Optimal robust non-fragile Kalman-type recursive filtering with finite-step autocorrelated noises and multiple packet dropouts

In this paper, the optimal robust non-fragile Kalman-type recursive filtering problem is studied for a class of uncertain systems with finite-step autocorrelated measurement noises and multiple packet dropouts. The system state, measurement output and filter parameters are all subject to stochastic uncertainties or multiplicative noises, where the measurement noises are finite-step autocorrelated. When there exist multiple packet dropouts in the system output, the original system is converted into an auxiliary stochastic uncertain system by the augmentation of system states and measurements. The process noises and measurement noises of the auxiliary system are shown to be finite-step autocorrelated and cross-correlated. Then, a robust non-fragile Kalman-type recursive filter is designed that is optimal in the minimum-variance sense. The proposed filter is not only robust against the uncertainties in the system model and measurement model, but also non-fragile against the implementation error with the filter parameters. Simulation results are employed to demonstrate the effectiveness of the proposed method.     

空间遥感器大口径反射镜支撑结构型式综述

文章针对空间遥感器大口径反射镜（口径大于500mm）总结了影响支撑结构设计的主要因素，介绍了几种主要的支撑结构型式，并讨论了支撑结构设计中所需要考虑的若干问题。     

金属模的热平衡

实验研究了铸造过程中金属模温度的变化规律；分析了铸件壁厚、模具厚度、涂料和预热温度对金属模热平衡的影响     

基于成像跟踪的比例导引律实现

在综述了各种成象跟踪算法的基础上，给出了一种新的适于飞行力学自动目标跟踪算法的基本思想和方法步骤。研究和控制利用成像跟踪算法获取比例导引律中视线角速度和导弹怀目标间相对速度的方法，并结合导弹飞行控制数学模型，提出了一种基于成像跟踪的比例导引律实现方法。     

片梭织机打纬系统的改进设计

通过分析片梭机打纬系统多组共轭凸轮的选配难度及打纬力过剩问题，提出借助 CAD设计共轭凸轮，在保证打纬力的前提下，采用新结构，取消多组打纬凸轮，可为片梭机改进改型，完善共轭凸轮的整体协调，消除各类误差，降低成本创造条件。     

利用辅助圆锥面法图解与计算回转体表面上的等倾曲线

本文基于曲面相交理论，依据辅助圆锥面和辅助平面与已回转面相交的三面共点原理，给出了图解回转体表面上等倾曲线的原理与方法，同时还给出了适合于微机求解等倾曲线上点的坐标的数值计算公式。     

喷射沉积Ni3Al基高温合金及其复合材料的显微组织和力学性能

利用喷射沉积技术成功地制备了Ｎｉ－Ａｌ－Ｍｏ系Ｎｉ３Ａｌ基高温合金及其复合材料盘坯，对其显微组织和力学性能进行了测试和分析，并对陶瓷粒子的复合机制进行了初步探讨。     

电传飞控系统地面维护检测方法研究与探讨

某先进高级教练机采用典型电传飞控系统架构,本文通过对该型飞机电传飞控系统的组成和工作原理的分析,研究了该型飞机飞控系统地面的检测维护方法,并从系统检测维护的角度对电传飞控系统设计和优化提出了建议。     

Experimental study of an aircraft fuel tank inerting system

In this work, a simulated aircraft fuel tank inerting system has been successfully established based on a model tank. Experiments were conducted to investigate the influences of different operating parameters on the inerting effectiveness of the system, including flow rate of the inert gas(nitrogen-enriched air), inert gas concentration, fuel load of the tank and different inerting approaches. The experimental results show that under the same operating conditions, the time span of a complete inerting process decreased as the flow rate of inert gas was increased; the time span using the inert gas with 5% oxygen concentration was much longer than that using pure nitrogen;when the fuel tank was inerted using the ullage washing approach, the time span increased as the fuel load was decreased; the ullage washing approach showed the best inerting performance when the time span of a complete inerting process was the evaluation criterion, but when the decrease of dissolved oxygen concentration in the fuel was also considered to characterize the inerting effectiveness, the approach of ullage washing and fuel scrubbing at the same time was the most effective.     

塔1井采出液腐蚀与缓蚀机理

通过用EDS法分析了静态挂片表面沉积物的元素组成,运用动电位扫描极化曲线和滞后环实验等电化学方法对实验室和现场垢样的SEM和XRD的形貌和组成进行分析,研究了Q235钢在塔1井采出液水相中的腐蚀机理,结果表明塔1井采出液引起腐蚀穿孔的原因是垢下腐蚀而不是点蚀,腐蚀的速度受腐蚀反应的阴极过程控制.用旋转挂片仪筛选出的缓蚀剂用量为50 mg／L时缓蚀率超过90％,WJF-6缓蚀剂起到缓蚀作用的根本原因是抑制了电极反应的阴极过程.