Abstract
In gas pressure regulators for natural gas distribution, unstable behaviors such as hunting could result in pressure anomalies. Therefore the quantitative evaluation of stability is very important. In conventional method, evaluation of the stability of regulator requires to develop mathematical model of all regulator elements. However, developing the mathematical model is not so easy because of variety of mechanical structure of regulator and it is feared that parameter measurement error and modeling approximations can be accumulated. In this study, we propose to apply a frequency response test to regulator. The devices for frequency response test has been developed and several test were performed to quantitatively evaluate the stability of regulators by the frequency response test. And the results confirmed the usefulness of applying the frequency response test to regulators.
