激光跟踪仪在某型飞机制造中的应用研究

阐述了激光跟踪仪组成、测量原理及误差补偿方法。利用激光跟踪仪分别在某型飞机后机身总装、大部件对接和质量检测工位构建了空间测量系统。实现了部件装配平台运动闭环控制,完成了飞机大部件预总装动态调姿引导,对飞机部件装配质量进行了定量监控,大幅度提高了飞机装配效率和质量。     

飞机大部件数字化自动对接装配技术研究

传统飞机大部件对接装配多采用刚性工装对接,该技术精度低、可靠性差、误差补偿难。针对这一问题,介绍飞机大部件数字化对接系统的功能和组成,分析数字化对接系统的四个关键技术。从测量场的构建、对接系统初始位置的标定、对接路径的规划、测量误差的补偿四个方面对某型飞机外翼与中央翼的对接进行研究,实现对接系统的调姿和误差测量与控制,完成外翼与中央翼的精确对接。应用结果表明：采用数字化自动对接装配技术,可有效降低对接误差,提高对接装配的精度和效率。     

读来读往

<正>近几年,我国航空企业飞机部件自动化装配技术已有了巨大飞跃。我国飞机自动化装配技术的应用面已经从组件装配拓宽到复杂的部件装配以及大部件对接过程中,并对飞机自动化总装配中部分关键技术进行了攻关。本期针对飞机装配技术应用与发展集中报道,为相关工程技术人员提供一个技术交     

大部件对接后交点孔精加工方法研究

飞机上大部件对接大多采用叉耳式交点对接,装配中常采用在交点孔内径上留有工艺余量,对接时通过扩、铰孔的精加工方法来消除装配误差,保证飞机的装配要求。某型飞机大部件对接交点沿上下两条轴线分布着多组交点孔,耳片不连续,形成不连续的深孔,这种对接方式在国内飞机装配中首次采用。通过对部件结构进行研究,设计了合理的精加工方法和加工刀具,并通过生产验证,达到了理想的效果。     

飞机大部件数字化对接关键问题及应用分析

飞机制造过程的重要环节是飞机装配.大部件数字化对接是基于数字量的装配协调方法,借助由数控定位器、激光测量系统和集成控制系统组成的数字化对接系统,按照设计技术要求,将大部件支撑、调姿、定位并连接成更高一级装配件或整机的过程.图1显示了大部件数字化对接的数字量协调原理.     

C919前机身部件数字化自动定位技术应用研究

飞机部件对接采用传统专用刚性型架,其成本高,精度和效率低。大型客机机身部件尺寸大、精度要求高,采用数字化自动定位技术能够完成飞机部件的精确定位,可大幅提高飞机部件装配质量和效率,减少制造成本。介绍了数字化自动定位技术的实施过程,并详细阐述了C919前机身部件数字化自动定位技术应用过程,对国内飞机大部件数字化自动对接装配具有重要参考和借鉴意义。     

飞机大部件对接测量方案的研究与应用

自从飞机开展数字化设计后,大大提高了飞机装配精度和质量,同时对装配过程的测量也提出了新的要求,因此,只有通过高效的测量手段和方案才能满足飞机装配精度。以大型灭火/水上救援水陆两栖飞机——AG600的三大部件对接为研究对象,基于测量体系的建立和激光跟踪仪测量转站技术,研究飞机大部件调姿的测量技术。该飞机大部件调姿的测量是利用激光跟踪仪对部件上的多个基准点进行测量,通过柔性装配工装实现飞机的姿态调整,进而达到飞机安装要求的测量调姿过程,对于传统测量方法,采用激光跟踪仪进行转站测量的方法,不失为最简单有效的大飞机部件对接测量方法。     

飞机部件数字化装配技术发展综述

随着我国大飞机研制的立项,数字化装配敏捷、高效、高质量的技术优势已经被国内飞机制造企业所认识。当前,借助于大飞机本身的装配技术要求,数字化装配的应用将首先在飞机对接装配领域取得突破。在飞机部件装配过程中,各部件外廓尺寸和重量都比较大,移动调整比较困难,在整个装配过程中占用较长的周期。而且部件装配质量直接     

民用飞机大部件数字化对接关键技术

飞机大部件对接装配的数字化和自动化可以有效降低部件对接误差,提高飞机大部件对接装配精度和效率,是飞机大部件装配的发展趋势.今后其发展重点是需要开展面向飞机装配的设计技术的研究,主要在设计对接形式时要充分考虑自动对接装配的要求,特别是测量点的布置;其次是要实现大部件自动对接系统的装备化、标准化、模块化和系列化设计,以便推广应用.     

飞机大部件自动对接集成控制技术研究

自动化对接集成控制技术集测量技术、协同运动控制技术、装配信息集成管理技术、运动仿真技术为一体,是大部件自动对接的关键技术。对飞机大部件自动对接集成控制的关键技术进行探讨,并介绍机翼大部件数字化对接系统的组成结构、功能、处理流程等。     

有翼高超声速再入飞行器气动设计难点问题

有翼高超声速再入飞行器是近年来的研究热点,气动设计是飞行器设计的关键。为了更清楚地认识有翼高超声速再入飞行器气动设计的难点问题,对有翼高超声速再入飞行器的发展、优势及总体任务剖面进行了介绍,从5个方面详细介绍了该类飞行器气动设计的难点问题,包括多约束复杂面对称气动布局设计、高温真实气体效应对气动特性影响、天地差异与天地换算方法、反作用控制系统(RCS)喷流干扰对气动特性的影响以及气动数据不确定度等,简要阐明了这些难点问题对总体设计的重要性以及初步的解决思路,为有翼高超声速再入飞行器气动设计提供了一些参考。     

Simulation and Analysis of Crashworthiness of Fuel Tank for Helicopters

Crashworthiness requirement of fuel tanks is one of the important requirements in helicopter designs. The relations among the protection frame, textile layer and rubber layer of the fuel tank are introduced. Two appropriate FE models are established, one is for an uncovered helicopter fuel tank without protection frame, and the other is for fuel tank with protection frame. The dynamic responses of the two types of fuel tanks impinging on the ground with velocities of 17.3 m/s are numerically simulated for the purpose of analyzing energy-absorbing capabilities of the textile layer and protection frame. The feasibility of the current crashworthiness design of the fuel tank is examined though comparing the dynamic response behaviors of the two fuel tanks.     

The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig.Measurements of heat transfer from the discs and tangential velocities are presented.The test rig is a 70% full scale version of a high pressure compressor stack of an axial gas turbine engine.Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air.Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows(Re up to 5×106 and Rez up to 2×105).Two different builds have been tested.The most significant difference between these two build configurations is the size of the annular gap between the(non-rotating) drive shaft and the bores of the discs.The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method.The velocity measurements were made using a two component,LDA system.The heat transfer results from the discs show differences between the two builds.This is attributed to the wider annular gap allowing more of the throughflow to penetrate into the cavity.There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig.For the narrow annular gap,there is an increase of non-dimensional tangential velocity V/Ωr with radial location to solid body rotation V/Ωr=1.For the wider annular gap,the non-dimensional velocities show a decrease with radial location to solid body rotation.      

突破技术趋同，波音再现竞争优势

 波音公司面临着来自空客公司的巨大挑战,企业战略性创新才是公司成功的关键。为此波音公司的全部战略性研究集中在扩大产品的差异性上,体现在3个方面：电子化（e-Enabled）运营环境、整体复合材料机身部件的制造技术和支持波音787客机的全球协同环境（GCE）。     

临近空间飞行器测控与信息传输系统频段选择

 临近空间飞行器是高性能信息化武器平台,测控（TT&;C）与信息传输系统是其信息保障的核心,而选择合理、可行的频段是展开系统设计的前提和基础。频段选择影响到整个技术方案的制定,是一个需综合考虑、影响深远并具有战略意义的关键问题,从国际电联（ITU）国际标准、高速数传、接收信噪比（SNR）、“三抗”、超视距中继、黑障、雨衰以及设备研制成熟度8个方面全面、细致论证了近空间平台测控系统的频段选择问题,最终得出在视距链路中以Ka频段为宜,在超视距链路中以Ku/Ka双频段为宜的结论。     

基于弯曲激波压缩系统的高超声速进气道反设计研究进展

总结了近十年来弯曲激波压缩研究的主要成果。提出了弯曲激波压缩系统的新概念,即利用特殊设计的楔形弯曲压缩面或空间弯曲压缩面,产生一系列与前缘弱激波相互交汇或叠加的压缩波系,从而使前缘激波弯曲,形成特殊的弯曲激波,它与波后的等熵压缩波来共同完成对气流的压缩。在此基础上,实现了由给定出口气动参数的超声速内流道反设计,实现了由给定压缩面压力分布和给定压缩面马赫数分布要求的型面反设计,实现了由给定激波波面的压缩型面反设计。研究证明,弯曲压缩面-弯曲激波压缩系统具有良好的综合气动性能,为高性能高超声速进气系统的气动设计提供了一种全新的设计方法。     

Experimental Study on Effects of Fuel Injection on Scramjet Combustor Performance

In order to investigate the effects of fuel injection distribution on the scramjet combustor performance, there are conducted three sets of test on a hydrocarbon fueled direct-connect scramjet test facility. The results of Test A, whose fuel injection is carried out with injectors located on the top-wall and the bottom-wall, show that the fuel injection with an appropriate close-front and centralized distribution would be of much help to optimize combustor performances. The results of Test B, whose fuel injection is performed at the optimal injection locations found in Test A, with a given equivalence ratio and different injection proportions for each injector, show that this injection mode is of little benefit to improve combustor performances. The results of Test C with a circumferential fuel injection distribution displaies the possibility of ameliorating combustor performance. By analyzing the effects of injection location parameters on combustor performances on the base of the data of Test C, it is clear that the injector location has strong coupled influences on combus- tor performances. In addition, an inner-force synthesis specific impulse is used to reduce the errors caused by the disturbance of fuel supply and working state of air heater while assessing combustor performances.     

(高)超声速流动试验技术及研究进展

近年来,与高速飞行器相关的(高)超声速流动受到了极大的关注。这类流动所具有的非定常性、强梯度和可压缩性对试验方法和风洞设计技术提出了挑战。超声速纳米示踪平面激光散射(NPLS)技术是由作者所在团队研发的非接触光学测试技术。它能够以较高的空间分辨率来揭示超声速三维流场的一个瞬态剖面的时间解析的流动结构。介绍了NPLS技术以及基于NPLS开发的密度场测量、雷诺应力测量和气动光学波前测量等方法,并回顾了这些技术在超声速边界层、超声速混合层、超声速压缩拐角、激波/边界层相互作用和光学头罩绕流等流动中的应用,清晰地再现了边界层、混合层、激波等典型流场结构及其时空演化特性。另外,为了模拟和研究高空大气条件下边界层自然转捩和超声速混合层的转捩特性,介绍了高超声速静风洞、超-超混合层风洞的设计技术以及层流化喷管的设计方法。     

Research on Auto-detection for Remainder Particles of Aerospace Relay Based on Wavelet Analysis

Aerospace relay is one kind of electronic components which is used widely in national defense system and aerospace system. The existence of remainder particles induces the reliability declining, which has become a severe problem in the development of aerospace relay. Traditional particle impact noise detection (PIND) method for remainder detection is ineffective for small particles, due to its low precision and involvement of subjective factors. An auto-detection method for PIND output signals is proposed in this paper, which is based on direct wavelet de-noising (DWD), cross-correlation analysis (CCA) and homo-filtering (HF), the method enhances the affectiv-ity of PIND test about the small particles. In the end, some practical PIND output signals are analysed, and the validity of this new method is proved.