基于AD7714的激光对中仪的设计与实现

为了提高机械轴对中的效率和准确度,研制了基于AD7714的激光对中仪系统,该系统通过一定的测量手段对设备的定轴和动轴的相对位置进行检测和调整,以保证其位于同一条直线上。系统通过自行研制的硬件对任意角度的激光点的位置信息进行测量,并通过LabVIEW的图形化界面和编程环境对数据进行采集和处理,最后给出垂直偏差和水平偏差。     

叉流管－管型换热器二维温度场的数值分析

建立并导出叉流管－管型换热器传热过程的二维数学模型及相应的差分格式。对比实验数据和性能计算结果，表明数值方法是有效可行的，据此编制的计算机程序已成功地用于组合发动机空气预冷换热器工作过程的预测。     

模拟中性大气边界层中污染物传输与扩散的动力相似讨论

文章从湍流雷诺数相等出发,推导出风洞中模拟中性大气边界层动力相似准则一充分发展的湍流中,运动相似的流动动力也相似。文章还讨论了模拟烟流抬升和扩散的相似准则,概述了国内外一些主要实验室应用的近似模拟技术。     

A solar type U burst in the decimetric range

This paper analyzes a Type U burst at 1.0 – 2.8 GHz which occurred between 12:36:26 – 12:36:32 UT on 1992 August 22, observed by Ond ejov Observatory, Czech Republic. This may be the first example of Type U bursts in the decimetric range, as far as we know. From analysis we came to the following conclusion: (1) The frequency drift rates of the ascending and descending branches are 1.25 and 0.225 GHz/s, respectively, and the velocities of the electron beam are 0.38 c and 0.26 c, respectively; (2) The burst decay of the ascending branch is larger than that of the descending branch; (3) The variations of the maximum frequencies of instantaneous spectra with time appear as from the highest (1.92 GHz) to the lowest (1.0 GHz), then toward higher frequency (1.53 GHz) (this is consistent with that predicted by plasma emission theory); (4) The bandwidths of the ascending branch are about twice that of the descending branch (this may be caused by the larger drift rates of the ascending branch); (5) The temperature of the coronal loop apex is 6.3 × 10⁶ K; (6) The magnetic field at the top of the loop is greater than 9.2 G; (7) This U burst emission is plasma radiation at the second harmonic.     

卫星用半导体器件失效模式和机理分布

以中国空间技术研究院电子元器件可靠性中心1987～1990四个年度数百份失效分析报告为依据,得到卫星用半导体器件解剖前失效模式分布:逻辑失控占36.3%,开路占22.2%等;失效机理分布:铝腐蚀占1 6.3%,使用不当占14.6%等。该项研究以第一手数据首次全面、系统指出卫星用器件失效模式和机理。为卫星可靠性设计、优选器件厂及器件厂采取措施提供重要依据。     

Orbit determination and prediction of GEO satellite of BeiDou during repositioning maneuver

In order to establish a continuous GEO satellite orbit during repositioning maneuvers, a suitable maneuver force model has been established associated with an optimal orbit determination method and strategy. A continuous increasing acceleration is established by constructing a constant force that is equivalent to the pulse force, with the mass of the satellite decreasing throughout maneuver. This acceleration can be added to other accelerations, such as solar radiation, to obtain the continuous acceleration of the satellite. The orbit determination method and strategy are illuminated, with subsequent assessment of the orbit being determined and predicted accordingly. The orbit of the GEO satellite during repositioning maneuver can be determined and predicted by using C-Band pseudo-range observations of the BeiDou GEO satellite with COSPAR ID 2010-001A in 2011 and 2012. The results indicate that observations before maneuver do affect orbit determination and prediction, and should therefore be selected appropriately. A more precise orbit and prediction can be obtained compared to common short arc methods when observations starting 1 day prior the maneuver and 2 h after the maneuver are adopted in POD (Precise Orbit Determination). The achieved URE (User Range Error) under non-consideration of satellite clock errors is better than 2 m within the first 2 h after maneuver, and less than 3 m for further 2 h of orbit prediction.     

一类非线性系统的变结构控制问题

本文研究了简约型非线性控制系统的变结构控制问题,针对变结构控制切换函数的确定问题进行了深入研究,给出了一类非线性系统切换函数的确定方法。研究结果表明,该方法适用于一类难于或不能可控正则化和线性化的非线性控制系统的综合。最后通过仿真证实了该方法的有效性。     

多元共渗处理提高高速钢刀具加工钛合金的切削性能

用硬质合金切削钛合金已在许多航空工厂得到广泛应用,但在许多情况下仍然需要用高速钢刀具加工钛合金。采用多元共渗强化处理是一种改善高速钢刀具切削性能的方法。这种技术具有变形小、节能、成本低等特点。W18Cr4V高速钢经S-O-N-C-B五元强化共渗后,金相组织分为表层的化合物层(几μm)及其下的扩散层。扩散层由于渗入了固溶的C和N,并存在弥散的析出强化相,B元素使晶格严重畸变,扩散层的硬。     

叶栅绕流计算的高分辨率隐式解法

以一种性能优越的高分辨率格式为基础, 发展了其隐式解法, 提出并实现了与这种格式相适应的隐式边界处理过程, 从而显着提高了高分辨率格式的收敛速度。用不同来流条件下叶栅绕流数组计算结果与实验做了对比, 以说明解的准确程度和本文算法的效果。      

密闭舱压力控制特性

本文主要报告研制中的密闭舱压力控制系统的建模和特性分析。系统特性分析和计算机仿真结果表明此类系统的稳定性条件是容易满足的。理论分析和计算机仿真结果得到了试验结果的验证,证明该数学模型的正确性和可应用性。它对于今后的研制工作是有指导意义的。