Report
Project 006: Rotorcraft Noise Abatement Operating Conditions Modeling
Washington State University
2021
DOI:
https://doi.org/10.7273/000001737
Handle:
https://hdl.handle.net/2376/120113
Appears in Aviation Sustainability Center (ASCENT)
Abstract
Rotorcraft noise consists of several components including rotor noise, engine noise, gearbox and transmission noise, etc. Rotor noise is typically the dominant component of rotorcraft noise that is heard by the community upon takeoff, landing, and along the flight path of the helicopter. Rotor noise is comprised of several different noise sources including thickness noise and loading noise (together typically referred to as rotational noise), blade-vortex-interaction (BVI) noise, high-speed impulsive (HSI) noise, and broadband noise – with each noise source having its own unique directivity pattern around the helicopter. Furthermore, any aerodynamic interaction between rotors, interaction of the airframe wake and a rotor, or unsteady, time-dependent loading generated during maneuvers typically results in significant increases in loading noise. The combination of all the potential rotor noise sources makes prediction of rotorcraft noise quite complex, even though not all of the noise sources are present at any given time in the flight (e.g., BVI noise usually occurs during descent and HSI noise only occurs in high-speed forward flight).
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Details
- Title
- Project 006: Rotorcraft Noise Abatement Operating Conditions Modeling
- Creators
- Kenneth S. Brentner (Author) - Pennsylvania State University
- Academic Unit
- Aviation Sustainability Center (ASCENT); Emissions
- Publisher
- Washington State University
- Grants
- 13-C-AJFE-PSU-006, Federal Aviation Administration (United States, Washington) - FAA
- Identifiers
- 99900623187101842
- Language
- English
- Resource Type
- Report