Numerical modelling is of considerable importance for the design, improvement and study of acoustic transducers such as microphones and accelerometers. Techniques like the Boundary Element Method (BEM) and Finite Element Method (FEM) are the most common supplements to the traditional empirical and analytical approaches. However, there are several difficulties to be addressed that are derived from the size, internal structure and precision requirements that are characteristic of these devices. One of them, the presence of very close surfaces (e. g. the microphone diaphragm and back-electrode) leads to machine precision errors and instabilities in the computation of numerical solutions. An investigation is carried out to deal with this so-called narrow-gap problem. The paper presents the subject and proposes a practical solution.
|Title of host publication||Proceedings of Sixth International Congress on Sound and Vibration : http://www.iiav.org/|
|Number of pages||8|
|Publisher||International Institute of Acoustics and Vibration|
|Publication status||Published - 1999|