Simulation of the influence of tensometric pressure transducer diaphragm defects on its frequency response

Tensometric pressure transducer diaphragm defects are considered. Pressure transducer structure finite-element model was developed to analyze the influence of these defects on natural frequencies of the transducer. There are considered following defects: change in the size and shape of the diaphragm (thinning as a result of corrosion, plastic and residual deformation); sticking of foreign objects; change in modulus of elasticity. It was shown that mode shapes and frequencies changes take place in dependence of the defect type. Usual change in frequency is between 0,1 and 4 %. The results of the analysis may be used for method development of pressure transducer technical condition diagnosis.