Performance evaluation of a differential pressure cell model

This paper describes the development of a mathematical model of a different ial pressure cell and its application in MATLAB. The model is also examined in SIMULINK, for the purposes of comparison of the model with the real wor ld. Furthermore, we also describe the application of a system identificatio n method using a multifrequency binary test signal, for comparison with the mathematical model. The method is applied to a pneumatic differential pres sure cell. The exploration of the mathematical model shows that while the m ajority of the subsystems are nonlinear, they can adequately be approximate d by Taylor polynomials. This facilitates the modeling of the subsystem ele ments as linear agents. The identification results show that the cell, comp osed of three main components-the diaphragm, pilot relay flapper/nozzle, an d the feedback bellows-has an overall first-order linear response.