We present a numerical investigation of the dynamic response of electroacoustic transducers caused by a swept sound wave. The transducer diaphragm consisted of a piezoelectric bimorph polymer film affixed to a circular Plexiglas frame. The finite element method was used to model the structure of coupled mechanical and electrical fields. Inclusion of incompatible modes allows high-order displacement effects to be characterized with fewer elements. By means of the Fourier transform technique, the relationship of swept-sine parameters and its spectrum span was obtained. The dynamic behavior of the designed transducer is accurately observed between 20 Hz and 20 kHz.