Table of Content

31 August 2006, Volume 27 Issue 4

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Paper

An Integrative Model for Predicting Cooling Performance of Tanks

BI Xiao-ping, ZHAO Yi-xian, LIU Xi-xia, WANG Pu-kai, XU Xiang

2006, 27(4):  577-582.  doi:10.3969/j.issn.1000-1093.2006.04.001

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Aiming at the fact that cooling process of tanks is related to various physical actions of its solid parts or fluids, an integrative prediction conception has been presented for cooling performance of tanks from overall and comprehensive views. The integrative prediction model has been established in which engine combustion heat and part inction heat act as heat sources. Solid parts in power chain have been divided into heat nodes based on the lump mass. Heat transfers between nodes and coolant, nodes and lubricant, nodes and engine compartment air, nodes and engine intake air, nodes and engine combustion gas, nodes and engine exhaust gas, one noae and other nodes have been taken into ac?count .Coolant flow, lubricant flow and engine compartment air flow have also been taken into consid?eration .The prediction model can be resolved by using algorithms combined with boundary/ inner pa?rameter coupling and local/ unitary convergency. Example calculation shows that the prediction model can implement integrative prediction of cooling performance for tanks and armoured vehicles at differ?ent environment temperatures and running conditions with better precision.

Analysis of Electric Drive System Projects in Tracked Armored Vehicles

LIAO Zi-li，MA Xiao-jun, ZANG Ke-mao, TANG Jiu-wang

2006, 27(4):  583-586.  doi:10.3969/j.issn.1000-1093.2006.04.002

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Characteristics of different projects of electric drive system for tracked vehicles were ana?lyzed. For the two most typical projects, parameters of power, torque, rotating speed etc. of drive motor were studied under the conditions of satisfying adequate steering performance of the tracked ve?hicles. General opinions on the two projects were then brought forward and relevant conclusions drawn.

Noise Source Identification and Noise Reduction for Diesel Engine

LIANG Xing-yu, SHU Ge-qun

2006, 27(4):  587-591.  doi:10.3969/j.issn.1000-1093.2006.04.003

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Partial cylinder misfiring methoa is used to separate macnmery noise and combustion noise. rhe radiating noise sources are identified with near field scan technique and the main part of surface ra- aiating noise can be found. By modifying the advanced angle of fuel supply, combustion noise is re?duced. In order to decrease torsional vibration of the crankshaft, a new-designed torsional vibration damper is applied to the free-end of cranKshaft. By altering the shape of oil pan, radiation noise can al?so be suppressed to a certain extent.

Modeling of Induction Motor Driving System and Performance Forecast on Electric Transmission of Tracked Vehicle

CHEN Shu-yong, SUN Feng-chun

2006, 27(4):  592-597.  doi:10.3969/j.issn.1000-1093.2006.04.004

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The principle of rotor flux-orientation vector control on 100/150 kW three-phase AC induc?tion motor for electric transmission tracked vehicle was analyzed, the mathematic model was deduced. The modeling and simulation on the driving system oi induction motor were completed by Matlab/ Simulink. The characteristics of motor and driving system were analyzed and evaluated in detail by practical bench test. The simulation and bench test results show that the model is valid and the driving control system has constant torque under rated speed, constant torque above rated speed, widely vari?able speed range ana better dynamic performance. In order to evaluate the practical applications of high power induction motor driving system on electric transmission tracked vehicle, collaborative simulation based on interface technology of Matlab/Mmulink and multi-body dynamics analysis software known as RecurDyn was done, the vehicle’s performances about the acceleration time(0?32 km/h) and turning characteristic (t; = 10 km/h, R=B) forecasted.

System Control Scheme for Single Motor Crossdrive Electric Transmission Tracked Vehicles

TANG Jiu-wang, LIU Wei-ping, LIU De-gang, LIAO Zi-Ii

2006, 27(4):  598-603.  doi:10.3969/j.issn.1000-1093.2006.04.005

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A systematic control scheme for single motor crossdrive electric transmission tracked vehicles has been developed, and the analysis of the scheme was concretely described. Based on the difference of functions between electric transmission vehicular manipulators and traditional manipulators, the def?inition of manipulative signal was analyzed qualitatively and quantitatively with the consideration of man-machine harmony. Then, the strategies and its details for propulsive motor control, steering mo?tor control and their concurrent control were given. At last, the accelerating and steering process of an electric tracked vehicle controlled by proposed control scheme was simulated. The simulating results reveal that the control scheme is feasible and it could make the venicle have excellent accelerating and steering capability.

Hydraulic System of the Amphibious Vehicle and Its Fault Diagnosis Search Strategy

YAO Cheng-yu, ZHAO Jing-yi

2006, 27(4):  604-607.  doi:10.3969/j.issn.1000-1093.2006.04.006

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In order to improve the performance of amphibious vehicle both on land and in water, the hydraulic arive system with closed loop was accomplished. In accordance with complex structure and information transmission and more faults of the hydraulic system, fault diagnosis of shutdown of pump-engine” is taken as a practical example, and an optimal search strategy is found by using fault tree analysis (FTA) method and considering simultaneously search cost and fault probability. Ihis ap-proach proposed overcomes the insufnciency of FTA in searching faults, and rapidity and accuracy of fault diagnosis are improved. As a result, the optimal searching of hydraulic system fault diagnosis is realized and system reliability is ensured.

Reliability- based Sensitivity Design of Vehicle Components Upon Information of Incomplete Probability

ZHANG Yi-min, HE Xiang-dong, LIU Qiao-ling,WEN Bang-chun

2006, 27(4):  608-612.  doi:10.3969/j.issn.1000-1093.2006.04.007

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Based on the theory of reliability design and sensitivity analysis, reliability-based sensitivity design of the vehicle components was studied and its numerical method was presented. The regularities of variation in reliability sensitivity were obtained, and the effects of design parameters on the reliabili?ty of vehicle components were studied. The method presented in tms paper provides theoretical basis for the reliability-based design of the vehicle components.

Design and Analysis of a Oun Recoil Magneto- Rheological Damper

HOU Bao-Iin

2006, 27(4):  613-616.  doi:10.3969/j.issn.1000-1093.2006.04.008

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A gun recoil magneto-rheological (MR) damper for a gun test application is studied m this paper. Iaking note of the shock characteristics of MR damper applied to gun recoil dynamics, a one-dimensional parallel-plate laminar flow model of the MR recoil damper was constructed based on Her- schel-Bulkley shear model. The finite element analysis of the magnetic field for a MR valve of the damper was done via ANSYS package, and the magnetic flux density of MR valve was obtained. Com?bining the MR fluid flow model and the FEM model of MR valve, the relation curves of damping force vs. piston velocity of the MR damper were obtained. Using the force-velocity characteristics of the MR damper, the recoil dynamic equation of 25 mm gun was solved, and the influence of MR fluid behavior index on the performance of MR recoil damper was evaluated. The simulation results indicate that the performance of this gun recoil damper satisfies the design requirements.

Multi-objective Optimization of Composite Barrel Based on the Improved Non-dominated Sorting Genetic Algorithm

XU Ya-dong, QIAN Lin-fang

2006, 27(4):  617-621.  doi:10.3969/j.issn.1000-1093.2006.04.009

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A multi-objective ootimization model of composite barrel was developed based on the finite element model and optimization method for the multi-objective design requirements during barrel design process. The fundamental frequency and structure weight of barrel are defined as two optimiza?tion objectives. The winding angle and tnickness of the composite layers are defined as design vari- aoles. And the improved non-dominated sorting genetic algorithm (NSGA-II ) is employed as an opti?mization method. The Pareto solution set of composite barrel is obtained by optimal solving. The opti?mization examples show that the uniformly distributed Pareto front is obtained by using NSGA- II， and the corresponding design solution of composite barrel is improved in stiffness and weight.

Riccati Discrete Time Transfer Matrix Method for Multibody System Dynamics

HE Bin, RUI Xiao-ting, LU Yu-qi

2006, 27(4):  622-625.  doi:10.3969/j.issn.1000-1093.2006.04.010

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Discrete time transfer matrix method for multibody system dynamics (MS-UT-TMM), a novel method for multi body dynamics simulation, has been developed in recent years. If using this method to simulate multibody dynamics, the global dynamical equations need not be developed, and such characteristics as lower order of global system matrix, fast computation speed, flexible modeling can also be obtained. To improve the numerical stability of MS-Dl- TMM, in this investigation, MS- DT-TMM and Riccati transform are com Dined. Then a new method is formed, namely Riccati MS- DT-TMM. So boundary value problem of space transformation in MS-Dl-丄'MM becomes the original value problem in Riccati MS-DT-TMM and the order of matrix can be reduced again. To shorten the computational time again, the intermediate variables of Riccati transfer matrix method used in vibra?tion mechanics are improved without changing calculation precision and memory storage. Compared with MS-DT-TMM, if using the proposed method, the numerical stability not only in space field but also in time field can be improved and the CPU time can be economized synchronously. The numerical example of one hundred thousand degree of freedom system to validate the method has been given. It can show that the proposed methoa is a powerful tool for engineering application in multibody system dynamics field.

An Analysis on Factors Leading to Auto-firing in Wedged Breach

ZHANG Jing-xin, GUO Xin-yu

2006, 27(4):  626-629.  doi:10.3969/j.issn.1000-1093.2006.04.011

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The factors leading to auto-firing (AF) accidents in wedged breacn mechanisms of guns, starting with the force-bearing analysis of the firing device, or main reasons leading to such AF phe?nomenon were analysed. Based on tnis, the theory of the safety limit wear angle was put forward; and the safety limit wear angle was obtained. Corresponding measures were then put forward to compen?sate for the defects of safety in the traditional firing device, so as to prevent the AF accidents from happening. The preventive assumption is either the provision of an auxiliary safety mechanism, or the establishment of replacing a system and a testing criteria for the easily-damaged parts.

Design for the Seal System and Charge of a CTA Gun

ZHANG Hao, LU Xin, YU Yong-gang，ZHOU Yan-huang

2006, 27(4):  630-633.  doi:10.3969/j.issn.1000-1093.2006.04.012

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The cased telescoped ammunition (CTA) gun makes use of new principle of propulsion. Both its ammunition and the gun structures are different from the conventional guns. The seal system for the rotating chamber and the charge design are the two key techniques in a CTA gun. For a good interior ballistic performance, the authors studied the propulsion principle of a CTA gun. Based on experiments, the charge of a CTA gun was designed, and some schemes were given, such as the mate?rial ana the length of the flash tube, the material and the structure of the control tube and the lock pieces on the forehead of the pill. To ensure the reliability of the seal between the cnamber and the gun barrel, a novel self-impacted combined seal system was designed, which provides a good solution for the problem under radial transient high pressure. Furthermore, the authors describe some experimen?tal phenomena and especially some successful techniques and experiences testified by experiments.

A Study on Burst Point Accurate Control of Electronic Time Fuze

HE Zhen-cai, HUANG Xue-gong, CHEN He-juan

2006, 27(4):  634-637.  doi:10.3969/j.issn.1000-1093.2006.04.013

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Based on some traditional means of the burst point accurate control, a new method was put forward by combining turn-counting and time-counting. The theory of the burst point accurate control of electronic time fuze was analyzed, and the realizable method was specifically designed. The geomag?netic turn-counting sensor was selected, and the method was theoretically analyzed and concluded.

Numerical Simulation of Detonation Parameters for TNT and TATB Detonation Products

LI De-hua, OHENG Xin-lu，YANG Xiang-dong,HU Dong

2006, 27(4):  638-642.  doi:10.3969/j.issn.1000-1093.2006.04.014

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The equilibrium compositions of TNT and TATB explosives detonation products are calcu?lated by minimizing the oibbs free energy and solving the chemical equiliDrium equations. The calcu?lated results are very close to that of BKW and LJD equation of state. We consider the four states of carbon, graphite, diamond, graphitelike, diamondlike, and calculate the Gibbs free energy of carbon by using our programs. The improved WCA equation and Ross’s variational perturbation theory were used for the equation of state of detonation products, and the detonation properties of TNT and TATB explosives were calculated. The calculated detonation velocity and pressure at CJ point match well with the experimental data.

Synthesis of Bismuth Citrate and Its Effect on Combustion of Double-base Propellant and RDX-GMDB Propellant

SONG Xiu-duo, ZHAO Feng-qi, ZHANG Rui-e, GAO Hong-xu, HAO Hai-xia, Li Shang-wen

2006, 27(4):  643-647.  doi:10.3969/j.issn.1000-1093.2006.04.015

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Using citric acid and Bi2〇3 as raw materials, bismuth citrate (CIT-Bi) was synthesized in 80% yield. Its chemical structure was characterized using FT—IR, X-ray fluorescence diffraction and elementary analysis. The catalytic performance of CIT-Bi m the combustion of double-base propellant and RDX—CMDB propellant was investigated. The result shows that CIT-Bi possesses good catalytic effect on combustion of double-base propellant and RDX—CMDB propellant and excellent ability to reduce pressure exponent. Especially, when CIT-Bi together with a little carbon black (CB) is used, the catalytic efficiency is higher. And the catalytic mechanism of CIT-Bi was studied by TG-DTG, X-ray fluorescence diffraction and FT—IR.

Corrosion of Firearm and Bullet from Moulds and Its Prevention

HU Shang-qin, WEI Wei

2006, 27(4):  648-651.  doi:10.3969/j.issn.1000-1093.2006.04.016

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The five kinds of moulds selected according to the military standard were inoculated to four sampling groups of military firearm and bullet by man-made measures. The first group was sealed up in plastic bag with wasaoi as preservative, the second group was not sealed up with wasabi, the third group was also not sealed up but without wasabi, and the fourth group was sealed up without wasabi as preservative. The test was conducted alternately under the conditions of temperature in (30 ±1) °C and humidity in (95 ± 5) % . The results after 56 d show that there is no corrosion for the first group and the mould propagation is few for the second group, the area of corrosion is about 0.04% ?0.53% . But, the areas of propagating moulds are 11.02% ?19.51% and 7.21 % ?14? 60% separately for the third and fourth groups, that are 64.2 ?191.7 times as much as the second group. It is concluded that selection of preservative and drier under the seal condition is the effective way to control the corrosion from moulds and reduce the mould harm to military firearm and bullet.

Neural Network-based Low-light-level Image Enhancement and Reconstruction

ZENG Gui-lin, SU Bing-hua, NIU Li-hong, SU Xue-zheng

2006, 27(4):  652-654.  doi:10.3969/j.issn.1000-1093.2006.04.017

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The degradation of low-light-level image mainly depends on sensitivity, non-linearity and noise of detectors. Neural network is a high complicated and non-linear kinetic system. An multiple layer propagation (MLP) neural network-based enhancement and reconstruction method for low-light- level image was proposed. An adaptive BP training algorithm with momentum term is used in order to quicken learning speed. Experiments show that the proposed neural network is workable and offers the excellent results for enhancement and reconstruction of low-light-level image.

An Edge-preserving-based Infrared Image Interpolation Algorithm

LI Huai-qiong, CHEN Qian, SUI Xiu-bao

2006, 27(4):  655-658.  doi:10.3969/j.issn.1000-1093.2006.04.018

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The resolution of infrared focus planar array (IFPA) is low and the edge of its output image is blurring at present. A new edge-preserving-based infrared image interpolation algorithm was pro?posed to get high quality and resolution infrared image. Firstly, the image edge is extracted, then the gray of these edge pixels is mapped to a new enlarged image. Secondly, the image is interpolated along the edge direction, and the non-edge area is bilinearly interpolated. After these steps, the whole opera?tion is finished. This algorithm not only enlarges the image smoothly, but also keeps the detail of the edge.

Reduced-Order EKF Application in A Marine INS/GPS Navigation System

XXJ Jin-hua, XU Jiang-ning, ZHU Tao, et al

2006, 27(4):  659-664.  doi:10.3969/j.issn.1000-1093.2006.04.019

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Integrated navigation for GPS/INS provides alternatives for long-term stability and high accuracy due to their complementary properties. A stand-alone navigation system with high accuracy will be of high cost. Integration of the medium accuracy sensors, with the properly integrated method, can acmeve higher accuracy and long term stability at a lower cost. It is the goal of the present project- TNDS (true north determination system) . The TNDS integrates MS860 and INS with a PC/104 embedded computer system processing the data. The INS error model including the proper error states for the actual physical system TNDS has been developed. Based on the model, a proposed GPS/INS reducedorder J^KF (extended kalman Filter) algorithm design for TNDS and marine tests were achieved. The tests show that the INS position errors are reduced from more than 100 m to 40 m after correction. The heading error a are reduced from 0.105° to 0.034° after correction. The accuracy in roll and pitch is also increased greatly by the integration. Whole set of tests show that the TNDS performance is significantly improved by GPS/INS reduced-order EKF algorithm.

Linear Canonical Transform and Its Implication

DENG Bing, TAO Ran

2006, 27(4):  665-670.  doi:10.3969/j.issn.1000-1093.2006.04.020

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As an emerging tool for signal processing, the linear canonical transform(LCT) proves itself to be more general and flexible than the Fourier transform as well as the fractional Fourier transform. So it can slove problems that can’t be dealt with well by the latter. In this paper, the definition of LCT and some special cases are given at first, followed by its properties as listed. Besides, the discrete linear canonical transform is introduced. The implication of LCT is illustrated finally, displaying LCT's potentials and capabilities in the field of signal processing.

A Novel Tandem-type Adaptive Line Enhancer

GUO Ye-cai, HAN Ying-ge，ZHAO Jun-wei

2006, 27(4):  671-675.  doi:10.3969/j.issn.1000-1093.2006.04.021

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For greatly improving the ability of the sonar detection system to detect the underwater moving target(UMT), FOCVSSBALE (fourth order cumulation variable step-size sign iteration based adaptive line enhancer) was proposed. A novel tandem-type adaptive line enhancer ( NTTALE), whose first level filter is the FOCVSSBALE whereas whose second level filter is a short-term autocor?relation based adaptive line enhancer (STABALE), has been developed. The proposed NTTALE has the ability to nandle undersea ambient noise twice, to enhance the UMT radiated line spectrum feature twice, and to track well time-varying signals. Theoretical analysis and simulation tests with the UMT- radiated data show that the NTTALE has tne excellent performances in suppressing non-Gaussian noise, enhancing line spectrum signals, and tracking time-varying signals compared with the single STABALE or FOCVSSBALE.

Zero Differential Orthogonal Searching Scheme for Optimal Polarization Based on the Polarization Ratio Parameters

YANG Yun-fu, TAO Ran, WANG Yue

2006, 27(4):  676-680.  doi:10.3969/j.issn.1000-1093.2006.04.022

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For the signal-to-interference-and-noise-ratio( SINR) equation based on the polarization ratio parameters, an optimal polarization scheme called zero differential orthogonal searching (ZDOS) was suggested and discussed in detail. There are three key points in ZDOS ： the global optimal point of the SINR is aoproached to by the first optimization along a special line, then the searching processes are designed along two orthogonal lines to search the minimal differential in each direction, and this searching method uses only the last local optimal solutions simply. Many experiments were made, and the range of the parameters was given. These experimental results show that ZDOS scheme takes gen?erally several steps to reach the global optimum.

Study on Evaluation of Smokescreen Jamming Effectiveness

GAO Wei

2006, 27(4):  681-684.  doi:10.3969/j.issn.1000-1093.2006.04.023

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This paper devoted to the methods for evaluating the jamming effectiveness of smokescreen jamming devices on electro-optical imaging systems and eleclro-oplical guided weapons. The evaluation rules of jamming effectiveness were presented. For smokescreen jamming upon the electro-optical imaging system for observing or aiming, the jamming effects are graded into three rates according to the degrees of interference to target identification. Quantitatively, the correlation function is proposed as an evaluation index for smokescreen jamming effectiveness and the jamming effects are graded into three rates according to the correlation function of the two images before and after being jammed. For smokescreen jamming upon the imaging system for automatic tracking, the proposed criterion for jamming effectiveness is whether the imaging system under jamming could produce effective tracking errors, or its tracking error under jamming is three times greater than its tracking accuracy when there is no jamming. For smokescreen jamming upon the guided weapon, the proposed criterion for jamming effectiveness is whether the miss distance of the guided weapon under jamming is greater than its kill radius for specific targets or three times greater than its guidance accuracy (standard deviation) when there is no jamming. The jamming grades are determined according to the jamming success rate for a number of jamming tests.

Three-Dimension Viscoelastic Analysis and Accelerated Aging Approach to Predict the Service Life of Solid Missile Motor

YUAN Duan-cai, TANG Guo-jin, LI Hai-yang, MENG Shang-yang

2006, 27(4):  685-689.  doi:10.3969/j.issn.1000-1093.2006.04.024

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In order to get the storage life of the solid missile motor, the variation of the extensibility of propellant in the storage period was studied by accelerated aging test and the pattern of Von Mises strain of the grain under internal pressure and axial acceleration loading was obtained using three-di?mension viscoelastic finite element method. Compared the extensibility of propellant with the Von Mises strain of the grain in different storage periods, the storage life of the solid missile motor can be predicted by the maximum Von Misses strain criterion. Above analytical method and the result may be helpful m designing or using solid missile motor.

Reliability Analysis of Location-Scale Parameter Model

HAN Ming

2006, 27(4):  690-694.  doi:10.3969/j.issn.1000-1093.2006.04.025

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the location-scale parameter model, the least-squares estimation and weighed least- squares estimation for the location and scale parameters were given by the expected Bayesian estimation 6f the failure probability. .Accordingly the estimation of product reliability for its life distribution be?longing to the location-scale parameter model was given. Calculations performed on practical problems of an engine show that the provided method in the paper is feasible and easy to operate.

Physical Model of Passive Electromagnetic Armor’s Metal Projectile Acted by Electromagnetic Force

HU Jin-suo, TIAN Liang, ZHENG Ping,XIE Da-gang，CHENG Shu-kang

2006, 27(4):  695-697.  doi:10.3969/j.issn.1000-1093.2006.04.026

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Electromagnetic armor was a new concept of combat vehicle technology, which could im?prove remarkaoiy protective capability and maneuverability of the vehicle. The author raised definitely the issue of applying electromagnetic theory to analyze electromagnetic armor. Based on electromagnet-ics, the projectile’s imposed force expression and physical model of PEMA were established and simu?lated when current flows through the system.

Experiment and Analysis on the Distortion of Cross-section of Bended-tube

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

2006, 27(4):  698-701.  doi:10.3969/j.issn.1000-1093.2006.04.027

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In the series-study of tube-bending-forming, the experiment and finite element simulation analysis, aiming at the phenomenon of wall-thinning and the cross-section shape deformation of the bended-tube, were carried out. Based on the assumption of the plane-stress and three-dimensional stress state, the approximate calculation formulae of the mutual relation between the wall-thinning- ratio and the change-ratio of short axis of the cross-section were deduced respectively. Through bending-experiments, the calculative value of the formula is contrasted and verified. It is proven that the calculative value of the formula based on the assumption of tne plane-stress is relatively accurate. If the relative bending radius is bigger, the radial-deformation of the outer-wall material of bended-tube is smaller. The main reason which leads to the cross-section distortion of bended-tube is the thinning of the outer wall. Although there is a certain deviation in the calculative value of the formula, it can be applied to practice through further amendment with a great number of experiments.

Large Deformation Elastoplastic FEM Analysis of a Nonstandard Disc Spring Used in Separation of Aerocrafts

LIAO Ri-dong, ZUO Zheng-xing

2006, 27(4):  702-707.  doi:10.3969/j.issn.1000-1093.2006.04.028

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Static stresses and deformation of a nonstandard disc spring were elastoplastically investigat?ed using the finite-element method (FEM) . Its load-deflection relationship was presented to study the influence of compression on the stiffness characteristic of the disc spring. The computational results of stresses and load-deflection relationship agreed well with the test results. The computational method applied in this paper can be used to static mechanical analysis of any other disc springs.

A New Method for Unfolding of Ceramic Bearing Ball and Inspection of Its Surface Defects

YANG Tie-bin, WANG Li-qin, ZHENG De-zhi, GU Le, XU Cheng-dong

2006, 27(4):  708-711.  doi:10.3969/j.issn.1000-1093.2006.04.029

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Surface defects in ceramic bearing balls may significantly affect ball strength and reduce rolling contact fatigue lifetime. A surface inspection system composed of optical microscope, digital imaging system and unfolding mechanism has been developed to provide image data for detecting natu?ral defects on the surface of polished Si3N4 balls. The ball surface unfolding model was constructed with a helicoid unfolding method. According to parameters of the imaging system, unfolding control functions were derived and rotating speed control curves were calculated. The influences of control pa?rameters on inspection accuracy and efficiency were analysed to instruct design of control system.

Test Model for Investigating the Residual Strength Degeneration Regularity of Cirankshaft Serving on Bending Fatigue Load

ZHOU Xun，YU Xiao-li, LI Ying

2006, 27(4):  712-715.  doi:10.3969/j.issn.1000-1093.2006.04.030

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Residual strength model is a proper methodology to describe the dynamic fatigue behavior of mechanical component. But it is always difficult to get the residual strength model of some components with complicated structure, such as engine crankshaft. In order to achieve the investigation, an exper?imental residual strength model based on simplified model and dynamic information tracing technology was brought forward. The model is based on modality analysis of the resonant test machine for crankshaft and fracture mechanics analysis of crack expanding behavior. To estimate the feasibility of the method, a simplified quantified study model was also built up according to some experiential knowledge of crankshaft’s fracture expanding characters. A sample investigation using the method was presented at last.

Naval High Pressure Single-phase Water Mist Fire Suppression System

DENG Dong, ZHOTJ Hua, YANG Hua-yong

2006, 27(4):  716-720.  doi:10.3969/j.issn.1000-1093.2006.04.031

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Water mist fire suppression system has the qualities of high efficiency, friendly environment compatibility and low cost. It is the most competitive fire fighting system when used in naval ships. Water mist’s definition, system classification, fire fighting mechanism and advantages are introduced. It is of great importance to employ water mist to replace the Halon fire fighting technique. State-of- the-art water mist fire suppression technology at home and abroad is overviewed. A fixed high pressure single-phase water mist fire suppression system was developed. Water mist electrical insulation and wa?ter mist hanging ability in space were investigated. Tests of water mist suppression on fires were car?ried out. The results show that the system can spray high grade water mist and is able to extinguish class-B fire in less than 50 seconds or class-A fire in less than 180 seconds, respectively.

A Solving Process for Mission Success Probability of Complex Weapon System

LIU Fang, GUO Bo, ZHANG Tao, ZHANG Jian-jun

2006, 27(4):  721-725.  doi:10.3969/j.issn.1000-1093.2006.04.032

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A basic combat unit, namely the smallest military one for a joint combat mission, is composed of a complex weapon system and its support system. A complex weapon system is composed of equipment of many kinds, of which integrity has an important effect on whether the mission of weapon system can be accomplished successfully. Mission success probability is one of important evaluation indexes of maintenance support capacity. Based on solving mission success probability of single-equipment and multi-equipment, mission success probability of weapon system is obtained by mission success logic relation. The practicability of the method is illustrated by a calculated example.

The Damage Reason Location Based on Bayesian Networks

WANG Run-sheng, JIA Xi-sheng, WANG Wei-guo, WANG Run-quan

2006, 27(4):  726-730.  doi:10.3969/j.issn.1000-1093.2006.04.033

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For improving the efficiency and accuracy of damage assessment, it is imperative to carry out the research on intelligence damage location with proper Al technology. Bayesian networks, as one of Al technology, was adopted. The damage location based on Bayesian network was studied and a case was analyzed. It is concluded that the efficiency and accuracy of damage assessment can be im-proved with Bayesian network since it can use as much damage information as possible to locate the damage reason. Also, it is more suitaole to apply Bayesian network to deal with the problem of damage assessment because the bidirectional reasoning can be done with it.

Controller Design for a Class of Nonlinear Networked Control Systems

WANG Yan, CHEN Qing-wei, WU Xiao-pei,HU Wei-Ii

2006, 27(4):  731-736.  doi:10.3969/j.issn.1000-1093.2006.04.034

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Considering a class of nonlinear networked control systems (NCS) to be Lurie systems, a hybrid system is used to describe such a class of nonlinear NCS with network induced delay, data pack?et dropout, etc. A method of controller design and the sufficient condition of the closed-loop system stability were given in terms of a group of linear matrix inequalities (LMIs) . The method can also be used to obtain the maximum transfer interval and the maximum network induced delay upper bound. Simulation result validates the proposed method.

Conclusions Synthesis Method of Multi-diagnosis Agent Based on Evidence Theory

XIAO Xiao-feng, CAI Jin-yan, LI Wen-zhao

2006, 27(4):  737-740.  doi:10.3969/j.issn.1000-1093.2006.04.035

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cooperative solution of multi-diagnosis agent for common task can effectively overcome some disadvantages of unitary diagnosis method or expert knowledge level, but also brings problems about synthesis and appraisement of diagnosis conclusions. In order to synthesize diagnosis conclusions of multi-agent system, the probability distribution function in evidence theory was restrained and reified, according to the characteristics of multi-agent diagnosis results, and the uncertainty function was intro?duced into evidence theory. On above foundation, the result synthesis steps of multi-diagnosis agent were presented, and the validity of this method was explained through analyzing three examples including consistent results, partial conflict results and complete conflict results. The syntheis of diag?nosis results with this method can raise the ability to classify the fault patterns in multi-agent diagnosis system ?

Research on Scene Graph of Virtual Maintenance Training System of Armament

XIE Pu, SU Qun-xing,GU Hong-qiang

2006, 27(4):  741-744.  doi:10.3969/j.issn.1000-1093.2006.04.036

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To remove the limitations of traditional scene graph structure in development of virtual maintenance training system (VMTS), a new scene graph structure is presented. The new scene graph structure is made up of objects, surfaces and polygons. The behavioral characteristics of virtual object, such as attribute information (A ), state (S), event list (E) and behavior (B), are repre?sented by 4-element structure く A, S，E9 B > . The collision between surfaces is implemented by us?ing of the presented scene graph, and constraints involved in collision detection could be recognized and solved. Transition between states of virtual object is described by PetrThet and it is translated into rules, thus causal relation between event and state is defined. Limitations of development of virtual maintenance training system (VMTS) with commercial software could be reduced by the new scene graph structure. Furthermore, collision detection between surfaces in VMTS is realized, and compli?cated maintenance operation could be implemented with characteristics of virtual object.

Optimistic Synchronization Analysis and the RTI Interface Performance Parameter Testing

YAN Hai-rong, ZHANG Ya-chong, SUN Guo-ji,ZHONG Lian-jiong

2006, 27(4):  745-749.  doi:10.3969/j.issn.1000-1093.2006.04.037

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After analysing the optimistic synchronization implementation in HLA(high levelarachitec- ture), the RTI(run time infrastructure) interface performance parameter was calculated. During the analysis, it is discovered that the event processing method, restoration and storage methods are still the control point of the simulation time. In conclusion, when using the optimistic synchronization in HLA, the simulation time increases, and the Rl I interface performance parameter remains one of the factors. The statistic mean of KD-RTI interface performance parameter was measured by simulating.

Comprehensive Reviews

A Study on the Structure and Strength of Composite Flywheel

QIN Yong, XIA Yuan-ming

2006, 27(4):  750-756.  doi:10.3969/j.issn.1000-1093.2006.04.038

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A composite flywheel system incorporates the use of new material technology, magnetic suspension technology and high-speed reversible electrical engine techonlogy available today. It is enabled to adopt enormously concentrated energies in their various forms, and has attracted the attention of sci-tech authorities in many lands. Yet there remain unsolved many theoretical problems concerning, the systemic and integrated design of structure and strength of composite flywheel. The progress in these areas of the study are given in generalized terms together with some suggestions.

Experimental Techniques and Analysis

Development of a Ytter Dium Foil Stress Sensor and Its Experimental Research

YU Shang-jiang, YANG Ji-xiang，LI Ke-jie

2006, 27(4):  757-761.  doi:10.3969/j.issn.1000-1093.2006.04.039

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In order to measure the stress in the rock and concrete structure under impulsive load during blast of ammunition or penetration of projcctilc, a ytterbium foil stress sensor was developed. The working principle of the sensor was analyzed, the machining technology of the ytterbium sensing ele?ment was developed and the structure of the sensor was reasonably designed. By experimental research, the sensor is testified to have many merits such as low transverse sensitivity coefficient, wide measuring range, great capability of bearing over loading, high frequency response, simple structure, convenience to use, and so on. The sensor can be widely applied to the stress measurement in concrete or rock under shock load.

A Study on Catalytic Kinetic Spectrophotometry of V( V)—( DBS—Arsenazo) —KBrO3 System

ZHAI Qing-zhou, ZHANG Xiao-xia, YU Hui,WANG Hao, CHEN Li-Ii

2006, 27(4):  762-764.  doi:10.3969/j.issn.1000-1093.2006.04.040

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In 6.80 X IO-3 ?2.72 X 10-2 mol·L—1 of phosphoric acid medium and in the presence of citric acid, trace vanadium(V) can catalyze the decoloring reaction of DBS-arsenazo oxidized by potas?sium bromate. Based on this, a new catalytic kinetic spectrophotometric method for the determination of trace vanadium was developed. The results show that the apparent molar absorptivity of the system is ε522nm = 2.70 X IO6 L·mol-1 ? cm-1 at 522 nm. The linear range of the method is 0?20 μg? L-1. The detection limit of the vanadium is 10.6 ng·L-1. The method is applied to the determination of the vanadium in water sample with satisfactory results.

Research Notes

Study on Aligning and Detecting of Large Shaft Center-Line with PSD and Laser Technology

CAO Guo-hua, STJ Cheng-zhi, XU Hong-ji

2006, 27(4):  765-768.  doi:10.3969/j.issn.1000-1093.2006.04.041

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A new method for large shaft alignment was proposed based on visual laser technology and PSD (position sensitive detector) technology. The benchmark beam of light is generated by semicon?ductor laser and received by light targets with PSD. Finally the measure of shaft center-line alignment is finished by optimum algorithm. Through simulation experiment, it is comfirmed that the detecting principle is correct and the method has some advantages such as quick and easy operation, reduces wear and tear of large shaft and offers a new idea for shaft calibration and detection.