Performance and Loads of a Lift Offset Rotor, Part II: Prediction Validations with Measurements

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE

Journal of the American Helicopter Society Pub Date : 2021-01-01 DOI:10.4050/jahs.67.012004

J. Schmaus, I. Chopra

引用次数: 0

Abstract

The predictions of an upgraded UMARC comprehensive analysis are compared to experimental lift offset rotor results. The experiments cover a range of collective pitch angles (θ°) from 2° to 10°, advance ratios (μ) from 0.21 to 0.53, and lift offset from 0% to 20%. The experimental model rotors are from a system of coaxial hingeless rotors, with two blades each, and a first flap frequency of approximately 1.6/rev. The simulation is compared with isolated rotor performance and controls with lift offset, loads, and pitch link forces. Increasing efficiency with increasing lift offset, the impact of lift offset on different loads, and the dependence of pitch link loads on pitch bearing damping are identified in the experiment and correlated with the simulation.

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升力偏置转子的性能和载荷，第二部分:测量的预测验证

将升级后的UMARC综合分析预测结果与升力偏置转子实验结果进行了比较。实验范围为总俯仰角(θ°)为2°~ 10°，超前比(μ)为0.21 ~ 0.53，升力偏移为0% ~ 20%。实验模型转子来自一个同轴无铰转子系统，每个转子有两个叶片，第一次襟翼频率约为1.6/rev。仿真比较了孤立转子性能和控制升力偏移、载荷和俯仰连杆力。在实验中发现了随着升力偏置的增加而提高效率、升力偏置对不同载荷的影响以及节距连杆载荷对节距轴承阻尼的依赖关系，并与仿真相关联。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Helicopter Society 工程技术-工程：宇航

CiteScore

4.10

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of the American Helicopter Society is a peer-reviewed technical journal published quarterly (January, April, July and October) by AHS — The Vertical Flight Society. It is the world''s only scientific journal dedicated to vertical flight technology and is available in print and online. The Journal publishes original technical papers dealing with theory and practice of vertical flight. The Journal seeks to foster the exchange of significant new ideas and information about helicopters and V/STOL aircraft. The scope of the Journal covers the full range of research, analysis, design, manufacturing, test, operations, and support. A constantly growing list of specialty areas is included within that scope. These range from the classical specialties like aerodynamic, dynamics and structures to more recent priorities such as acoustics, materials and signature reduction and to operational issues such as design criteria, safety and reliability. (Note: semi- and nontechnical articles of more general interest reporting current events or experiences should be sent to the VFS magazine