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大型客机起落架缓冲系统优化设计技术研究.doc
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大型客机起落架缓冲系统优化设计技术研究.doc
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摘 要
以支柱式起落架为背景,在传统二质量模型的基础上,考虑油液不可压和可压两种情况,
分别推导了空气弹簧力的计算公式。并给出了一种由飞机运动学参数、轮胎几何参数和跑道物
理参数等共同确定摩擦系数的经验公式,用于计算地面水平反力。
以某型飞机主起落架为例, 实现了其基于 ADAMS/Aircraft 的落震虚拟样机,并进行了落震
仿真。通过与试验数据的对比发现,该起落架虚拟样机的落震仿真能够很好的模拟起落架的着
陆缓冲性能。
提出了变油孔缓冲器油针几何形状的优化模型。以某型飞机主起落架的落震虚拟样机为例,
以油针几何形状为设计变量,基于 iSIGHT 集成 ADAMS/Aircraft 建立了飞机起落架缓冲系统多
目标优化流程。使用功落震工况下,优化后的缓冲器轴向力减小了 7%左右,而缓冲器效率可
同时提高 6%以上。
以起落架缓冲系统传统的设计方法为基础,结合上述的优化流程建立了飞机起落架缓冲系
统设计、仿真和优化一体化流程,并对某大型客机的前起落架和主起落架进行了设计优化。与
传统方法设计相比较,经过变油孔优化设计后,前起落架使用功落震的缓冲器效率提高了 19.6%,
支柱轴向力降低了 15.9%,主起落架使用功落震的缓冲器效率提高了 8.7%,支柱轴向力降低了
7.2%。前起落架和主起落架的缓冲性能均得到了明显的提高。
关 键 词:起落架,ADAMS,虚拟样机,油针,iSIGHT,多目标优化
![](https://csdnimg.cn/release/download_crawler_static/88310391/bg2.jpg)
大型客机起落架缓冲系统优化设计技术研究
II
ABSTRACT
Under the background of aircraft post landing gears, air-spring force formula has been derived
based on traditional two-mass model, by considering oil incompressible and compressible.
Furthermore, an empirical formula about friction coefficient which is determined by the parameters of
aircraft motion, tire geometry and runway has been established to obtain ground horizontal reaction
force.
Taking Y8 main landing gear as an example, drop virtual prototyping based on ADAMS/Aircraft
has been achieved, and drop simulation has been conducted. There is a good corespondence between
the simulation result and the experimental data.
The optimization model of variable-orifice is expressed. That is, the metering pin area of section
is the design variable. Combined with Adams/Aircraft, the multi-objective optimization of landing
gear shock-absorbing system is established in iSIGHT. Under use work drop case, shock strut axial
force decreases about 7%, and shock strut effectiveness can increase 6% more at the same time after
optimization.
Based on conventional design methods, the design optimization of nose and main landing gears
of large civil aircraft capability is preceded integrated by the procedure above. As a result, the shock
strut efficiency of nose landing gear is improved 19.6%. However, the strut axis force is reduced
15.9%. In corresponds, the shock strut efficiency of main landing gear is enhanced 8.7%.However,
the strut axis force is lessened 7.2%. The shock-absorbing characteristics of nose and main landing
gears are significantly evaluated.
Keywords : landing gear, ADAMS, virtual prototyping, metering pin, iSIGHT, multi-objective
optimization
![](https://csdnimg.cn/release/download_crawler_static/88310391/bg3.jpg)
目 录
第一章 绪论 ...........................................................................................................................................1
1.1 工程背景与意义 ...........................................................................................................................1
1.2 国内外研究现状...........................................................................................................................2
1.3 研究目的与研究内容...................................................................................................................4
第二章 起落架着陆动态性能分析模型 ...............................................................................................5
2.1 缓冲支柱受力分析.......................................................................................................................6
2.1.1 油液阻尼力 ...........................................................................................................................8
2.1.2 空气弹簧力 ...........................................................................................................................8
2.1.3 内部摩擦力 ...........................................................................................................................8
2.2 轮胎受力分析...............................................................................................................................8
2.3 运动微分方程...............................................................................................................................8
2.4 本章小结.......................................................................................................................................8
第三章 基于 ADAMS/AIRCRAFT 起落架落震动力学仿真 ..............................................................8
3.1 起落架落震试验...........................................................................................................................8
3.2 建立模板.......................................................................................................................................8
3.2.1 轮胎模板的建立 ...................................................................................................................8
3.2.2 起落架模板的建立 ...............................................................................................................8
3.3 落震仿真与结果验证...................................................................................................................8
3.4 本章小结.......................................................................................................................................8
第四章 基于 ISIGHT 的起落架缓冲性能优化设计技术 ....................................................................8
4.1 ISIGHT 简介..................................................................................................................................8
4.1.1 ISIGHT 的几大优势 ..............................................................................................................8
4.1.2 ISIGHT 的工作过程 ..............................................................................................................8
4.2 优化模型的建立...........................................................................................................................8
4.2.1 设计变量 ...............................................................................................................................8
4.2.2 目标函数 ...............................................................................................................................8
4.2.3 约束条件 ...............................................................................................................................8
4.2.4 优化模型 ...............................................................................................................................8
4.3 基于 ISIGHT 的优化流程的建立................................................................................................8
![](https://csdnimg.cn/release/download_crawler_static/88310391/bg4.jpg)
大型客机起落架缓冲系统优化设计技术研究
IV
4.3.1 软件的集成 ...........................................................................................................................8
4.3.2 模块的建立 ...........................................................................................................................8
4.3.3 参数映射 ...............................................................................................................................8
4.4 优化设计.......................................................................................................................................8
4.4.1 对油针分段位置进行优化 ...................................................................................................8
4.4.2 对油针横截面积进行优化 ...................................................................................................8
4.4.3 对油针分段位置和横截面积进行优化 ...............................................................................8
4.5 小结...............................................................................................................................................8
第五章 大型客机起落架缓冲系统设计及缓冲性能优化 ...................................................................8
5.1 缓冲系统设计计算.......................................................................................................................8
5.1.1 轮胎的选择 ...........................................................................................................................8
5.1.2 缓冲器参数确定 ...................................................................................................................8
5.2 设计、仿真、优化一体化流程...................................................................................................8
5.3 初始设计落震仿真.......................................................................................................................8
5.3.1 前起落架落震仿真 ...............................................................................................................8
5.3.2 主起落架落震仿真 ...............................................................................................................8
5.4 优化设计.......................................................................................................................................8
5.4.1 前起落架优化设计 ...............................................................................................................8
5.4.2 主起落架优化设计 ...............................................................................................................8
5.5 小结...............................................................................................................................................8
第六章 总结与展望 ...............................................................................................................................8
6.1 总结...............................................................................................................................................8
6.2 进一步工作展望...........................................................................................................................8
参考文献 .................................................................................................................................................8
致 谢 .......................................................................................................................................................8
在学期间的研究成果及发表的论文 .....................................................................................................8
![](https://csdnimg.cn/release/download_crawler_static/88310391/bg5.jpg)
图表清单
图 2. 1 起落架结构模型和力学模型 .....................................................................................................5
图 2. 2 起落架各部分受力示意图 .........................................................................................................6
图 2. 3 缓冲器内部压力作用示意图 .....................................................................................................7
图 3. 1 数字化虚拟飞机组件原理示意图 .............................................................................................8
图 3. 2 数字化虚拟起落架的建造流程 .................................................................................................8
图 3. 3 某型飞机主起落架结构示意图 .................................................................................................8
图 3. 4 起落架虚拟样机主要部件示意图 .............................................................................................8
图 3. 5 某型飞机主起落架数字化虚拟样机 .........................................................................................8
图 3. 6 某型飞机主起落架数字化虚拟样机落震过程 .........................................................................8
图 3. 7 某型飞机主起落架使用功落震功量图 .....................................................................................8
图 3. 8 某型飞机主起落架最大功落震功量图 .....................................................................................8
图 4. 1 油针轮廓图 .................................................................................................................................8
图 4. 2 优化流程图 .................................................................................................................................8
图 4. 3 ISIGHT 集成 ADAMS 过程中相关文件从属关系 ...................................................................8
图 4. 4 参数映射示意图 .........................................................................................................................8
图 4. 5 优化油针分段位置后某型飞机主起落架落震功量图 .............................................................8
图 4. 6 优化油针截面面积后某型飞机主起落架落震功量图 .............................................................8
图 4. 7 优化油针分段位置和截面面积后某型飞机主起落架落震功量图 .........................................8
图 5. 1 额定压力下主起落架轮胎的压缩曲线 .....................................................................................8
图 5. 2 额定压力下前起落架轮胎的压缩曲线 .....................................................................................8
图 5. 3 起落架缓冲器初步设计 EXCEL 表格 ........................................................................................8
图 5. 4 起落架缓冲器设计、仿真、优化一体化流程 .........................................................................8
图 5. 5 优化后输出的结果文件内容 .....................................................................................................8
图 5. 6 大型客机前起落架落震功量图 .................................................................................................8
图 5. 7 大型客机主起落架落震功量图 .................................................................................................8
图 5. 8 优化后大型客机前起落架落震功量图 .....................................................................................8
图 5. 9 优化后大型客机主起落架落震功量图 .....................................................................................8
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