基于不变流形的高超声速飞行器动态面控制

针对存在未知气动参数的吸气式高超声速飞行器纵向运动控制问题,提出一种基于不变流形的自适应动态面控制方法.通过合理假设将高超声速飞行器纵向模型分解为弹道倾角回路和速度回路,分别实现对弹道倾角和速度参考指令的跟踪.弹道倾角回路被表达为严反馈形式进行控制器设计.采用基于不变流形的自适应方法实现了对未知参数的估计.所提出的自适应动态面控制方案能保证未知参数估计误差全局一致稳定和闭环系统全局有界稳定,且估计器和控制器设计不存在耦合,因此参数设计更加容易.仿真结果验证了该控制方法在参数估计方面的显著优势和良好的闭环系统性能.     

Imaging interplanetary CMEs at radio frequency from solar polar orbit

Coronal mass ejections (CMEs) represent a great concentration of mass and energy input into the lower corona. They have come to be recognized as the major driver of physical conditions change in the Sun–Earth system. Consequently, observations of CMEs are important for understanding and ultimately predicting space weather conditions. This paper discusses a proposed mission, the Solar Polar Orbit Radio Telescope (SPORT) mission, which will observe the propagation of interplanetary CMEs to distances of near 0.35 AU from the Sun. The orbit of SPORT is an elliptical solar polar orbit. The inclination angle between the orbit and ecliptic plane should be about 90°. The main payload on board SPORT will be an imaging radiometer working at the meter wavelength band (radio telescope), which can follow the propagation of interplanetary CMEs. The images that are obtained by the radio telescope embody the brightness temperature of the objectives. Due to the very large size required for the antenna aperture of the radio telescope, we adopt interferometric imaging technology to reduce it. Interferometric imaging technology is based on indirect spatial frequency domain measurements plus Fourier transformation. The SPORT spacecraft will also be equipped with a set of optical and in situ measurement instruments such as a EUV solar telescope, a solar wind ion instrument, an energetic particle detector, a magnetometer, a wave detector and a solar radio burst spectrometer.     

已知初始匹配对的图像四元松弛匹配算法

提出了已知初始匹配对的四元松弛匹配算法,该算法以向量旋转角的旋转和缩放不变性特征作为匹配对的优化准则,首先计算向量旋转角度差值,然后通过构造支持度函数和剔除策略选出最优匹配对.在初始错误匹配比例较高和游动误差较大的情况下能够实现正确匹配.通过大量图像实验证明,该算法在匹配速度和正确率上优于桑农松弛匹配算法.     

航空武器装备项目过程评估指标体系的构建

分析了航空武器装备项目的特点,提出了航空武器装备项目过程评估指标体系的设计原则;结合项目管理的相关知识,提出了航空武器装备项目过程评估的指标体系,并探讨了运用灰色关联理论确定评价指标权重的方法步骤.     

自稳火双旋流杯在非受限空间内的燃烧特性

采用试验方法研究了一种适用于切向驻涡燃烧室的自稳火双旋流杯在非受限空间内的燃烧特性.自稳火双旋流杯的方案特点是采用两级径向旋流器,燃油从中心离心喷嘴喷出,根据旋流器旋流强度和气量分配形成不同布局形式.在常温常压条件下,以RP-3航空煤油为燃料,测量了三种结构的自稳火双旋流杯火焰特性以及贫油熄火油气比,结果表明:随着内旋流器气量减少和旋流数增加,火焰稳定性将有所增强,但火焰长度及总体形状没有变化.      

攻击地面固定目标寻的导弹的一体化制导与控制(英文)

This paper presents a scheme of integrated guidance and autopilot design for homing missiles against ground fixed targets. An integrated guidance and control model in the pitch plane is formulated and further changed into a normal form by nonlinear coordinate transformation. By adopting the sliding mode control approach, an adaptive nonlinear control law of the system is designed so that the missile can hit the target accurately with a desired impact attitude angle. The stability analysis of the closed-loop system is also conducted. The numerical simulation has confirmed the usefulness of the proposed design scheme.     

电葫吊车数控化的原理与设计

本文结合一应用实例，具体介绍用微机对电葫吊车进行控制。文中也论述了实现电葫吊车数控化的原理及设计方法。     

受冲压作用固体发动机喷管堵盖应力分析

基于Ｖｏｎ Ｋａｒｍａｎ模型，对受冲击压力作用的喷管堵盖计算模型进行受力分析，计算考虑到了几何非线性和材料非线性的影响，得到了冲压作用下的喷管堵盖变形和应力分析结果。并对不同升压速率情况进行了对比分析，指出了升压速率对喷管堵盖结构受力影响的重要性。     

三坐标测量机上圆柱度评定的一个实用算法

给出一个用于三坐标测量机圆柱度误差评定的最小二乘法模型，大量计算结果表明该模型有很好的实用性。     

分布式防火墙对内网的安全保护

通过与传统防火墙的对比,简述了分布式防火墙的产生原因、结构、原理、特点及在保护内网安全方面的应用。