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Non-harmonic root-pitch individual-blade control for the reduction of blade-vortex interaction noise in rotorcraft.

机译:非谐波根音单个桨叶控制,用于降低旋翼飞机的桨叶-涡流相互作用噪声。

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摘要

One of the greatest obstacles to public acceptance of rotorcraft is the high levels of noise they produce, particularly in low-speed descent. In this flight condition, the trailing edge vortex of one blade often passes in close proximity to other blades resulting in impulsive changes in lift. This Blade-Vortex Interaction (BVI) creates high levels of both noise and vibration.;The objective of this dissertation is to evaluate the effectiveness of using physically motivated pulse-type Individual Blade Control for reducing the noise associated with the BVI. First, the major parameters that affect the severity of the interaction, such as vortex strength and blade-vortex miss-distance, are analyzed. Second, inputs designed specifically to alter the parameters previously identified as key are explored, resulting in elimination of advancing side noise and overall peak BVI Sound Pressure Level (BVISPL) reductions of up to 4.6 dB. Lastly, different feedback mechanisms for closed-loop control of IBC are examined to allow implementation of the developed inputs.
机译:旋翼飞机被公众接受的最大障碍之一是它们产生的高水平噪音,尤其是在低速下降时。在这种飞行状态下,一个叶片的后缘涡流经常靠近其他叶片,从而导致升力的脉冲变化。这种叶片-涡流相互作用(BVI)会产生高水平的噪声和振动。本论文的目的是评估使用物理脉冲型个体叶片控制来降低与BVI相关的噪声的有效性。首先,分析了影响相互作用严重程度的主要参数,例如涡旋强度和叶片涡旋错位距离。其次,探索了专门设计用来改变先前确定为关键参数的输入,从而消除了不断增加的侧噪声,并最大降低了BVI声压级(BVISPL)的总峰值,降低了4.6 dB。最后,研究了用于IBC闭环控制的不同反馈机制,以实现已开发输入的实现。

著录项

  • 作者

    Malovrh, Brendon D.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 234 p.
  • 总页数 234
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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