无线数据采集系统的智能供电电路设计

在无线数据采集系统中,无线数据节点有可能会被安放在不便拆卸且无法进行外部供电的设备中.为了在有限的电池电量下,尽可能久的实现数据采集,设计了一种基于MEAS振动传感器的低功耗供电电路.它通过传感器感受振动信号,判断设备是否处于工作状态,以此控制电池能量输出.将该低功耗供电电路运用在干式离合器摩擦片无线数据采集系统中,实验结果表明该低功耗供电电路的运用大幅度的降低了整个系统的功耗.     

320×256阵列红外焦平面读出电路的设计

提出一种320×256阵列红外焦平面读出电路,采用直接注入模式,具有多路输出、读出顺序可选等功能。具体设计了各个模块电路,并采用chartered 0.35μm工艺进行流片设计。实测结果表明所设计芯片输出摆幅为3.24 V,输出电压线性度为97.15%,功耗为32 m W,具有丰富的读出功能。     

气动力／直接力复合控制导弹的线性二次型最优控制设计

对应用直接力和气动力复合控制的弹体,进行线性二次型最优控制设计。通过求解线性二次型调节器获得最优状态反馈律,将最优状态反馈转换为等价的输出反馈,角速度和加速度的测量值就可用于输出反馈律的形成,避免了含有不可测量状态攻角的状态反馈律在实现上的困难。复合控制和气动力（或直接力）单独作用时的仿真对比结果说明,所设计的复合控制...     

火炮后坐能量转换装置动力学特性研究

利用直线发电机技术将火炮后坐动能转换为电能再利用,设计了一种新型火炮后坐能量转换装置。基于等效磁路法和虚功原理推导出该型直线发电机电磁力的解析公式;按照火炮后坐运动规律建立火炮后坐能量转换装置动力学模型;并结合有限元法对装置电磁场模型进行分析,研究分析了该装置的电磁阻力特性和动力学特性;提出了一种利用可调电阻对火炮后坐能量转换装置电磁力进行调控的方法,并进行仿真验证。结果表明,该种方法能够有效的对电磁阻力进行调控,为火炮后坐能量转换装置进一步应用提供依据。     

基于数据流的指令级功耗建模方法

在SoC系统中,嵌入式CPU内部的复杂性和应用需求使得其指令级功耗建模十分困难,为此提出了一种基于数据流的指令级功耗建模方法,考虑到了CPU内部信号变化对功耗的影响。采用包括了所有指令类型的7个算法程序作为样本的验证结果显示该模型具有较快的执行速度和稳定的计算精度,可以为低功耗EDA软件设计提供指导。     

非线性油气悬架的阻尼特性研究

以矿车后悬的油气悬架为研究对象,利用统计线性化的方法,按照等效线性阻尼系数相等的原则,计算出了渐增、线性和渐减3种阻尼模型的参数.在稳态随机路面的激励下,利用Matlab/Simulink仿真并比较非线性刚度与3种阻尼模型匹配时的车身加速度均方根值、悬架动行程、车轮动载荷以及减振器的发热功率,得到了不同类型阻尼对上述指标的影响,对阻尼的匹配、优化设计具有参考价值.     

一种小型脉冲激光器能量和重复频率测量电路

针对传统激光功率计无法实时检测的缺点,设计一种基于PIN光电二极管的小型激光脉冲能量和频率实时检测电路。在激光器输出窗口前端设置光学玻璃对激光输出进行透射和散射,利用PIN光电二极管探测激光散射信号并完成光电转换。微弱电信号经后续信号调理电路处理以外部中断方式触发单片机计时、计数,单片机同时采集调理电路的输出电压。系统最终实现了激光脉冲频率及能量的检测。测试结果表明:该系统的频率测量精度优于0.02%,能量测量精度优于1%,灵敏度优于0.8 V/mW,响应时间不大于3 ns。     

模糊自适应PID 在气液增力缸压力控制中的应用

为提高气液增力缸的输出压力精度并增强系统的一致性和稳定性,设计一种模糊自适应PID控制器。根据气动伺服系统的建模推导出比例阀控制气液增力伺服系统的数学模型,并结合模糊自适应控制原理,以离线生成控制查询表在线查询的方式,实现实时自整定PID参数。通过建立系统仿真模型,得到比常规PID控制更好的稳态和动态特性的控制系统。仿真结果证明,该方法可以大大地提高气液增力缸在压力控制中的控制精度。     

一类碟式飞行器的线性-自适应Terminal滑模混合控制

提出了一种新的线性-自适应Terminal滑模混合控制，把线性状态反馈控制和自适应Terminal滑模控制结合在一起。Terminal滑模控制能够使误差在有限时间内快速收敛到零。在介绍Terminal滑模概念和自适应Terminal滑模方法的基础上，设计了基于质量控制的飞碟的相应控制器。基于质量控制的飞碟是一个多输入多输出的高阶非线性系统。本文的方法保证了输出跟踪误差在有限时间内快速收敛到零，并且有比传统滑模控制更好的动态性能，最后仿真说明了本方法的有效性。     

基于归一化优势函数的强化学习混合动力履带车辆能量管理

基于强化学习的能量管理策略由于状态变量和控制变量的离散化,处理高维问题时存在“维数灾难”的困扰。针对此问题,提出一种基于归一化优势函数的深度强化学习能量管理算法。采用两个具有归一化优势函数的深度神经网络实现连续控制,消除离散化。在对串联式混合动力履带车辆动力总成建模的基础上,完成深度强化学习能量管理算法的框架搭建和参数的更新过程,并将其应用于串联式混合动力履带车辆。仿真结果表明,该算法能够输出更为细化的控制量以及更小的输出波动性,与深度Q学习算法相比,对于串联式混合动力履带车辆的燃油经济性提升了3.96%. 通过硬件在环仿真实验验证了强化学习能量管理算法的适应性,以及在实时控制环境下的优化效果。     

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.