超支化聚（胺－酯）对环氧树脂力学性能的改性

采用一步法合成不同代数的超支化聚(胺-酯),测试不同温度下的黏度变化,并对其结构用傅里叶变换红外光谱仪(FT-IR)进行了初步表征.以所合成的不同代数的超支化聚(胺-酯)改性环氧树脂,测试其冲击强度与弯曲性能,采用扫描电镜对冲击断口进行了表征.结果表明,不同代数的超支化聚(胺-酯)的黏度随温度升高而下降,超支化聚(胺-酯)与环氧树脂相容性好,代数越高,增韧效果越显著,弯曲强度和弯曲模量下降也越明显,冲击断口表现出明显的韧性断裂的特征.     

大迎角纵向短周期飞行品质计算

根据六种短周期飞行品质判据（ＣＡＰ或ω＾２,ｐ／（ｎ／ａ）,ζｓｐ,τθ,ω,ｐＴｏ２,ζｓｐ,τθ瞬时峰值比,上升时间,有效延迟,带宽和时间延迟,闭环Ｎｅａｌ－Ｓｍｉｔｈ准则;Ｇｉｂｓｏｎ时域响应准则）计算了某典型第三代战斗机在失速迎角前的纵向短周期飞行品质,并与国外有关地面模拟试验结果进行了比较,结果表明,失速迎角前的大迎角短周期飞行品质,仍然可以通过综合上述六种小迎角判所的计算结果进行评价,     

扇面波导斜缝特性的矩量法分析

根据缝隙口面切向场的连续条件,采用解析数值法--矩量法,对扇面波导宽壁上窄的斜缝进行了计算,解得了磁流系数及其分布,并得到散射场、等效散射参量及等效阻抗等重要参数.假定波导中仅有TE-11主模传输,在X波段计算了散射参量和归一化等效串联阻抗,给出计算结果,为缝隙天线和缝隙阵列设计提供了依据.     

混沌疲劳初探

引入非线性动力系统分叉与混沌研究方法,探讨疲劳损伤系统的性质突变.基于物理力学观点,提出了疲劳损伤微观系统模型,定性地分析、讨论了疲劳损伤系统的局部分叉(Hopf分叉)与全局分叉(混沌)机制,给出了系统产生局部分叉时的参数取值范围和产生混沌运动的门槛值.     

模拟旋转内冷通道中压力测量的实验研究

在旋转内冷通道中,用压力传感器测量垂直于旋转轴的矩形管道充动气体的压力分布,实验结果表明：（１）在同一半径处,转速增加引起压差减少,（２）在转速较低时随着半径增大,压差减小,但转速较大,总的压差反而随着半径增大而增大,（３）流体管道中的扰流柱起着增另气流紊流的作用,导致压力损失增大,压降增大。     

耐高温Ni—ZrO2复合镀层的制备及影响因素研究

采用复合电沉积技术制备出了Ｎｉ－ＺｒＯ２耐高温复合镀层,并利用正交设计对影响复合电沉积过程的电流密度ｉ、镀液中微粒浓度ｃ、搅拌方式ｍ、微粒粒径ｄ及其间的交互作用等进行了研究。结果表明,上述因素对复合镀层中ＺｒＯ２含量影响显著性大小顺序为：ｄ＞ｍ＞ｄ×ｍ＞ｃ＞ｄ×ｃ＞ｉ×ｍ。     

Magnetic Signal Processing & Analysis for Airfield Traffic Surveillance

This paper presents an innovative system for airport surface surveillance based on a novel magnetic sensing technology. Ferromagnetic objects such as vehicle motors, aircraft engines, and landing gears are detected through their deformation of the Earth's magnetic field. Tests have shown that although the local changes of the Earth's magnetic field are extremely small, the proposed sensing technology is able to detect them reliably. The primary objective of the proposed approach is to provide a complementary surveillance system for existing and future Advanced Surface Movement Guidance and Control Systems (A-SMGCS) at large airports or a cost-effective surveillance solution for monitoring critical areas at medium and small airports. Unaffected by weather conditions, interference and shadowing effects, the system provides reliable position, velocity, and direction information without requiring any equipment in aircraft or ground vehicles. The outcome of a comprehensive market analysis is discussed and test results under real life conditions at two airports are evaluated analytically.     

Sliding mode and shaped input vibration control of flexible systems

In this paper, the vibration reduction problem is investigated for a flexible spacecraft during attitude maneuvering. A new control strategy is proposed, which integrates both the command input shaping and the sliding mode output feedback control (SMOFC) techniques. Specifically, the input shaper is designed for the reference model and implemented outside of the feedback loop in order to achieve the exact elimination of the residual vibration by modifying the existing command. The feedback controller, on the other hand, is designed based on the SMOFC such that the closed-loop system behaves like the reference model with input shaper, where the residual vibrations are eliminated in the presence of parametric uncertainties and external disturbances. An attractive feature of this SMOFC algorithm is that the parametric uncertainties or external disturbances of the system do not need to satisfy the so-called matching conditions or invariance conditions provided that certain bounds are known. In addition, a smoothed hyperbolic tangent function is introduced to eliminate the chattering phenomenon. Compared with the conventional methods, the proposed scheme guarantees not only the stability of the closed-loop system, but also the good performance as well as the robustness. Simulation results for the spacecraft model show that the precise attitudes control and vibration suppression are successfully achieved.     

基于现实飞行条件下的飞行员英语陆空通话教学研究

本文首先提出目前飞行员英语陆空通话课堂教学中存在的问题和不足，在此基础上，结合具体事例说明了实际通话中飞行员用语失误或误解所造成的飞行事故，强调了实际飞行条件下飞行员英语陆空通话综合能力提高的必要性和迫切性。最后分析并提出了飞行员英语陆空通话课堂教学方法改进的新举措。     

单帧FFT法在正弦扫描结构动特性试验数据处理中的应用

在正弦扫描结构动特性试验中,当扫描速率过快时,传统的Hilbert法和同相正交分解法处理结果误差较大。针对上述缺点,采用了单帧FFT法,并通过单自由度理论仿真算例和试验对方法进行验证。研究表明单帧FFT法具有更好的精度,处理结果的频率和幅值受试验扫描速率影响小,且没有"旁瓣效应",是一种更为有效的正弦扫描结构动特性试验数据处理方法。