Impact of optimized variable rotor speed and active blade twist control on helicopter blade-vortex interaction noise and environmental impact

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dc.contributor.authorVouros, Stavros
dc.contributor.authorPolyzos, Nikolaos D.
dc.contributor.authorGoulos, Ioannis
dc.contributor.authorPachidis, Vassilios
dc.date.accessioned2021-05-21T10:23:11Z
dc.date.available2021-05-21T10:23:11Z
dc.date.issued2021-05-19
dc.description.abstractCombined variable rotor speed and active blade twist helicopter technologies have the potential to reduce the environmental and acoustic impact of modern rotorcraft. This paper explores the aeroacoustics, environmental and ground noise impact of combined variable rotor speed and active blade twist helicopter rotors, optimized for simultaneous mitigation of source noise and NOx" role="presentation" style="display: inline-block; line-height: normal; font-size: 16.2px; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border-width: 0px; border-style: initial; position: relative;" >x emissions. An integrated approach is employed including free-wake aeroelastic rotor modeling and time-domain aeroacoustic formulations fundamentally based on Acoustic Analogy. The overall method is incorporated into a multi-disciplinary design space exploration and surrogate-model-assisted optimization algorithm. The developed framework is deployed towards devising optimal variable rotor speed and active blade twist control for a representative twin-engine light helicopter operating in a realistic descent trajectory. The obtained rotor control schedules achieve overall ground noise reductions of up to 7 dB with concurrent NOx" role >x reductions of 11%, relative to the conventional rotor. The proposed approach provides new insight into rotor wake behavior and blade–vortex interactions, as well as environmental impact and ground noise footprint of combined variable rotor speed and active blade twist helicopter concepts.en_UK
dc.identifier.citationVouros S, Polyzos ND, Goulos I, Pachidis V. (2021) Impact of optimized variable rotor speed and active blade twist control on helicopter blade-vortex interaction noise and environmental impact. Journal of Fluids and Structures, Volume 104, July 2021, Article number 03285en_UK
dc.identifier.issn0889-9746
dc.identifier.urihttps://doi.org/10.1016/j.jfluidstructs.2021.103285
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16704
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectMulti-disciplinary optimizationen_UK
dc.subjectAeroacousticsen_UK
dc.subjectGround noise footprinten_UK
dc.subjectEnvironmental impacten_UK
dc.subjectBlade–vortex interactionsen_UK
dc.subjectHelicoptersen_UK
dc.titleImpact of optimized variable rotor speed and active blade twist control on helicopter blade-vortex interaction noise and environmental impacten_UK
dc.typeArticleen_UK

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