6533b862fe1ef96bd12c7638
RESEARCH PRODUCT
A study of noise transmission through cylindrical shell using modal truncation approach
Waleed Fekry FarisB. MartinAli El HafidiBeatrice Laysubject
EngineeringAircraft noiseSound transmission classNoise reductionAcousticssound transmissionShell (structure)[SPI]Engineering Sciences [physics]vehicle noisemodal truncationacousticsvibroacoustic behaviournoise reductioncylindrical shellsbusiness.industryMechanical EngineeringNumerical analysisAcoustic waveaerospaceNoiseaircraft fuselageFuselageaeroplane noiseairplane noiseAutomotive Engineeringautomotivebusinessnoise transmissiondescription
International audience; The study of the vibroacoustic behaviour of cylindrical structure like aircraft fuselage requires the establishment of very large models, and the numerical results which can be obtained are often difficult to interpret. On the other hand, the study of simple structures such as cylindrical shells is useful to validate the criteria and tools that can be used to simplify the models of complex structures. The presented study concerns the sound transmission through a cylindrical shell coupled to a cavity and subjected to an incident acoustic wave. Noise reduction is obtained and validated by a numerical method which uses structural and acoustical modes. A criterion for selecting eigen modes for the modal truncation is presented. Based on a principle of modal coupling, this criterion allows a judicious choice of modes that have an important influence on noise reduction. This criterion is used to reduce the length of acoustical and mechanical bases and to decrease time calculation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-01 |