Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.     

Analysis of Unsteady Supercavitating Flow Around a Cone Cavitator

Based on an integral equation method, the unsteady supercavitating flow around a slender cone cavitator is studied. The shape and length of supercavity is calculated respectively by using a finite difference time discrete method. Their characteristics varying with the cone angle and cavitation number are investigated respectively. It can be seen obviously that the change of supercavity is characterized by retardation and waviness.     

Research on First Attack Probability Model of an Attacker Level Bombing Anti-air Radars

The paper mainly studies the first attack probability （FAP） of an attacker level bombing anti-air radars through analyzing the radiant point orientation and attack （RPOA） process of attackers. Firstly, the searching target process is analyzed, and a corresponding target finding model is brought forward. Secondly, the target approaching process is concretely analyzed when the attacker levelly bombs the anti-air radar, and a corresponding target approaching model is presented. Finally, a demonstration is given to analyze the major factors in the model and prove its validity.     

Target Detection in the Presence of Reverberation Based on SVD Method

Target echo detection in the presence of strong reverberation is investigated by means of singular value decomposition （SVD） method. Simulation results indicate that the method can efficiently separate the target echo from the reverberation and can improve the detection of target echo.     

Determination of Muzzle Velocity Loss by Bore Wear Pattern

A method to determine muzzle velocity loss according to the actual measured bore wear pattern is proposed.Therefore, it is unnecessary to conduct live firing and other experiments for determination of muzzle velocity loss. It has been applied to a national military standard since July 1, 2004.     

A Study on the Implementation of Visualization for a Virtual City

With the development in network communication, the research and application of ＂virtual city＂ has become an important discussion item. The crucial point lies on how to set up a virtual visual model of city on Internet; it is the organic integration of computer science, information science, geosciences and system science. This text summarizes the basic conception of ＂digital earth/the virtual fictitious city＂, and probes into the technology of combining with Web on the basis of 2DVR, 3DVR and GIS. It develops the new emulation mode of the virtual urban system and key technology while developing the scheme wholly. This paper offers the interactive methods of the virtual world and outside world. The method of using the panorama, three dimensional model and active server pages technology to realize interactive network virtual city roam is studied and a running example is given. Using the system we can offer the visual brand-new technical support for urban planning, traffic for tourism, etc.     

LNN Blind Multi-user Detection Algorithm for Multi-path-fading CDMA Channels

A blind multi-user detection algorithm （BMUD） which is suitable for multi-path-fading Channels based on Lagrange neural network （LNN） is proposed. Based on the minimum output energy （MOE） criterion, the blind detection algorithm is formulated as a constrained optimization problem inherently and is then resolved efficiently using the neural network . Compared with the previous RLS（recursive least squares ）-MOE blind detection algorithm or for multi-path channel, the BMUD based on LNN has better performances： lower computational complexity, faster convergence speed and capability in the multi-path-fading channel. The bit error rate （BER） and signal-to-interference-and-noise ratio （SINR） performances of the detection algorithm in multi-path channel are close to that in single path channel.     

Threat Assessment of Targets Based on Support Vector Machine

In the context of cooperative engagement of armored vehicles, the threat factors of offensive targets are analyzed, and a threat assessment （TA） model is built based on a support vector machine （SVM） method. The SVM-based model has some advantages over the traditional method-based models： the complex factors of threat are considered in the cooperative engagement; the shortcomings of neural networks, such as local minimum and ＂over fitting＂, are overcome to improve the generalization ability; its operation speed is high and meets the needs of real time C2 of cooperative engagement; the assessment results could be more reasonable because of its self-learning capability. The analysis and simulation indicate that the SVM method is an effective method to resolve the TA problems.     

Numerical Simulation of High Performance Shaped Charge Penetrating Concrete Targets

Tandem warhead systems consist of a precursor shaped charge and a following kinetic energy projectile containing high explosive filling. This paper presents a numerical simulation analysis of the penetration forming and the process in which the shaped charge penetrated into concrete targets by using AUTODYN software. The shaped charge is consist of different materials, different standoff, different liner curvature and thickness. Parameters for the liner structure which can detemine ideal aperture and penetration depth are acquired. The simulation results are in agreement with them of the experiment.     

以环状硝胺为基的几种塑料黏结炸药的初步研究

用聚异丁烯(PIB),丙烯腈-聚丁橡胶(ABR),维通A黏结剂和RDX,HMX,BCHMX和ε-HNIW四种硝胺炸药制备了一系列塑性炸药.PETN和以PETN为基的三种塑性炸药用于比较.测试了这些炸药的爆速,撞击和摩擦感度.摩擦感度与撞击感度的关系以及两种感度与D<'2>的关系表明摩擦力向硝胺炸药分子反应中心的转移机理...     

硝基甲烷的爆轰温度研究

为了准确测定高能炸药的爆轰反应温度,深入研究了高能炸药的爆轰辐射特性,采用瞬态辐射光纤高温计测量了液体炸药硝基甲烷的爆轰辐射光谱。以黑体辐射普朗克公式为基础,运用线性最小二乘法进行拟合,获得硝基甲烷炸药的实测爆轰温度为（3 552±17）K。同时,用VLW爆轰程序计算获得液体炸药硝基甲烷的理论爆轰温度为3 681 K,计算值与实测值和文献值比较接近。