2. How to Use OMA (Operational Modal Analysis) for Turbomachinery

Challenging applications within the high-performance centrifugal compressor industry, such as CO₂ reinjection turbo compressors on offshore platforms, have become increasingly common. These machines operate under high pressure, necessitating equipment manufacturers (OEMs) and users to develop more sophisticated manufacturing technologies and complex acceptance tests. The frontier of manufacturers’ knowledge has been pushed by high-density gasses, which introduce uncertainties in machine design, particularly regarding their rotodynamic stability. The number of end users requiring stability verification has grown, highlighting the subsidiary risk of increased unbalance sensitivity in this turbomachinery. This risk is referred to as Rotodynamic Design Uncertainties. Despite a single machine performing satisfactorily on its OEM test foundation, there remains a risk that it may fail to operate in an offshore plant. Recognizing this little-acknowledged reality, we are conducting research to address this design anomaly: Rotodynamic Design Uncertainties. We propose small modifications to the ADX vibration monitoring system, developed by LEDAV/COPPE/UFRJ, to enable a dataset project to be carried out at PETROBRAS/REFAP, followed by subsequent analysis of the results in the LEDAV environment using the ARTEMIS System.