歼击机结构故障的模式识别与参数辨识新方法

针对自修复飞行控制系统的故障,采用基于精确线性化的方法,在原空间和特征空间提出了基于双假设/多假设（增强型）概率统计学的模式识别与参数辨识方法,给出了结构故障的可识别性和可辨识性的判别准则,并以某型歼击机为例进行了仿真研究。     

某型压气机轴流级改型静叶设计

通过对某原型轴流级静叶的分析, 并对轴流压气机设计中采用的端部处理技术进行分析的基础上, 提出了静叶改型设计以及端部处理方案, 并进行了通流计算和造型。对改型设计中的双排静叶参数进行了优化、采用端部处理技术以及任意叶片造型, 提高了轴流级效率。      

基于改进Faster R-CNN的失效卫星部件检测方法

基于光学图像对失效卫星部件的精确检测可以为失效卫星的定位与捕获等任务提供支撑。然而,失效卫星部件多为密集小目标,且其光照条件变化较大,这导致一般主干网络出现特征表征分辨率低,小目标漏检等问题。针对上述问题,提出了一种基于改进Faster R-CNN的失效卫星部件检测方法。该方法在Faster R-CNN的基础上,融合高分辨网络构建新的特征提取主干网络,以获得可靠、高分辨率的特征表达式。其次,在模拟真实空间环境的条件下,利用1：1的嫦娥卫星模型构建了一个信息丰富的失效卫星数据集。用该数据集进行验证,结果表明：本文方法的平均精度为93.6%,其与Faster R-CNN和Cascade R-CNN相比,对小部件检测的准确率与召回率分别平均提高了9.8%与5.4%。该方法可有效检测失效卫星部件。     

管道清洁生产的特点和实施意义

本文介绍了石油管道施工的特点,对管道施工中的主要清洁生产问题做了阐述,指出能否更好的解决施工与环境保护之间的关系,最大限度的降低施工给环境带来的负面影响,已经成为一个管道施工企业综合竞争力的表现,是管道施工企业生长发展,可持续进步的重要前提,也是企业社会责任的充分体现.     

A methodology for constructing the aircraft design schema

Aircraft collaboration design is based on a unified set of schemas containing data and model representations and interfaces across disciplines. The aircraft design schema is a central data model that specifies the paradigm for the representation of a full lifecycle model of aircraft design. The construction of the schema currently lacks theoretical guidance. This paper designs a novel methodology to construct the aircraft design schema, a fully functional, logical, and self-consistent methodology. The methodology defines a schema matrix that includes implementation strategies, principles, processes, meta-object facility, views, scenarios, and products. The aircraft conceptual design schema is constructed according to the methodology, which is a hands-on approach to help understand the concept and implementation. The features of the methodology are analyzed, and the methodology and the aircraft conceptual design schema are presented to address the pain points of multiple solution trade-offs, multiple iterations, and multidisciplinary coupling in aircraft conceptual collaboration design.     

航空发动机典型材料超高周疲劳试验技术研究综述

航空发动机作为飞行器最关键、最核心的部位，长期服役于高温、高载等极端环境，疲劳失效是导致发动机结构破坏的主要原因之一。随着工业的发展，发动机材料的超高周疲劳问题日益凸显。本文总结了发动机典型材料超高周疲劳关注领域的研究现状，对当前超高周疲劳试验技术的应用情况进行了阐述，包括超高周轴向振动疲劳、弯曲振动疲劳、扭转振动疲劳、复合振动疲劳等试验加载技术以及温度控制技术、损伤监测技术，并对我国航空发动机典型材料超高周疲劳试验技术的发展做出展望。     

Martian Buildings: Design loading

Multiplanetary life has been studied by scientists as a way to supply energy or sustain human life in the future. Mars is likely to be man’s first destination, colonization using onsite structural construction would be one of the main options. The first step to designing a reliable building is to know the applied structural loads and to have an accurate design load combination. Due to lack of complete knowledge, short span of recorded data, Martian environment, and hazardous environment that Martian structures face, constructed Martian structures should behave appropriately under the highest likely live, dead and environmental loads either simultaneously or as a worst-case scenario. The present study evaluated and calculated probable Martian structural loads, including live, internal pressure, snow, gravity (dead), dust accumulation, thermal stress, wind, marsquake, asteroid, and meteoroid impact loads and their effects. Information was gathered from previous studies and valid data from Martian landers, rovers and orbiters. Wind loads were calculated based on the over 6.5 years of data recorded by Vikings 1 and 2, temperature and winds for InSight (TWINS) sensor. A wind shear exponent and wind profile have been proposed for a Martian flat terrain construction site. Marsquake lateral loads, frequency content and seismicity were assessed using data from the seismic experiment for interior structure (SEIS) and the Viking 2 seismometer. Considering the high influx of micrometeoroids, their penetration distance, impact loads and their effects on structures were calculated. The annual probability of an asteroid impact on a settlement was assessed for a 30-year mission. A load map for Martian residential buildings that considers the worst-case scenario in which a Martian structure should be designed based on them has been proposed.