【摘 要】
:
Tip clearances of multistage rotors and stators greatly affect aero-engines' aerodynamic efficiency, stability and safety. The inevitable machining and assembly
【机 构】
:
Key Laboratory of High Performance Manufacturing for Aero Engine,Ministry of Industry and Informatio
论文部分内容阅读
Tip clearances of multistage rotors and stators greatly affect aero-engines' aerodynamic efficiency, stability and safety. The inevitable machining and assembly errors, as well as the compli-cated error propagation mechanism, cause overproof or non-uniform tip clearances. However, it is generally accepted that tip clearances are difficult to predict, even under assembly state. In this paper, a tip clearance prediction model is proposed based on measured error data. Some 3D error propagation sub-models, regarding rotors, supports and casings, are built and combined. The com-plex error coupling relationship is uncovered using mathematical methods. Rotor and stator tip clearances are predicted and analyzed in different phase angles. The maximum, minimum and aver-age tip clearances can be calculated. The proposed model is implemented by a computer program, and a case study illustrates its performance and verifies its feasibility. The results can be referred by engineers in assembly quality judgement and decision-making.
其他文献
This paper proposes using a Nonlinear Energy Sink (NES) to suppress the nonlinear aeroelastic response of laminated composite panels in supersonic airflows. Rel
太极拳是我国民族传统体育武术项目中的一颗灿烂的明珠,几千年来其独特的运动方式,丰富的理论学说,优良的健身效果,动静相宜、顺其自然的精神修养,深受我国人民的喜爱.随着我
在猫儿们眼中,这个世界究竟是什么模样?一群小猫可以给你最直接的答案。用最独特的视角观察世界,用最直观的画面传达意境,它们就是猫咪摄影师。不要惊讶,你家的小猫很可能也
本文以数字体育为背景,结合高校形体课堂教学的特点,让数字信息技术成为延伸大学生肢体技能训练和感受能力的机器和工具,从而快速的帮助学生掌握所学形体知识资源,激发大学生学习
本研究拟对单板U型场地滑雪优秀运动员的专项心理特征及调控方法做深入的研究和分析。指出单板U型场地滑雪动作特点及竞赛规则动作特点和竞赛规则决定了心理素质对该项目的重
对不同钒含量的拉延模具用半固态含钒灰铸铁试样进行了耐磨损性能和热疲劳性能的测试与分析。结果表明:随钒含量从0增加至1.25%,试样的磨损体积先减小后基本不变,热疲劳试验
(CAI)影像反馈教学法是通过摄像机,对队员在训练课上的技术动作进行记录;再由教练员编辑、制作;通过与正确动作的对比,让队员在教练员的帮助下感知并掌握正确技术动作的过程.
本文通过回顾大学体育教育发展的历程,阐述当代普通高校体育教育的多元目标,总结教育改革给现代普通高校的体育课程设置带来的变化,以及为实现多元化体育教学目标,出现的百花
This study aims to provide the pilot with optimal control time histories for stabilization of a helicopter after releasing the slung load in aerial delivery mis
一温度应力循环试验为研究温度、应力循环及两者同步循环对合金断裂寿命的影响,我们对常用的一种镍基高温合金进行了试验。合金的化学成分如表1。
A temperature stress cy