Acoustic effects on binary aeroelasticity model
Acoustics is the science concerning the study of sound. The effects of sound on structures attract overwhelm interests and numerous studies were carried out in this particular area. Many of the preliminary investigations show that acoustic pressure produces significant influences on structures su...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Chulalongkorn University, Faculty of Engineering
2011
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| Subjects: | |
| Online Access: | http://eprints.usm.my/38241/ http://eprints.usm.my/38241/1/ACOUSTIC_EFFECTS_ON_BINARY_AEROELASTICITY_MODEL.pdf |
| Summary: | Acoustics is the science concerning the study of sound. The effects of
sound on structures attract overwhelm interests and numerous studies were carried out in
this particular area. Many of the preliminary investigations show that acoustic pressure
produces significant influences on structures such as thin plate, membrane and also highimpedance
medium like water (and other similar fluids). Thus, it is useful to investigate
structural response to acoustics on aircraft, especially on aircraft '"/ings, tails and control
surfaces which are vulnerable to flutter phenomena. The present paper describes the
modelling of structure-acoustic interaction to simulate the external acoustic effect on
binary flutter model. Here, the model is illustrated as a rectangular wing where the
aerodynamic wing model is constructed using strip theory \vith simplified unsteady
aerodynan1ics involving the terms for flap and pitch degree of freedom. The external
acoustic excitation, on the other hand, is modelled using a four-node quadrilateral
isoparametrlc element via finite element approach. Both equations are then carefully
coupled and solved using eigenvalue solution. Next the mentioned approach is
implemented in MATLAB and the outcome or the simulated results arc later described,
analyzed and illustrated. |
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