Investigation of the stable and unstable states of seismographs using poles and zeros pattern

Abstract

In this study, a simple Simulink model was designed and presented which can describe the overall operation of seismograph based on the desired input and output response.By converting Laplace to seismograph equations and by defining Numerator and Denominator fractions to Num. and Den. (Numerator and Denominator) transfer WWSSN (World-Wide Standard Seismographic Network) functions, the changeability of pole-zero was taken into consideration which indicates the stability and instability of the system layout with respect to pole - zero layout. In fact, the poles and zeros are placed in the seismograph response based on frequency, amplitude and phase (FAP) and are analyzed well. Through this method can also be used to study seismograph transfer function to predict the seismograph output in environments with different seismic noise and to select the most appropriate value for the parameters controlling the output of the device.