Engineering | Finite Element Analysis | Stress
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The excitation can be from acoustic sources, acoustic boundary conditions, and structural loads exerted on the structure.
Reverberant Field Analysis & Nearfield Acoustic Holography.
A reverberant field is a field where the sound level is nearly constant with a zero
intensity. A reverberant field analysis determines the effect of a constant sound
field with random phasing on a component. This analysis is usually takes the coupled
form, the structural vibration is influenced by the acoustic medium. In a reverberant
field analysis, the reverberant field pressure excites the acoustic medium around
the structure causing it to vibrate.
Nearfield Acoustic Holography, NAH, permits
one to take a snapshot of sound sources from a series of simple microphone measurements.
The analysis can integrate acoustic holography measurements and radiation analysis
to permit the complete simulation of the sound source and its environment.
Boundary Element Method
The boundary element method is frequently used to solve acoustics problems. Like
FEM, it is a numerical technique, but in BEM only the model boundaries are meshed.
The method automatically accounts for all space out to infinity; no "outer boundary"
of the problem is declared.
There are two solution approaches in BEM, direct & indirect.
The direct method is implemented by describing a zone of material, the solution is
only valid within the zone type. It solves for the difference in property across
the boundary and due to the fully populated symmetric matrices, a solution is relatively
easy to determine. The indirect method is mathematical in nature, and is solved using
a variational procedure. It is useful in situations where there is more than one
acoustic medium. However, the formulation of the problem leads to fully populated
non-symmetric matrices that are difficult to solve.
Acoustics - boundary element
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