无机型磷酸盐胶粘剂粘贴工艺对于有效粘贴的影响研究

为了满足部分结构热试验对传感器的粘贴要求,研究分析了无机型Al(OH)<,3>与H<,3>PO<,4>混合的基底胶粘剂粘贴工艺,对胶粘剂有效粘贴试件的影响因素进行了理论分析和试验对比.结果表明表面处理工艺及适当的固化工艺有利于胶粘剂有效地将传感器粘贴在试件上.     

Statistical study of energetic electrons in Jupiter’s inner magnetosphere by Juno/JEDI

The Juno spacecraft made the first in-situ observations of energetic particles in the polar region of Jupiter’s magnetosphere. After Jupiter Orbit Insertion (JOI) in July 2016, data from ~20 Juno perijoves (PJs) obtained by Juno/JEDI are accumulated, providing an excellent opportunity to study the long term spatio-temporal distribution of energetic particles in Jupiter’s radiation belt. We transform Juno’s position from a Cartesian to a magnetic coordinate system by tracing magnetic field lines based on a fourth order Runge-Kutta method. Then the fluxes of energetic electrons from PJ1 to PJ14 sorted by different locations in magnetic coordinate space and the data are well organized by the L-shell parameter. The variation of electron flux increases with L-shell. The deviation (the ratio of the 75th percentile to the 25th percentile) of 0.51 MeV electron flux varies from a factor of 1.23 near L = 9.5 to 27.57 near L = 15.5. However, the mean flux decreases by about one order of magnitude in the same region. The electron spectra at larger L-shells are softer than that at smaller L-shells. On the other hand, the electron flux decreases more rapidly with increased L-shell when the location is off the equator. Along an L-shell, the electron flux decrease at first and then increase again from equator to mid-latitude region. In addition, we compare the statistical results with the widely used GIRE2 model. JEDI data correspond well with the GIRE2 model when the L-shell is > 14.75. GIRE2 underestimate the electron flux for L-shell smaller than 13.25. These results of this analysis are applicable to estimate the effects of the radiation environment in Jupiter’s magnetosphere.     

星载电子设备元器件随机振动疲劳分析

星载电子设备通常要经历各种振动环境,在恶劣的随机振动环境中,设备中的元器件管脚及焊点容易出现疲劳问题。文章应用Miner疲劳损伤累积理论及三带宽技术,提出了一种实用有效的分析元器件管脚及焊点进行随机振动疲劳寿命的方法。     

甲基乙烯基生胶分子量的测定方法研究

本文提出以庚烷作溶剂，用粘度法测定甲基乙烯基生胶的分子量。经试验结果表明：本法与标准法用甲苯作溶剂测得的结果相一致。本法具有溶剂毒性小、溶解性好、准确度高，操作简便等优点。     

HP8350B扫频仪射频插件单元故障修理三例

针对HP8350B系列微波扫频仪射频插件单元的三例典型故障。介绍了其修理方法，同时就该类微波测量仪器在修理过程中应该注意的几个问题阐述了作者的意见。     

我国航空工艺设备成果及其转化措施

本文分析了国内外机床业的发展现状，介绍了近十几年来我国航空工艺设备研究的成果，并就当前形势下如何做好这些成果的转化工作提出了措施     

BEST APPROXIMATION BY NORMAL MATRICES WITH SPECTRAL CONSTRAINTS

考虑在给定谱约束和Ｆｒｏｂｅｎｉｕｓ范数意义下用正规矩阵最佳逼近一个给定复方阵的问题。给出了这个问题可解的充分必要条件,提出了求解这个问题的一个数值算法,并给出了一个数值例子。     

基于LMI的飞行控制系统H2/H∞状态反馈综合

针对同时存在模型参数变化和外界干扰这两种不确定性的飞机对象,本文采用基于ＬＭＩ的Ｈ２／Ｈ∞状态反馈综合方法进行控制器设计。仿真结果表明,闭环系统不仅对模型参数的变化具有鲁棒稳定性,而且对外界人有很强的抑制能力,系统的动态性能得到了很大的改善。