. The results can be applied to select a better progressive sequence mine-sweeping technique.

Spare Supporting Rate Based Model of Carrying Spares

WANG Zheng- yuan, LI Jin, ZHU Yu,SONG Jian-she

2006, 27(6):  1136-1139.  doi:10.3969/j.issn.1000-1093.2006.06.042

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Better scheme of carrying spares may decrease the rate of spares out of stock and get higher supportability with carrying ability given. A general model of carrying spares was proposed, its heuris?tic solution was given. The objective function of the model was determined by the spares’ effect on the task of equipment. So the model may be different in various importance of spares. The models were es?tablished and the quick solutions were presented in two kinds of especial conditions. Experiments show that spare supporting rate based model of carrying spares is close to the reality and the solution of the model is simple and convenient. It satisfies the demand of real time scheme of carrying spares in battle field.