31 2 飞机地面刹车运动
图 9～图 12为飞机在干燥跑道上着陆滑行时 ,在防滑刹车系统作用下 ,飞机各参数的响应历程 :可以看出 ,尽管由于升力减少 ,飞机机轮垂直载荷增大 ,所需的刹车力矩增大 ,但在防滑控制系统调节下 ,主起轮胎滑移率始终保持在最佳滑移率附近 ,使飞机具有较高刹车效率 ;由于地面作用力的变化 ,弹性起落架在着陆和刹车的初始时刻走步现象较严重 ,使得轮胎滑移率也产生激烈振荡 ,进入稳定滑跑后 ,走步现象很微弱。
图 12 主起落架走步现象
Fig112 Velocity of main landing gear strut vibrating
4 结 论
(1)建立了飞机地面运动的六自由度模型 ,
(3)由于地面作用力的变化 ,弹性起落架在着陆和刹车的初始时刻存在较严重的走步现象。
(4)
采用滑移率控制的方法能使飞机在刹车过程中始终保持最佳刹车性能 ,提高刹车效率。
通过本文的工作 ,为大型飞机地面操纵动力学研究和飞机疲劳载荷谱的编制奠定了基础。
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作者简介 :张明 (1981 -) 男 ,博士研究生。主要研究方向 :飞机起落装置设计、 CAD/ CA E辅助设计等。 Tel :025284892384 E2mail :zhm6196 @126. com
聂宏 (1960 -) 男 ,教授 ,博士生导师。主要研究方向 :飞机起落架装置设计、结构疲劳与断裂、飞机起落架自适应控制技术等。
Tel :025284892411 E2mail :hnie @nuaa. edu. cn (责任编辑 :李铁柏 )
文章编号 :100026893 (2008) 0320757206
飞机制造大型工装布局设计方法研究与实现
潘志毅 ,黄翔 ,李迎光 (南京航空航天大学机电学院 ,江苏南京 210016)
Research and Implementation of Method of Layout Design for Large Tooling in
Aircraft Manufacture
Pan Zhiyi , Huang Xiang , Li Yingguang
(College of Mechanical and Electrical Engineering , Nanjing University of Aeronautics and
Astronautics , Nanjing 210016 , China)
摘 要
:飞机制造大型工装是保证飞机产品协调互换和几何参数的重要工艺装备
,其研制工作量大 ,周期要求越来越短。目前 ,中国航空制造企业大型工装设计和制造并行的需求十分迫切 ,且亟需计算机辅助概念设
元件级和工装级
设计工具 ,在某型号飞机后机身装配型架设计中应用验证 ,大大减少了设计迭代和返修率。关键词 :布局设计 ;工艺装备 ; CAD ;概念设计 ;骨架 ;装配型架中图分类号 : TH122;TP391 文献标识码 :A Abstract : Large tooling in aircraft manufacture is a mechanical product used to ensure the complex aircraft structure’s figure and coordination. The workload of its design and manufacture is huge , and the developing cycle desired becomes shorter and shorter. It is needed urgently to fulfill concurrent design and manufacture for large tooling , and develop computer2aided conceptual design software to support large tooling design as well. In the light of the research on layout design and the large tooling model quoting logical component , a layout de2 sign algorithm based on classification and evolution computation according to layout restriction is brought for2 ward. In this algorithm , rational situation of frame element is worked out by evolution computation of anchor2 point level , frame element level and tooling level in turn. Computer2aided conceptual design software related is developed and applied to latter2airframe assembly tooling design. It proves less design iteration and lower per2 centage of tooling sent back. Key words : layout design ; tooling ; CAD ; conceptual design ; frame ; assembly tooling 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：航空学报08大飞机专刊(54)
