Structural vs. Acustic Piezoelctric Loupspeaker Optimization

Here comes my own talk from WCSMO-8. It deals with the topology optimization of a piezoelectric loudspeaker. I consider the full coupling with acoustics and a pure structural approximation. Both cases are compared and it turns out, that for my model, the structural approximation does not hold for most cases as the objective function favours vibrational patterns that actually lead to acoustic short circuits. What I do is actually to load the final topologies from the structural optimization and evaluate the sound power with a fully coupled simulation.

This might also be the first publication about a fully piezoelectric-mechanical-acoustic coupled loudspeaker. The interesting thing is that the structural eigenmodes both cannot be excited by a full piezoelectric patch and also would result in acoustic short circuits.

For a weakly coupled form, using boundary elements, Nils Olhoff and Jianbin Du presented "Minimization of Sound Pressure in the Acoustic Field Generated by Vibrating Structures Using Topology Optimization" (#1396).

You can have a look to my talk (download talk)

Topology Optimization of a Piezoelectric Loudspeaker Coupled with the Acoustic Domain

View more Microsoft Word documents from fwein.

and download the conference proceedings paper. The title is "Topology Optimization of a Piezoelectric Loudspeaker Coupled with the Acoustic Domain" (#1230) by Fabian Wein, Manfred Kaltenbacher, Fabian Schury, Eberhard Baensch and Guenter Leugering.