基于MEMS的微引信谐振器系统级设计

在微机电系统集成设计平台-MEMS Garden基础上,搭建MEMS微引信谐振器的系统级模型,并利用有限元仿真计算2种方法并对模型进行有效性验证,完成谐振器的结构设计,再由仿真得到结构性能参数。研究结果表明,采用系统级方法进行MEMS器件的设计能够在确保求解精度的前提下,显著提高设计效率,缩短设计周期,减小设计成本;所设计的MEMS微引信谐振器的各项性能指标完全能满足引信安全系统的应用要求。     

一种新型MEMS微惯性姿态系统自动化误差标定方法

针对MEMS微惯性姿态系统精度不高、标定花费时间长和人工参与标定步骤较多等问题,引入一种新型MEMS微惯性姿态系统自动化误差标定方法。该方法通过设置转台速率运行方式测量不同的角速率,经解算标定出零位、刻度因子、交叉耦合系数及安装误差角。试验验证表明,采用此标定方法原理简单、易于实现,能较好地补偿MEMS微惯性航姿系统的误差,提高导航精度。     

引信MEMS机构微装配研究

引信MEMS机构的研究将进入实用化,其装配技术成为关键技术.合适的装配方法可提高引信MEMS机构的生产效率,降低生产成本,保证引信系统的可靠性及安全性.分析了进行微装配研究的必要性,国内外微装配的现状及发展趋势,并对我国引信MEMS机构微装配的发展提出建议.     

一种新的微小型结构件显微图像边缘检测方法

针对目前大多显微图像边缘识别算法的边缘精确识别精度低等问题,提出一种基于工艺匹配思想的微小型结构件边缘识别算法。对不同工艺微小型结构件显微图像进行分析,通过提取不同加工工艺微小型结构件的边缘过渡区,建立边缘过渡区的数学模型,从数学模型中确定边缘点精确位置。建立基于显微视觉检测的边缘图像分形评价模型,分析同类工艺方法边缘图像的相似程度,并以实例进行实验验证。实验结果表明:该方法具有普遍适用性,且边缘检测精度高,能进一步满足精密测量的需要。     

集成微力检测与反馈的双晶片微夹持器

微夹持器广泛应用于微装配、生物、医疗等领域。目前复杂武器装备生产中的微小型结构件及系统的夹持和装配还是依靠现场工作人员的经验决定,因此,有必要对微夹持器进行研究。以双晶片微夹持器为例,针对复杂三维微小型结构件及系统,提出了集成微力检测与反馈的组合式微夹持技术并研制了相应的微夹持器;阐述了微力检测与反馈的基本原理,搭建了面向双晶片压电陶瓷微夹持器的基于半导体应变片的微力检测与反馈电路。通过夹持实验实现了微力信号的测量与检测,为夹持、移动和装配过程中的微力测量提供了条件。     

一种惯性测量组合的静态标定方法研究

某些情况下,在惯性测量组合的标定与对准过程中,转台的调平及寻北精度不能满足要求,大大降低了标定和对准的精度.为了弥补上述不足,文中提出了六位置标定方案.利用六位置方案对惯性仪器主要误差项进行标定,并进行了误差补偿的研究.通过仿真及误差分析,证明这种标定方案可以满足高精度、实时性的要求.     

MEMS惯组陀螺零位在线快速标定系统设计与实现

针对传统MEMS惯组标定算法标定步骤复杂,标定时间长的问题,根据MEMS惯组的参数变化特点,设计并实现了MEMS惯组在线快速标定系统,实现对MEMS惯组参数影响最大的陀螺零位进行快速标定。分析了MEMS惯组误差模型,介绍了在线快速标定系统组成,对快速标定算法进行了解释和说明,并给出了详细标定步骤。该系统简化了标定操作流程,缩短了标定时间,减少了标定保障条件,已成功应用于某精确制导炸弹,并具有良好的工程应用前景。     

集成微型记录器的微惯性测量组合

针对在地面标定和炮射试验时需要采集惯性测量组合输出信号的需求,设计了一种基于32位片上系统的微型记录器,并结合由MEMS惯性器件构成的微惯性测量组合的结构中有一定空间的特点,将其集成在微惯性测量组合的中心位置,构成了一种集成微型记录器的微惯性测量组合。最后对系统进行了地面标定测试。测试结果表明,集成微型记录器的微惯性测量组合能够真实地测量并记录角速度信号和加速度信号,经过多次测试,整个系统均能正常工作,性能稳定可靠,满足设计需求。     

基于支持度的椭球拟合微机械电子系统加速度计现场标定方法研究

为解决微机械电子系统（MEMS）中加速度计的零位漂移误差、标度因数误差和交叉耦合误差随时间推移而变化的问题,提出一种基于支持度的椭球拟合MEMS加速度计现场标定方法。该方法能够在室外进行简单、快捷和高效的标定,其本质是在传统的椭球拟合法基础上,采用支持度法与椭球体法相结合的方法,通过建立椭球约束模型和支持度矩阵对MEMS加速度计的误差进行标定,继而使用误差补偿方程对MEMS加速度计进行输出补偿,最终实现高精度标度。通过椭球拟合对比实验和时间推移实验,证实了该方法可在没有精密标定设备情况下进行标定,其标定精度比传统椭球拟合法提升1倍。     

高旋弹药飞行姿态测量用半捷联MEMS惯性测量装置研究

针对高速旋转弹药姿态测量中,传统的MEMS捷联惯性测量系统由于角速率传感器在量程和精度上不能同时满足测试要求而存在姿态测量精度低的问题,提出了半捷联MEMS惯性测量的概念、原理和半捷联MEMS惯性测量的实现方法;同时针对半捷联MEMS惯性测量系统的组成结构,对半捷联MEMS惯性测量装置进行了介绍。通过对动力输出仓、控制-驱动电路安装仓、惯性信息敏感仓和惯性信息采集仓的结构和功能说明,阐述了半捷联MEMS惯性测量的实现方法。该装置可在弹药高速旋转情况下为微惯性测量单元提供稳定测试环境,有效抑制高旋弹药对惯性系统姿态测量精度的影响,为高旋弹药姿态测量和常规弹药制导化提供了新的思路,具有一定的工程应用价值。     

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.