The Finite Element (FE) program
FEMP (Finite Element Modeling of Piezoelectric structures)
is a FE program for the modeling of piezoelectric transducers,
including the radiation into a fluid medium. The
piezoelectric part of the region of analysis is modeled
using piezoelectric finite elements,
the mechanical part of the region of analysis is modeled
using mechanical finite elements, and the
fluid part of the region of analysis is modeled
using a combination of fluid finite and fluid infinite elements.
The infinite elements are of Astley-Leis type (see E.g. Ref. ), also
called infinite wave envelope elements of variable order.
Finite Element Modeling of Piezoelectric structures
by Jan Kocbach
 R.J. Astley, J.A. Hamilton, and B.S. Wilkinson, ``Accuracy and conditioning
of infinite element schemes for exterior acoustics,'' in Proc. of 7th
International Congress on Sound and Vibration, edited by G. Guidati, H.
Hunt, H. Heller and A. Heiss (Kramer Technology Publishing, Munich, Germany,
2000), pp. 2171--2178.