Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction

Carlos Malpica, Eric Greenwood, Ben W. Sim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

An acoustics parametric analysis of the effect of fuselage drag and pitching moment on the Blade-Vortex Interaction (BVI) noise radiated by a medium lift helicopter (S-70/UH-60) in a descending flight condition was conducted. The comprehensive analysis CAMRAD II was used for the calculation of vehicle trim, wake geometry and integrated air loads on the blade. The acoustics prediction code PSU-WOPWOP was used for calculating acoustic pressure signatures for a hemispherical grid centered at the hub. This paper revisits the concept of the X-force controller for BVI noise reduction, and investigates its effectiveness on an S-70 helicopter. The analysis showed that further BVI noise reductions were achievable by controlling the fuselage pitching moment. Reductions in excess of 6 dB of the peak BVI noise radiated towards the ground were demonstrated by compounding the effect of airframe drag and pitching moment simultaneously.

Original languageEnglish (US)
Title of host publicationAmerican Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016
PublisherAmerican Helicopter Society International
Pages485-493
Number of pages9
ISBN (Electronic)9781510828872
StatePublished - Jan 1 2016
EventAHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016 - San Francisco, United States
Duration: Jan 20 2016Jan 22 2016

Publication series

NameAmerican Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016

Other

OtherAHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016
CountryUnited States
CitySan Francisco
Period1/20/161/22/16

Fingerprint

Noise abatement
Helicopters
Vortex flow
Fuselages
Acoustics
Drag
Airframes
Controllers
Geometry
Air

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Aerospace Engineering
  • Mechanical Engineering
  • Control and Systems Engineering

Cite this

Malpica, C., Greenwood, E., & Sim, B. W. (2016). Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction. In American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016 (pp. 485-493). (American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016). American Helicopter Society International.
Malpica, Carlos ; Greenwood, Eric ; Sim, Ben W. / Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction. American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016. American Helicopter Society International, 2016. pp. 485-493 (American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016).
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abstract = "An acoustics parametric analysis of the effect of fuselage drag and pitching moment on the Blade-Vortex Interaction (BVI) noise radiated by a medium lift helicopter (S-70/UH-60) in a descending flight condition was conducted. The comprehensive analysis CAMRAD II was used for the calculation of vehicle trim, wake geometry and integrated air loads on the blade. The acoustics prediction code PSU-WOPWOP was used for calculating acoustic pressure signatures for a hemispherical grid centered at the hub. This paper revisits the concept of the X-force controller for BVI noise reduction, and investigates its effectiveness on an S-70 helicopter. The analysis showed that further BVI noise reductions were achievable by controlling the fuselage pitching moment. Reductions in excess of 6 dB of the peak BVI noise radiated towards the ground were demonstrated by compounding the effect of airframe drag and pitching moment simultaneously.",
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Malpica, C, Greenwood, E & Sim, BW 2016, Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction. in American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016. American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016, American Helicopter Society International, pp. 485-493, AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016, San Francisco, United States, 1/20/16.

Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction. / Malpica, Carlos; Greenwood, Eric; Sim, Ben W.

American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016. American Helicopter Society International, 2016. p. 485-493 (American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Malpica C, Greenwood E, Sim BW. Helicopter non-unique trim strategies for blade-vortex interaction (BVI) noise reduction. In American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016. American Helicopter Society International. 2016. p. 485-493. (American Helicopter Society International - AHS Specialists' Conference on Aeromechanics Design for Vertical Lift 2016).