A study of rotorcraft noise prediction in maneuvering flight

Hsuan Nien Chen, Kenneth Steven Brentner, Leonard V. Lopes, Joseph Francis Horn

Research output: Contribution to conferencePaper

8 Citations (Scopus)

Abstract

The coupled flight simulation/noise prediction system (GENHEL-PSU-WOPWOP) has been partially validated for steady noise predictions in this paper. The noise predictions for a utility helicopter matched quite well with wind tunnel measurements of the isolated main rotor. The GENHEL-PSU-WOPWOP system is not capable of blade-vortex-interaction noise prediction, because GENHEL does not account for individual vortices. This limitation was mitigated in this work by choosing flight conditions that are not expected to be dominated by BVI noise. A flight simulation of a complex 80-second was performed. This maneuver, which included a climb, acceleration, 180° coordinated turn, and level flight, demonstrated the complexity of the radiated noise field during maneuvering flight. Care must be taken when interpreting the acoustic signal to account for changes in propagation distance, directivity changes due to aircraft attitude changes, and transient maneuver noise. In general maneuvering flight can be considered as a set of steady flight conditions connected by transient maneuvers. Transient maneuver noise, when present, may contribute dramatically to the radiated acoustic field. Transient maneuver noise is generated during short-duration maneuvers by a multiple sources: aperiodic rotor blade motions; aircraft attitude changes - especially rapid roll maneuvers; and unsteady transient aerodynamic loading on the rotor due to pilot control overshoots, and aerodynamic force overshoots. A more detailed understanding of transient maneuver noise was developed through a set of turn entry maneuvers of different durations.

Original languageEnglish (US)
Pages9549-9563
Number of pages15
StatePublished - Jul 1 2004
Event42nd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 5 2004Jan 8 2004

Other

Other42nd AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period1/5/041/8/04

Fingerprint

Rotors
Aerodynamics
Vortex flow
Aircraft
Acoustic fields
Acoustic noise
Helicopters
Turbomachine blades
Wind tunnels
Acoustics

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, H. N., Brentner, K. S., Lopes, L. V., & Horn, J. F. (2004). A study of rotorcraft noise prediction in maneuvering flight. 9549-9563. Paper presented at 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.
Chen, Hsuan Nien ; Brentner, Kenneth Steven ; Lopes, Leonard V. ; Horn, Joseph Francis. / A study of rotorcraft noise prediction in maneuvering flight. Paper presented at 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.15 p.
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Chen, HN, Brentner, KS, Lopes, LV & Horn, JF 2004, 'A study of rotorcraft noise prediction in maneuvering flight' Paper presented at 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States, 1/5/04 - 1/8/04, pp. 9549-9563.

A study of rotorcraft noise prediction in maneuvering flight. / Chen, Hsuan Nien; Brentner, Kenneth Steven; Lopes, Leonard V.; Horn, Joseph Francis.

2004. 9549-9563 Paper presented at 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.

Research output: Contribution to conferencePaper

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Chen HN, Brentner KS, Lopes LV, Horn JF. A study of rotorcraft noise prediction in maneuvering flight. 2004. Paper presented at 42nd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.