Abstract
The aim of this work is to predict the acoustic pressure field produced by a seven-element foetal heartmonitoring transducer for a given sinusoidal voltage input. As each element is nominally identical, anaxisymmetric model of the single-element transducers is first produced. The orthotropic andpiezoelectric properties of the crystal are accounted for. The fluid loading is modelled using fluidfinite elements (FEs) together with a boundary element (BE). The latter enables the modelling of asemi-infinite region of fluid. A combined Helmholtz integral equation formulation with sixcollocation points is used to solve the BE problem. The acoustic field within the BE, may then bepredicted. Based on the assumption that the mechanical vibration of one element does not affect thatof the other, the complete acoustic field generated by the seven elements is obtained by superposition.Measurements show that the trends produced by this type of transducer are successfully predictedusing the FE/BE approach.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
