The possibility of guaranteeing significant fuel savings has undoubtedly contributed to the diffusion of advanced turboprop engines for the propulsion of passengers transport aircraft. An important drawback correlated to this choice is represented by the need of reducing the noise level in the aircraft cabin in order to improve the passengers comfort. Early studies have demonstrated that the main part of the interior noise in aircraft cabins originates from the airborne propeller noise which is transmitted through the fuselage structure and radiated into the cabin. Due to weight and space constraints the existing passive sound attenuation methods have shown to be effective only for alleviating the noise at relatively high frequencies. As a results, the low frequency interior sound control still represents a difficult objective to accomplish even for modern turboprop aircraft. In the last years a big effort has been spent to investigate the possibility of reducing the noise in the cabin by using alternative methodologies based on active noise control methods that may provide more efficient, lightweight and relatively cheap solutions. The active noise control techniques makes use of two different actuators typologies mainly. A first case, widely investigated in the literature, consists of concentrated acoustic waves generators (speakers) located inside the cabin, which produce a resultant acoustic field that may be reduced in some regions but may be highly increased in some other regions. A second case, more recent, consists of using piezoelectric actuators located on the bulkheads that are able to produce a more uniform acoustic field within the cabin. In this paper a procedure of optimal allocation of piezoelectric actuators is proposed that allows considerably reducing the noise in a predefined region of interest, by a suitably optimised control law.

Active noise optimal control for a turboprop aircraft

CELENTANO, GIOVANNI;IERVOLINO, RAFFAELE
2004

Abstract

The possibility of guaranteeing significant fuel savings has undoubtedly contributed to the diffusion of advanced turboprop engines for the propulsion of passengers transport aircraft. An important drawback correlated to this choice is represented by the need of reducing the noise level in the aircraft cabin in order to improve the passengers comfort. Early studies have demonstrated that the main part of the interior noise in aircraft cabins originates from the airborne propeller noise which is transmitted through the fuselage structure and radiated into the cabin. Due to weight and space constraints the existing passive sound attenuation methods have shown to be effective only for alleviating the noise at relatively high frequencies. As a results, the low frequency interior sound control still represents a difficult objective to accomplish even for modern turboprop aircraft. In the last years a big effort has been spent to investigate the possibility of reducing the noise in the cabin by using alternative methodologies based on active noise control methods that may provide more efficient, lightweight and relatively cheap solutions. The active noise control techniques makes use of two different actuators typologies mainly. A first case, widely investigated in the literature, consists of concentrated acoustic waves generators (speakers) located inside the cabin, which produce a resultant acoustic field that may be reduced in some regions but may be highly increased in some other regions. A second case, more recent, consists of using piezoelectric actuators located on the bulkheads that are able to produce a more uniform acoustic field within the cabin. In this paper a procedure of optimal allocation of piezoelectric actuators is proposed that allows considerably reducing the noise in a predefined region of interest, by a suitably optimised control law.
File in questo prodotto:
File Dimensione Formato  
paper.pdf

non disponibili

Tipologia: Documento in Pre-print
Licenza: Accesso privato/ristretto
Dimensione 5.15 MB
Formato Adobe PDF
5.15 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/201080
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact