基于Bayes方法的火箭弹存储可靠性分析

对成败型的火箭弹存储可靠性进行分析,建立了一种综合部件存储数据和少量整机试验数据的存储可靠性评估方法。先将部件串联而成的模拟系统作为先验分布的参考模型,然后利用先验矩方法确定先验分布的超参数,最后结合整机试验信息,利用Bayes方法对系统存储可靠性进行评估。通过该方法在某型产品上的应用表明,可显著减少存储试验样本,且具有较高的评估精度。     

基于新Dirichlet先验分布的指数寿命型产品多阶段可靠性增长Bayes分析

本文基于新的Dirichlet先验分布，建立了多阶段指数寿命型产品可靠性增长的Bayes模型。本模型充分利用先验信息和阶段试验信息，采用最优化方法解决了新的Dirichlet先验分布超参数因物理意义不明确而难以确定的问题；利用Gibbs抽样算法进行后验推断，合理估算出当前阶段和后续试验阶段产品可靠性的Bayes点估计和置信下限，并利用该模型研究实现了对产品可靠性的预测。实例证明了该模型在多阶段指数产品可靠性增怅分析中的直观性与有效性。     

基于AMSAA增长模型的鱼雷系统Bayes可靠性分析

Bayes理论是分析研究鱼雷系统可靠性的有效方法，文中针对美国陆军装备系统分析中心( AMSAA)增长模型，提出了Bayes可靠性增长分析的基本方法。该方法将鱼雷研制阶段的可靠性增长试验数据作为产品可靠性评估的先验信息，再结合少量现场试验数据，运用Bayes方法即可对现场试验后的鱼雷产品可靠性进行评定。仿真结果验证了该方法的有效性，为鱼雷系统可靠性评定提供了一种新的分析方法。     

基于非齐次Poisson过程的多阶段可靠性增长Bayes评估研究

针对航空航天领域试验费用昂贵、试验数据少的问题,研究了多阶段可靠性增长Bayes分析方法.采用非齐次Poisson过程(NHPP)建立可靠性增长模型;利用Bayes方法融合专家信息,并根据可靠性增长的特点采用Gamma-Beta分布作为NHPP参数的先验分布,通过阶段间可靠性增长信息传递的方法,实现多阶段的可靠性增长评估.最后通过一个发动机的例子表明该方法和模型能够充分利用多阶段的专家经验和试验数据,适合小子样场合的可靠性增长评估.     

无验前信息的成败型弹药产品可靠性评估

为有效评估成败型弹药的可靠性,介绍成败型部件可靠性经典评估方法和Bayes 评估方法。针对无验前 信息的弹药成败型部件可靠性评估问题,提出采用3 种常用共轭先验来求其可靠性下限,并通过数值仿真分析,得 到常用共轭先验分布对可靠度置信下限的影响规律以及每种共轭先验分布的适用情况。结果表明：3 种共轭先验分 布评估得到的结果较为合适,可为提高弹药可靠性评估的准确性提供支持。     

基于混合Beta先验分布的成败型产品的可靠性评估

成败型产品可靠性的小样本评估方法,把历史试验数据作为Bayes估计方法的先验信息,有效地减少了样本量。但是传统的Bayes方法过度依赖验前信息,当新产品有改进时造成鉴定结果的冒进。针对过度依赖先验信息问题,本文提出了使用混合Beta先验分布,引入继承因子,通过调整继承因子的大小来控制对验前信息的依赖程度,考虑了成败型产品的变化对评估结果的影响。采用该方法对某导弹的可靠性进行了评估。     

高价值火工品可靠性增长评定方法研究

对高价值火工品的可靠性增长模式进行了分析，提出了一种将增长过程各阶段试验数据折合为最终试验阶段数据的折合方法，并推导出折合后最终阶段的经典可靠性置信下限和Bayes置信下限。实际算例表明，采用本文的折合方法对增长过程各阶段试验数据进行折合后利用，评估出的可靠性更符合产品实际情况。     

小子样条件下导弹装备零部组件可靠性评估

为解决导弹装备零部组件的可靠性评估问题,提出一种用小子样试验数据进行装备零部组件的可靠性评估方法。通过将Bootstrap进行改进得到Bayes Bootstrap,采用验前信息弥补现场试验子样的不足,利用先验信息的Bootstrap进行可靠性评估,并给出一种具有双参数Weibull分布特征的零部组件可靠性评估实例。实验结果表明:该方法可有效解决小子样条件下的导弹装备零部组件的可靠性评估问题,可为实现信息化战争中的精确保障、满足战时高效保障的需求提供参考。     

基于GO 法和Bayes 的制导弹药控制系统可靠性评估

为解决制导弹药实验可靠性评估困难的问题,提出一种融合GO法和Bayes估计的制导弹药可靠性评估方法.利用Bayes法对多源先验信息进行处理,采用威布尔分布作为分布拟合,结合GO法,生成GO图并进行运算,构建系统可靠性模型,给出系统可靠性评估,并以制导弹药控制系统为实例进行验证.结果表明:该方法既充分利用了先验信息,又体现了GO法对复杂系统分析的优势.     

某型导弹发射装置故障检测率的Bayes估计

采用无先验信息下的Bayes评估方法，利用常用的共轭分布作先验分布，对先验分布中超参数的取值范围做出假设，运用Bayes理论计算出故障检测率的Bayes估计。并以Bayes估计为基础，结合超参数，求出故障检测率的经验Bayes估计，最后，运用实验数据对所做出假设的合理性进行说明。     

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.     

Expert Systems Aimed at General Design of Projectiles

Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed.     

Parameter Identification for the Valve Control Cylinder System of a Hydraulic Manipulator

In mechanical, hydraulic and electronic systems, the determination of system parameters is often challenging because liquid parameters often change significantly, due to variations in working and environmental conditions. Therefore, it is of significant practical importance to identify those parameters through experimental procedures. A systematic approach to identifying parameters in the valve controlling cylinder system of hydraulic manipulators is provided. It first derives the transfer function of the system, and then uses P control of PID control to predict system parameters. The predicted parameters are further validated using PID control. The prediction through simulation using MatLab language is utilized, which agrees well with experimental results.     

Software Communication Architecture Implementation and Its Waveform Application

This paper attempts to do a research on the development of software defined radio（SDR） based on software communication architecture（SCA）. Firstly, SCA is studied and a whole reference model of SCA3.0 core framework （CF） is realized; Secondly, an application-specific FM3TR waveform is implemented on the platform of common software based on the reference model; Thirdly, from the point of view of real-time performance and software reuse, tests and validations are made on the above realized CF reference model and FM3TR waveform. As a result, the SCA-compliant SDR has favorable interoperability and software portability and can satisfy the real-time performance requirements which are not too rigorous.     

Three-dimensional Numerical Simulation of Combustion Field in the Combustion Chamber

In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective.     

Dynamic Simulation of the Tank Gun Recoil Response

By using the ATV module of MSC. ADAMS, the dynamic simulation of recoil response of tank gun is analyzed.How the recoil force affects the bodywork and the suspension during gun firing, as well as the changing status of the gun muzzle‘s velocity are gained. All results and analyzing methods are offered for the designing basis of optimizing tank vehicle-gun match. The constructive exploration is beneficial to improving the general capability of tank.     

Survey of Controllable Suspension System for Off-road Vehicles

The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing.     

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.     

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.