Deformation analysis of a diaphragm type pressure sensor for automotive safety applications

Abstract

Monitoring pressure plays a vital role in automotive safety applications. This paper reports on the deformation analysis of a diaphragm type pressure sensor. There are two kinds of diaphragms, square type and circular type have been considered for the analysis. In this sense, diaphragms with equivalent cross sectional area have been selected for the simplicity. The proposed diaphragms has been simulated to get maximum deformation for an input pressure by using COMSOL and it is compared with the theoretical analysis. In addition, stress analysis along the mid line of the square type and circular type membranes also has been obtained by using FEM simulation. Based on the deformation, circular type diaphragm is preferable than square type. Even though, the design layout costs more in fabricating circular diaphragms which indeed increases the cost of the sensor and the fabrication costs are higher compared to the square shaped diaphragm.