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SUMMARY:**CANCELLED** Flow Induced Excitation of Elastic Modes - Dr Shreya
 s Mandre\, Harvard Unviversity
DTSTART:20080307T143000Z
DTEND:20080307T153000Z
UID:TALK10162@talks.cam.ac.uk
CONTACT:Julie Bazin
DESCRIPTION:Oscillations can arise spontaneously due to the interaction of
  a steady background flow and an elastic structure. Examples include flutt
 er of aircraft wings\, swaying of bridges\, speech generation in vocal cor
 ds and seismic oscillation excited by underground magma flows.\n\nIn the f
 irst part of the talk\, I describe a mechanism for the excitation of the e
 lastic modes of oscillation through a linear instability. These mode are b
 y definition decoupled from each other in vacuo\, but may interact with ea
 ch other owing to the surrounding fluid. The mechanism I will describe inv
 olves this interaction as the essential destabilizing agency.\n\nIn the se
 cond part of the talk\, I consider the modes of an acoustic cavity instead
  of an elastic body. An example of such a phenomena is the sound generated
  by blowing across a bottle\, which I will analyze from the perspective of
  a linear instability. The role of elasticity may be considered to be play
 ed by compressibility of air in the acoustic cavity. However\, the essenti
 al mechanism in this case involves the interaction between the blown jet a
 nd acoustic perturbations in the cavity.\n
LOCATION:Department of Engineering - LR6
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