ON THE FLUTTER SPEED OF A ROTOR BLADE IN FORWARD FLIGHT

机译：向前旋转叶片的颤振速度

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Presented is a theoretical method for determining rotor blade flutter in forward flight and a sample problem that considers coupled bending torsion flutter of a modified UH-60 rotor blade. The theory accounts for the unsteady aerodynamic contribution of the wake below the rotor. This is made possible due to certain simplifying assumptions regarding the rotor's wake. In particular, it is assumed at the onset of flutter that oscillations begin to build up prior to the blade reaching a critical azimuth position, then decay as the blade moves beyond this point. Using the new forward flight lift deficiency function, the authors set up and repeatedly solve the flutter determinant for the blade in the conventional manner (Ref 7) to obtain the blade's flutter speed. For the sample analysis the UH-60 rotor blade is modified to make it "flutter susceptible". This is achieved by moving the chordwise position of the blade's center-of-gravity aft of the quarter chord while keeping its elastic axis at the quarter chord.

机译：提出了一种用于确定前向飞行中的转子叶片颤振的理论方法，以及一个样本问题，该问题考虑了改进的UH-60转子叶片的耦合弯曲扭振颤振。该理论解释了转子下方尾流的非稳态空气动力学贡献。由于有关转子尾流的某些简化假设，使之成为可能。特别地，假设在颤动开始时，在叶片到达临界方位角位置之前就开始产生振荡，然后随着叶片移动超过该点而衰减。使用新的前向飞行升力不足功能，作者以常规方式设置并反复求解叶片的颤振决定因素（参考文献7），以获得叶片的颤振速度。为了进行样品分析，对UH-60转子叶片进行了修改，使其“易于颤动”。这是通过在四分之一弦的后部移动叶片重心的弦向位置，同时将其弹性轴保持在四分之一弦上来实现的。

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《28th European Rotorcraft Forum》|2002年|p.43.1-43.12|共12页
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E. R. Wood; M. A. Couch; D. Canright;
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中图分类航空;
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专利

1. 水平轴风力机叶片经典颤振速度参数敏感性分析 [J] . 高强, 蔡新, 郭兴文, 中南大学学报（英文版） . 2018,第007期
2. Optimization for rotor blade-tip planform with low high-speed impulsive noise characteristics in forward flight [J] . Zhu Zheng, Zhao Qi-jun Proceedings of the Institution of Mechanical Engineers . 2017,第G7期

机译：前向飞行中具有低高速脉冲噪声特性的桨叶尖端平台的优化
3. Whirl Flutter Stability of Two-Bladed Proprotor/Pylon Systems in High Speed Flight [J] . Beerinder Singh, Inderjit Chopra Journal of the American Helicopter Society . 2003,第2期

机译：高速飞行中两叶Proprotor / Pylon系统的旋涡颤动稳定性
4. Improving aeroelastic characteristics of helicopter rotor blades in forward flight [J] . Hossam T. Badran, Mohammad Tawfik, Hani M. Negm Advances in Aircraft and Spacecraft Science . 2019,第1期

机译：在向前飞行中改善直升机旋翼桨叶的气动弹性特性
5. ON THE FLUTTER SPEED OF A ROTOR BLADE IN FORWARD FLIGHT [C] . E. R. Wood, M. A. Couch, D. Canright European Rotorcraft Forum . 2002

机译：在向前飞行中转子叶片的颤动速度
6. UNSTEADY AERODYNAMICS IN TIME AND FREQUENCY DOMAINS FOR FINITE-TIME ARBITRARY MOTION OF HELICOPTER ROTOR BLADES IN HOVER AND FORWARD FLIGHT (AEROELASTICITY, NONLINEAR PERIODIC SYSTEMS, CASCADE AERO, MODELING, RATIONAL APPROXIMATIONS). [D] . ASGHAR-HESSARI-DINYAVARI, MEHRAN. 1985

机译：悬停和向前飞行中直升机转子叶片有限时任意运动的时间和频率域非定常气动特性（气动弹性，非线性周期系统，级联气动，建模，有理近似）。
7. Development of a centrifugal separator for grape marc: effect of the blade position and rotor speed on grape seed separation performance [O] . Roberto Romaniello, Antonia Tamborrino, Alessandro Leone 2019

机译：葡萄渣离心分离机的开发：叶片位置和转子转速对葡萄籽分离性能的影响
8. Part I: A second approximation to the induced drag of a helicopter rotor in forward flight. Part II: The instantaneous induced velocity at the blade of a finite-bladed rotor in forward flight [O] . Prouty Raymond W. 1958

机译：第一部分：直升机旋翼在向前飞行中诱导阻力的第二个近似值。第二部分：前飞中有限叶片转子叶片的瞬时诱导速度
9. THE EFFECT OF CONTROL STIFFNESS AND FORWARD SPEED ON THE FLUTTER OF A 1/10-SCALE DYNAMIC MODEL OF A TWO-BLADE JET-DRIVEN HELICOPTER ROTOR [R] . George W. Brooks, Maurice A. Sylvester 1955

机译：控制刚度和前进速度对双叶射流直升机转子1/10比例动态模型颤振的影响

ON THE FLUTTER SPEED OF A ROTOR BLADE IN FORWARD FLIGHT

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