庭院的高墙和较高的温度导致这架黑鹰在其自身的旋翼洗流中下坠。旋翼洗流是一种“具有动力的下坠”，这是种很危险的空气动力学状态。
The high walls of the compound and the warm temperatures had caused the Black Hawk to descend inside its own rotor wash-a hazardous aerodynamic situation known as "settling with power."
文章详细地介绍了从飞行力学的角度来确定直升机平直飞行时的旋翼功率传递系数。
In this paper, the rotor power transfer coefficient is determined from the point of helicopter flight dynamics.
以动力学模型和气动模型相匹配为原则，建立了后掠桨尖旋翼的细致气弹模型。
A refined aeroelastic model of a helicopter rotor blade with swept tips is established based on model matching.
研究表明，本方法适用于转子动力学，直升机旋翼-机身耦合系统以及具有流体流动的管道系统的动力分析。
Research shows that, it is suitable for rotor dynamics, dynamic analysis of helicopter rotor blades fuselage systems and piping systems contained flow fluid.
该旋翼使飞行方向，在垂直起降和向前飞行，利用空气动力学。
The rotor wing gives flight direction during VTOL and forward flight, using aerodynamics.
仿生学和空气动力学研究均表明，对于特征尺寸相当于鸟类或者昆虫的微型飞行器来说，扑翼飞行器要优于固定翼和旋翼飞行器。
Research on bionics and aerodynamics indicates that flapping mode is better than rotorcraft and fixed-wing mode when they are about the size of small birds.
该旋翼产生的电梯在垂直起降，利用空气动力学。
The rotor wing produces lift during VTOL, using aerodynamics.
在考察非均匀诱速分布、入流动力学和非定常翼型性能的基础上，建立了一种模拟非定常旋翼气动力的新方法。
A new approach to modeling the unsteady rotor aerodynamic forces is established based on the insight into the nonuniform induced velocity distribution, inflow dynamics and unsteady airfoil behavior.
复合材料桨叶剖面特性是旋翼桨叶设计的最基本原始参数，也是桨叶结构设计、动力学设计和结构分析的基础。
The design of structure and dynamics of a rotor blade is based on its section characteristic of composite blade.
以此为基础，建立了电控旋翼直升机的飞行动力学模型。
Then the flight dynamics model of the ECR helicopter was constructed.
旋翼干扰空气动力学问题一直是旋翼飞行器空气动力学的研究热点和难点之一。
Research on the aerodynamic interaction between the rotors and components of rotorcraft have been a very important aspect and a very challenging subject in rotorcraft Aerodynamics.
深入探讨了单旋翼涵道风扇式无人直升机的动力学原理，结合其全量方程和线性化增量方程，推导出了其钟摆模态的数学表示。
Then the equation of helicopter pendulum is derived from the nonlinear differential equation and linear differential equation, with the principle of helicopter aerodynamics.
文中根据四旋翼垂直起降机的动力学和运动学原理对其建立非线性模型和线性模型。
In the paper, according to the dynamics and kinematics principle of the four-rotor VTOL aircraft, non-linear and linear models were established.
在本文中作者考虑了各种因素，推导出铰接式刚性旋翼的动力学广义方程。这些因素是：诱导速度的二阶谐量与挥午系数的二阶谐量；
In this paper, the general dynamic equations of the hinged stiff rotor blades are derived for a lot of factors, such as the second-harmonic of induced velocity;
在本文中作者考虑了各种因素，推导出铰接式刚性旋翼的动力学广义方程。这些因素是：诱导速度的二阶谐量与挥午系数的二阶谐量；
In this paper, the general dynamic equations of the hinged stiff rotor blades are derived for a lot of factors, such as the second-harmonic of induced velocity;
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