多管火箭发射车动力学仿真研究

介绍了多管火箭发射车在火箭发射过程中的动力学仿真研究情况,包括详细的模型简化方法、模型的ADAMS描述、仿真过程控制。应用ADAMS软件对多管火箭发射车的多种发射情况,如：不同发射角度、不同发射顺序、不同发射间隔等,进行实时仿真分析,获取发射车系统的模态参数,运动机构的运动特性和约束的约束反力等。     

基于射击稳定性的车炮匹配参数分析

车炮匹配性是装甲车辆总体性能的重要组成部分之一.以某坦克炮的虚拟样机发射过程系统的射击稳定性仿真为基础进行了车炮匹配参数分析.为正确预测火炮系统主要部件的运动和受力规律,研究车炮匹配性评价在火炮系统射击过程的参数影响,建立了火炮系统的多刚体动力学模型.仿真计算结果表明火炮射击时,火炮和车体组成的系统做幅度较小的周期运动或衰减运动,系统具有可靠的运动稳定性和安全性.     

倾斜零长发射技术研究

利用虚拟样机技术(VPT)建立了飞行器零长发射过程的动力学仿真模型.详细论述了飞行器发射系统的组成、模型简化和动力学仿真的研究方法.对不同工况下的发射过程进行动力学分析,获取了飞行器发射阶段的姿态参数和发射车的稳定性,验证了飞行器零长发射的可行性和安全性.     

发射舰机动对舰载导弹离轨参数的影响研究

考虑发射舰的行进速度和摇摆运动对舰载导弹离轨参数的影响，对舰载导弹发射运动进行了仿真，求出了对导弹自控段终点散布有重要影响的导弹滑离参数，得出了发射舰运动对导弹发射时初始状态的影响规律。最后分析了发射舰机动对舰载导弹飞行弹道的影响。     

舰艇运动对鱼雷发射入水参数影响

舰艇运动对舰载鱼雷发射有较大影响。为了分析舰载鱼雷发射的入水参数,对舰载鱼雷发射入水参数的影响因素进行了研究,综合考虑了舰摇、舰速、发射管转角及鱼雷发射时舰艇姿态对鱼雷入水参数的影响,建立了鱼雷发射入水参数的数学模型,并分别对舰艇运动发射过程与静水中发射过程进行了仿真计算。仿真结果表明,舰艇运动下的鱼雷发射模型能更真实的反映鱼雷发射情况,为舰载鱼雷发射的研究提供参考。     

考虑惯性效应的移动弹丸作用下身管振动特性

为研究火炮发射过程中弹丸激励下的身管振动特性,建立了弹丸膛内运动冲击作用下考虑其惯性效应的身管横向振动方程,采用小参数解法,给出了方程级数形式的解析解.针对弹丸有、无质偏2种工况,对不同运动参数下身管的振动特性进行了数值仿真.讨论了不同运动参数对炮口处的振动影响规律,并给出了定量分析结果,探究了弹丸连发激励下的炮口振动...     

正交车铣切屑仿真的研究

本文简要介绍了正交车铣运动的矢量方程,给出了正交车铣切屑仿真的数学模型,阐述了切屑形状的计算机仿真原理,并得到了不同工艺参数下切屑的仿真结果.分析了不同工艺参数对正交车铣切屑形状的影响,并得到偏心量取|e|=r-lns时对切削较为有利.     

基于运动仿真的导弹发射车故障知识获取研究

为解决智能诊断专家系统知识获取的“瓶颈”问题，用机械制造与设计软件PRO／E Mechanism模块对某型发射车建模．利用装配模块将其安装，进行运动仿真，获得了导弹发射车的发射程序过程的可视化资料及其运动．故障之间的对应关系，为建立智能诊断专家系统知识库提供了一个新的思路．     

导弹发射条件对初段飞行性能的影响分析

以导弹箱式发射方式为例,推导出了四段运动方程式,求出了对应于不同情况下导弹运动参数的变化规律，研究了导弹从助推器点火到导弹加速到给定飞行速度这一过程的飞行特性，分析了导弹出箱初始条件的变化和对导弹飞行性能的影响。仿真结果表明，该理论模型和发射条件对初段飞行性能影响的分析是合理的。     

某新型自动发射系统动力学仿真研究

为了探索武器设计参数对自动机运动特性的影响,以某新型自动发射系统为研究对象进行模拟和动力学仿真研究。在已有三维模型的基础上建立该系统的多刚体动力学模型,运用 ADAMS 软件,对自动机的运动学和动力学进行仿真,验证自动机动作的可靠性;根据本发射装置曲直兼容、点面杀伤及枪管双向缓冲等特点,分别建立发射2种不同弹药(穿甲弹和榴弹)和有无前冲击发的工况模型,分析自动机运动特性,验证其兼容发射特性;通过改变设计参数值,得出参数变化对自动机运动的影响规律。结果表明：武器设计参数对自动机运动规律的影响并不成特定的规律,设计者需综合分析各参数变化对其运动特性的影响,寻求最佳参数匹配方案。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

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.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

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.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.     

A Study on the Estimation of Aeroheating upon the Warhead Nose at Supersonic Speed

An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD （computational fluid dynamics） and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.     

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.