基千APDL的自动武器复进簧参数化建模与优化设计

采用ANSYS参数化设计语言对某自动武器复进簧进行参数化建模和优化设计。前者先定义复进簧的设计变量，确定其结构参数。再确定其目标函数、状态变量。后者利用APDL参数技术和ANSYS命令创建参数分析文件，用于优化循环分析文件，再进入优化设计器OPT执行分析过程，最后检验优化设计序列。将ANSYS优化结果与Matlab优化结果相比较。结果表明该优化设计有效。     

高速飞行器复合材料隔热层参数化设计

以航天飞行器的复合材料隔热层为研究对象,提出了基于遗传算法和有限元(FEA)参数化分析的优化设计方案.其中,以遗传算法为优化方式,基体材料层、隔热材料层、耐烧蚀陶瓷层的厚度为设计参数,隔热层的组合厚度及各层热应力为优化目标;优化过程中调用ANSYS软件对种群中个体进行有限元参数化分析,并将分析结果返回遗传算法程序中构造...     

多股复进簧设计分析一体化技术研究

为改进传统的多股复进簧设计流程,研究了多股复进簧设计分析一体化技术。通过对多股复进簧数学模型、参数化建模方法以及自动化仿真流程的深入研究,运用C#编程语言结合UG二次开发技术开发出多股复进簧结构参数设计与计算校核程序、参数化建模和仿真分析等基本功能模块,并对各功能模块进行集成,开发出多股复进簧设计分析一体化模板。该模板能够对不同型号的多股复进簧进行快速设计和分析,并通过具体实例对一体化技术的可行性进行了验证。结果表明,应用一体化技术能够使设计人员快速完成多股复进簧设计,可大大缩短产品研发周期,对提高其他产品的设计效率也具有一定的参考价值。     

应用ANSYS进行天线罩几何建模方法探索

为解决在天线罩强度分析过程中重复繁琐的几何建模工作，利用ANSYS／Mechanic结构分析软件提供的高级参数化编程语言，采用参数化方法创建通用的天线罩几何建模程序文件。该文件为命令形式的文本文件，尺寸小，便于携带、更改并可重复使用，可替代庞大的数据库文件，便于对天线罩强度设计进行优化分析。     

基于改进粒子群优化算法的末修子母弹总体参数优化设计

将末修子母弹对跑道封锁能力的评价指标作为优化设计的目标函数,确定了需要优化的总体参数,并利用改进的粒子群优化算法建立了总体参数的优化模型.在优化设计中,通过对总体参数的离散化提高了优化计算的效率,分析了跑道长度对最优总体参数的影响,获得了针对不同长度的跑道均具有较强封锁能力的总体参数最优搭配.研究成果对于末修子母弹总体方案设计以及子弹外弹道设计具有重要的参考价值.     

基于有限元方法的液体火箭发动机机架优化设计

采用ANSYS有限元分析软件提供的优化方法对液体火箭发动机机架的优化问题进行了分析,提出了机架优化设计的一般流程,使用ANSYS的APDL语言编写了机架优化设计分析程序,通过对优化程序的研究,获得了某型号发动机机架的最优化结果,优化后的质量比初始设计质量大大的减轻.     

级间段结构优化设计分析

为使飞行器的级间段结构质量最小,对其进行结构优化设计.利用 ANSYS 软件建立级间段模型,并对该结构进行强度分析,对级间段的各结构参数进行灵敏度分析,用 APDL语言编制级间段优化程序,并采用零阶优化算法进行优化设计,最终实现了轻量化目的.     

超高射速自动机缓冲装置参数优化设计方法

针对超高射速自动机射击时由于后坐叠加而导致后坐力剧烈增加的问题,为减小后坐力,以某超高射速自动机为研究对象,对所确定的缓冲装置方案,应用优化设计的方法,建立了缓冲装置的优化设计模型,通过求解得到了优化的缓冲装置结构参数,并对优化参数下的缓冲性能进行了仿真分析.分析结果表明,采用所确定的缓冲装置方案和优化的结构参数,射击时的后坐力得到了大幅度降低,说明所确定的缓冲装置方案和采用的优化设计方法是有效的,可以用于指导超高射速自动机缓冲装置的设计.     

Pro/E在机械结构分析中的应用

Pro/E在机械结构分析中应用.以Mechanica模块解决单目标多变量约束的变截面悬臂梁外状优化.即先构造梁的模型,定义测量点、施加约束及载荷、选择模型材料、建立静态分析任务等步骤对模型进行静态分析.再通过定义设计参数、局部/全局灵敏度分析,最后完成优化设计分析,确定满足优化目标的模型.     

基于VC和ANSYS的破片侵彻参数化有限元分析

基于ANSYS与VC实现不同类型破片侵彻参数化建模与有限元分析系统,利用VC封装ANSYS的二次开发工具APDL命令流,使分析参数化,并将APDL命令流文件自动读入ANSYS进行侵彻有限元分析。建立侵彻分析的有限元模型,替代ANSYS人机交互的GUI方式,避免重复性的建模和参数设定,提高建模的工作效率和有限元分析的可靠性。     

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.     

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.     

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.