动态针刺起爆实验与理论研究的新进展

利用动态模拟装置测试和研究了雷管和火帽两种典型针刺火工品在动态击发条件下的发火性能，获得了动态发火性能试验数据。与落球仪的测试结果及经典公式Ｅｆ＝Ｅｏ．Ｅ＾－０．１ｖ计算结果进行了对比分析。从基本原理出发建立了尖头和平头两种击针在针刺过程中力学模型、戳击速度模型和针刺功率模型，并推导出分析解。     

火工品感度测试动态斜坡法与升降法比较研究

对动态斜坡法与升降法测试原理优缺点进行了比较,在动态斜坡法测试敏感和钝感型电火工品发火感度试验的基础上,结合与升降法试验结果的对比,对动态斜坡法进行了研究。通过改变试件压药条件,利用动态斜坡法能得到火工品发火感度临界值的特性,探讨了压药压力和发火感度之间的关系。结果证明,该方法所需试件数量相对减少,能满足感度试验的要求。初步探索了解决动态斜坡法与现有火工品验收试验之间矛盾的方法。     

火工品可靠性评估小样本试验设计方法

为了实现火工品高可靠性指标的小样本评估,研究了火工品可靠性评估小样本试验设计方案,给出了基于试验信息熵的小样本试验设计方法。采用该方法对用于H/DRl31引信头部击发机构的54号针刺雷管可靠性进行了试验与评估。结果表明,在试验刺激量4.5cm处试验22发产品,全部发火,评估结果与采用1800发大样本试验验证结果一致,该产品达到了置信水平为0.90,可靠度为0.999的可靠性指标。     

基于过载冲击下的针刺延期火工品性能

采用分离式霍普金森压杆(SHPB)技术研究了过载冲击对针刺延期火工品性能的影响,利用工业CT技术对针刺延期火工品结构损伤进行了分析,结果表明,过载冲击对针刺延期火工品结构损伤与性能影响有明显不同,过载后装药界面发生位移,发火感度降低,延期时间变短,精度变差,但能量输出变化不大。     

电火工品小电流无损检测的可行性

介绍电火工品无损检测的一次试验结果，发现电火工品在大电流作用下的发火时间与其小电流无损检测的输出有关。因此，认为有实现电火工品单发发火性能预报的可能性，并对发火性能预报的两种无损检测方法进行了讨论。     

静电放电刺激对桥丝式电火工品发火可靠性的影响

根据桥丝式电火工品的静电发火数学模型，考虑到ＥＳＤ刺激对药剂剂有效百分含量的影响，计算出在不同ＥＳＤ刺激水平和刺激次数下电火工品的临界发火能量。     

电火工品发火可靠性数字化测试技术研究

为解决部队电火工品发火可靠性测试精度、自动化和数字化程度低的难题,对电火工品发火可靠性检测的数字化测试进行研究。将嵌入式微处理器技术、数调线性电源技术与数字电子测量技术相结合,设计、制造了测试系统的软、硬件。介绍了测试系统组成及工作原理,并根据电火工品的电阻值大小和在规定电参数下是否发火判定电火工品的可靠性。结果表明:该技术能解决部队电火工品发火可靠性测试精度、自动化和数字化程度低的难题。     

碳化硅导电胶对电火工品性能的影响

为了研究碳化硅导电胶中碳化硅与环氧树脂胶配比对电火工品静电防护、绝缘电阻及发火感度等性能的影响,调节了碳化硅与环氧树脂胶的配比,制备了10种不同配比的碳化硅导电胶材料,按照GJB5309.6-2004《火工品试验方法》规定的静电放电试验、绝缘电阻测定方法,测试了未涂敷碳化硅导电胶和涂敷不同配比碳化硅导电胶条件下某制式电火工品的最高静电防护电压、脚壳绝缘电阻以及发火性能参数,获得了碳化硅导电胶对电火工品性能的影响规律。结果表明,碳化硅与环氧树脂胶配比为1.25∶1时,该电火工品的最高静电电压防护能力达到30 kV,能够满足测试电压低于100 V时绝缘电阻值20 MΩ的要求,又不影响产品的发火性能。     

典型火工品超低温安全性试验研究

为测试液氮超低温环境下火工品的安全性能,按照国军标要求,选取3种典型火工品,采用升降法开展了试验研究.将每种火工品分为3组,分别进行常温、超低温和超低温冷冻16h恢复常温后的发火感度及输出威力试验.测试结果表明:对于发火感度,3种火工品在不同试验条件下无本质变化,但仍能够发火;对于输出威力,2种雷管在不同试验条件下无本...     

基于发火可靠度裕度的生产方风险分析

基于火工品感度分布模型及GJB376-87给出的火工品发火可靠度裕度系数定义,推导出了生产方风险与火工品发火可靠度裕度系数之间的定量关系式.利用该关系式和升降法试验,求得某针刺雷管发火可靠度裕度系数为1.74,生产方风险为0.003%;某电雷管发火可靠度裕度系数为1.48,生产方风险为0.00096%.结果表明,本文给出的这种定量关系与实际产品相符.     

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.     

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.     

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.     

Design of Non-fragile Satisfactory Estimator for Linear Continuous Perturbed Stochastic Systems

The design problem of non-fragile estimator is addressed for a class of perturbed linear continuous systems. The perturbations occur on the plant and estimator parameters. The estimator designed should force the error system to achieve the desired decay rate and force the steady error variance less than the specified upper bound irrdevancy of the admissible plant perturbations and estimator perturbations. Consistency problem of the decay rate with the variance upper bound is first considered via linear matrix inequality （LMI） approach. The solution of the estimator parameter under specifications to be consistent is then discussed. The consistency condition of specifications and estimator parameter solution are transformed to feasible or minimum problems subject to a set of LMI respectively. The method is illustrated by a numerical example.     

An Improved Scene-based Nonuniformity Correction Algorithm for Infrared Focal Plane Arrays Using Neural Networks

The improved scene-based adaptive nonuniformity correction （NUC） algorithms using a neural network （NNT） approach for infrared image sequences are presented and analyzed. The retlna-like neural networks using steepest descent model was the first proposed infrared focal plane arrays （IRFPA） nonuniformity compensation method, which can perform parameter estimation of the sensors over time on a frame by frame basis. To increase the strength and the robustness of the NNT algorithm and to avoid the presence of ghosting artifacts, some optimization techniques, including momentum term, regularization factor and adaptive learning rate, were executed in the parameter learning process. In this paper, the local median filtering result of Xij （ n ） is proposed as an alternative value of desired network output of neuron Xij （ n ）, denoted as Tij （ n ）, which is the local spatial average of Xij （ n ） in traditional NNT methods. Noticeably, the NUC algorithm is inter-frame adaptive in nature and does not rely on any statistical assumptions on the scene data in the image sequence. Applications of this algorithm to the simulated video sequences and real infrared data taken with PV320 show that the correction results of image sequence are better than that of using original NNT approach, especially for the short-time image sequences （several hundred frames） subjected to the dense impulse noises with a number of dead or saturated pixels.     

Piecewise Filter of Infrared Image Based on Moment Theory

The disadvantages of IR images mostly include high noise, blurry edge and so on. The characteristics make the existent smoothing methods ineffective in preserving edge, To solve this problem, a piecewise moment filter （PMF） is put forward. By using moment and piecewise linear theory, the filter can preserve edge. Based on the statistical model of random noise, a related-coefficient method is presented to estimate the variance of noise. The edge region and model are then detected by the estimated variance. The expectation of first-order derivatives is used in getting the reliable offset of edge. At last, a fast moment filter of double-stair edge model is used to gain the piecewise smoothing results and reduce the calculation. The experimental result shows that the new method has a better capability than other methods in suppressing noise and preserving edge.     

Bistatic Sonar Localization Based on Best Linear Unbiased Estimation

A best linear unbiased estimation （BLUE） algorithm for bistatic sonar localization is proposed. The Cramer-Rao bound for bistatic Sonar and the geometrical dilution of precision （GDOP） in different conditions are given. The simulation results show that the location accuracy of BLUE algorithm is higher than the weighted least square method.     

Research on Gear-broken Fault Diagnosis in a Tank Gearbox

A fault diagnosis method of working position gear in a tank gearbox is put forward based on simulating the fault of working position gear in an actual tank, extracting the envelope of vibration signal by Hilbert transformation amplitude demodulation method, and zooming the low-frequency band to envelope signal.