自行火炮抽气装置防烧蚀腐蚀的改进试验

针对自行火炮多次射击后抽气装置大多出现烧蚀与腐蚀的情况,在抽气装置工作原理基础上,建立了抽气装置工作过程数值模型;对某炮充气系统,通过编程计算分别给出了抽气装置内气体压力与温度的变化曲线.分析了抽气装置烧蚀腐蚀机理,结果表明,抽气装置是在高温高压环境内工作的.提出了抽气装置改进措施,实践证明,抽气装置磷化、耐高温漆复合工艺处理措施可有效解决烧蚀、腐蚀问题.     

基于二维速度测量的简易火控装置

基于二维速度测量的简易火控装置由火控计算机、轴角编码器、倾斜角传感器、激光测距机、键盘、目标锁定按钮、显示屏等组成.该装置可测出瞄准线转动的任意角度,能随时停止测角进行射击.由两次测距的目标径向运动信息,实现目标二维运动速度测量,改善射击精度.装置计算模型包括射角、方向角提前量的解算及其倾斜修正.     

9AA100型电视跟踪高炮火控系统

9AA100型系统为菲力浦公司产品,用于地面固定或活动设施控制二至四门高炮,主要用作机动或要地防空。它的变型产品9LV100型,可用作舰载系统。 9AA100型系统是根据瑞典军方要求设计的。通过对一台样机进行广泛的野外试验后,已订货大量生产这种装置作为活动的与固定的地面装备(固定装备为其基本型号)。每一台装置可控制两门鲍福斯40毫米高炮。该炮根据一並行的工作计划作了改进,改进计划的一部分是采用带近炸引信的成形预制碎片弹。按照     

单翼末敏弹扫描运动研究

稳态扫描技术是末敏弹系统研制过程中的关键技术之一.本文在分析末敏弹现有稳态扫描技术优缺点的基础上提出了一种新的技术,即用端部配重的单侧翼,也即用人为的子弹质量和空气动力的强非对称实现稳态扫描.分析了此种末敏弹系统的受力情况,建立了系统的二体运动模型,并详细讨论了此模型中约束力及约束力矩的消元化简方法,推导出了适于上机编程的标准形式的方程组,并用其编制了诸元计算程序.程序算例表明这种结构可以实现稳态扫描并用作稳态扫描装置,该动力学模型可以用于末敏弹总体及其稳态扫描装置设计的研究中.     

毫米波雷达导引头

美国休斯飞机公司试验了一种雷达导引头,它可用作近程导弹的末制导装置。这种导引头的工作频率为94千兆赫,是由美国空军和海军投资研制的。目前,大多数雷达导引头都采用Ⅰ-波段(8～10千兆     

火工品感度试验用便携式计算装置

对一种火工品感度试验用的便携式计算装置进行了功能及软、硬件设计开发,该装置集成了升降法、兰利法及D优化法3种感度试验方法,并采用与文献值对比和验证试验的方法对装置的使用及计算的准确性进行了分析研究.结果表明,该装置计算结果准确,可以方便工程技术人员进行现场感度试验并且便于D优化法的推广使用.     

导弹的方位瞄准装置

发明的背景有些新式导弹系统常把捷联式惯性测量装置用作弹上的瞄准装置。这样的惯性测量装置通常由三个陀螺、三个加速度表、以及包括计算机在内的电子学装置组成,所有这些可以用来确定和保持一个基准座标系,据此得出速度和位置的数据。然而,除非使用     

并行计算在KDP晶体安装方式优化中的应用

利用有限元方法和并行计算方式,对在重力条件下KDP晶体各种装夹方式的结构变形进行力学仿真分析.其KDP晶体通过金属框与装置联接,将连续的区域离散为一组有限个、按一定方式相联结的单元.将整个求解域的微分方程用每个单元的代数方程组取代.采用数值计算求解代数方程组,从而获得整个结构的位移场、应变场、应力场数据.数值计算结果表明,该计算方式可有效提高优化设计效率,缩短设计周期.     

捷联惯性测量解算方法及测高误差估算

应用四元素法的捷联算法,采用Matlab编程.积分运算采用经典4阶Runge-Kutta算法实现.捷联惯性测量中数学平台和定位解算包括参数初始化、计算装置从惯性器件实时读取数据、载体所在位置重力加速度值计算、速度和位置积分运算等.对可预测的直线轨迹、曲线轨迹对其算法和所编写程序的正确性进行了验证.同时结合一载体运动轨道参数,对各因素对测高误差的影响进行估计,结果证明该方法可行.     

基于空气炮的测试装置系统灵敏度校准方法

为实现对侵彻测试装置整体灵敏度和精度的校准,提出了一种基于空气炮的装置校准方法。通过对测试装置进行空气炮撞击试验,可测试出撞击时装置的过载信息;通过基于多普勒效应的差动式激光干涉仪,可测出装置和光栅的移动速度。此外,对装置测量的过载信号进行积分处理,可计算出装置撞击的初始速度。通过2个速度的比较,即可实现对测试装置的系统灵敏度的校准。实验表明,该方法能够实现装置灵敏度的校准,并且具有较高的精确度。     

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.     

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.     

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 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.