31 2 飛機地面剎車運動
圖 9～圖 12為飛機在干燥跑道上著陸滑行時 ,在防滑剎車系統作用下 ,飛機各參數的響應歷程 :可以看出 ,盡管由于升力減少 ,飛機機輪垂直載荷增大 ,所需的剎車力矩增大 ,但在防滑控制系統調節下 ,主起輪胎滑移率始終保持在最佳滑移率附近 ,使飛機具有較高剎車效率 ;由于地面作用力的變化 ,彈性起落架在著陸和剎車的初始時刻走步現象較嚴重 ,使得輪胎滑移率也產生激烈振蕩 ,進入穩定滑跑后 ,走步現象很微弱。
圖 12 主起落架走步現象
Fig112 Velocity of main landing gear strut vibrating
4 結 論
(1)建立了飛機地面運動的六自由度模型 ,
(3)由于地面作用力的變化 ,彈性起落架在著陸和剎車的初始時刻存在較嚴重的走步現象。
(4)
采用滑移率控制的方法能使飛機在剎車過程中始終保持最佳剎車性能 ,提高剎車效率。
通過本文的工作 ,為大型飛機地面操縱動力學研究和飛機疲勞載荷譜的編制奠定了基礎。
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作者簡介 :張明 (1981 -) 男 ,博士研究生。主要研究方向 :飛機起落裝置設計、 CAD/ CA E輔助設計等。 Tel :025284892384 E2mail :zhm6196 @126. com
聶宏 (1960 -) 男 ,教授 ,博士生導師。主要研究方向 :飛機起落架裝置設計、結構疲勞與斷裂、飛機起落架自適應控制技術等。
Tel :025284892411 E2mail :hnie @nuaa. edu. cn (責任編輯 :李鐵柏 )
文章編號 :100026893 (2008) 0320757206
飛機制造大型工裝布局設計方法研究與實現
潘志毅 ,黃翔 ,李迎光 (南京航空航天大學機電學院 ,江蘇南京 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
:飛機制造大型工裝是保證飛機產品協調互換和幾何參數的重要工藝裝備
,其研制工作量大 ,周期要求越來越短。目前 ,中國航空制造企業大型工裝設計和制造并行的需求十分迫切 ,且亟需計算機輔助概念設
元件級和工裝級
設計工具 ,在某型號飛機后機身裝配型架設計中應用驗證 ,大大減少了設計迭代和返修率。關鍵詞 :布局設計 ;工藝裝備 ; CAD ;概念設計 ;骨架 ;裝配型架中圖分類號 : TH122;TP391 文獻標識碼 :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 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：航空學報08大飛機專刊(54)
