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bird strike 鳥撞擊〔飛機和一群鳥相撞,可能造成失事〕。

bird watching

The scielltific computational theories and methods on bird strike to the windshield of aircraft have been systematically studied and summed up in this thesis , such as fem comptltational principles and procedures to elastic dynamic problems under the conditions of small and non - linear finite deformation , 3d viscous elastic constitutive theory and incremelltal expression under the consideration of the rate effect of non - metallic materials like the aircraft windshield , and the numerical compatational principles and key constitutions for impact - contact dynamic subjects 2 、系統學習并歸納總結了鳥體撞擊風擋結構問題中的科學計算理論與計算方法。按照鳥撞問題數值計算方法逐步深入的思路,系統總結了小變形結構動力學有限元數值計算方法、有限變形的幾何非線性有限元數值計算方法、粘彈性體非線性形變的本構物理關系;對于實施復雜結構有限元動力學計算的載荷增量方法提出了對newmark差分的改進以及進行材料與幾何非線性數值計算的細致步驟。

In summary the major research work in this thesis can be drawn as follows : 1 . the techncal data and research information from woridwide aviation history about bird striking to airframe have been collected and reviewed more carefully the evolutions of bird striking load models and fem numerical compatation methods to bird strike also have been sununarized . this informational research makes great help to position further thesis work scientifically 2 本文研究工作可歸納總結為以下三個方面: 1 、較全面整理綜述了鳥體撞擊飛機結構在國內外航空史上的技術資料以及鳥撞問題理論與工程研究的歷史沿革,總結了撞擊載荷研究模型、有限元數值計算方法的發展歷程等,明確了本文研究工作的科學定位。

This research work on bird striking has a long history and already got plentiful achievemellts in theories and experiments , howevef , still a long way no doubt waits to go for sophisticated research work on it more detailed to apply to airframe engineering quantitatively in combination wth the technical reformation of the birdstrike experimelltal system in our laboratory , this thesis deeply studies and analyses the numerica1 computation and simulation methods to birdstrike dynamic response problem based on finite - elemefit - method ( fem ) numerical emulation and modem large - scale scientfic computation software 本文結合我公司鳥撞實驗體系技術改造項目,應用有限元數值計算仿真技術及現代大型科學計算工具,對鳥體撞擊飛機風擋結構的動力學響應問題進行了系統學習與研究探討,初步掌握了科學計算方法,獲得了計算仿真的實踐經驗,為今后深入應用大型科學計算手段進行撞擊類科學問題的研究以及深入應用于工程實踐奠定了強有力的工作基礎。

The accidents of bird impact have caused huge loss to human being . it is important to establish the predicting system to definite the response of the blade for the improvement the strength of the blade on the design of the resistance of the blade under the bird strike 減少此類事故發生的措施之一是:針對易受鳥撞擊的發動機等主要部件,從理論與實踐方面研究鳥撞擊的機理,對其進行結構、強度及性能的計算與試驗分析,指導工程設計,提高這些部件自身的抗鳥撞擊能力。

Branch of the ministry of transport , enac ( agency for civil aviation ) . studies , consults , makes proposals in the field of bird strike prevention . the organization has participated in several international meetings 意大利交通部分支機構, enac (民航機構) 。在防止鳥撞事件領域內進行研究、咨詢和提出建議,并參加若干國際會議。

The supplementary information to address the potential bird strike risk submitted by the permit holder on 10 april 2001 , 25 may 2001 and 8 june 2001 respectively 許可證持有人分別于2001年4月10日、 2001年5月25日及2001年6月8日所提交用以避免潛在鳥撞風險的補充資料。

The bird strike is similar to adding a high velocity rate loading to the aircraft wndshield , and thus results in the wndshield ' s high stain rate deformation 飛鳥對于風擋的撞擊,類似于對于風擋施加一高速率的載荷,從而引起風擋材料以很高的應變速率變形。

The canopy transparency was strengthened to withstand a four - pound , 350 - knot bird strike 透明座艙蓋被加強到可以經受一只四磅重的飛鳥以350節相對速度產生的撞擊。