西安航空职业技术学院 毕业设计论文

1 飞机起落架故障分析

【摘要】

起落架是飞机的重要组成部分，飞机的停放、起飞着陆主要是由起落架来完成的。所以起落架的工作性能直接影响了飞机的安全性和机动性。

飞机起落架故障很多，本文主要针对歼七和歼八飞机的一些故障加以分析。主要阐述了歼八飞机主起落架机轮半轴裂纹故障分析和歼七飞机起落架收放系统典型故障分析。

关键词： 起落架 机轮半轴 裂纹 法兰盘 自动收起 油路堵死 电液换向阀

Abstract:

Landing gear is an important part of the plane, the plane's parking,

off and landing is mainly composed of landing gear to finish. So the

landing gear on the working performance directly affect the safety of the

aircraft and mobility.

Landing gear fault many, this article mainly aims at annihilates seven

and fighters eight aircraft some fault analysis. Mainly expounds the main

annihilates eight plane aeroplane undercarriage tyre half axle crack

fault analysis and fighters seven aircraft gear fault analysis of typical

positioning systems. And explained how to judge whether these faults and

some trouble-shooting reason method.

Key words：Landing gear Tire half shaft Crack Flanges

Automatic pack up Oil-wayquartz Electro-hydraulic reversing valves

西安航空职业技术学院 毕业设计论文

2 目 录

1.歼8飞机主起落架机轮半轴裂纹故障分析 ...................................................................................... 3

1.1引论 ................................................................................................................................................ 3

1.1.1主起落架结构设计概况 ....................................................................................................... 3

1.1.2 主起落架机轮半轴故障概况 .............................................................................................. 4

1.2主起落架机轮半轴失效分析 ........................................................................................................ 4

1.2.1主起落架机轮半轴受力分析 ............................................................................................... 5

1.2.2 机轮半轴裂纹检测及断口分析 .......................................................................................... 6

1.3 主起落架机轮半轴疲劳试验结果 ................................................................................................ 7

1.3.1 机轮半轴疲劳试验破坏部位 .............................................................................................. 8

1.3.2 试验结果与使用情况差异分析 .......................................................................................... 8

1.3.3外场飞机使用特点分析 ....................................................................................................... 9

1.3.4 主起落架机轮半轴失效分析结论 ...................................................................................... 9

1.4主起落架机轮半轴结构设计改进 ................................................................................................ 9

1.4.1半轴结构设计改进原则 ....................................................................................................... 9

1.4.2半轴结构细节设计改进 ....................................................................................................... 9

1.5 经验教训 ..................................................................................................................................... 10

1.5.1 设计载荷谱、变形预测与实际使用情况相符 ................................................................ 10

1.5.2完善细节抗疲劳设计和强化工艺是提高结构抗疲劳开裂的重要技术途径 .................. 10

1.5.3地面疲劳试验验证刚度模拟要真实 ................................................................................. 10

1.5.4制定合理的检修周期是确保使用安全的重要措施 ......................................................... 10

2歼七飞机起落架收放系统典型故障分析 ......................................................................................... 11

2.1歼七飞机前起落架自动收起的故障研究 .................................................................................. 11

2.1.1起落架收放控制原理分析 ................................................................................................. 11

2.1.2起落架自动收起原因分析 ................................................................................................. 12

2.2.1 电液换向阀性能不良 ...................................................................................................... 12

2.3 故障验证 .................................................................................................................................... 14

2.4维修对策 ...................................................................................................................................... 14

2.4.1改进起落架收放管路的设计 ............................................................................................. 14

2.4.2提高产品质量，加强安装前的检查 ................................................................................. 15

结束语 .................................................................................................................................................... 16

谢 辞 ...................................................................................................................................................... 17

参考文献 ................................................................................................................................................ 19