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SUMMARY:JISFA4#2 - Overview of Onera acoustic active control activities in
  helicopter cabin
DTSTART;VALUE=DATE-TIME:20230712T122000Z
DTEND;VALUE=DATE-TIME:20230712T124000Z
DTSTAMP;VALUE=DATE-TIME:20260308T104424Z
UID:indico-contribution-739@events.isae-supaero.fr
DESCRIPTION:Speakers: Frank Simon (DMPE - ONERA - Université de Toulouse)
 \nWithin a helicopter cabin\, passengers are in close proximity to disturb
 ing sources that contribute to interior noise: main and tail rotors\, engi
 nes\, main gearbox and aerodynamic turbulence. These sources generate bend
 ing vibrations of the entire tail boom\, induced vibrations in the cabin a
 t blade passing frequencies\, transient vibrations of rotor blades and str
 ucture borne noise induced by gear meshing within gearboxes. Conventional 
 passive systems\, as trim panels or passive anti-resonance isolation syste
 ms\, are still the main way to control the cabin noise. Nevertheless\, (se
 mi-)active control techniques have been the subject of numerous studies fo
 r decades\, especially to improve the performance of passive concepts in l
 ow frequencies. Unfortunately\, many turned out to be unreliable or comple
 tely inapplicable because problems of robustness\, time convergence of alg
 orithms\, but also a difficult identification of optimal locations for act
 uators and sensors or a high added mass and electrical power. The objectiv
 es of this paper is to describe in details the research projects in active
  noise control carried out at Onera since the 1990s\, i.e. from numerical 
 modeling and laboratory tests to flight tests in helicopter cabin. This ov
 erview will feed into the reflection on the renewal of active vibro-acoust
 ic control within different laboratories.\n\nhttps://events.isae.fr/event/
 22/contributions/739/
LOCATION:Toulouse
URL:https://events.isae.fr/event/22/contributions/739/
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