筛选分组方法在电火工品性能测试中的应用

为正确判断电火工品受环境因素影响后的性能变化情况,通过瞬态脉冲试验、发火试验以及升降法试验得到的试验结果,研究了对桥丝式电火工品进行随机分组和用瞬态脉冲试验进行筛选分组两种试验方法的区别,比较了两种试验方法中不同组电火工品50%发火电流、平均发火时间和平均温升值差异.结果表明按照瞬态脉冲试验对样品进行筛选分组的方法可以...     

电火工品发火感度无损检测的展望

介绍了电火工品瞬态脉冲试验的基本原理,回顾了电火工品发火感度无损检测技术的发展历史,认为该技术目前仍处于统计性处理的阶段,今后应拓展该技术应用领域,加强电火工品发火性能的单发预防并研制相应的仪器。     

射频对桥丝式电火工品性能的影响

本文研究了射频试验对桥丝式电火工品性能的影响。试验表明，经射频能量作用后，桥丝式电火工品发火功率降低、作用时间变长，甚至可能造成射频瞎火。文章还对施加射频能量的大小、时间及对电火工品性能的影响进行了测试。     

引信发火系统无损检测研究

简单介绍了瞬态脉冲试验（ＴＰＴ）的原理，分析了美国ＴＰＴ技术在引信发火电路锈蚀检测中的应用，以及我国ＴＰＴ技术用于电火工品储存性能无损测试验结果，论证了利用ＴＰＴ技术进行引信发火系统无损检测的可行性。     

引信发火系统无损检测研究

简单介绍了瞬态脉冲试验（ＴＰＴ）的原理，分析了美国ＴＰＴ技术在引信发火电路锈蚀检测中的应用．以及我国ＴＰＴ技术用于电火工品储存性能无损检测试验结果，论证了利用ＴＰＴ技术进行引信发火系统无损检测的可行性。     

桥丝式电火工品射频致瞎评估

依据 MIL-STD-1576中射频感度试验方法和射频致瞎评估方法,对两种典型桥丝式火工品进行了射频感度试验和射频暴露前后直流感度试验,对比分析两种样品在10%射频发火能量作用前后的直流发火特性,并对二者进行射频致瞎评估.本研究对射频致瞎评估方法进行初步探索与实践,积累了一定的试验数据,为进一步开展电火工品射频致瞎试验和评估方法研究奠定基础.     

桥丝式电火工品安全电流的数学模型

从桥丝式电火工品的传热模型入手,结合瞬态脉冲试验的原理,对桥丝式电火工品的安全电流进行了研究,得出了计算安全电流的数学模型和安全电流的数学表达式,证明利用无损检测和数学模型对单发电火工品进行性能预测是可行的,为进一步研究电火工品的单发性能预报提供了参考.     

电火工品发火过程的无损耗检测方法

提出一种电火工品无损耗检测的方法,以便在电火工品的可靠性试验中对产品的性能给出准确的判据.采用感应线圈作为非接触式发火电流的检测装置,实现了对电火工品发火电流的无损耗取样,同时采用大规模集成电路,实现了电火工品发火过程中微秒级瞬态信号的采集、存储与处理,为可靠性试验提供了一种在线的无损耗实时检测系统,可以对电火工品的发火全过程进行检测.     

电火工品的感度控制和预报

介绍了电火工品用瞬态脉冲试验控制感度的基本方法，讨论了电火工品发光感度无损检验的发展前任认为发展单发性能损报和相应的仪器有很大的可能性。     

灼热桥丝式电火工品脉冲电流激励发火规律分析

为研究灼热桥丝式电火工品的脉冲激励安全性,建立了灼热桥丝式电火工品的温升数理模型,研究了灼热桥丝式电火工品的发火判据,设计了灼热桥丝式电火工品临界发火电流的计算流程,揭示了单脉冲和脉冲串电流的激励参数对灼热桥丝式电火工品临界发火电流的影响规律。结果表明,在单脉冲激励下,当脉冲宽度小于5 μs时,灼热桥丝式电火工品的临界发火能量固定,即桥药系统处于绝热状态,灼热桥丝式电火工品是否发火与桥丝输入的能量有关;而当脉冲宽度大于15 ms时,灼热桥丝式电火工品临界发火电流固定,其发火状态与桥丝的电功率有关。在窄脉冲串电流激励下,临界发火电流随重复周期变化曲线的时间常数与脉宽无关,且当重复周期大于1.25 ms时,桥药系统无热累积效应,其临界发火电流与单脉冲电流作用情况一致;而当重复周期小于1.25 ms时,桥药系统出现热累积效应,该效应导致临界发火电流随重复周期降低而迅速衰减。     

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.     

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.     

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.     

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.