Predicted Noise for a Main Rotor with Modulated Blade Spacing

Brentner, Kenneth S.; Edwards, Bryan; G, Riley R; Schillings, John

doi:10.4050/1.3092839

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2022

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Cited by 7 publications

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“…The noise of a helicopter with a four-bladed scissors rotor during flyovers was clearly lower than the helicopter with a conventional three bladed rotor [2]. Several researchers also investigated the noise performance of scissors rotors [3,4], and currently, scissors tail rotors are used in the AH-64, Mi-28 and Z-10 helicopters. Past research usually focused on the noise characteristics of scissors rotors.…”

Section: Introductionmentioning

confidence: 99%

Loads Transfer Principles of a Four-Bladed Scissors Rotor

Han

Barakos

2022

Journal of Aircraft

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Section: Introductionmentioning

confidence: 99%

Loads Transfer Principles of a Four-Bladed Scissors Rotor

Han

Barakos

2022

Journal of Aircraft

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Acoustics

Blotter

Sommerfeldt

Gee

2015

Mechanical Engineers' Handbook

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Acoustics is a very broad field of science that covers the generation, reduction, control, transmission, and reception aspects of sound. This chapter discusses three fundamental measures of sound. These are sound power, sound intensity, and sound pressure. In the field of acoustics, the decibel (dB), which is one‐tenth of a bel, is almost exclusively used. The first weighting filter to be discussed is called A weighting and usually carries the associated symbol dBA or dB(A). The chapter summarizes the fundamental theoretical developments of acoustics in a fluid. When a wave propagating in a medium encounters a change in the impedance presented to the wave, reflection and transmission of the wave occur. The chapter outlines some general concepts associated with the use of passive noise control for reducing unwanted noise and explains concepts associated with active noise control. Finally, hearing loss, community and environmental noise, and sound quality analysis, are presented.

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