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Method for the Extraction of Helicopter Main and Tail Rotor Noise

机译:直升机主,尾桨噪声的提取方法

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摘要

In this paper a method for the extraction of main and tail rotor noise from an acoustic pressure time history of a helicopter is described. The method is based on the classic Fourier series; however, modifications are made to account for nonperiodic and nonstationary data. Convergence of the method is demonstrated by the application of the method to artificial data. Thereafter the method is applied to wind tunnel data and flight test data for two different helicopters, one with a traditional tail rotor (Bo105) and one with a modern Fenestron (EC135). The results illustrate that a traditional tail rotor displays a rather tonal noise signature very similar to that of the main rotor, only smaller in amplitude and on a shorter time scale. The Fenestron displays a more chaotic noise signature with both a tonal and a broadband noise characteristic.
机译:本文描述了一种从直升机声压时间历程中提取主旋翼和尾旋翼噪声的方法。该方法基于经典的傅里叶级数;但是,进行了修改以解决非周期性和非平稳数据。通过将该方法应用于人工数据,证明了该方法的收敛性。此后,该方法适用于两架不同直升机的风洞数据和飞行测试数据,一架具有传统的尾桨(Bo105),另一架具有现代的Fenestron(EC135)。结果表明,传统的尾旋翼显示出与主旋翼非常相似的音调噪声特征,只是幅度较小且时间尺度较短。 Fenestron显示出更加混乱的噪声特征,同时具有音调和宽带噪声特征。

著录项

  • 来源
    《Journal of Aircraft》 |2018年第2期|805-816|共12页
  • 作者

    Olsman W. F. J.;

  • 作者单位

    German Aerosp Ctr, DLR, Inst Aerodynam & Flow Technol, Helicopter Dept, Lilienthalpl 7, D-38108 Braunschweig, Germany;

  • 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
  • 中图分类
  • 关键词

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