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鉴于某型多功能显示器故障率较高,外场排故时需由飞机平台通电或借用内场检测设备而带来的使用不方便情况,设计了适用于外场使用的便携式检测设备。具体介绍了检测设备的硬件设计、软件设计以及界面设计。该检测设备已交付外场使用,工作稳定可靠,满足外场排故需求。 相似文献
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通过分析航空发动机在外场保障工作中存在的不足,结合GJB 7079的标准规范,提出了对航空发动机保障信息系统的规划,为加强航空发动机的外场保障能力,规范航空发动机的外场质量监控提供了初步构想。 相似文献
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通过分析航空侦察装备保障的现状和建立新型航空侦察装备外场保障模式的技术条件,提出了"基于系统"的外场飞行保障新模式,讨论了这种保障模式的特点,以及外场通电、拆装、排故等检查工作情况。 相似文献
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基于Bayes变动统计理论的测试性外场统计验证方法 总被引:6,自引:3,他引:3
针对故障检测/隔离数据为"小子样"情况导致的测试性外场统计验证存在的周期长、验证结论置信度低等问题,研究并提出了基于Bayes变动统计理论的的测试性外场统计验证模型和方法。首先建立了不同寿命周期阶段故障检测率(FDR)的序化关系模型;然后以Dirichlet分布为先验分布,利用不同寿命周期阶段故障检测率先验估计值确定Dirichlet分布参数;在此基础上,融合"小子样、异总体"研制阶段增长试验数据和"小子样"外场使用数据,研究并提出了故障检测率的Bayes综合评估模型;引入Gibbs抽样方法求解故障检测率Bayes综合评估模型的复杂高维后验积分;最后在某机载稳定跟踪平台上开展了应用研究。结果表明本文方法能在较短的外场使用周期内,给出较高置信度的外场验证结论,为大型高可靠性装备测试性外场统计验证研究提供了重要的理论依据。 相似文献
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在结合部分型号的维修性外场评估的经验基础之上,形成一套适合外场试飞的维修性评估的体系方法.并结合现行标准的特点,对外场维修性评估标准的建立提出建议. 相似文献
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航空发动机在外场能够稳定、可靠地工作,得益于外场故障的准确判断和及时排除。斯贝发动机在外场通过使用动、静态检测仪(UT613、UT614),保证了发动机的排故需求。本文对如何利用该动、静态检测仪进行效率更高的工作,结合实践予以撂讨和研究。 相似文献
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在大量的外场统计和空测的基础上, 对某教练机发动机的外场使用载荷进行了分析研究, 得出其转速次循环服从威布尔分布, 并计算了其分布的密度函数。 相似文献
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Solar magnetic field is believed to play a central role in solar activities and flares, filament eruptions as well as CMEs
are due to the magnetic field re-organization and the interaction between the plasma and the field. At present the reliable
magnetic field measurements are still confined to a few lower levels like in photosphere and chromosphere. Although IR technique
may be applied to observe the coronal field but the technique is not well-established yet. Radio techniques may be applied
to diagnose the coronal field but assumptions on radiation mechanisms and propagations are needed. Therefore extrapolation
from photospheric data upwards is still the primary method to reconstruction coronal field. Potential field has minimum energy
content and a force-free field can provide the required excess energy for energy release like flares, etc. Linear models have
undesirable properties and it is expected to consider non-constant-alpha force-free field model. As the recent result indicates
that the plasma beta is sandwich-ed distributed above the solar surface (Gary, 2001), care must be taken in modeling the coronal
field correctly. As the reconstruction of solar coronal magnetic fields is an open boundary problem, it is desired to apply
some technique that can incorporate this property. The boundary element method is a well-established numerical techniques
that has been applied to many fields including open-space problems. It has also been applied to solar magnetic field problems
for potential, linear force-free field and non-constant-alpha force-free field problems. It may also be extended to consider
the non-force-free field problem. Here we introduce the procedure of the boundary element method and show its applications
in reconstruction of solar magnetic field problems.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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流-固耦合计算的应用研究 总被引:1,自引:0,他引:1
为了解决用常规算法求出的流体与固体对流换热系数的不真实性问题,采用了流固耦合计算方法计算固体壁面的温度.其中采用模型模拟湍流流动,用壁面函数法修正处于流场内部的固壁,通过固体和流体双向耦合换热计算,得出了整个流场、温度场包括(固体部分和流体部分)的分布. 相似文献
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以CNKI数据库为数据源,选取1 200余篇作战效能评估研究领域的文献为对象,采用文献计量与科学知识图谱技术,进行分析和对比,并绘制该领域研究的可视化图谱。通过图谱分析,梳理该研究领域的演进历程,探讨该领域的研究热点和前沿,以提高对该领域的理解和认知,为该领域的研究提供重要参考。 相似文献
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为了揭示电弧喷射推力器内部电磁场特征及其与高温电离气体间的相互作用机理,建立了比较完善的电磁场模型,详细讨论了电磁场数值模拟方法及其计算效果.模型同时考虑了电场力、洛仑兹力和电子压强梯度对传导电流的贡献,由电子动力学方程和粒子微观碰撞理论推导出电流方程,由麦克斯韦方程组推导出电磁场控制方程,采用包括强隐过程(SIP)迭代法在内的十种迭代方法求解离散的电磁场方程.研究表明,SIP迭代法是适用于电弧喷射推力器电磁场模拟的快速有效的方法,模型能够准确地反映推力器内部电磁场与高温电离气体间的相互作用机理. 相似文献
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Benoit Langlais Vincent Lesur Michael E. Purucker Jack E. P. Connerney Mioara Mandea 《Space Science Reviews》2010,152(1-4):223-249
Magnetic field measurements are very valuable, as they provide constraints on the interior of the telluric planets and Moon. The Earth possesses a planetary scale magnetic field, generated in the conductive and convective outer core. This global magnetic field is superimposed on the magnetic field generated by the rocks of the crust, of induced (i.e. aligned on the current main field) or remanent (i.e. aligned on the past magnetic field). The crustal magnetic field on the Earth is very small scale, reflecting the processes (internal or external) that shaped the Earth. At spacecraft altitude, it reaches an amplitude of about 20 nT. Mars, on the contrary, lacks today a magnetic field of core origin. Instead, there is only a remanent magnetic field, which is one to two orders of magnitude larger than the terrestrial one at spacecraft altitude. The heterogeneous distribution of the Martian magnetic anomalies reflects the processes that built the Martian crust, dominated by igneous and cratering processes. These latter processes seem to be the driving ones in building the lunar magnetic field. As Mars, the Moon has no core-generated magnetic field. Crustal magnetic features are very weak, reaching only 30 nT at 30-km altitude. Their distribution is heterogeneous too, but the most intense anomalies are located at the antipodes of the largest impact basins. The picture is completed with Mercury, which seems to possess an Earth-like, global magnetic field, which however is weaker than expected. Magnetic exploration of Mercury is underway, and will possibly allow the Hermean crustal field to be characterized. This paper presents recent advances in our understanding and interpretation of the crustal magnetic field of the telluric planets and Moon. 相似文献
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为了研究水润滑高分子材料轴承的微观界面的流场特性,本文以单个微凹体中的流场作为研究对象,建立了单个微凹体流动模型。采用多松弛格子玻尔兹曼方法MRT-LBM (multi-relaxation time lattice Boltzmann method)对单个微凹体的流体流动问题进行数值模拟。研究了流场中速度的变化规律,以及流场中流线分布随雷诺数的变化规律。结果表明当雷诺数较低时,流场处于稳定性流动状态;当雷诺数达到一定程度时,流场处于周期流动状态;当雷诺数很高时,流场处于湍流运动状态。探究微观流场中复杂的变化规律,为研究水润滑高分子材料轴承的润滑和摩擦性能提供一些理论支撑。 相似文献