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ANALYSIS ON ROTOR DYNAMICS 1 2 3 Excitation Mechanisms ODS can calculate the forced response for excitation mechanisms such as: Unbalance Rotating stall Rub and other parametric excitations Bearing pedestal movement or base excitation Simulation of subsynchronous centrifugal compressor vibrations caused by nonlinear bearing behaviour. Experience and Resources The ODS Machinery Dynamics Group has gained considerable experience, especially from our work in the oil and gas industry with a variety of high performance turbomachinery. ODS has in-house, state-of-the-art software for rotor dynamic and bearing dynamic calculations. This enables us to tailor-make the software to solve nontrivial problems. For example, statistical information on clearances can be related to stability margin, thereby allowing a cost-benefit analysis of recommended bearing modifications. ODS has also recognized commercial programs to predict fluid dynamic forces in seals and other clearances. ODS has well-established contacts with leading universities and laboratories around the world. This implies that we can assist in organizing both component testing and advanced research at the most qualified institutes.