bird impact 中文意思是什麼
bird impact
解釋
撞鳥-
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。 -
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 、系統學習並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。 -
The information generated in current study suggests that the developing influenza ecosystem in southern china region may play an important role in the process of emerging novel influenza viruses, even directly impact the genesis of pandemic influenza strains. materials and methods : fecal, cloacal and tracheal swabs from different types of poultry were collected in live - bird retail markets once a week. they were inoculated into 9 - 11 days embryonated chicken eggs and incubated in 35 for 72 hours
本課題意在: 1 、以pa和cu為代表，探討hgnz亞型流感病毒在這些新形成的小種群中的流行情況; 2 、探討這些小種群中流感病毒的來源:是從其它動物跨種屬傳遞而來，還是本身為流感病毒的天然宿主: 3 、探討這些新形成種群中hgnz亞型流感病毒的進化情況，以及其在整個流感病毒生態體系中的作用;材料和方法:每周採集標本一次，常規處理后，接種於9一n日齡雞胚尿囊腔， 35恆溫培養72小時，收取雞胚尿囊液。 -
The dynamic data of displacement, strain and impetus force acquired from the experimental collection system are also well analyzed for measuring precision and errors. based on the underlying work and experimental features, the thesis proposes a simple, practical and well accurate impetus resultant force fitting method, weighted factor fitting method. a line - off data processing software system for bird - impact experiment, named as cadabie, is well designed under the principle of software engineering, and has been applied, with high praise, in bird - impact laboratory in the factory numbered 320 and esfahan bird - impact laboratory of iran
本文系統總結了鳥撞實驗的全部過程、主要儀器設備的工作原理與性能參數，分析了鳥撞實驗動態數據採集系統中位移、應變與撞擊壓力傳感器測量系統的測量范圍、測量精度及其工作特點，提出了一種更適合鳥撞實驗的撞擊合力計算擬合方法：加權因子法，同時應用軟體工程原理編制了「鳥撞實驗計算西北工業大學博士論文機數據分析系統」 （ caoabie ） ，目前該軟體己經在320廠鳥撞實驗室以及 -
Investigation into arc windshield of aircraft subjected to bird impact
飛機圓弧風擋的抗鳥撞擊問題研究 -
Test method for bird impact testing of aerospace transparent enclosures
航空航天透明外殼撞鳥試驗的試驗方法 -
With the development of the aircraft performance at low altitude and high speed, as well as the marked progress of eco - environmental protection, the issue of bird impact to aircraft has been concerned more and more
隨著航空器低空高速性能的發展，以及生態環境保護工程卓有成效的工作，飛行器結構鳥撞問題越來越引起人們的注意。 -
The first stage compressor or fan blades of aircraft engine may be damaged due to bird impact
鳥與飛機相撞造成的事故給人類帶來了巨大的損失。 -
When an aircraft flies at a high speed in the low altitude, bird impact possibly occurs
飛機在低空、高速飛行時，可能會遇到飛鳥的撞擊。 -
The response of blade due to two kinds material bird model impact are analyzed
分析了兩種鳥體材料在不同接觸方式下對葉片響應的影響。 -
It is observed from the result of test that the bird bodies basically show liquid characteristics in the process of impact and that the relative pa rts of the plane affect the dynamic response ' of windshield glass
從高速攝像和攝像結果中發現，鳥體在撞擊過程中基本表現出流體特性，飛機的附件對鳥撞試驗有較大的影響。 -
This paper firstly presents the impact basic theories and the applying method for the general engineering fem software system - ansys, then the preliminary numerical simulation has been conducted in the mechanical process of the laminated composite plates subjecting to the impacting loads, the higher - velocity hit between the composite shells and the metal structures, the bird - impact radar cover experiment is also included. changes of the mechanical values in subjecting to different impact loads are also analyzed
而後通過對復合材料結構層合板遭受沖擊載荷作用、球殼與金屬板的高速撞擊，以及雷達罩鳥撞實驗等力學過程進行了初步數值模擬，分析了主要的力學參數量在承受不同沖擊變量時的變化，並為部分理論計算找出了相應的實驗依據。 -
In the positive - issue research of bird impact, the thesis carefully explores the basic theories, finite element numerical method and key techniques of the solution process in ls - dyna3d software system for contact - impact issue of viscoelastic bodies at large deformation. the well - chosen cases examine the accuracy of solutions in ls - dyna3d for large deformation impact issues. under the proof work, the incremental constitutive equation of bilinear and nonlinear viscoelastic materials are derived, coded and verified in ls - dyna3d
在鳥撞正問題的研究中，本文詳細推導了大變形粘彈性接觸-碰撞有限元分析的基本理論、數值計算方法、求解過程、關鍵技術以及上述內容在ls - dyna3d中的具體應用，算例考察了ls - dyna3d在求解碰撞以及大變形問題上的計算精度，同時推導了線彈性材料、雙線性彈塑性材料以及非線性粘彈性材料增量法迭代方程，編制了相應的用戶自定義材料子程序，並進行了子程序驗證。 -
But the existing data of bird impact are highly disperse, so that they do less help for the design of windshield and also cost more to experimental work
現有的鳥撞實驗數據分散嚴重，因而對風擋設計的指導作用較低，同時也無形中增加了實驗的次數。 -
According to all the research of this thesis, an improved and promising project of bird impact experiment combined with the wddf neural network can be suggested, which will be high efficiency
根據已有的研究成果，本文提出了鳥撞實驗的改進方案，可以在滿足實驗測量要求的基礎上簡化實驗過程，提高實驗效率。 -
Also the network shows many advantages of high training efficiency, robustness and anti - jamming energy, as well as the extensive applicability to the academic study and practical requirement of bird impact issue
網路訓練過程平穩、訓練效率高，同時具有較高的抗干擾能力，完全可以滿足鳥撞問題工程與理論研究要求。 -
In this thesis, a combined method of finite element numerical simulation with neural network is studied to obtain the dynamic response, the impetus forces and impact parameters of windshield during bird impact
本文採用鳥撞實驗、有限元數值模擬與神經網路相結合的方法研究鳥撞飛機風擋過程中風擋的響應以及鳥撞實驗中撞擊力與撞擊參數的獲得。 -
In this study the dynamic response pf a circular arc windshield subjected to bird impact is carried out with experimental investigation and computer simulation in order to meet the need in designing new force aeroplanes
為了解決我國某型軍用飛機研製設計的急需，本文從實驗和計算機模擬兩方面系統地研究了鳥撞飛機圓弧風擋玻璃的動力響應問題。 -
The content includes the study on the fatigue performance of the plexiglas, the compiling of the load spectrum of the canopy, the study on the evaluation of the fatigue life of the canopy glass, the study on the allowable limit of the scratch on the canopy glass and the study on the analysis method of the dynamic response of the bird impact on the aircraft windshield
所涉及的內容包括:有機玻璃疲勞性能研究、活動艙蓋載荷譜編制、座艙玻璃疲勞壽命估算方法研究、座艙玻璃劃傷故障容限研究、飛機風擋鳥撞動響應分析方法研究等。根據活動艙蓋載荷特性，提出用壓力傳感器測量活動艙蓋載荷的方法，並首次實現了活動艙蓋載荷譜飛行測量。 -
The summary in the field of the research of the bird impact on engine blades and the basic contact caculation methods. according to these basic theories and methods, many numerical simulation of bird impact on flat blades are completed by ansys ls - dyna
本文介紹了鳥撞擊響應研究的基本理論與接觸計算方法，按照求解接觸沖擊問題的基本理論和方法，針對平板葉片的鳥撞擊問題，利用有限元分析軟體ansys ls - dyna進行大量的數值模擬計算。
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