Parallel Blade-Vortex Interaction Modelling for Helicopter Rotor Noise Control Synthesis. Issue 7 (December 2014)

• Record Type: Journal Article
• Authors: Modini, Sara; Graziani, Giorgio; Bernardini, Giovanni; Gennaretti, Massimo
• Is Part Of: International journal of aeroacoustics. Volume 13:Issue 7/8(2014)
• Page Start: 587
• Page End: 606
• Publication Date: 2014-12
• Subjects: Aerodynamic noise -- Periodicals; Acoustical engineering -- Periodicals; Sound -- Periodicals; 629.1323
• DOI: 10.1260/1475-472X.13.7-8.587
• Languages: English
• ISSNs: 2048-4003

Abstract

The present work deals with a methodology for the alleviation of loads and corresponding emitted noise generated by blade-vortex interaction (BVI) phenomena occurring on helicopter main rotors in low-speed, descent flight. It consists of a multi-cyclic, optimal control approach driving higher harmonic blade pitch actuation. First, for the specific flight condition to be examined, the BVI phenomena are simulated as equivalent two-dimensional, multi-vortex, parallel BVI problems and then a local controller methodology is applied for the efficient identification of the closed-loop control algorithm. In order to assess the capability of the proposed control approach to alleviate rotor blade loads and emitted noise, the results of a numerical investigation concerning a realistic helicopter main rotor in descent flight are presented and discussed.