共查询到20条相似文献,搜索用时 62 毫秒
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通过对飞机运行过程中启动活门出现的故障进行收集、分类和描述,剖析启动系统工作原理、启动活门组成及工作原理,判断故障发生的原因,提出排故的方法,为一线飞机维修人员高效完成启动活门排故工作提供参考. 相似文献
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通过分析放气活门密封性不合格故障产生的原因,探索排除放气活门密封不合格故障的方法,改进设计密封圈结构,保证了发动机的工作可靠性. 相似文献
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外流活门故障是A320系列飞机常见故障,故障严重时会引发座舱压力异常,飞行中造成需要下降高度的情况,地面则会因触发警告信息造成飞机停场。并且,外流活门整体组件属于高价值周转件,整体送修修理工时及物流成本花费不菲,而外流活门组件中的电子模块、电机属于可以单独拆换的部件,精确定位子部件故障,减少外流活门整体拆换,对降低机械延误率和维修成本可以起到积极作用。 相似文献
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为解决某型飞机高空飞行后座舱盖气动系统内存储的氨气大量泄漏的问题,通过对该系统的减压器组件返修件开展工作环境模拟试验,确定故障原因为某型安全活门在低温条件下异常开启,进而对该型安全活门的产品结构原理、零件受力状态和低温环境影响进行分析研究。论证了安全活门壳体尺寸控制不当、弹簧预紧力偏大、安全活门内部间隙过小,在低温作用下活门橡胶面收缩并脱离阀口是导致泄漏的根本原因。提出了在产品维修过程中,采取合理控制壳体的装配尺寸及活门内部间隙,并通过带压低温试验来模拟实际工作条件验证产品工作性能的措施,能够有效降低同类故障的发生率。 相似文献
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通过对温度控制活门所处飞机系统、作用、原理及故障类型进行分析,结合实际维修措施,总结维修经验,为企业打造维修精品项目。 相似文献
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某航空维修单位初期修理的A320大翼防冰活门连续出现低小时返厂情况,为此从活门工作原理出现,推演触发故障信息的条件,优化了修理程序,很大程度上解决了该活门低小时返厂问题。 相似文献
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离心式恒加速度试验系统基本参数研究 总被引:1,自引:0,他引:1
通过对离心机加速度方向、加速度数值、速度波纹、加速度梯度等基本参数特性的分析,得出离心机设计、使用及测量等方面的有效方法.以常见的2种100 kg转臂式恒加速度离心试验机SY31-100型与SY31-100A型为例进行比较,分析试品在某一设定加速度试验时,不同的点可能承受的最大和最小加速度,得出减少试验样品上各点试验加速度误差的处理方式. 相似文献
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空间站微重力环境研究与分析 总被引:3,自引:0,他引:3
太空中的微重力环境对基础科学研究和新技术开发具有重要意义,为了满足未来我国空间站开展微重力科学实验的需求,需要对空间站上的微重力水平进行分析和评估,指导高微重力要求实验载荷的布局和微重力实验期间的飞行任务规划。空间站上的微重力水平用加速度值度量,通常可以分为准稳态加速度、瞬态加速度和振动加速度。针对此问题调研总结了国际空间站的微重力研究情况,并以400 km轨道高度上100吨级"T"字型积木式空间站作为算例,估算其准稳态加速度大小及分布,并初步分析瞬态加速度水平的量级。结果表明,空间站准稳态加速度水平在1μgn量级,主要贡献来自重力梯度效应;瞬态加速度可达103μgn量级。文章对将来我国空间站微重力应用支持的设计工作有一定的借鉴意义。 相似文献
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激光测振技术的最新进展 总被引:1,自引:0,他引:1
激光测振技术在近20年取得了巨大进展。本文以2004年6月在意大利召开的第六届激光测振国际会议的技术内容为基础,重点介绍激光测振技术在计量学方面的进展和在其他领域的应用。 相似文献
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Peter J. Cargill Loukas Vlahos Rim Turkmani Klaus Galsgaard Heinz Isliker 《Space Science Reviews》2006,124(1-4):249-259
Particle acceleration in large-scale turbulent coronal magnetic fields is considered. Using test particle calculations, it
is shown that both cellular automata and three dimensional MHD models lead to the production of relativistic particles on
sub-second timescales with power law distribution functions. In distinction with the monolithic current sheet models for solar
flares, particles gain energy by multiple interactions with many current sheets. Difficulties that need to be addressed, such
as feedback between particle acceleration and MHD, are discussed. 相似文献
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L. Zelenyi M. Oka H. Malova M. Fujimoto D. Delcourt W. Baumjohann 《Space Science Reviews》2007,132(2-4):593-609
This paper is devoted to the problem of particle acceleration in the closest to the Sun Hermean magnetosphere. We discuss
few available observations of energetic particles in Mercury environment made by Mariner-10 in 1974–1975 during Mercury flyby’s
and by Helios in 1979 upstream of the Hermean bow shock. Typically ions are non-adiabatic in a very dynamic and compact Mercury
magnetosphere, so one may expect that particle acceleration will be very effective. However, it works perfectly for electrons,
but for ions the scale of magnetosphere is so small that it allows their acceleration only up to 100 keV. We present comparative
analysis of the efficiency of various acceleration mechanisms (inductive acceleration, acceleration by the centrifugal impulse
force, stochastic acceleration in a turbulent magnetic fields, wave–particle interactions and bow shock energization) in the
magnetospheres of the Earth and Mercury. Finally we discuss several points which need to be addressed in a future Hermean
missions. 相似文献
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Possibility of stochastic acceleration of charged particle by nonlinear waves is investigated. Spatially regular (SR) and
spatiotemporal chaotic (STC) wave solutions evolving from saddle steady wave are tested as the fields. In the non-steady SR
field the particle is finally trapped by the wave and averagely gains its group velocity, while in the STC field the particle
motion displays trapped-free phases with its averaged velocity larger or smaller than the group velocity depending on the
charge sign. A simplified model is established to investigate the acceleration mechanism. By analogy with motor protein, it
is found that the virtual pattern of saddle steady wave plays a role of asymmetric potential, which and the nonlinear varying
perturbation wave are the two sufficient ingredients for the acceleration in our case.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Anomalous cosmic rays are a heliospheric phenomenon in which interstellar neutral atoms stream into the heliosphere, are ionized by either solar radiation or the solar wind, and are subsequently accelerated to very high energies, greater than 1 GeV. Current thinking has the bulk of the acceleration to very-high energies taking place, by the mechanism of diffusive shock acceleration, at the termination shock of the solar wind. Detailed two-dimensional numerical simulations and models based on this picture show broad agreement with a number of the observed properties of anomalous cosmic rays. Recent improvements to this picture include the observation of multiply charged cosmic rays and the suggestion that some "preacceleration" of the initially ionized particles occurs in the inner heliosphere. 相似文献
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航空产品制造、使用、维护过程中,需要采用公路运输模拟试验台在实验室进行运输试验,以检验产品质量。运输试验严酷等级及试验结果主要由主峰频率、加速度总均方根值及加速度功率谱密度三个参数进行控制。本文介绍了通过监测系统显示的此三个试验参数示值误差测量结果的不确定度评估方法。 相似文献