前飞的英文

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1. 3 . we put forward a combine algorithm for predicting the aerodynamically generated noise using different methods mentioned above , and developed a computer code named " nospre " to predict acoustic noise generated by rotors 4
   Nospre集成了三种噪声预测方法，可采用固定或旋转的声源面来预测跨音速旋翼悬停和前飞时的气动噪声。
2. In chapter 5 , the helicopter as350b2 rotor are taken as numerical examples in order to validate the model developed in chapter 4 . finally , chapter 6 summarizes the current research , some advices for future research on this subject is given
   应用该模型,第五章以法国宇航公司生产的as350b2 “小松鼠”直升机为算例,计算了前飞状态下孤立尾桨的旋转噪声,验证了计算模型和计算方法的正确性。
3. In this thesis , the major contributions of the author ’ s research work are as follows : at first , the classification of helicopter tail rotor noise sources and the existent method of helicopter noise research is introduced briefly
   本文采用谐波分析法对直升机前飞状态下的尾桨噪声进行了理论分析研究。主要工作包括:本文首先简要介绍了直升机噪声的分类以及国内外直升机噪声研究方法的现状,总结了前人的研究成果。
4. The down wash flow has been mainly studied in its forming and its model , and also the its distribute is given under terms with helicopter hang and park or low - speed flying , for offering the basis of next research on the down wash flow ' s influence of the guided missile launching
   主要对下洗流的形成和模型进行了研究，并给出了在直升机悬停和低速前飞条件下的下洗流分布，为下一步研究导弹发射受下洗影响提供了依据。
5. But the variation of its aerodynamic forces will induce flapping motion and produce the cyclic pitch on the main rotor blades by the bell mixing mechanism . in order to study the effect of bell - hiller stabilizer bar on helicopter stability and control , this paper first analyze the function and the principles , give the flapping equation and a flight dynamic model with bell - hiller stabilizer bar . and then works over the stability and control of uav r - 50 in hover and cruise condition , and analyzed the influence from parameters of the bar to it
   为了深入研究希勒伺服旋翼对直升机稳定性和操纵性的影响,本文首先分析了希勒伺服旋翼的功能和工作原理,推导了伺服旋翼的挥舞运动方程,建立了带有希勒伺服旋翼直升机的飞行动力学模型,然后以yamahar - 50无人直升机为例,分析该直升机在悬停和前飞时的平衡、稳定性和操纵性,在此基础上进一步研究希勒伺服旋翼设计参数变化对直升机稳定性和操纵性的影响。