异形排气管的热态气动试验

在发动机活动试车台上，对全尺寸的从环形过渡到腰果形的发动机排气量，进行了热态的出口压力和温度分布测试，实验结果表明，排气管出口截面的上部存在有严重的低压区，出现气流倒流的现象，产生的原因是由于发动机排气管的上壁面的扩张角过大造成的，排气管出口夫面温度由上向下不断提高，上部因受冷气倒流的影响，温度只有９０℃左右，而对应排气管环形部分直接排出燃气，由于未受冷空气的掺混，使出口截面下半的气流最调达度４２     

基于功率裕度的某型发动机全寿命性能研究

随着使用时间不断增加,研究飞行队所有选装ARRIEL2S系列发动机全寿命性能变化趋势的必要性突显.针对SRRIEL2S系列发动机全寿命性能参数变化特点,提出使用基于可几误差舍弃理论处理发动机功率校验数据,分区间描绘该系发动机全寿命性能指标变化趋势,给出该系发动机全寿命性能特点,为机务工程人员监控该系发动机提供有利依据；提出延长功率校验间隔的假设,并在理论上做了充分论证,为节约该系发动机运行成本提供一个明确及可行的方向.     

Multi-station observation of ionospheric disturbance of March 9 2012 and comparison with IRI-model

The magnetic storm of 9 March 2012 is a single step intense storm (Dst = −143 nT) whose main phase begins around 0100 UT and lasted for almost 11 h. The increases in NmF2 recorded 33% and 67% incidence respectively during the main and the recovery phase of the storm at the stations considered. The increase in hmF2 occurred concurrently with the increase in thickness parameter B0 between 0000 and 1100 UT, and a simultaneous decrease in the shape parameter B1 for the entire mid-latitude stations. Generally, B1 responded to the storm with a decrease away from the quiet day average, and decreased simultaneously with the increase in NmF2. B0 displays higher variability magnitude during daytime than the nighttime period. The occasional differences in the response of the ionospheric parameters to the storm event are attributed to longitudinal differences. Variation in hmF2 and NmF2 is projected to change in B1, but the rationale behind this effect on B1 is still not known and therefore left open. The two IRI options over-estimate the observed values with that of URSI higher than CCIR. The over-estimation was higher during the nighttime than the daytime for NmF2 response for the mid-latitude stations and the reverse for the equatorial station. A fairer fit of the model with the observed for all parameters over Jicamarca suggests that equatorial regions are better represented on the model. Extensive study of B1 and B0 is recommended to arrive at a better performance of IRI.     

供距离测量用的光波长度标准

介绍用相位测距仪实现波长标准及在大长度范围内传递长度单位尺寸的情况。其传递精度好于通常采用方法。     

The 3-step DLR–ESA Gossamer road to solar sailing

The 3-step Gossamer road map to solar sailing is presented that has been agreed between DLR and ESA in November 2009. The main and exclusive purpose of that project is to develop, to prove, and to demonstrate the solar sail technology as a safe and reliably manageable propulsion technique for long lasting and deep space missions. Since the development of the solar sail technology is quite a complex task, presently at the DLR implemented solar sail related research activities will be presented as well.     

激光深熔焊接等离子体发射光谱诊断研究

综述了激光等离子体发射光谱诊断的基本假设;介绍了电子温度、密度光谱计算最常用的方法;同时综述了国内外激光焊接等离子体光谱诊断的研究进展.旨在对激光焊接等离子体光谱诊断基本理论和当前的研究进展进行全面的梳理,并对开展激光焊接等离子体光谱试验工作提供理论支持和技术参考.     

8400压力测量采集系统的校准

在压力测量的实际应用中,压力校准成为一种新的技术需求。本文介绍了8400压力测量系统的结构组成及特点,对该系统提出一种切实有效的校准方法。通过该校准方法,可保证8400压力测量系统的准确可靠,为工程实际应用提供更好的技术支撑。     

透镜-反射镜式测量镜对干涉微位移测量的影响

采用基于透镜-反射镜式逆反射光路的干涉仪进行微位移测量时,被测位移会引起测量光束的波面变化。本文对这种波面变化和其对位移测量结果的影响进行了分析,推导出了波面变化引起的位移测量误差与透镜的焦距/有效孔径之比和位移的近似关系。对合理使用基于透镜-反射镜的逆反射方法,发挥其在干涉微位移测量中的优势,避免其不足,具有指导作用。     

大尺寸测量系统配置中包络性与可达性分析

构建了包络性和可达性分析的原理与公式，定量判定当前测量设备空间位置是否合理，为实现在大尺寸测量方案规划阶段对测量设备的可行空间进行快速有效的规划提供依据。阐述了大尺寸测量系统总体架构与阶段任务划分，定义了包络性与可达性的输入输出关系。论述了包络性与可达性的原理与公式，包括可测量体素和外包络体的定义、数学模型和推导公式以及判定公式。最后，在CATIA环境下开发包络性和可达性分析工具，并以机翼翼肋为例，对该翼肋上待测关键特征进行包络性和可达性仿真分析。仿真结果表明，该包络性与可达性分析的原理与公式是可行的。     

预防性检测系统设计

导弹贮存期间经历多次测试维修,检测数据繁杂,只有更好地利用其现场数据才能更合理预测导弹寿命及检测时间。结合装备失效率曲线,提出了4种导弹现场检测数据采集方案,设计了一套预防性检测系统。以方案1的数据进行算例分析,结果验证系统的正确性与实用性。