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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.
• It’s important to get the excitation correct in the model.
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