某型飞机防喘系统机上检查设备的研制

叙述了根据防喘系统的工作原理自行研制某型飞机防喘系统机上检查设备的硬件系统结构和软件设计思想,并介绍该检查设备的功能、特点、检测原理及框图.通过该检查设备的应用,使我们进一步了解当前PLC的最新控制技术.该检查设备的最主要特点是便于扩展,通用性强,因此有较高的推广应用价值.     

腐蚀和疲劳对飞机结构的挑战及解决思路

本文侧重于在沿海及远海使用的环境特点,分析了使用过程中飞机结构腐蚀和疲劳损伤形成的原因和对飞机飞行安伞的危害,以及目前的预防和控制措施所存在的问题.提出了建立"飞机设计厂所-装备机关-应用研究单位-机务部队"四位一体的闭环控制体系,采取超常规的措施开展工作,形成应用性强、实效好、可操作的腐蚀防护方法,为今后全面提高飞机...     

基于物理模型和灰色关联分析的直升机传动系统损伤定量检测方法

结合物理模型与灰色理论,提出了一种直升机传动系统损伤定量检测方法.针对直升机主传动系统的2K-H行星轮系,建立了太阳轮缺齿损伤的物理基模型,通过仿真获得了不同损伤严重度的行星轮系振动信号.选择并计算仿真信号的特征向量,并以此作为损伤特征的标准模式,然后对待检信号特征向量与标准模式进行灰色关联度分析,根据关联度对损伤进行...     

阀门止动环防脱分析

从理论上分析了阀门止动环受力情况,研究了止动环脱落的原因,给出了几种可以防止止动环脱落的方法,提出了止动环内径的设计方法,并用有限元软件对阀门止动环的脱落和防脱措施进行了仿真模拟,结果验证了理论推导。通过以上分析,加深了对于止动环防脱的理解,对今后止动环及沟槽的设计提供了指导。     

武器发射对某型发动机工作的影响

论述了在武器发射时,某型发动机的工作稳定性;分析了对发动机工作的影响。     

Climate Variability on Venus and Titan

Venus and Titan are both slowly-rotating, approximately Earth-sized bodies with cloudy, dynamic atmospheres. Each has a complex climate system, even less well understood than the terrestrial equivalent, and the processes that appear to maintain the climate near the surface on both bodies have interesting similarities and differences with each other and with the Earth. By considering these factors and their possible evolution with the aid of elementary climate models, some interesting, albeit tentative, conclusions can be reached concerning the stability of climate on Earth-like planets, and the likely nature of past and future climate change.     

Cosmic Rays at High Heliolatitudes

The Ulysses spacecraft has been the first to orbit the Sun over its poles and to explore the heliosphere at these high heliolatitudes. It has now completed two fast latitude scans, one at solar minimum and one at solar maximum. Since its launch in October 1990, this mission has led to several surprising discoveries concerning energetic particles, cosmic rays, Jovian electrons, the solar wind, the heliospheric magnetic field and the global features of the heliosphere. This review addresses mainly the propagation and modulation of cosmic rays and other charged particles, from both an observational and theoretical point of view, with emphasis on what has been learned from exploring the inner heliosphere to high heliolatitudes. This is done for solar minimum and maximum conditions. The review is concluded with a summary of the main scientific discoveries and insights gained so far from the Ulysses mission.     

大型宾馆火灾的形成原因及对策

随着我国改革开放的不断深入和经济建设的迅猛发展，新建的大型宾馆大都融厅、堂、房、室、场于一体，其既讲究整体美观实用性，又讲究外观雄伟、内部装饰豪华，从而使得其内部结构复杂多变。这些装饰物的增多，不但增加了火灾荷载，同时也增加了火灾危险性。大型宾馆一旦发生火灾往往会造成较大的财产损失和人员伤亡。从大型宾馆的火灾形成原因人手，分析火灾原因，并提出了解决大型宾馆火灾的对策。     

建筑卷扬机摆线针轮行星减速器优化设计

本文采用复合形法对摆线行星机构以摆线轮和输出轴圆盘体积之和最小为目标函数进行优化设计，并给出某快速电动卷扬机优化设计实例。     

波音737CL飞机模拟式座舱压力控制系统部件预防性维修与控制

针对波音737CL飞机模拟式座舱压力控制系统部件老龄化问题,提出部件预防性维修措施．减少因部件内部元器件老化造成的重复性故障,供业内同行参考。