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ground effect (航空器接近地面飛行時升力增加的)地面效應。

ground effect machine

This method makes it possible for investigating the unsteady nonlinear potential flow in a complicated environment with higher efficiency . the aerodynamic forces of a wing in couple motion of heave and pitch with ground effect are analyzed in detail based on the numerical result . it is shown that a thrust force exists when the wing is in heave motion 深入系統地分析了存在表面效應時機翼運動規律和氣動力之間的關系,研究結果表明,機翼升沉運動產生的推力與升沉速度幅值的平方成比例,推力和推進效率和振蕩頻率成反比;機翼的俯仰運動可以調節推力和推進效率,但是單純的俯仰運動不會產生推力。

The target of this thesis is to develop a design and optimization tool for airfoils of wind - in - ground air vehicle . the functions of the tool include : to generate wing - in - ground air vehicle airfoil by relative less control points , to simulate the wing - in - ground effect by the mirror method , to analyze aerodynamic performance of the airfoil using the software javafoil and to optimization the airfoil by the based - surrogate optimization method 該軟件具有如下特點:給出較少的控制點生成一個地效飛行器翼型;采用鏡像法來模擬地面效應,應用可以計算地面效應的翼型分析軟件javafoil對地效飛行器翼型的空氣特性進行分析;應用基于代理模型的優化方法對地效飛行器翼型進行優化。

The character of tube roll mill is that it combines the advantages of ball mill and roller , then great improves the grinding efficiency through the study of the grinding theory of tube roll mill , pressing stress , grinding effect and the comparation between roller and vertical mill , this text combined the national important technology equipment crert item - - tube roll milling developing item , gets following results : firstly , because of the special structure of tube and roll , powder from single particle grinding in the early peried contincely transit press grinding stage , it better stops the loss of splash energy , secondly , during the grinding progress , powder form loose to dense fully uses the nonsmoth surface of particle and stress focus to make its stress lower than roller “ s 本文結合國家重大技術裝備國產化創新項目-筒式輥碾磨開發項目,通過對筒輥磨的粉磨機理、層壓應力的分析、粉磨效果的研究及與輥壓機、立磨粉磨效果、粉磨機理的比較,可知:首先,由于筒與輥的特殊結構方式,筒輥磨內粉體由初期的單顆粒破碎逐漸過渡到層壓粉碎階段,較好地防止了飛濺能的損失,其次,在粉磨過層中,粉體由疏松到密實,充分利用了顆粒的非光滑表面及應力集中效應使其應力低于輥壓機。實驗證實,筒輥磨的粉磨效果大大優于立磨和輥壓機。

Ask your cfi to take you to an airport where a long runway is available , preferably over 6000 ft . and to start a normal approach in normal configuration , descend to the normal round - out / flare hight , then keep the power or whatever power setting needed , so that you can fly the airplane , using ground effect . keep flying the runway center line for about 500 - 1000 feet 要求教官帶你去降長跑道( 6000尺以上) ,降至平飄高度后拉平,不減油門,也許在多給點油,利用地效沿跑道中線平飛500 - 1000尺,在這段時間內快速目測左,前,右,前,體驗此時飛機與跑道面的高度,然后收油門。

Within the field of ground effect , aerodynamic forces of the wing - in - surface effect crafts are not only decided by the angle of attack , but also by the flying height , and they lead to more complicated stability problems 在地效作用區域內,地效飛機的氣動力不僅與迎角有關,而且與飛行高度有關,因而其飛行穩定性問題更為復雜。

Lastly , pressing stress is related with enter angle , structural parameter , the progression and physical character of the poweder . the experiment verified tube roll mill “ s grinding effect prior vertical mill and roller 通過對筒輥磨層壓應力的分析可知:筒輥磨層壓應力與拉入角,結構參數,粉體級配物理性質有關。

With the ground effect , they own higher lift / drag ratio than general aircraft , so need less thrust power and have the ability to carry more loads or fly longer 在地效的作用下,它的升阻比比一般的飛機大,因而飛行時所消耗的推進功率小,具有更大的載重量或航程。

Abstract : wing - in - surface effect crafts belong to a class of transport vehicles , which make use of the ground effect to fly 文摘:地效飛機是一種主要利用地面效應提供支承力而飛行的運載工具。

Wing - in - surface effect crafts belong to a class of transport vehicles , which make use of the ground effect to fly 地效飛機是一種主要利用地面效應提供支承力而飛行的運載工具。

The ground effect increases the thrust force and efficiency 表面效應使機翼推力增大,推進效率提高。

Wing - in - ground vehicle , ground effect vehicle gev 翼地效應機

Trimming of helicopter with consideration of the ground effect 懸停時考慮地面效應的直升機的配平

Wing in ground effect vehicle and its transmission technology 地效翼船及其傳動技術