The dynamics and sensitivity analysis of a plunger-type pressure control valve.

Abstract

This paper is concerned with an analytical study of the dynamics of a plunger-type pneumatic pressure control valve, already proposed by the authors, which maintains a constant secondary pressure lower than the primary pres­ sure, in spite of the change of the primary pressure or the fluctuation of the load connected with this valve. At first, the dynamics of the secondary pressure and the plunger movement, caused by changes of the primary pres­ sure and the load, is analyzed by means of the state vari­ able method. Furthermore, for improvement of responsibi­ lity, the conditions for adjusting system parameters are found through the root locus method. Next, the sensitivi­ ty analysis is applied to the investigation of the influ­ ences of parameter variations on the dynamics of the con­ trol valve. By means of simulation studies of sensitivity functions, we have shown which parameters are really sig­ nificant and also which are not. Throughout these analy­ tical and simulation studies, guidelines for improving the performance of a plunger-type pressure control valve are obtained.