某型发动机典型可修复附件可靠性分析

针对传统方法评估航空发动机可修复件可靠性指标的部分不合理性,从外场可靠性信息特点着手,结合可修复件的结构特性,应用随机过程理论完善整个可修复附件的可靠性评估过程。基于可靠性评估模型、可靠性评估指标及外场数据等特点,提出了某型发动机可修复附件可靠性评估分类方案,为合理确定可修复附件的可靠性和维修性指标奠定了基础。     

Robotic vision technology for space station and satellite applications

This paper presents the robotic vision technologies newly developed for satellites and space station robotic applications at the Pattern Analysis and Machine Intelligence (PAMI) Laboratory of the University of Waterloo and at the Vision, Intelligence and Robotics Technologies Corp. (VIRTEK). The first part of the paper presents how the PAMI-VIRTEK Vision technologies are engineered to support the STEAR (Space Station, Strategic Technologies in Automation and Robotics Program) sponsored by the Canadian Space Agency. The second describes the use of stereo CCD camera for sensing the deformed shape of a third generation satellite. It addresses the notion of shape interpolation and error reduction.     

A space-fed phased array for surveillance from space

A space-fed radar antenna called a venetian blind is proposed for all-weather wide-area surveillance from space. Radar requirements for tasked and untasked operation are discussed, and the process of selecting the venetian blind concept, which can support both, is described. In its untasked form (essentially a space-fed passive lens), it achieves off-axis squint angles of many beamwidths with negligible performance degradation. It is inherently insensitive to mechanical distortion and is a first step in the evolution to the more complex tasked system antenna. The antenna lens consists of easily manufactured slats with microstrip dipole radiating elements and matching networks on a dielectric substrate. Phase control is achieved with low-loss delay lines in the passive lens or active transmit/receive modules if electronic scan is desired     

三维实体模型向二维工程图纸的转化

本文在基于ＡｕｔｏＣＡＯＲ１２支撑软件的基础上，利用其ＡＤＳ和ＡＭＥ函数，讨论了三维实体模型向二维工程图纸的转化的问题，分析了三维实体的三向投影及三个视图的对齐关系。     

NUMERICAL SIMULATION OF IMPACT RESPONSE OF COMPOSED CERAMIC/COMPOSITE ARMOUR

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＩＭＰＡＣＴＲＥＳＰＯＮＳＥＯＦＣＯＭＰＯＳＥＤＣＥＲＡＭＩＣ／ＣＯＭＰＯＳＩＴＥＡＲＭＯＵＲＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＩＭＰＡＣＴＲＥＳＰＯＮＳＥＯＦＣＯＭＰＯＳＥＤＣＥＲＡＭＩＣ／ＣＯＭＰ...     

Design of an innovative multi-stage forming process for a complex aeronautical thin-walled part with very small radii

In this paper, an aeronautical thin-walled part with a complex geometry which has several sharp bends and curvatures in different directions was investigated. This kind of part is difficult to be manufactured only in one stage. Therefore, an innovative multi-stage active hydroforming process assisted by the rigid forming method was designed. In addition, an optimized blank geometry is obtained. In fact, the main focused point of this paper is to propose a new small radius rounded corner forming technique and analyze the mechanism. Two kinds of forming modes of changing a big rounded corner into a small one, which are related to different tangential positions of the die in the process of calibration, are analyzed theoretically. Meanwhile, the stress and strain states of the deformation region are compared. The relationships between the minimum relative radii of rounded corners I and II in the first stage and the hydraulic pressure are calculated by the bending theory. Finally, the influences of the tensile-bulging effect and the interface condition of the double-layer sheet on the forming quality of the specimen are investigated. The achieved results can make a foundation for utilizing the proposed method in forming of thin-walled parts with very small radii.     

飞行器野外长时间热待机状态方位姿态研究

运用高精度光电自准直仪对飞行器在野外长时间热待机状态的方位姿态变化进行监测,采用基于经纬仪和标杆仪的基准边修正方法进行数据修正。飞行器的不同部位固定温度传感器,通过工业计算机采集和处理所有数据分析得出飞行器方位姿态温度变化之间的关系,为飞行器发射技术的发展提供了技术上的参考依据。     

航空发动机离心叶轮的多学科设计优化

对一种用于离心叶轮多学科设计优化的方法进行研究,学科涉及气动、结构、强度。建立离心叶轮多学科设计优化数学模型,开发多学科设计优化软件。采用此法对某航空发动机离心叶轮进行多学科设计优化,有效降低了叶片和轮盘的最高应力,减轻了重量。     

脉冲展开式飞网质量分布与展开稳定性优化

针对脉冲展开式飞网的展开稳定性问题，从网面质量分布角度开展研究。首先基于传递矩阵方法、集中质量法和反比例函数推导建立了较优的网面质量分布模型。然后结合遗传算法优化得到了网面最优的质量分布状态，并通过大量数值仿真和回归分析得到了网面质量分布经验公式。提出的网面质量分布模型有效降低了网面质量分布问题中的优化变量个数，提升了网面质量分布最优解的求解效率。网面质量分布最优解所对应的网面展开稳定性得到大幅提升，网面质量分布经验公式对应的网面展开状态与最优解对应的网面展开状态基本一致。结果表明，将网面质量分布模型和网面质量分布经验公式应用到脉冲展开式飞网将有效提升飞网的展开稳定性。