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Flight Dynamics Investigation of Compound Helicopter Configurations

机译：复合直升机构型的飞行动力学研究

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摘要

Compounding has often been proposed as a method to increase the maximum speed of the helicopter. There are two common types of compounding known as wing and thrust compounding. Wing compounding offloads the rotor at high speeds, delaying the onset of retreating blade stall, and hence increasing the maximum achievable speed, whereas with thrust compounding, axial thrust provides additional propulsive force. There has been a resurgence of interest in the configuration due to the emergence of new requirements for speeds greater than those of conventional helicopters. The aim of this paper is to investigate the dynamic stability characteristics of compound helicopters and compare the results with a conventional helicopter. The paper discusses the modeling of two compound helicopters, which are named the coaxial compound and hybrid compound helicopters. Their respective trim results are contrasted with a conventional helicopter model. Furthermore, using a numerical differentiation technique, the dynamic stability of each configuration is assessed. The results show that the frequency of the coaxial compound helicopter's Dutch roll mode is less than that of the conventional helicopter, and there is greater roll damping. Concerning the hybrid compound helicopter, there is greater roll damping and the phugoid mode stabilizes at high speeds.
机译：通常已经提出将复合作为增加直升机最大速度的方法。有两种常见的复合类型，称为机翼和推力复合。机翼复合可以使转子高速卸载，从而延迟后退叶片失速的发生，从而增加最大可达到的速度，而采用推力复合时，轴向推力可提供额外的推进力。由于出现了对速度的要求比传统直升机更高的新要求，因此对该配置的兴趣重新出现。本文的目的是研究复合直升机的动态稳定性特征，并将结果与​​常规直升机进行比较。本文讨论了两种复合直升机的建模，即同轴复合直升机和混合复合直升机。它们各自的修剪结果与常规直升机模型形成对比。此外，使用数值微分技术评估每种配置的动态稳定性。结果表明，同轴复合直升机的荷兰侧倾模式的频率小于常规直升机，并且侧倾阻尼更大。关于混合式复合直升机，侧倾阻尼更大，并且斜面模式在高速下稳定。

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  • 来源
    《Journal of Aircraft》 |2015年第1期|156-167|共12页
  • 作者

    Kevin Ferguson; Douglas Thomson;

  • 作者单位

    University of Glasgow, Glasgow, Scotland G12 8QQ, United Kingdom;

    University of Glasgow, Glasgow, Scotland G12 8QQ, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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