Design of Pressure Measuring Cells Using the Unified Material Law

P. Aguirre[1], F. Figueroa[1]
[1]Sensor Technik Wiedemann GmbH, Kaufbeuren, Bayern, Germany

Pressure Sensors are widely used in the automotive industry. Their main use is the dynamic monitoring of pressure inside combustion engines. To achieve a good signal accuracy, the design of pressure sensors can be improved with FEM calculations of stress and strains on the measuring cell depending on their geometry and material properties.

The geometry is adapted according to a special nominal pressure and a limit rule of the stresses. The non-linearity can be calculated conforming a use of strain-gages over the membrane surface.

The design with FEM tools allows us to analyze tolerances in the geometry, their effects on the signal and mechanical stability of the sensor.