Acta Armamentarii

Research and Development of Engine- Generator Set Control System for Tracked Vehicle Electric Drive System

HUANG Ying, CUI Zhao-wei, SUN Feng-chun, LIU Bo-lan, HUANG Qian

2007, 28(1): 1-6. doi:10.3969/j.issn.1000-1093.2007.01.001

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The engine-generator set is an energy generating equipment which supplies power to the electric transmission, so the control of the engine-generator is one of the key technologies of electric transmission. Based on the discussion on the function of engine-generator set in an electric transmis-sion, the detailed function of engine-generator and the control strategy were established. The hardware and software of the control system were also developed. The experiment on a prototype vehicle was conducted. And the preliminary results indicate that the design of the engine-generator control system can satisfy the power requirement of vehicle in all of vehicle operating conditions, and the control sys-tem has a good responsibility.

Determination of Muzzle Velocity Loss by Law of Bore Wear

LIU Yi-xin, Wang Gui-yu

2007, 28(1): 7-9. doi:10.3969/j.issn.1000-1093.2007.01.002

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A method was put forward, of which the actual law of bore wear and its corresponding muz-zle velocity loss was obtained by simulating the law of bore wear, its corresponding muzzle velocity loss and weighting coefficient. Therefore, it is unnecessary to conduct live iirmg and other experiments for the method. It has been applied to the army units as.the national military standard since July I, 2004.

Dynamics Model and Simulation of Rigid and Flexible Coupling System for Terminal-sensitive Submunition

GUO Rui, LIU Rong-Zhong

2007, 28(1): 10-14. doi:10.3969/j.issn.1000-1093.2007.01.003

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A dynamics model of the rigid and flexible coupling system for a terminal-sensitive submuni-tion was set up 'with Kane’s method. I he parachute was considered as a flexible body, the flexible dis-placement and position of parachute were expressed in terms of a modal spread method and a hybrid co-ordinate method, respectively, and the kinematics of terminal-sensitive submunition was analyzed. Ten generalized coordinates relative to the poses of terminal-sensitive submunition were chosen, partial velocities were cited, and the correlative generalized active forces, the generalized internal forces and the generalized inertial forces were deduced respectively. On the oasis of the Kane’s method, the ten degree of freedom dynamics equations for the coupled terminal-sensitive submunition were finally set up. Based on above mentioned equations, the ballistic results were' computed with MATLAB. This model can be used for expediently simulating and accurately analyzing the exterior ballistic of terminal- sensitive submunition, and providing the overall design of terminal-sensitive submunition with some helpful references.

A Research on an Automatic Fuze Failure Analysis System Based on Dynamics Simulation

LU Wei-jie, RUI Xiao-ting, LU Wen-guang,HE Bin

2007, 28(1): 15-19. doi:10.3969/j.issn.1000-1093.2007.01.004

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An automatic fuze failure analysis system based on dynamics simulation was established, in-tegrating the nonlinear optimization and random simulation with multibody launch dynamics and fuze mechanics dynamics. In this system, a numerical simulation of some fuze can be done for studying the dynamical characteristics of fuze mechanism in various ballistic environments, and the iailure possibility of the fuze can be analyzed automatically. This system has been successfully applied in a case of fuze failure. An available automatic analysis tool was provided for fuze failure analysis.

The Byproducts and Mechanisms of Nitrolysis of Tetraacetyldiformylhexaazaisowurtzitane

CHEN Shu-sen, SHU Qing-hai, JIN Shaohua, SHI Yan-shan

2007, 28(1): 20-22. doi:10.3969/j.issn.1000-1093.2007.01.005

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The studies of the nitrolysis of tetraacetydiformylhexaazaisowurtzitane in concentrated nitric acid and complex acid of nitric and sulfic acid were separetely made. The main products of nitrolysis of TADF m the two medium systems are both hexanitrahexaazaisowurtzitane. By use of colum chromato-graphy methods, two different nitration by-products obtained from the two medium systems were iso-lated, the former is monoacety lpentanitrohexaazaisowurtzitane and the latter is mono- formylpentanitrohexaazaisowurtzitane. It is shown that reaction mechanisms of nitrolysis of TADF m concentrated nitric acid and complex acid of nitric and sulfic acid are different.

Simulation and Research on Missile Erecting System

YAO Xiao-guang, GUO Xiao song, FENG Yong-bao,GAO Qin-he

2007, 28(1): 23-27. doi:10.3969/j.issn.1000-1093.2007.01.006

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In order to study the dynamic characteristics of missile erecting system, the system is con- siderea as a rigid-flexible coupling system. An equivalent and simplified system was firstly abstracted from the system, and the stress analysis was carried out. Then the rigid-flexible coupling dynamic sim-ulation of the erecting system was accomplished by joint simulation of system simulation softwares. Research on kinematic and dynamic characteristics of the flexible body was carried out using the simu-lation results. Some conclusions which are valuable to the design and optimization of missile erecting system were obtained.

Interaction-terramechanics of Vehicles on Mechanized Road Equipment

FAN Hua-lin, LIU Fu-jun, GAN Zhi-hai

2007, 28(1): 28-32. doi:10.3969/j.issn.1000-1093.2007.01.007

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To predict the trafficability of tires on mechanized road equipment , the main structures of military mechanized road equipment; and the corresponding terramechanics behavior were discussed. Two failure modes including the U style sinkage mode and the V style sinkage mode were suggested. An energy method was proposed to judge the: trafficability. The drawbar pull work of U and V sinkage modes were computed and compared by defining the difference between the driving work and the resistance work. Thus the critical width of road beams were suggested. The influences of sinkage, adhesive coefncient and pressure-sinkage parameter were discussed. And the restrictions on sinkage, adhesive coefncient and pressure-sinkage parameter were suggested. Due to the consistency between the theoretical prediction and test, the energy method is effective to engineering practices.

A Measuring Method for Velocity of Warhead Fragments

NI Jin-ping, YANG Lei

2007, 28(1): 33-37. doi:10.3969/j.issn.1000-1093.2007.01.008

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For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method was proposed, in which a six-light-screen array, a location identifying board, a multi-channel chronograph, and a computer are used. A principle of measurement is described. The key of the system is a light screen array sensor which consists of six light screens with a certain geo-metrical parameters. When the fragment flies through the light screen array, the time when it passes through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location can be calculated im- meaiately. The method presented can be used to locate the fragment and to measure the velocity that is the real velocity on the fly orientation of fragment. It can be also used for measuring velocity of frag-ment group after further research on engineering.

Meshing Analysis of Torpedo Cylindrical Cam Motor with Inclining Rollers

CHEN Yi-hui, WANG Shu-zong, LIAN Yong-qing

2007, 28(1): 38-41. doi:10.3969/j.issn.1000-1093.2007.01.009

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The torpedo cylindrical cam motor with inclining rollers was studied. The meshing theory of ?conjugate curved surface was used to analyze the curved surface equation, the contact angle equation and the equation of relative normal curvature. The research result of validated by an example can pro-vide a theoretic basis for designing and manufacturing this type of motor.

A Research on Data Processing Method for Multiple Sets oi Data from the Same Test

CHEN Wei-dong, LIU Xu-hua, SUN Yi

2007, 28(1): 42-45. doi:10.3969/j.issn.1000-1093.2007.01.010

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In allusion to the multi peak phenomenon occurring at fitting the probability density function of many test data from the same random test, a data processing method was presented based on the statistic character of the probability density function mainly determined by position, scale and form pa-rameters, The probability density function was fit using the maximum entropy method, and all the statistic characters of test data were received. The correctness of the method was validated.

A study of Mission Accepting Strategy of Development Organization Based on Benefits Optimization

SHI Xian-ming, LIANG Liang, GUO Bo

2007, 28(1): 46-51. doi:10.3969/j.issn.1000-1093.2007.01.011

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Benefits optimization is one of the most important problems to a development organization. Development organizations hope to accept more development missions to gain more profits ? Much more accepted missions may be delayed due to limited resources in the development activity, which leads to huge economy loss. The mission accepting strategy was studied by establishing a queuing network model of development organization, which depends on alternative upper limit of the missions in the first process at the moment of new mission arrival. A solution was also given for the model. The deci-sion-making approach is simple operationally and suitable for the system, of wmch service ability dif-ference between the first and the key processes is not great. An example was given to demonstrate the approach.

A Computation Method for Thermal Field of Permanent Magnet Retarder in Automobile

HE Ren, ZHAO Wan-zhong, HU Qing-xun

2007, 28(1): 52-56. doi:10.3969/j.issn.1000-1093.2007.01.012

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A physical model based on the construct and operating principle of permanent magnet re- tarder for analyzing the non-stationary thermal field of retarder rotor in automobile was estabnsned, and the boundary conditions were defined. A formula of the non-stationary thermal field was derived using the Laplace transformation. At last, a bench test was performed. It is found that the testing da-ta is coincident with the analytical one. The non-stationary thermal field can be analyzed and an exact relation can be reflected by this formula. The rotor can be optimized and the temperature rise of the ro-tor can be decreased, so the brake performance stability can be improved by this research.

A Study of Relation between Execution and Survivability in Air- to- Ground Strike

SU Chang, ZHANG Heng-xi, WU Zhao-qiang

2007, 28(1): 57-62. doi:10.3969/j.issn.1000-1093.2007.01.013

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The indexes of a and p charactering execution and survivability were ascertained. Their in-herent relation was also analyzed, and a mathematic model was established. The three complex index- es-mission success probability, target killed probability and aircraft killed probability were optimized. The mission success probability sensitivity to execution and survivability was analyzed.

Reliability Assessment and Experimental Design Based on Hypothesis of Log-normal Distribution

ZHANG Shi-feng, ZHANG Hong, LIU Ting,QIAN Shan

2007, 28(1): 63-67. doi:10.3969/j.issn.1000-1093.2007.01.014

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System reliability assessment and experimental design methods are proposed. Under the hy-potheses of log-normal distribution of system prior reliability, confidence lower-bound of system relia-bility can be obtained by taking full advantage of component test information and system configuration. Three sensitivity indices are presented to analyze the impact of component- level test data on system- level reliability. These indices .provide rich information for assessing system reliability improvement strategies. The simulation example shows that the method is reasonable.

A Research on the Precision Forming Technology and the Machining Fixture for Semi-axle bevel Gear in Automobile

WU Tai-bin, REN Guang-sheng

2007, 28(1): 68-72. doi:10.3969/j.issn.1000-1093.2007.01.015

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A new precision forming technology was presented, which uses an ordinary forging machine and a high precision rotary forging machine to make the closcd-tolerance semi-axle bevel gear forgings. A series of key technical issues were researcljied, including blank shape in forming step, process param-eter of forming process, structures of forging die and machining fixture, etc. The closed-tolerances and high strength of gear teeth, fine quanlity of meshing, high life time of dies, high availability of materi-al, lower cost and massive production are achieved by using the forming technology.

A New Matrix Algorithm of Three-point Method Roundness Error Separation Technique

LEI Xian-qing, LI Yan, ZHOU Yan-wei,LI Ji-shun, XUE Yu-jun

2007, 28(1): 73-77. doi:10.3969/j.issn.1000-1093.2007.01.016

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Through the analysis of three-point method roundness error separation technique and based on the invariability and the periodicity of the geometrical characteristic of the measured round contour, a new matrix algorithm which can be used to solve the roundness error of the measured round profile directly without Fourier transform was presented. Based on the research and analysis on the rotation error motion, wmch be separated by three-point method, mathematical formulas were derived in detail which can be used to separate eccentric motion of least square center of the measured round contour and pure rotation motion error of spindle in rotation motion. The correctness of this method was validated by means of the simulation.

A Study on Quadratic Effect Assessment Method of Military Aircraft Under Multiple Hit

HOU Zhi-qiang, MENG Wei-jie

2007, 28(1): 78-82. doi:10.3969/j.issn.1000-1093.2007.01.017

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The aircraft vulnerability assessment method was proposed by means of kill tree diagram and state transition matrix, under the conditions of multiple hit and counting quadratic effect, in four in-stances of the quadratic effects between components of nonredundant to nonredundant, nonredundant to redundant, the redundant to nonredundant, redundant to redundant. And the application of above mentioned methods to the calculation of the quadratic effect was studied.

Statistical Analysis on Human Reliability of Armored Equipment

LIU Wei-ping, CAO Wei-guo, YANG Li-qiang, JIN Li-ya

2007, 28(1): 83-86. doi:10.3969/j.issn.1000-1093.2007.01.018

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Man-made errors found during the course of testing and operating for seven types of armored equipment were statistically analyzed and the reason for causing the error was presented. Based on this, the distribution character of man-made errors and the ratio between man-made errors and ma-chine failures for man-machme system were developed. Additionally, the man-made error ratio and hu-man reliability were calculated for six types of armored equipments.

A Research on Wideband Underwater Acoustic Signal Processing Based on Mellin Transform

WANG Jun, LI Ya-an

2007, 28(1): 87-90. doi:10.3969/j.issn.1000-1093.2007.01.019

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According to the features of wideband underwater acoustic signal, a solving method of wide-band ambiguity fuction based on Mellin transform was put forward and the wideband signal processing based on fast Mellin transform algorithm was studied. Theoretical analysis and simulation indicate that this algorithm not only implememts efficiently but also has good concentration in wideband ambiguity domain, so it is very suited for online processing of wideband underwater acoustic signal.

The Design and Implementation of the Test Flow Description Language

MENG Chen

2007, 28(1): 91-93. doi:10.3969/j.issn.1000-1093.2007.01.020

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In order to satisfy the requirement to describe the test flow, the test flow description Ian- guage(TFDL) was designed. In this paper, the design concept, composition, program structure and the sentences’ syntax structure are presented. The development of the implementation system for tjie language was completed. The language possesses portability, hardware independence, expansibility, compatibility and simplicity, makes general ATS software met by the needs of portability and repeati- bility of TPS, simpifies software developing process greatly and reduces software maintenance difficul-ty greatly.

Damage of al-whipple shield Rear Wall Caused by Hypervelocity Impact of Al-spheres

GUAN Gong-shun, PANG Baojun, HA Yue，GAI Fang-fang, ZHANG Wei

2007, 28(1): 94-101. doi:10.3969/j.issn.1000-1093.2007.01.021

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All spacecrafts in low orbit are subject to hypervelocity impacts of meteoroids and space de-bris, which can in turn lead to its significant damage and catastrophic failure. An investigation into the impact damage characteristics has become an important problem for spacecraft protection design. The damage characteristics of the hypervelocity impact of Al-spheres to the rear wall of Al-Whipple shield were studied by the methods of experiment and numerical simulation. By comparing experiment data with numerical simulation results from AUTODYN—2D, it is found that the former is consistent with the latter fully. The impact damage law of rear wall of Al-Whipple snield by hypervelocity impact of Al-spheres with the projectile diameters, impact velocity and protection space was analyzed, and the leading factors which affect the damage of rear wall were proposed.

The Advance of Research on Co-design of Control and Scheduling for Network Control Systems

WANG Yan, CHEN Qing-wei，FAN Wei-hua, HU Wei-Ii

2007, 28(1): 102-106. doi:10.3969/j.issn.1000-1093.2007.01.022

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For the limited network resource competition, recent scheduling methods of network control systems (NCS) are presented respectively and their characteristics are also discussed. Especially, to improve the synthetical performance of NCS, some new approaches to NCS control and scheduling co-design are proposed to solve the conflicts between control and scheduling performances. Considering the disadvantages of the existing studies, some suggestions of the new research tendency are proposed.

Finite Element Analysis of Mainframe Structure of a Special Vehicle

SHAO Peng-Ii, XIA Bin

2007, 28(1): 107-110. doi:10.3969/j.issn.1000-1093.2007.01.023

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The finite element (FE) analysis of structural strength and stiffness for a special-purpose ve-hicle was proposed. A turret on the vehicle body can rotate round its seating, and has a special con-straint relation with the body. So the FE analysis is traditionally a large-scale nonlinear contact prob-lem. It is time-consuming to solve it. In order to solve the problem, the DOF coupling method was used to simulate the mechanical characteristics of ball bearing between the vehicle body and its turret. Thus, the mechanical properties oi the whole vehicle structure were truly simulated using the body and turret as a system. The vehicle is subject to the following working loads ： recoil forces from different angles which the turret is subject to and road obstacle impact with an acceleration of 1Og which the whole vehicle is subject to. From the analyzed results, it is concluded that the static strength of struc-ture is satisfactory, and a theoretical basis is provided for weight-reduction design. The present method is effective, and can also be applied to other similar large contact problems.

Implementation of Simulated Signal Source for Four-element Infrared Seeker

YU Jin-song，HAO Wang-song, FEI Yu-hua, JIANG Wei

2007, 28(1): 111-114. doi:10.3969/j.issn.1000-1093.2007.01.024

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To satisfy the need of hardware-in-the-loop simulation of four-element infrared seeker, a method of dynamic infrared scene generation based on direct signal injection was proposed. Infrared scene signals generated by model calculation are composed of target movement, release of jamming pro-jectile and complex background of sky or ground. The signals are directly injected into the electronic cabin of seeker for verification and modification of the tracking and anti-jamming algorithms, without a complicated target simulator consisting of black body, turntable, and optical system. The dynamic infrared scene generation techniques based on the four-element infrared guidance principle and the modeling of infrared scene were investigated. Moreover, the implementation of actual simulated signal source was given to prove the feasibility of method.

A Study on an Interface Between CAD Model and Geometry Description Model of Materiel

LIU Xiang-kai，TANG Yan-feng，WANG Jia-ning,LI Hui-mei

2007, 28(1): 115-118. doi:10.3969/j.issn.1000-1093.2007.01.025

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Low modeling efficiency and lack of precision are common problem in current used Geometry Description Modcl(GDM) of materiel. The route to apply the CAD models of materiel to GDM was in-vestigated, an interface between CAD model and GDM was presented, the basic functions, basic logi-cal flow and implementation techniques of it were analyzed, a simple computer program was also pro-grammed, and the basic function of data conversion was accomplished, an application to a transmission of an automobile was also carried out. I he result presents that it is feasible to improve the modeling ef-ficiency of GDM of materiel through the research of a data interface between the CAD model and GDM，it can provide effective support for the modeling ot uDM, and it lays a foundation for the devel-opment of a practical data interface.

Design and Implementation of Equipment Interactive Electronic Technical Manuals

YANG Yu-hang, LI Zhi-zhong, ZHENG Li

2007, 28(1): 119-121. doi:10.3969/j.issn.1000-1093.2007.01.026

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Interactive electronic technical manuals (IETM) can significantly improve the maintenance and logistics of modern weapon equipments. Main functions and development strategies of IETMs are discussed in this paper. As an example, development and interfaces of the IETM of a certain equip-ment is demonstrated.

A Study of Structure Characterization and Thermal Decomposition of the Impurities ot HNIW

LIU Jin-quan, OU Yu-xiang, WANG Yan-fei, MENG Zheng, WU Xiang-guo

2007, 28(1): 122-124. doi:10.3969/j.issn.1000-1093.2007.01.027

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HNIW was respectively synthesized with TADBIW by use of a sub-nitrolysis/ mtrolysis one- pot method and with TADFIW by use of a mixed acid method. The main impurities of HNIW were separated using a column chromatography and confirmed as PNMAIW and PNMFIW via FTIR， 1H NMR, MS and element analysis. The DSC and kinetics calculations show that the initial and peak decomposition temperatures of PNMFIW are higher than those of PNMAIW and the apparent decom-position active energy of the former is twice as much as that of the latter. The reason maybe is that the formyl on the hexabasic ring is more stable than the acetyl on the pentabasic ring to the cage structure for FNIW with one substituting group.

Designing and Implementing of a Missile's Visual Simulation System Based on OpenGL

GAO Ying, HUANG Luo-jun, XU Zhi-guo,HUANG Jian-guo

2007, 28(1): 125-128. doi:10.3969/j.issn.1000-1093.2007.01.028

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A missile visual simulation system was designed by OpenGL and the flight path and flight attitude in different status of the missile were displayed vividly. The establishment problems of the 3D scene were presented including construction and redeployment of a model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile’ s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. A missile flight simulation results and the effect of the scenes were given.

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