偏最小二乘回归在导弹研制费用预测中的应用

分析了影响导弹研制费用的性能参数,提出用偏最小二乘回归方法来预测导弹研制费用.该方法对变量进行主要成分分析、典型相关分析和多元性回归,在处理存在多重线性相关的小样本多元数据方面精确度高.实例证明,该方法在导弹研制费用的预测应用中可行且精确可靠.     

应用改进的BP神经网络预测导弹的研制费用

结合导弹武器系统研制的特点，分析并确定了影响导弹武器系统研制费用的主要因素，并在前人研究的基础上，提出了基于改进的BP神经网络的费用预测模型。该模型不仅克服了以往由于专家主观因素而造成的负面影响，而且提高了算法的运行效率和模型的预测精度。通过具体的实例分析比较，充分证明了利用该方法的科学合理性。最后探讨了利用BP神经网络进行数值预测的方法和应该注意的问题，并给出了一些有益的建议。     

基于改进PSO-LSSVM 的军用工程机械研制费用预测模型

针对传统参数法对装备研制费用进行预测存在的局限性问题,采用改进粒子群算法（particle swarm optimization,PSO）对LSSVM模型进行改进,构建军用工程机械研制费用预测模型。运用2种优化策略改进粒子群算法,对种群初始化过程进行控制、克服粒子群算法易于早熟的缺点。用改进后的粒子群算法优化最小二乘支持向量机的模型参数和核参数,以获得更好的预测效果。预测结果表明：该费用预测模型运用于军用工程机械研制费用预测,明显优于传统预测模型,具有很好的预测精度和效率。     

基于参数法的3种研制费用估算模型

以防空导弹武器系统研制费用估算为研究对象,阐述了参数费用法中数据收集整理和自变量的选取两个重要内容,介绍了最小二乘、偏最小二乘和BP神经网络的原理,然后以国外8种型号导弹研制费用为实例,研究了如何建立这3种研制费用估算模型,最后对3种估算模型的计算结果进行了对比分析,得出了3种估算模型的优劣,并阐明了原因。本研究结果,对防空导弹武器系统研制费用的估算具有积极的参考意义。     

基于组合神经网络的装备研制费用预测研究

利用组合神经网络预测法.对装备研制费用进行预测研究.采用了两层预测系统第一层用灰色模型和神经网络分别对装备研制费用进行预测,第二层用BP网络对第一层的输出进行组合预测.通过对某型装备研制费用的预测分析,证实了本模型的科学性与正确性.     

导弹武器系统研制费用模型的建模思想，方法及实际应用

以导弹武器系统的研制为例，给出建立导弹武器系统研制费用模型的基本思想，假设费用模型构造的基本形式，以及在实际中的应用。     

基于BP网络的导弹研制费用预测

根据导弹武器系统研制的特点，分析并确定了影响导弹武器系统研制费用的主要因素，提出了基于人工神经网络的费用预测模型。该模型不需要确定各因素的定量关系，克服了以往由于专家主观因素而千万的负面影响，最后通过实际应用，说明了该方法简便易行，精确可靠。     

飞航导弹经济性的探讨

预测和估算费用是探讨经济性的一种方法,它是一项十分困难但又是非常重要的工作。正确的决策既取决于过去的经验,又取决于对未来的判断。特别是当今,导弹设计计中的研制费用已逐步成为重要的设计参数之一,更需要在型号的规划预研阶段,较早地预测出研制阶段的总费用。而随着对导弹性能要求越来越高,导弹武器系统的研制费用逐年增长,飞航导弹的研制费用也不例外,也在逐年增长。这就促使我们必须精细地研究导弹性能和研制经费之间的综合关系。     

基于BP神经网络的飞机机体研制费用估算

提出一种应用人工神经网络预测飞机机体研制费用的方法.该方法利用偏最小二乘法对飞机性能参数进行了主成分提取,用这些主成分作为BP网络的输入变量,建立了一种基于BP神经网络的飞机研制费用的估算模型,应用该模型对典型的飞机机体研制费用进行了预测.预测结果表明,该方法是有效的、可行的.     

基于变精度粗糙集的导弹需求量预测模型

建立了基于变精度粗糙集的战时导弹需求量预测模型。在对导弹需求量影响因素分析的基础上建立了导弹需求量预测决策表,采用基于属性重要度的启发式算法求解β近似约简,从而获取导弹需求量预测的相关规则。结果表明,该模型具有一定的有效性,为战时导弹需求量预测提供了一种新的途径。     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

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.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

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.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.     

Design and Analysis of Test Schemes of Static Postponing Time on Shrapnels Used to Riot Control

The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures,the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done,feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.     

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.