真空低温环境红外亮温标准装置设计

对遥感技术现状及面临的问题进行了介绍，明确了建立真空低温环境红外亮温计量标准装置的意义，对国内外研究现状进行了梳理，对研究的标准装置的技术路线和设计方案进行了详细叙述。     

Assessment of space debris collisions against spacecraft with deorbit devices

Deorbit methods have been employed to remove space debris from orbit. One of these methods is to utilize atmospheric drag. In this method, a membrane loaded into the spacecraft is expanded to increase atmospheric drag. Although this method works without requiring fuel, it has the disadvantage of a high risk of collision with other debris owing to its larger area. Area-time product and energy-to-mass ratio have been used as indices to evaluate the risk of collisions between spacecraft and debris. However, the evaluation criteria were uncertain because these two indices are independent. In this paper, we propose a new evaluation index, single-sheet collision factor (SSCF), that comprehensively evaluates the collision risk based on experiments simulating debris collisions. As a result of the hypervelocity collision experiment, we found that the penetration-area mass of the spacecraft affects the severity of debris collisions. In this paper, the product of the exterior-wall thickness, the exterior-wall density, and the space debris cross-sectional area defines the penetration-area mass of the spacecraft. Furthermore, we compare and evaluate various deorbit methods using SSCF. The comparison showed that the penetration-area mass of the SSCF could be quantitatively determined for the debris-collision severity due to difference in structural materials of spacecraft. SSCF will be used to create rules for space-environment conservation with the expansion of the space-development market.     

微细电解射流喷射装置研制与工艺试验

为提高微细电解射流加工效率及加工质量,研制了专用喷射装置,并利用该装置进行了初步工艺试验。结果证明该装置保证了电解液在其腔体中能够得到充分"负极化",且能获得满足加工要求的稳定破碎长度,满足了电解射流加工试验要求。     

Neural Networks Combined with Importance Sampling Techniques for Reliability Evaluation of Explosive Initiating Device

Concerning the issue of high-dimensions and low-failure probabilities including implicit and highly nonlinear limit state function, reliability analysis based on the directional importance sampling in combination with the radial basis function (RBF) neural network is used, and the RBF neural network based on first-order reliability method (FORM) is to approximate the unknown implicit limit state functions and calculate the most probable point (MPP) with iterative algorithm. For good efficiency, based on the ideas that directional sampling reduces dimensionality and importance sampling focuses on the domain contributing to failure probability, the joint probability density function of importance sampling is constructed, and the sampling center is moved to MPP to ensure that more random sample points draw belong to the failure domain and the simulation efficiency is improved. Then the numerical example of initiating explosive devices for rocket booster explosive bolts demonstrates the applicability, versatility and accuracy of the approach compared with other reliability simulation algorithm.     

大型客机先进翼尖装置综合特性研究

 翼尖装置由于其良好的气动特性在航空界得到了广泛应用,然而它也使飞机的颤振及结构重量特性发生了变化。为了探求翼尖装置的综合特性,利用数值模拟方法对大型客机上最先进的3种翼尖装置(融合式、鲨鱼鳍式和阶梯式)进行了气动、颤振及重量3个方面的综合研究。3种翼尖装置减阻效果明显,但同时结构重量亦增加。翼尖装置均降低了机翼颤振速度。研究结果表明:加装翼尖装置后机翼颤振形态取决于翼尖装置的形式。相对于机翼颤振速度,翼尖装置形式对机翼颤振速度的影响是小量(1%~7%),且翼尖装置减阻和机翼压心外移的综合重量增益,为机翼结构设计提供了一定的设计空间。     

国外风洞天平校准技术研究进展

在简述风洞天平校准原理的基础上,归纳分析了国外风洞天平校准台的主要类型及特点;阐述了美欧在风洞天平校准技术方面的发展理念和开展的关键技术研究。     

一种串并转换器件单粒子效应试验研究

针对型号用新型器件抗辐射能力评估的需要,研制了串并转换器件单粒子效应检测系统,并对卫星型号中准备使用的一款26位串并转换器件进行了单粒子效应评估试验,得到了器件抗单粒子锁定的阈值,并发现该器件在单粒子辐照下会出现连续位输出错误。结合器件版图、结构分析了单粒子效应造成连续位错误的原因,为器件厂家后续设计改进和卫星型号进行系统级抗辐射加固设计提供了依据。     

边界扫描技术在电路板故障诊断中的应用

现代飞机中使用的电路板大量采用集成度很高的IC,尤其是BGA器件。传统的测试方法已经无法进行或者测试效率很低,并且测试的覆盖率也不高,电路板调试工作极为困难,迫切需要一种高效的测试手段来解决硬件测试中遇到的难题。文章采用边界扫描技术设计的电路板自动测试设备（ATE）很好的解决了高性能电路板测试的难题。     

Optical orbital debris spotter

The number of man-made debris objects orbiting the Earth, or orbital debris, is alarmingly increasing, resulting in the increased probability of degradation, damage, or destruction of operating spacecraft. In part, small objects (<10 cm) in Low Earth Orbit (LEO) are of concern because they are abundant and difficult to track or even to detect on a routine basis. Due to the increasing debris population it is reasonable to assume that improved capabilities for on-orbit damage attribution, in addition to increased capabilities to detect and track small objects are needed. Here we present a sensor concept to detect small debris with sizes between approximately 1.0 and 0.01 cm in the vicinity of a host spacecraft for near real time damage attribution and characterization of dense debris fields and potentially to provide additional data to existing debris models.