Trajectory optimisation in electrical discharge machining of three-dimensional curved and twisted channels

Numerical control electrical discharge machining(NC EDM) is one of the most widely used machining technologies for manufacturing a closed blisk flow path, particularly for three-dimensional(3D) curved and twisted flow channels. In this process, tool electrode design and machining trajectory planning are the key factors affecting machining accessibility and efficiency. Herein, to reduce the difficulty in designing the electrode and its motion path in the closed curved and twisted channels, a heur...     

兆瓦级探月火箭空间核电源系统设计与性能研究

针对目前空间核电源在深空探测领域功率不足的问题，结合热离子热电转换空间核电源和碱金属热电转换空间核电源的发电方式，提出一种新型空间核电源。计算堆芯有效增殖因子、功率峰值因子、冷却剂空泡系数和停堆深度等安全性参数，并通过分析接收极功函数和碱金属热电转换系统电流密度等性能参数。之后，对比耦合发电系统与原热离子热电转换空间核电源和碱金属热电转换空间核电源的效率，发现新型耦合发电系统发电效率分别较另两种发电系统提高约6％和约10％。最后建立动态模型进行分析，确保核电源可以稳定运行，为大功率核电源设计提供理论依据。     

Smooth free-cycle dynamic soaring in unspecified shear wind via quadratic programming

Harvesting wind energy is promising for extending long-endurance flights, which can be greatly facilitated by a flight technique called dynamic soaring. The presented study is concerned with generating model-based trajectories with smooth control histories for dynamic soaring maneuvers exploiting wind gradients. The desired smoothness is achieved by introducing a trigonometric series parameterization for the controls, which are formulated with respect to the normalized time.Specifically, the per...     

基于条件生成对抗模型的遥感卫星影像重建技术研究

为了快速侦察未知区域的地貌信息，遥感卫星可对特定区域进行扫描以获取遥感卫星影像。当卫星经过国外未知区域时，部分卫星无法针对某特定区域进行长时间的驻留扫描，本文提出一种基于条件生成对抗网络模型（Conditional Generative Adversarial Network，CGAN）进行网络训练，前期将某方法获取的区域轮廓地形信息作为CGAN网络的生成网络和鉴别网络中的条件约束信息，通过网络生成器与判别器在训练过程中互相博弈产生特定的输出集，有效地实现由单张电子轮廓图像到对应卫星遥感图像的端到端的非线性映射。本文通过原真实卫星遥感图像与生成卫星遥感图像进行四种对比误差计算，平均误差、均方误差与结构相似度均高于99%，峰值信噪比高于30 dB，生成的图像与原图像之间具备高相似度，实现了在获取坐标定位轮廓信息的先验条件下，对特定区域进行遥感卫星影像内容重建技术。     

Optimal trajectory design accounting for the stabilization of linear time-varying error dynamics

This study is dedicated to the development of a direct optimal control-based algorithm for trajectory optimization problems that accounts for the closed-loop stability of the trajectory tracking error dynamics already during the optimization. Consequently, the trajectory is designed such that the Linear Time-Varying(LTV) dynamic system, describing the controller’s error dynamics, is stable, while additionally the desired optimality criterion is optimized and all enforced constraints on the traje...     

民用飞机发动机吊挂应急断离设计研究

发动机吊挂应急断离是民用飞机设计的关键核心技术之一，国外相关技术难以获取，国内以理论研究和提出主要思路为主，与工程实现存在差距。基于此，从适航标准入手，研究吊挂、保险销和机翼三者的应急断离设计载荷大小的关系，通过场景分析，研究界面结构强度计算的载荷确定方法。结果表明：吊挂应急断离设计仅需单独考虑发动机主载荷向上或主载荷向后工况，合理给定吊挂、保险销和机翼结构三者的应急断离设计载荷大小关系可有效降低结构重量；机翼/吊挂界面载荷方向则必须结合结构细节做具体的应急断离场景分析。     

DFCluster: An efficient algorithm to mine maximal differential biclusters for single pilot operations task synthesis safety analysis

With the continuous advancement of the avionics system, crew members are correspondingly reduced, and Single Pilot Operations(SPO) has attracted widespread attention from scholars.To meet the flight requirements in SPO mode, it is necessary to further strengthen air-ground coordination system integration, but at the same time, there will be some safety issues caused by resource integration, function fusion, and task synthesis. Aimed at the safety problems caused by task synthesis, an efficient d...