低空突防任务下综合飞行/推进系统的建模与仿真

建立了综合飞行／推进系统的数学模型，介绍了飞机全维非线性数学模型和涡轮风扇发动机非线性部件级数学模型的建模及综合方法。对飞机执行地形中随任务时，飞行员调节飞行速度的方法与基于总能量的调节飞行速度的方法进行了比较。结果表明，基于总能量的方法比飞行员直接控制飞行速度能够减小发动机的燃油消耗，降低发动机的磨损，进而可以增加飞机的航程，延长发动机的使用寿命。     

传输/反射法测量复介电常数的三个方程研究

介绍了利用传输／反射参数测量复介电常数的三个方程。利用奇偶模方法分析传输线与二端口网络，得到传播常数与归一化特性阻抗的解析解。进而得到确定复介电常数的三个方程。利用这些方程仅用一次测量解决已有传输／反射法中存在的低损耗材料的厚度谐振问题、多值性问题及其它问题。讨论了利用这三个方程通过一次测量解决上述问题的方法并分析了这些方程的测量不确定度。最后给出了实验结果。     

新型的超宽带正交接收系统幅相误差实时的数域均衡方法

文中对超宽带正交解调接收系统的幅相误差进行了分析,针对文[1]均衡方案的缺点,然后在此基础上针对系统超宽带的特点提出一种新的自适应实时数域均衡法。同时,针对系统超宽带的特点对串行算法进行了修改,提出一种适合于FPGA高速实现的流水算法。并对这两种算法进行了仿真比较。     

用准光腔自动测试大面积介质复介电常数的平面分布

介绍了用准光腔法自动测量某大面积介质片上不同位置的复介电常数,并且做了误差分析.实验表明,此系统可在3 mm波段下对大面积材料的复介电常数分布进行测量,具有大面积、快速、不接触测量且分辨瑕疵的特点.误差范围为|△ε'/ε'|≤10%;|△tanδ |≤20%tanδ+1×10-4.     

一种新的综合TF／TA最优航迹算法

综合ＴＦ／ＴＡ是新一代低空突防技术，ＴＦ／ＴＡ最优航迹的计算是其控制系统的核心。文中提出了一种新的综合ＴＦ／ＴＡ最优航迹算法，它用动态规划和树型搜索相结合的方法，实时计算综合ＴＦ／ＴＡ最优航迹。算法考虑了飞机机动能力的约束，使最优航迹在不需要平滑处理时就是一个可实现航迹。另外还考虑了威胁的影响，使最优航迹能有效地进行威胁回避。计算结果表明，所得的最优航迹具有综合地形跟踪／回避和威胁回避的能力。     

复杂凸凹曲率飞机蒙皮充液成形技术研究与应用

随着飞机气动、隐身等性能要求的提高,飞机外形曲率更加异形化,大量应用复杂凸凹曲率蒙皮,传统的拉伸成形方法已经不能完全满足新一代飞机蒙皮加工的要求。基于生产某型号飞机复杂凸凹曲率蒙皮这一背景,介绍了充液成形基本原理及关键技术,利用有限元数值模拟方法,分析板材充液成形过程中液室压力、厚度减薄率、板材失稳及贴胎度的变化规律,优化工艺参数,并且根据数值模拟结果指导工业生产。理论分析和现场实践证明:充液成形技术为复杂凸凹曲率蒙皮零件的制造提供了新的工艺方法,满足新一代飞机的凸凹曲率外形蒙皮的制造要求。     

An energy-based coupling degradation propagation model and its application to aviation actuation system

The degradation of components in complex mechatronic systems involves multiple physical processes which will cause coupling interactions among nodes in the system. The interaction of nodes may be carried out not only by physical connections but also by the environment which cannot be described by single network using the traditional methods. In order to give out a unified model to quantitatively describe the coupling degradation spreading by both physical connections and environment, a novel Energy-Flow-Field Network (EFFN) and a coupling degradation model based on EFFN are proposed in this paper. The EFFN is driven by energy flow and the state transition of spatially related nodes is triggered by the dissipation energy. An application is conducted on aviation actuation system in which the degradation spreading by fluid-thermal-solid interaction is considered. The degradation path and the most probable fault reason can be obtained by combining the state transition and energy output of nodes, which is consistent with the given scenario.     

Exploiting global information in complex network repair processes

Robustness of complex networks has been studied for decades,with a particular focus on network attack.Research on network repair,on the other hand,has been conducted only very lately,given the even higher complexity and absence of an effective evaluation metric.A recently proposed network repair strategy is self-healing,which aims to repair networks for larger compo nents at a low cost only with local information.In this paper,we discuss the effectiveness and effi ciency of self-healing,which limits network repair to be a multi-objective optimization problem and makes it difficult to measure its optimality.This leads us to a new network repair evaluation metric.Since the time complexity of the computation is very high,we devise a greedy ranking strategy.Evaluations on both real-world and random networks show the effectiveness of our new metric and repair strategy.Our study contributes to optimal network repair algorithms and provides a gold standard for future studies on network repair.     

增强型近地警告系统虚假地形警告原因分析

以空客A320飞机为例，针对增强型近地警告系统出现的虚假地形警告，引入几何高度对解决虚假地形警告的原因进行了分析。     

复杂曲面零件散乱点云特征点提取

复杂曲面零件的几何特征提取对加工质量的检测及逆向重构具有重要意义。提出了一种复杂曲面零件散乱点云特征点提取方法。首先,提出了基于高斯权重的邻域主成分分析的方法,通过估计每一点邻域的局部变化程度对点云模型进行初始标记;然后,采用基于标记的自动识别法实现特征点的提取;最后,通过特征点聚类的方式去除了特征点集中的异常点,完善了提取的点云特征。该方法直接操作于散乱点云,无需任何的拓扑连接信息。试验结果表明:该方法简单、有效,不需要过多地人为调节参数,特征点提取完整。