Recommended Practice for Pulsation and Vibration Control in Positive Displacement Machinery Systems for Petroleum, Petrochemical and Natural Gas Industry Services
Excitation Sources Fluid flow generated by positive displacement machinery is not steady. It is a series of flow pulses (dynamic or time varying) that are superimposed on the steady (average) flow. Example: Recip. Compressor Magnitude and shape of pulses through valve governed by physical characteristics of the compressor pulses act as excitations that create pressure and flow modulations (acoustic waves), which move through the process fluid as it moves through the piping system can typically be modeled as 1D waves. Its important to get the excitation correct in the model.